Fix: CmdSetAutoReplace didn't validate group type and engine type match (#9950)

[openttd-github.git] / src / vehicle_gui.cpp

/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */

/** @file vehicle_gui.cpp The base GUI for all vehicles. */

#include "stdafx.h"
#include "debug.h"
#include "company_func.h"
#include "gui.h"
#include "textbuf_gui.h"
#include "command_func.h"
#include "vehicle_gui_base.h"
#include "viewport_func.h"
#include "newgrf_text.h"
#include "newgrf_debug.h"
#include "roadveh.h"
#include "train.h"
#include "aircraft.h"
#include "depot_map.h"
#include "group_gui.h"
#include "strings_func.h"
#include "vehicle_func.h"
#include "autoreplace_gui.h"
#include "string_func.h"
#include "widgets/dropdown_func.h"
#include "timetable.h"
#include "articulated_vehicles.h"
#include "spritecache.h"
#include "core/geometry_func.hpp"
#include "company_base.h"
#include "engine_func.h"
#include "station_base.h"
#include "tilehighlight_func.h"
#include "zoom_func.h"
#include "depot_cmd.h"
#include "vehicle_cmd.h"
#include "order_cmd.h"
#include "roadveh_cmd.h"
#include "train_cmd.h"

#include "safeguards.h"


BaseVehicleListWindow::GroupBy _grouping[VLT_END][VEH_COMPANY_END];
Sorting _sorting[BaseVehicleListWindow::GB_END];

static BaseVehicleListWindow::VehicleIndividualSortFunction VehicleNumberSorter;
static BaseVehicleListWindow::VehicleIndividualSortFunction VehicleNameSorter;
static BaseVehicleListWindow::VehicleIndividualSortFunction VehicleAgeSorter;
static BaseVehicleListWindow::VehicleIndividualSortFunction VehicleProfitThisYearSorter;
static BaseVehicleListWindow::VehicleIndividualSortFunction VehicleProfitLastYearSorter;
static BaseVehicleListWindow::VehicleIndividualSortFunction VehicleCargoSorter;
static BaseVehicleListWindow::VehicleIndividualSortFunction VehicleReliabilitySorter;
static BaseVehicleListWindow::VehicleIndividualSortFunction VehicleMaxSpeedSorter;
static BaseVehicleListWindow::VehicleIndividualSortFunction VehicleModelSorter;
static BaseVehicleListWindow::VehicleIndividualSortFunction VehicleValueSorter;
static BaseVehicleListWindow::VehicleIndividualSortFunction VehicleLengthSorter;
static BaseVehicleListWindow::VehicleIndividualSortFunction VehicleTimeToLiveSorter;
static BaseVehicleListWindow::VehicleIndividualSortFunction VehicleTimetableDelaySorter;
static BaseVehicleListWindow::VehicleGroupSortFunction VehicleGroupLengthSorter;
static BaseVehicleListWindow::VehicleGroupSortFunction VehicleGroupTotalProfitThisYearSorter;
static BaseVehicleListWindow::VehicleGroupSortFunction VehicleGroupTotalProfitLastYearSorter;
static BaseVehicleListWindow::VehicleGroupSortFunction VehicleGroupAverageProfitThisYearSorter;
static BaseVehicleListWindow::VehicleGroupSortFunction VehicleGroupAverageProfitLastYearSorter;

/** Wrapper to convert a VehicleIndividualSortFunction to a VehicleGroupSortFunction */
template <BaseVehicleListWindow::VehicleIndividualSortFunction func>
static bool VehicleIndividualToGroupSorterWrapper(GUIVehicleGroup const &a, GUIVehicleGroup const &b)
{
        return func(*(a.vehicles_begin), *(b.vehicles_begin));
}

BaseVehicleListWindow::VehicleGroupSortFunction * const BaseVehicleListWindow::vehicle_group_none_sorter_funcs[] = {
        &VehicleIndividualToGroupSorterWrapper<VehicleNumberSorter>,
        &VehicleIndividualToGroupSorterWrapper<VehicleNameSorter>,
        &VehicleIndividualToGroupSorterWrapper<VehicleAgeSorter>,
        &VehicleIndividualToGroupSorterWrapper<VehicleProfitThisYearSorter>,
        &VehicleIndividualToGroupSorterWrapper<VehicleProfitLastYearSorter>,
        &VehicleIndividualToGroupSorterWrapper<VehicleCargoSorter>,
        &VehicleIndividualToGroupSorterWrapper<VehicleReliabilitySorter>,
        &VehicleIndividualToGroupSorterWrapper<VehicleMaxSpeedSorter>,
        &VehicleIndividualToGroupSorterWrapper<VehicleModelSorter>,
        &VehicleIndividualToGroupSorterWrapper<VehicleValueSorter>,
        &VehicleIndividualToGroupSorterWrapper<VehicleLengthSorter>,
        &VehicleIndividualToGroupSorterWrapper<VehicleTimeToLiveSorter>,
        &VehicleIndividualToGroupSorterWrapper<VehicleTimetableDelaySorter>,
};

const StringID BaseVehicleListWindow::vehicle_group_none_sorter_names[] = {
        STR_SORT_BY_NUMBER,
        STR_SORT_BY_NAME,
        STR_SORT_BY_AGE,
        STR_SORT_BY_PROFIT_THIS_YEAR,
        STR_SORT_BY_PROFIT_LAST_YEAR,
        STR_SORT_BY_TOTAL_CAPACITY_PER_CARGOTYPE,
        STR_SORT_BY_RELIABILITY,
        STR_SORT_BY_MAX_SPEED,
        STR_SORT_BY_MODEL,
        STR_SORT_BY_VALUE,
        STR_SORT_BY_LENGTH,
        STR_SORT_BY_LIFE_TIME,
        STR_SORT_BY_TIMETABLE_DELAY,
        INVALID_STRING_ID
};

BaseVehicleListWindow::VehicleGroupSortFunction * const BaseVehicleListWindow::vehicle_group_shared_orders_sorter_funcs[] = {
        &VehicleGroupLengthSorter,
        &VehicleGroupTotalProfitThisYearSorter,
        &VehicleGroupTotalProfitLastYearSorter,
        &VehicleGroupAverageProfitThisYearSorter,
        &VehicleGroupAverageProfitLastYearSorter,
};

const StringID BaseVehicleListWindow::vehicle_group_shared_orders_sorter_names[] = {
        STR_SORT_BY_NUM_VEHICLES,
        STR_SORT_BY_TOTAL_PROFIT_THIS_YEAR,
        STR_SORT_BY_TOTAL_PROFIT_LAST_YEAR,
        STR_SORT_BY_AVERAGE_PROFIT_THIS_YEAR,
        STR_SORT_BY_AVERAGE_PROFIT_LAST_YEAR,
        INVALID_STRING_ID
};

const StringID BaseVehicleListWindow::vehicle_group_by_names[] = {
        STR_GROUP_BY_NONE,
        STR_GROUP_BY_SHARED_ORDERS,
        INVALID_STRING_ID
};

const StringID BaseVehicleListWindow::vehicle_depot_name[] = {
        STR_VEHICLE_LIST_SEND_TRAIN_TO_DEPOT,
        STR_VEHICLE_LIST_SEND_ROAD_VEHICLE_TO_DEPOT,
        STR_VEHICLE_LIST_SEND_SHIP_TO_DEPOT,
        STR_VEHICLE_LIST_SEND_AIRCRAFT_TO_HANGAR
};

BaseVehicleListWindow::BaseVehicleListWindow(WindowDesc *desc, WindowNumber wno) : Window(desc), vli(VehicleListIdentifier::UnPack(wno))
{
        this->grouping = _grouping[vli.type][vli.vtype];
        this->UpdateSortingFromGrouping();
}

/**
 * Get the number of digits of space required for the given number.
 * @param number The number.
 * @return The number of digits to allocate space for.
 */
uint CountDigitsForAllocatingSpace(uint number)
{
        if (number >= 10000) return 5;
        if (number >= 1000) return 4;
        if (number >= 100) return 3;

        /*
         * When the smallest unit number is less than 10, it is
         * quite likely that it will expand to become more than
         * 10 quite soon.
         */
        return 2;
}

/**
 * Get the number of digits the biggest unit number of a set of vehicles has.
 * @param vehicles The list of vehicles.
 * @return The number of digits to allocate space for.
 */
uint GetUnitNumberDigits(VehicleList &vehicles)
{
        uint unitnumber = 0;
        for (const Vehicle *v : vehicles) {
                unitnumber = std::max<uint>(unitnumber, v->unitnumber);
        }

        return CountDigitsForAllocatingSpace(unitnumber);
}

void BaseVehicleListWindow::BuildVehicleList()
{
        if (!this->vehgroups.NeedRebuild()) return;

        Debug(misc, 3, "Building vehicle list type {} for company {} given index {}", this->vli.type, this->vli.company, this->vli.index);

        this->vehgroups.clear();

        GenerateVehicleSortList(&this->vehicles, this->vli);

        if (this->grouping == GB_NONE) {
                uint max_unitnumber = 0;
                for (auto it = this->vehicles.begin(); it != this->vehicles.end(); ++it) {
                        this->vehgroups.emplace_back(it, it + 1);

                        max_unitnumber = std::max<uint>(max_unitnumber, (*it)->unitnumber);
                }
                this->unitnumber_digits = CountDigitsForAllocatingSpace(max_unitnumber);
        } else {
                /* Sort by the primary vehicle; we just want all vehicles that share the same orders to form a contiguous range. */
                std::stable_sort(this->vehicles.begin(), this->vehicles.end(), [](const Vehicle * const &u, const Vehicle * const &v) {
                        return u->FirstShared() < v->FirstShared();
                });

                uint max_num_vehicles = 0;

                VehicleList::const_iterator begin = this->vehicles.begin();
                while (begin != this->vehicles.end()) {
                        VehicleList::const_iterator end = std::find_if_not(begin, this->vehicles.cend(), [first_shared = (*begin)->FirstShared()](const Vehicle * const &v) {
                                return v->FirstShared() == first_shared;
                        });

                        this->vehgroups.emplace_back(begin, end);

                        max_num_vehicles = std::max<uint>(max_num_vehicles, static_cast<uint>(end - begin));

                        begin = end;
                }

                this->unitnumber_digits = CountDigitsForAllocatingSpace(max_num_vehicles);
        }

        this->vehgroups.RebuildDone();
        this->vscroll->SetCount(static_cast<int>(this->vehgroups.size()));
}

/**
 * Compute the size for the Action dropdown.
 * @param show_autoreplace If true include the autoreplace item.
 * @param show_group If true include group-related stuff.
 * @return Required size.
 */
Dimension BaseVehicleListWindow::GetActionDropdownSize(bool show_autoreplace, bool show_group)
{
        Dimension d = {0, 0};

        if (show_autoreplace) d = maxdim(d, GetStringBoundingBox(STR_VEHICLE_LIST_REPLACE_VEHICLES));
        d = maxdim(d, GetStringBoundingBox(STR_VEHICLE_LIST_SEND_FOR_SERVICING));
        d = maxdim(d, GetStringBoundingBox(this->vehicle_depot_name[this->vli.vtype]));

        if (show_group) {
                d = maxdim(d, GetStringBoundingBox(STR_GROUP_ADD_SHARED_VEHICLE));
                d = maxdim(d, GetStringBoundingBox(STR_GROUP_REMOVE_ALL_VEHICLES));
        }

        return d;
}

void BaseVehicleListWindow::OnInit()
{
        this->order_arrow_width = GetStringBoundingBox(STR_TINY_RIGHT_ARROW).width;
}

/**
 * Display the Action dropdown window.
 * @param show_autoreplace If true include the autoreplace item.
 * @param show_group If true include group-related stuff.
 * @return Itemlist for dropdown
 */
DropDownList BaseVehicleListWindow::BuildActionDropdownList(bool show_autoreplace, bool show_group)
{
        DropDownList list;

        if (show_autoreplace) list.emplace_back(new DropDownListStringItem(STR_VEHICLE_LIST_REPLACE_VEHICLES, ADI_REPLACE, false));
        list.emplace_back(new DropDownListStringItem(STR_VEHICLE_LIST_SEND_FOR_SERVICING, ADI_SERVICE, false));
        list.emplace_back(new DropDownListStringItem(this->vehicle_depot_name[this->vli.vtype], ADI_DEPOT, false));

        if (show_group) {
                list.emplace_back(new DropDownListStringItem(STR_GROUP_ADD_SHARED_VEHICLE, ADI_ADD_SHARED, false));
                list.emplace_back(new DropDownListStringItem(STR_GROUP_REMOVE_ALL_VEHICLES, ADI_REMOVE_ALL, false));
        }

        return list;
}

/* cached values for VehicleNameSorter to spare many GetString() calls */
static const Vehicle *_last_vehicle[2] = { nullptr, nullptr };

void BaseVehicleListWindow::SortVehicleList()
{
        if (this->vehgroups.Sort()) return;

        /* invalidate cached values for name sorter - vehicle names could change */
        _last_vehicle[0] = _last_vehicle[1] = nullptr;
}

void DepotSortList(VehicleList *list)
{
        if (list->size() < 2) return;
        std::sort(list->begin(), list->end(), &VehicleNumberSorter);
}

/** draw the vehicle profit button in the vehicle list window. */
static void DrawVehicleProfitButton(Date age, Money display_profit_last_year, uint num_vehicles, int x, int y)
{
        SpriteID spr;

        /* draw profit-based coloured icons */
        if (age <= VEHICLE_PROFIT_MIN_AGE) {
                spr = SPR_PROFIT_NA;
        } else if (display_profit_last_year < 0) {
                spr = SPR_PROFIT_NEGATIVE;
        } else if (display_profit_last_year < VEHICLE_PROFIT_THRESHOLD * num_vehicles) {
                spr = SPR_PROFIT_SOME;
        } else {
                spr = SPR_PROFIT_LOT;
        }
        DrawSprite(spr, PAL_NONE, x, y);
}

/** Maximum number of refit cycles we try, to prevent infinite loops. And we store only a byte anyway */
static const uint MAX_REFIT_CYCLE = 256;

/**
 * Get the best fitting subtype when 'cloning'/'replacing' \a v_from with \a v_for.
 * All articulated parts of both vehicles are tested to find a possibly shared subtype.
 * For \a v_for only vehicle refittable to \a dest_cargo_type are considered.
 * @param v_from the vehicle to match the subtype from
 * @param v_for  the vehicle to get the subtype for
 * @param dest_cargo_type Destination cargo type.
 * @return the best sub type
 */
byte GetBestFittingSubType(Vehicle *v_from, Vehicle *v_for, CargoID dest_cargo_type)
{
        v_from = v_from->GetFirstEnginePart();
        v_for = v_for->GetFirstEnginePart();

        /* Create a list of subtypes used by the various parts of v_for */
        static std::vector<StringID> subtypes;
        subtypes.clear();
        for (; v_from != nullptr; v_from = v_from->HasArticulatedPart() ? v_from->GetNextArticulatedPart() : nullptr) {
                const Engine *e_from = v_from->GetEngine();
                if (!e_from->CanCarryCargo() || !HasBit(e_from->info.callback_mask, CBM_VEHICLE_CARGO_SUFFIX)) continue;
                include(subtypes, GetCargoSubtypeText(v_from));
        }

        byte ret_refit_cyc = 0;
        bool success = false;
        if (subtypes.size() > 0) {
                /* Check whether any articulated part is refittable to 'dest_cargo_type' with a subtype listed in 'subtypes' */
                for (Vehicle *v = v_for; v != nullptr; v = v->HasArticulatedPart() ? v->GetNextArticulatedPart() : nullptr) {
                        const Engine *e = v->GetEngine();
                        if (!e->CanCarryCargo() || !HasBit(e->info.callback_mask, CBM_VEHICLE_CARGO_SUFFIX)) continue;
                        if (!HasBit(e->info.refit_mask, dest_cargo_type) && v->cargo_type != dest_cargo_type) continue;

                        CargoID old_cargo_type = v->cargo_type;
                        byte old_cargo_subtype = v->cargo_subtype;

                        /* Set the 'destination' cargo */
                        v->cargo_type = dest_cargo_type;

                        /* Cycle through the refits */
                        for (uint refit_cyc = 0; refit_cyc < MAX_REFIT_CYCLE; refit_cyc++) {
                                v->cargo_subtype = refit_cyc;

                                /* Make sure we don't pick up anything cached. */
                                v->First()->InvalidateNewGRFCache();
                                v->InvalidateNewGRFCache();

                                StringID subtype = GetCargoSubtypeText(v);
                                if (subtype == STR_EMPTY) break;

                                if (std::find(subtypes.begin(), subtypes.end(), subtype) == subtypes.end()) continue;

                                /* We found something matching. */
                                ret_refit_cyc = refit_cyc;
                                success = true;
                                break;
                        }

                        /* Reset the vehicle's cargo type */
                        v->cargo_type    = old_cargo_type;
                        v->cargo_subtype = old_cargo_subtype;

                        /* Make sure we don't taint the vehicle. */
                        v->First()->InvalidateNewGRFCache();
                        v->InvalidateNewGRFCache();

                        if (success) break;
                }
        }

        return ret_refit_cyc;
}

/** Option to refit a vehicle chain */
struct RefitOption {
        CargoID cargo;    ///< Cargo to refit to
        byte subtype;     ///< Subcargo to use
        StringID string;  ///< GRF-local String to display for the cargo

        /**
         * Inequality operator for #RefitOption.
         * @param other Compare to this #RefitOption.
         * @return True if both #RefitOption are different.
         */
        inline bool operator != (const RefitOption &other) const
        {
                return other.cargo != this->cargo || other.string != this->string;
        }

        /**
         * Equality operator for #RefitOption.
         * @param other Compare to this #RefitOption.
         * @return True if both #RefitOption are equal.
         */
        inline bool operator == (const RefitOption &other) const
        {
                return other.cargo == this->cargo && other.string == this->string;
        }
};

typedef std::vector<RefitOption> SubtypeList; ///< List of refit subtypes associated to a cargo.

/**
 * Draw the list of available refit options for a consist and highlight the selected refit option (if any).
 * @param list  List of subtype options for each (sorted) cargo.
 * @param sel   Selected refit cargo-type in the window
 * @param pos   Position of the selected item in caller widow
 * @param rows  Number of rows(capacity) in caller window
 * @param delta Step height in caller window
 * @param r     Rectangle of the matrix widget.
 */
static void DrawVehicleRefitWindow(const SubtypeList list[NUM_CARGO], const int sel[2], uint pos, uint rows, uint delta, const Rect &r)
{
        uint y = r.top + WD_MATRIX_TOP;
        uint current = 0;

        bool rtl = _current_text_dir == TD_RTL;
        uint iconwidth = std::max(GetSpriteSize(SPR_CIRCLE_FOLDED).width, GetSpriteSize(SPR_CIRCLE_UNFOLDED).width);
        uint iconheight = GetSpriteSize(SPR_CIRCLE_FOLDED).height;
        int linecolour = _colour_gradient[COLOUR_ORANGE][4];

        int iconleft   = rtl ? r.right - WD_MATRIX_RIGHT - iconwidth     : r.left + WD_MATRIX_LEFT;
        int iconcenter = rtl ? r.right - WD_MATRIX_RIGHT - iconwidth / 2 : r.left + WD_MATRIX_LEFT + iconwidth / 2;
        int iconinner  = rtl ? r.right - WD_MATRIX_RIGHT - iconwidth     : r.left + WD_MATRIX_LEFT + iconwidth;

        int textleft   = r.left  + WD_MATRIX_LEFT  + (rtl ? 0 : iconwidth + 4);
        int textright  = r.right - WD_MATRIX_RIGHT - (rtl ? iconwidth + 4 : 0);

        /* Draw the list of subtypes for each cargo, and find the selected refit option (by its position). */
        for (uint i = 0; current < pos + rows && i < NUM_CARGO; i++) {
                for (uint j = 0; current < pos + rows && j < list[i].size(); j++) {
                        const RefitOption &refit = list[i][j];

                        /* Hide subtypes if sel[0] does not match */
                        if (sel[0] != (int)i && refit.subtype != 0xFF) continue;

                        /* Refit options with a position smaller than pos don't have to be drawn. */
                        if (current < pos) {
                                current++;
                                continue;
                        }

                        if (list[i].size() > 1) {
                                if (refit.subtype != 0xFF) {
                                        /* Draw tree lines */
                                        int ycenter = y + FONT_HEIGHT_NORMAL / 2;
                                        GfxDrawLine(iconcenter, y - WD_MATRIX_TOP, iconcenter, j == list[i].size() - 1 ? ycenter : y - WD_MATRIX_TOP + delta - 1, linecolour);
                                        GfxDrawLine(iconcenter, ycenter, iconinner, ycenter, linecolour);
                                } else {
                                        /* Draw expand/collapse icon */
                                        DrawSprite(sel[0] == (int)i ? SPR_CIRCLE_UNFOLDED : SPR_CIRCLE_FOLDED, PAL_NONE, iconleft, y + (FONT_HEIGHT_NORMAL - iconheight) / 2);
                                }
                        }

                        TextColour colour = (sel[0] == (int)i && (uint)sel[1] == j) ? TC_WHITE : TC_BLACK;
                        /* Get the cargo name. */
                        SetDParam(0, CargoSpec::Get(refit.cargo)->name);
                        SetDParam(1, refit.string);
                        DrawString(textleft, textright, y, STR_JUST_STRING_STRING, colour);

                        y += delta;
                        current++;
                }
        }
}

/** Refit cargo window. */
struct RefitWindow : public Window {
        int sel[2];                  ///< Index in refit options, sel[0] == -1 if nothing is selected.
        RefitOption *cargo;          ///< Refit option selected by #sel.
        SubtypeList list[NUM_CARGO]; ///< List of refit subtypes available for each sorted cargo.
        VehicleOrderID order;        ///< If not #INVALID_VEH_ORDER_ID, selection is part of a refit order (rather than execute directly).
        uint information_width;      ///< Width required for correctly displaying all cargoes in the information panel.
        Scrollbar *vscroll;          ///< The main scrollbar.
        Scrollbar *hscroll;          ///< Only used for long vehicles.
        int vehicle_width;           ///< Width of the vehicle being drawn.
        int sprite_left;             ///< Left position of the vehicle sprite.
        int sprite_right;            ///< Right position of the vehicle sprite.
        uint vehicle_margin;         ///< Margin to use while selecting vehicles when the vehicle image is centered.
        int click_x;                 ///< Position of the first click while dragging.
        VehicleID selected_vehicle;  ///< First vehicle in the current selection.
        uint8 num_vehicles;          ///< Number of selected vehicles.
        bool auto_refit;             ///< Select cargo for auto-refitting.

        /**
         * Collects all (cargo, subcargo) refit options of a vehicle chain.
         */
        void BuildRefitList()
        {
                for (uint i = 0; i < NUM_CARGO; i++) this->list[i].clear();
                Vehicle *v = Vehicle::Get(this->window_number);

                /* Check only the selected vehicles. */
                VehicleSet vehicles_to_refit;
                GetVehicleSet(vehicles_to_refit, Vehicle::Get(this->selected_vehicle), this->num_vehicles);

                do {
                        if (v->type == VEH_TRAIN && std::find(vehicles_to_refit.begin(), vehicles_to_refit.end(), v->index) == vehicles_to_refit.end()) continue;
                        const Engine *e = v->GetEngine();
                        CargoTypes cmask = e->info.refit_mask;
                        byte callback_mask = e->info.callback_mask;

                        /* Skip this engine if it does not carry anything */
                        if (!e->CanCarryCargo()) continue;
                        /* Skip this engine if we build the list for auto-refitting and engine doesn't allow it. */
                        if (this->auto_refit && !HasBit(e->info.misc_flags, EF_AUTO_REFIT)) continue;

                        /* Loop through all cargoes in the refit mask */
                        int current_index = 0;
                        for (const auto &cs : _sorted_cargo_specs) {
                                CargoID cid = cs->Index();
                                /* Skip cargo type if it's not listed */
                                if (!HasBit(cmask, cid)) {
                                        current_index++;
                                        continue;
                                }

                                bool first_vehicle = this->list[current_index].size() == 0;
                                if (first_vehicle) {
                                        /* Keeping the current subtype is always an option. It also serves as the option in case of no subtypes */
                                        this->list[current_index].push_back({cid, 0xFF, STR_EMPTY});
                                }

                                /* Check the vehicle's callback mask for cargo suffixes.
                                 * This is not supported for ordered refits, since subtypes only have a meaning
                                 * for a specific vehicle at a specific point in time, which conflicts with shared orders,
                                 * autoreplace, autorenew, clone, order restoration, ... */
                                if (this->order == INVALID_VEH_ORDER_ID && HasBit(callback_mask, CBM_VEHICLE_CARGO_SUFFIX)) {
                                        /* Make a note of the original cargo type. It has to be
                                         * changed to test the cargo & subtype... */
                                        CargoID temp_cargo = v->cargo_type;
                                        byte temp_subtype  = v->cargo_subtype;

                                        v->cargo_type = cid;

                                        for (uint refit_cyc = 0; refit_cyc < MAX_REFIT_CYCLE; refit_cyc++) {
                                                v->cargo_subtype = refit_cyc;

                                                /* Make sure we don't pick up anything cached. */
                                                v->First()->InvalidateNewGRFCache();
                                                v->InvalidateNewGRFCache();

                                                StringID subtype = GetCargoSubtypeText(v);

                                                if (first_vehicle) {
                                                        /* Append new subtype (don't add duplicates though) */
                                                        if (subtype == STR_EMPTY) break;

                                                        RefitOption option;
                                                        option.cargo   = cid;
                                                        option.subtype = refit_cyc;
                                                        option.string  = subtype;
                                                        include(this->list[current_index], option);
                                                } else {
                                                        /* Intersect the subtypes of earlier vehicles with the subtypes of this vehicle */
                                                        if (subtype == STR_EMPTY) {
                                                                /* No more subtypes for this vehicle, delete all subtypes >= refit_cyc */
                                                                SubtypeList &l = this->list[current_index];
                                                                /* 0xFF item is in front, other subtypes are sorted. So just truncate the list in the right spot */
                                                                for (uint i = 1; i < l.size(); i++) {
                                                                        if (l[i].subtype >= refit_cyc) {
                                                                                l.resize(i);
                                                                                break;
                                                                        }
                                                                }
                                                                break;
                                                        } else {
                                                                /* Check whether the subtype matches with the subtype of earlier vehicles. */
                                                                uint pos = 1;
                                                                SubtypeList &l = this->list[current_index];
                                                                while (pos < l.size() && l[pos].subtype != refit_cyc) pos++;
                                                                if (pos < l.size() && l[pos].string != subtype) {
                                                                        /* String mismatch, remove item keeping the order */
                                                                        l.erase(l.begin() + pos);
                                                                }
                                                        }
                                                }
                                        }

                                        /* Reset the vehicle's cargo type */
                                        v->cargo_type    = temp_cargo;
                                        v->cargo_subtype = temp_subtype;

                                        /* And make sure we haven't tainted the cache */
                                        v->First()->InvalidateNewGRFCache();
                                        v->InvalidateNewGRFCache();
                                }
                                current_index++;
                        }
                } while (v->IsGroundVehicle() && (v = v->Next()) != nullptr);
        }

        /**
         * Refresh scrollbar after selection changed
         */
        void RefreshScrollbar()
        {
                uint scroll_row = 0;
                uint row = 0;

                for (uint i = 0; i < NUM_CARGO; i++) {
                        for (uint j = 0; j < this->list[i].size(); j++) {
                                const RefitOption &refit = this->list[i][j];

                                /* Hide subtypes if sel[0] does not match */
                                if (this->sel[0] != (int)i && refit.subtype != 0xFF) continue;

                                if (this->sel[0] == (int)i && (uint)this->sel[1] == j) scroll_row = row;

                                row++;
                        }
                }

                this->vscroll->SetCount(row);
                if (scroll_row < row) this->vscroll->ScrollTowards(scroll_row);
        }

        /**
         * Select a row.
         * @param click_row Clicked row
         */
        void SetSelection(uint click_row)
        {
                uint row = 0;

                for (uint i = 0; i < NUM_CARGO; i++) {
                        for (uint j = 0; j < this->list[i].size(); j++) {
                                const RefitOption &refit = this->list[i][j];

                                /* Hide subtypes if sel[0] does not match */
                                if (this->sel[0] != (int)i && refit.subtype != 0xFF) continue;

                                if (row == click_row) {
                                        this->sel[0] = i;
                                        this->sel[1] = j;
                                        return;
                                }

                                row++;
                        }
                }

                this->sel[0] = -1;
                this->sel[1] = 0;
        }

        /**
         * Gets the #RefitOption placed in the selected index.
         * @return Pointer to the #RefitOption currently in use.
         */
        RefitOption *GetRefitOption()
        {
                if (this->sel[0] < 0) return nullptr;

                SubtypeList &l = this->list[this->sel[0]];
                if ((uint)this->sel[1] >= l.size()) return nullptr;

                return &l[this->sel[1]];
        }

        RefitWindow(WindowDesc *desc, const Vehicle *v, VehicleOrderID order, bool auto_refit) : Window(desc)
        {
                this->sel[0] = -1;
                this->sel[1] = 0;
                this->auto_refit = auto_refit;
                this->order = order;
                this->CreateNestedTree();

                this->vscroll = this->GetScrollbar(WID_VR_SCROLLBAR);
                this->hscroll = (v->IsGroundVehicle() ? this->GetScrollbar(WID_VR_HSCROLLBAR) : nullptr);
                this->GetWidget<NWidgetCore>(WID_VR_SELECT_HEADER)->tool_tip = STR_REFIT_TRAIN_LIST_TOOLTIP + v->type;
                this->GetWidget<NWidgetCore>(WID_VR_MATRIX)->tool_tip        = STR_REFIT_TRAIN_LIST_TOOLTIP + v->type;
                NWidgetCore *nwi = this->GetWidget<NWidgetCore>(WID_VR_REFIT);
                nwi->widget_data = STR_REFIT_TRAIN_REFIT_BUTTON + v->type;
                nwi->tool_tip    = STR_REFIT_TRAIN_REFIT_TOOLTIP + v->type;
                this->GetWidget<NWidgetStacked>(WID_VR_SHOW_HSCROLLBAR)->SetDisplayedPlane(v->IsGroundVehicle() ? 0 : SZSP_HORIZONTAL);
                this->GetWidget<NWidgetCore>(WID_VR_VEHICLE_PANEL_DISPLAY)->tool_tip = (v->type == VEH_TRAIN) ? STR_REFIT_SELECT_VEHICLES_TOOLTIP : STR_NULL;

                this->FinishInitNested(v->index);
                this->owner = v->owner;

                this->SetWidgetDisabledState(WID_VR_REFIT, this->sel[0] < 0);
        }

        void OnInit() override
        {
                if (this->cargo != nullptr) {
                        /* Store the RefitOption currently in use. */
                        RefitOption current_refit_option = *(this->cargo);

                        /* Rebuild the refit list */
                        this->BuildRefitList();
                        this->sel[0] = -1;
                        this->sel[1] = 0;
                        this->cargo = nullptr;
                        for (uint i = 0; this->cargo == nullptr && i < NUM_CARGO; i++) {
                                for (uint j = 0; j < list[i].size(); j++) {
                                        if (list[i][j] == current_refit_option) {
                                                this->sel[0] = i;
                                                this->sel[1] = j;
                                                this->cargo = &list[i][j];
                                                break;
                                        }
                                }
                        }

                        this->SetWidgetDisabledState(WID_VR_REFIT, this->sel[0] < 0);
                        this->RefreshScrollbar();
                } else {
                        /* Rebuild the refit list */
                        this->OnInvalidateData(VIWD_CONSIST_CHANGED);
                }
        }

        void OnPaint() override
        {
                /* Determine amount of items for scroller. */
                if (this->hscroll != nullptr) this->hscroll->SetCount(this->vehicle_width);

                /* Calculate sprite position. */
                NWidgetCore *vehicle_panel_display = this->GetWidget<NWidgetCore>(WID_VR_VEHICLE_PANEL_DISPLAY);
                int sprite_width = std::max(0, ((int)vehicle_panel_display->current_x - this->vehicle_width) / 2);
                this->sprite_left = vehicle_panel_display->pos_x;
                this->sprite_right = vehicle_panel_display->pos_x + vehicle_panel_display->current_x - 1;
                if (_current_text_dir == TD_RTL) {
                        this->sprite_right -= sprite_width;
                        this->vehicle_margin = vehicle_panel_display->current_x - sprite_right;
                } else {
                        this->sprite_left += sprite_width;
                        this->vehicle_margin = sprite_left;
                }

                this->DrawWidgets();
        }

        void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
        {
                switch (widget) {
                        case WID_VR_MATRIX:
                                resize->height = WD_MATRIX_TOP + FONT_HEIGHT_NORMAL + WD_MATRIX_BOTTOM;
                                size->height = resize->height * 8;
                                break;

                        case WID_VR_VEHICLE_PANEL_DISPLAY:
                                size->height = ScaleGUITrad(GetVehicleHeight(Vehicle::Get(this->window_number)->type));
                                break;

                        case WID_VR_INFO:
                                size->width = WD_FRAMERECT_LEFT + this->information_width + WD_FRAMERECT_RIGHT;
                                break;
                }
        }

        void SetStringParameters(int widget) const override
        {
                if (widget == WID_VR_CAPTION) SetDParam(0, Vehicle::Get(this->window_number)->index);
        }

        /**
         * Gets the #StringID to use for displaying capacity.
         * @param option Cargo and cargo subtype to check for capacity.
         * @return INVALID_STRING_ID if there is no capacity. StringID to use in any other case.
         * @post String parameters have been set.
         */
        StringID GetCapacityString(RefitOption *option) const
        {
                assert(_current_company == _local_company);
                auto [cost, refit_capacity, mail_capacity] = Command<CMD_REFIT_VEHICLE>::Do(DC_QUERY_COST, this->selected_vehicle, option->cargo, option->subtype, this->auto_refit, false, this->num_vehicles);

                if (cost.Failed()) return INVALID_STRING_ID;

                SetDParam(0, option->cargo);
                SetDParam(1, refit_capacity);

                Money money = cost.GetCost();
                if (mail_capacity > 0) {
                        SetDParam(2, CT_MAIL);
                        SetDParam(3, mail_capacity);
                        if (this->order != INVALID_VEH_ORDER_ID) {
                                /* No predictable cost */
                                return STR_PURCHASE_INFO_AIRCRAFT_CAPACITY;
                        } else if (money <= 0) {
                                SetDParam(4, -money);
                                return STR_REFIT_NEW_CAPACITY_INCOME_FROM_AIRCRAFT_REFIT;
                        } else {
                                SetDParam(4, money);
                                return STR_REFIT_NEW_CAPACITY_COST_OF_AIRCRAFT_REFIT;
                        }
                } else {
                        if (this->order != INVALID_VEH_ORDER_ID) {
                                /* No predictable cost */
                                SetDParam(2, STR_EMPTY);
                                return STR_PURCHASE_INFO_CAPACITY;
                        } else if (money <= 0) {
                                SetDParam(2, -money);
                                return STR_REFIT_NEW_CAPACITY_INCOME_FROM_REFIT;
                        } else {
                                SetDParam(2, money);
                                return STR_REFIT_NEW_CAPACITY_COST_OF_REFIT;
                        }
                }
        }

        void DrawWidget(const Rect &r, int widget) const override
        {
                switch (widget) {
                        case WID_VR_VEHICLE_PANEL_DISPLAY: {
                                Vehicle *v = Vehicle::Get(this->window_number);
                                DrawVehicleImage(v, this->sprite_left + WD_FRAMERECT_LEFT, this->sprite_right - WD_FRAMERECT_RIGHT,
                                        r.top + WD_FRAMERECT_TOP, INVALID_VEHICLE, EIT_IN_DETAILS, this->hscroll != nullptr ? this->hscroll->GetPosition() : 0);

                                /* Highlight selected vehicles. */
                                if (this->order != INVALID_VEH_ORDER_ID) break;
                                int x = 0;
                                switch (v->type) {
                                        case VEH_TRAIN: {
                                                VehicleSet vehicles_to_refit;
                                                GetVehicleSet(vehicles_to_refit, Vehicle::Get(this->selected_vehicle), this->num_vehicles);

                                                int left = INT32_MIN;
                                                int width = 0;

                                                for (Train *u = Train::From(v); u != nullptr; u = u->Next()) {
                                                        /* Start checking. */
                                                        const bool contained = std::find(vehicles_to_refit.begin(), vehicles_to_refit.end(), u->index) != vehicles_to_refit.end();
                                                        if (contained && left == INT32_MIN) {
                                                                left = x - this->hscroll->GetPosition() + r.left + this->vehicle_margin;
                                                                width = 0;
                                                        }

                                                        /* Draw a selection. */
                                                        if ((!contained || u->Next() == nullptr) && left != INT32_MIN) {
                                                                if (u->Next() == nullptr && contained) {
                                                                        int current_width = u->GetDisplayImageWidth();
                                                                        width += current_width;
                                                                        x += current_width;
                                                                }

                                                                int right = Clamp(left + width, 0, r.right);
                                                                left = std::max(0, left);

                                                                if (_current_text_dir == TD_RTL) {
                                                                        right = this->GetWidget<NWidgetCore>(WID_VR_VEHICLE_PANEL_DISPLAY)->current_x - left;
                                                                        left = right - width;
                                                                }

                                                                if (left != right) {
                                                                        DrawFrameRect(left, r.top + WD_FRAMERECT_TOP, right, r.top + WD_FRAMERECT_TOP + ScaleGUITrad(14) - 1, COLOUR_WHITE, FR_BORDERONLY);
                                                                }

                                                                left = INT32_MIN;
                                                        }

                                                        int current_width = u->GetDisplayImageWidth();
                                                        width += current_width;
                                                        x += current_width;
                                                }
                                                break;
                                        }

                                        default: break;
                                }
                                break;
                        }

                        case WID_VR_MATRIX:
                                DrawVehicleRefitWindow(this->list, this->sel, this->vscroll->GetPosition(), this->vscroll->GetCapacity(), this->resize.step_height, r);
                                break;

                        case WID_VR_INFO:
                                if (this->cargo != nullptr) {
                                        StringID string = this->GetCapacityString(this->cargo);
                                        if (string != INVALID_STRING_ID) {
                                                DrawStringMultiLine(r.left + WD_FRAMERECT_LEFT, r.right - WD_FRAMERECT_RIGHT,
                                                                r.top + WD_FRAMERECT_TOP, r.bottom - WD_FRAMERECT_BOTTOM, string);
                                        }
                                }
                                break;
                }
        }

        /**
         * Some data on this window has become invalid.
         * @param data Information about the changed data.
         * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
         */
        void OnInvalidateData(int data = 0, bool gui_scope = true) override
        {
                switch (data) {
                        case VIWD_AUTOREPLACE: // Autoreplace replaced the vehicle; selected_vehicle became invalid.
                        case VIWD_CONSIST_CHANGED: { // The consist has changed; rebuild the entire list.
                                /* Clear the selection. */
                                Vehicle *v = Vehicle::Get(this->window_number);
                                this->selected_vehicle = v->index;
                                this->num_vehicles = UINT8_MAX;
                                FALLTHROUGH;
                        }

                        case 2: { // The vehicle selection has changed; rebuild the entire list.
                                if (!gui_scope) break;
                                this->BuildRefitList();

                                /* The vehicle width has changed too. */
                                this->vehicle_width = GetVehicleWidth(Vehicle::Get(this->window_number), EIT_IN_DETAILS);
                                uint max_width = 0;

                                /* Check the width of all cargo information strings. */
                                for (uint i = 0; i < NUM_CARGO; i++) {
                                        for (uint j = 0; j < this->list[i].size(); j++) {
                                                StringID string = this->GetCapacityString(&list[i][j]);
                                                if (string != INVALID_STRING_ID) {
                                                        Dimension dim = GetStringBoundingBox(string);
                                                        max_width = std::max(dim.width, max_width);
                                                }
                                        }
                                }

                                if (this->information_width < max_width) {
                                        this->information_width = max_width;
                                        this->ReInit();
                                }
                                FALLTHROUGH;
                        }

                        case 1: // A new cargo has been selected.
                                if (!gui_scope) break;
                                this->cargo = GetRefitOption();
                                this->RefreshScrollbar();
                                break;
                }
        }

        int GetClickPosition(int click_x)
        {
                const NWidgetCore *matrix_widget = this->GetWidget<NWidgetCore>(WID_VR_VEHICLE_PANEL_DISPLAY);
                if (_current_text_dir == TD_RTL) click_x = matrix_widget->current_x - click_x;
                click_x -= this->vehicle_margin;
                if (this->hscroll != nullptr) click_x += this->hscroll->GetPosition();

                return click_x;
        }

        void SetSelectedVehicles(int drag_x)
        {
                drag_x = GetClickPosition(drag_x);

                int left_x  = std::min(this->click_x, drag_x);
                int right_x = std::max(this->click_x, drag_x);
                this->num_vehicles = 0;

                Vehicle *v = Vehicle::Get(this->window_number);
                /* Find the vehicle part that was clicked. */
                switch (v->type) {
                        case VEH_TRAIN: {
                                /* Don't select anything if we are not clicking in the vehicle. */
                                if (left_x >= 0) {
                                        const Train *u = Train::From(v);
                                        bool start_counting = false;
                                        for (; u != nullptr; u = u->Next()) {
                                                int current_width = u->GetDisplayImageWidth();
                                                left_x  -= current_width;
                                                right_x -= current_width;

                                                if (left_x < 0 && !start_counting) {
                                                        this->selected_vehicle = u->index;
                                                        start_counting = true;

                                                        /* Count the first vehicle, even if articulated part */
                                                        this->num_vehicles++;
                                                } else if (start_counting && !u->IsArticulatedPart()) {
                                                        /* Do not count articulated parts */
                                                        this->num_vehicles++;
                                                }

                                                if (right_x < 0) break;
                                        }
                                }

                                /* If the selection is not correct, clear it. */
                                if (this->num_vehicles != 0) {
                                        if (_ctrl_pressed) this->num_vehicles = UINT8_MAX;
                                        break;
                                }
                                FALLTHROUGH;
                        }

                        default:
                                /* Clear the selection. */
                                this->selected_vehicle = v->index;
                                this->num_vehicles = UINT8_MAX;
                                break;
                }
        }

        void OnClick(Point pt, int widget, int click_count) override
        {
                switch (widget) {
                        case WID_VR_VEHICLE_PANEL_DISPLAY: { // Vehicle image.
                                if (this->order != INVALID_VEH_ORDER_ID) break;
                                NWidgetBase *nwi = this->GetWidget<NWidgetBase>(WID_VR_VEHICLE_PANEL_DISPLAY);
                                this->click_x = GetClickPosition(pt.x - nwi->pos_x);
                                this->SetSelectedVehicles(pt.x - nwi->pos_x);
                                this->SetWidgetDirty(WID_VR_VEHICLE_PANEL_DISPLAY);
                                if (!_ctrl_pressed) {
                                        SetObjectToPlaceWnd(SPR_CURSOR_MOUSE, PAL_NONE, HT_DRAG, this);
                                } else {
                                        /* The vehicle selection has changed. */
                                        this->InvalidateData(2);
                                }
                                break;
                        }

                        case WID_VR_MATRIX: { // listbox
                                this->SetSelection(this->vscroll->GetScrolledRowFromWidget(pt.y, this, WID_VR_MATRIX));
                                this->SetWidgetDisabledState(WID_VR_REFIT, this->sel[0] < 0);
                                this->InvalidateData(1);

                                if (click_count == 1) break;
                                FALLTHROUGH;
                        }

                        case WID_VR_REFIT: // refit button
                                if (this->cargo != nullptr) {
                                        const Vehicle *v = Vehicle::Get(this->window_number);

                                        if (this->order == INVALID_VEH_ORDER_ID) {
                                                bool delete_window = this->selected_vehicle == v->index && this->num_vehicles == UINT8_MAX;
                                                if (Command<CMD_REFIT_VEHICLE>::Post(GetCmdRefitVehMsg(v), v->tile, this->selected_vehicle, this->cargo->cargo, this->cargo->subtype, false, false, this->num_vehicles) && delete_window) this->Close();
                                        } else {
                                                if (Command<CMD_ORDER_REFIT>::Post(v->tile, v->index, this->order, this->cargo->cargo)) this->Close();
                                        }
                                }
                                break;
                }
        }

        void OnMouseDrag(Point pt, int widget) override
        {
                switch (widget) {
                        case WID_VR_VEHICLE_PANEL_DISPLAY: { // Vehicle image.
                                if (this->order != INVALID_VEH_ORDER_ID) break;
                                NWidgetBase *nwi = this->GetWidget<NWidgetBase>(WID_VR_VEHICLE_PANEL_DISPLAY);
                                this->SetSelectedVehicles(pt.x - nwi->pos_x);
                                this->SetWidgetDirty(WID_VR_VEHICLE_PANEL_DISPLAY);
                                break;
                        }
                }
        }

        void OnDragDrop(Point pt, int widget) override
        {
                switch (widget) {
                        case WID_VR_VEHICLE_PANEL_DISPLAY: { // Vehicle image.
                                if (this->order != INVALID_VEH_ORDER_ID) break;
                                NWidgetBase *nwi = this->GetWidget<NWidgetBase>(WID_VR_VEHICLE_PANEL_DISPLAY);
                                this->SetSelectedVehicles(pt.x - nwi->pos_x);
                                this->InvalidateData(2);
                                break;
                        }
                }
        }

        void OnResize() override
        {
                this->vehicle_width = GetVehicleWidth(Vehicle::Get(this->window_number), EIT_IN_DETAILS);
                this->vscroll->SetCapacityFromWidget(this, WID_VR_MATRIX);
                if (this->hscroll != nullptr) this->hscroll->SetCapacityFromWidget(this, WID_VR_VEHICLE_PANEL_DISPLAY);
        }
};

static const NWidgetPart _nested_vehicle_refit_widgets[] = {
        NWidget(NWID_HORIZONTAL),
                NWidget(WWT_CLOSEBOX, COLOUR_GREY),
                NWidget(WWT_CAPTION, COLOUR_GREY, WID_VR_CAPTION), SetDataTip(STR_REFIT_CAPTION, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS),
                NWidget(WWT_DEFSIZEBOX, COLOUR_GREY),
        EndContainer(),
        /* Vehicle display + scrollbar. */
        NWidget(NWID_VERTICAL),
                NWidget(WWT_PANEL, COLOUR_GREY, WID_VR_VEHICLE_PANEL_DISPLAY), SetMinimalSize(228, 14), SetResize(1, 0), SetScrollbar(WID_VR_HSCROLLBAR), EndContainer(),
                NWidget(NWID_SELECTION, INVALID_COLOUR, WID_VR_SHOW_HSCROLLBAR),
                        NWidget(NWID_HSCROLLBAR, COLOUR_GREY, WID_VR_HSCROLLBAR),
                EndContainer(),
        EndContainer(),
        NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_VR_SELECT_HEADER), SetDataTip(STR_REFIT_TITLE, STR_NULL), SetResize(1, 0),
        /* Matrix + scrollbar. */
        NWidget(NWID_HORIZONTAL),
                NWidget(WWT_MATRIX, COLOUR_GREY, WID_VR_MATRIX), SetMinimalSize(228, 112), SetResize(1, 14), SetFill(1, 1), SetMatrixDataTip(1, 0, STR_NULL), SetScrollbar(WID_VR_SCROLLBAR),
                NWidget(NWID_VSCROLLBAR, COLOUR_GREY, WID_VR_SCROLLBAR),
        EndContainer(),
        NWidget(WWT_PANEL, COLOUR_GREY, WID_VR_INFO), SetMinimalTextLines(2, WD_FRAMERECT_TOP + WD_FRAMERECT_BOTTOM), SetResize(1, 0), EndContainer(),
        NWidget(NWID_HORIZONTAL),
                NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_VR_REFIT), SetFill(1, 0), SetResize(1, 0),
                NWidget(WWT_RESIZEBOX, COLOUR_GREY),
        EndContainer(),
};

static WindowDesc _vehicle_refit_desc(
        WDP_AUTO, "view_vehicle_refit", 240, 174,
        WC_VEHICLE_REFIT, WC_VEHICLE_VIEW,
        WDF_CONSTRUCTION,
        _nested_vehicle_refit_widgets, lengthof(_nested_vehicle_refit_widgets)
);

/**
 * Show the refit window for a vehicle
 * @param *v The vehicle to show the refit window for
 * @param order of the vehicle to assign refit to, or INVALID_VEH_ORDER_ID to refit the vehicle now
 * @param parent the parent window of the refit window
 * @param auto_refit Choose cargo for auto-refitting
 */
void ShowVehicleRefitWindow(const Vehicle *v, VehicleOrderID order, Window *parent, bool auto_refit)
{
        CloseWindowById(WC_VEHICLE_REFIT, v->index);
        RefitWindow *w = new RefitWindow(&_vehicle_refit_desc, v, order, auto_refit);
        w->parent = parent;
}

/** Display list of cargo types of the engine, for the purchase information window */
uint ShowRefitOptionsList(int left, int right, int y, EngineID engine)
{
        /* List of cargo types of this engine */
        CargoTypes cmask = GetUnionOfArticulatedRefitMasks(engine, false);
        /* List of cargo types available in this climate */
        CargoTypes lmask = _cargo_mask;

        /* Draw nothing if the engine is not refittable */
        if (HasAtMostOneBit(cmask)) return y;

        if (cmask == lmask) {
                /* Engine can be refitted to all types in this climate */
                SetDParam(0, STR_PURCHASE_INFO_ALL_TYPES);
        } else {
                /* Check if we are able to refit to more cargo types and unable to. If
                 * so, invert the cargo types to list those that we can't refit to. */
                if (CountBits(cmask ^ lmask) < CountBits(cmask) && CountBits(cmask ^ lmask) <= 7) {
                        cmask ^= lmask;
                        SetDParam(0, STR_PURCHASE_INFO_ALL_BUT);
                } else {
                        SetDParam(0, STR_JUST_CARGO_LIST);
                }
                SetDParam(1, cmask);
        }

        return DrawStringMultiLine(left, right, y, INT32_MAX, STR_PURCHASE_INFO_REFITTABLE_TO);
}

/** Get the cargo subtype text from NewGRF for the vehicle details window. */
StringID GetCargoSubtypeText(const Vehicle *v)
{
        if (HasBit(EngInfo(v->engine_type)->callback_mask, CBM_VEHICLE_CARGO_SUFFIX)) {
                uint16 cb = GetVehicleCallback(CBID_VEHICLE_CARGO_SUFFIX, 0, 0, v->engine_type, v);
                if (cb != CALLBACK_FAILED) {
                        if (cb > 0x400) ErrorUnknownCallbackResult(v->GetGRFID(), CBID_VEHICLE_CARGO_SUFFIX, cb);
                        if (cb >= 0x400 || (v->GetGRF()->grf_version < 8 && cb == 0xFF)) cb = CALLBACK_FAILED;
                }
                if (cb != CALLBACK_FAILED) {
                        return GetGRFStringID(v->GetGRFID(), 0xD000 + cb);
                }
        }
        return STR_EMPTY;
}

/** Sort vehicle groups by the number of vehicles in the group */
static bool VehicleGroupLengthSorter(const GUIVehicleGroup &a, const GUIVehicleGroup &b)
{
        return a.NumVehicles() < b.NumVehicles();
}

/** Sort vehicle groups by the total profit this year */
static bool VehicleGroupTotalProfitThisYearSorter(const GUIVehicleGroup &a, const GUIVehicleGroup &b)
{
        return a.GetDisplayProfitThisYear() < b.GetDisplayProfitThisYear();
}

/** Sort vehicle groups by the total profit last year */
static bool VehicleGroupTotalProfitLastYearSorter(const GUIVehicleGroup &a, const GUIVehicleGroup &b)
{
        return a.GetDisplayProfitLastYear() < b.GetDisplayProfitLastYear();
}

/** Sort vehicle groups by the average profit this year */
static bool VehicleGroupAverageProfitThisYearSorter(const GUIVehicleGroup &a, const GUIVehicleGroup &b)
{
        return a.GetDisplayProfitThisYear() * static_cast<uint>(b.NumVehicles()) < b.GetDisplayProfitThisYear() * static_cast<uint>(a.NumVehicles());
}

/** Sort vehicle groups by the average profit last year */
static bool VehicleGroupAverageProfitLastYearSorter(const GUIVehicleGroup &a, const GUIVehicleGroup &b)
{
        return a.GetDisplayProfitLastYear() * static_cast<uint>(b.NumVehicles()) < b.GetDisplayProfitLastYear() * static_cast<uint>(a.NumVehicles());
}

/** Sort vehicles by their number */
static bool VehicleNumberSorter(const Vehicle * const &a, const Vehicle * const &b)
{
        return a->unitnumber < b->unitnumber;
}

/** Sort vehicles by their name */
static bool VehicleNameSorter(const Vehicle * const &a, const Vehicle * const &b)
{
        static char last_name[2][64];

        if (a != _last_vehicle[0]) {
                _last_vehicle[0] = a;
                SetDParam(0, a->index);
                GetString(last_name[0], STR_VEHICLE_NAME, lastof(last_name[0]));
        }

        if (b != _last_vehicle[1]) {
                _last_vehicle[1] = b;
                SetDParam(0, b->index);
                GetString(last_name[1], STR_VEHICLE_NAME, lastof(last_name[1]));
        }

        int r = strnatcmp(last_name[0], last_name[1]); // Sort by name (natural sorting).
        return (r != 0) ? r < 0: VehicleNumberSorter(a, b);
}

/** Sort vehicles by their age */
static bool VehicleAgeSorter(const Vehicle * const &a, const Vehicle * const &b)
{
        int r = a->age - b->age;
        return (r != 0) ? r < 0 : VehicleNumberSorter(a, b);
}

/** Sort vehicles by this year profit */
static bool VehicleProfitThisYearSorter(const Vehicle * const &a, const Vehicle * const &b)
{
        int r = ClampToI32(a->GetDisplayProfitThisYear() - b->GetDisplayProfitThisYear());
        return (r != 0) ? r < 0 : VehicleNumberSorter(a, b);
}

/** Sort vehicles by last year profit */
static bool VehicleProfitLastYearSorter(const Vehicle * const &a, const Vehicle * const &b)
{
        int r = ClampToI32(a->GetDisplayProfitLastYear() - b->GetDisplayProfitLastYear());
        return (r != 0) ? r < 0 : VehicleNumberSorter(a, b);
}

/** Sort vehicles by their cargo */
static bool VehicleCargoSorter(const Vehicle * const &a, const Vehicle * const &b)
{
        const Vehicle *v;
        CargoArray diff;

        /* Append the cargo of the connected waggons */
        for (v = a; v != nullptr; v = v->Next()) diff[v->cargo_type] += v->cargo_cap;
        for (v = b; v != nullptr; v = v->Next()) diff[v->cargo_type] -= v->cargo_cap;

        int r = 0;
        for (CargoID i = 0; i < NUM_CARGO; i++) {
                r = diff[i];
                if (r != 0) break;
        }

        return (r != 0) ? r < 0 : VehicleNumberSorter(a, b);
}

/** Sort vehicles by their reliability */
static bool VehicleReliabilitySorter(const Vehicle * const &a, const Vehicle * const &b)
{
        int r = a->reliability - b->reliability;
        return (r != 0) ? r < 0 : VehicleNumberSorter(a, b);
}

/** Sort vehicles by their max speed */
static bool VehicleMaxSpeedSorter(const Vehicle * const &a, const Vehicle * const &b)
{
        int r = a->vcache.cached_max_speed - b->vcache.cached_max_speed;
        return (r != 0) ? r < 0 : VehicleNumberSorter(a, b);
}

/** Sort vehicles by model */
static bool VehicleModelSorter(const Vehicle * const &a, const Vehicle * const &b)
{
        int r = a->engine_type - b->engine_type;
        return (r != 0) ? r < 0 : VehicleNumberSorter(a, b);
}

/** Sort vehicles by their value */
static bool VehicleValueSorter(const Vehicle * const &a, const Vehicle * const &b)
{
        const Vehicle *u;
        Money diff = 0;

        for (u = a; u != nullptr; u = u->Next()) diff += u->value;
        for (u = b; u != nullptr; u = u->Next()) diff -= u->value;

        int r = ClampToI32(diff);
        return (r != 0) ? r < 0 : VehicleNumberSorter(a, b);
}

/** Sort vehicles by their length */
static bool VehicleLengthSorter(const Vehicle * const &a, const Vehicle * const &b)
{
        int r = a->GetGroundVehicleCache()->cached_total_length - b->GetGroundVehicleCache()->cached_total_length;
        return (r != 0) ? r < 0 : VehicleNumberSorter(a, b);
}

/** Sort vehicles by the time they can still live */
static bool VehicleTimeToLiveSorter(const Vehicle * const &a, const Vehicle * const &b)
{
        int r = ClampToI32((a->max_age - a->age) - (b->max_age - b->age));
        return (r != 0) ? r < 0 : VehicleNumberSorter(a, b);
}

/** Sort vehicles by the timetable delay */
static bool VehicleTimetableDelaySorter(const Vehicle * const &a, const Vehicle * const &b)
{
        int r = a->lateness_counter - b->lateness_counter;
        return (r != 0) ? r < 0 : VehicleNumberSorter(a, b);
}

void InitializeGUI()
{
        MemSetT(&_grouping, 0);
        MemSetT(&_sorting, 0);
}

/**
 * Assign a vehicle window a new vehicle
 * @param window_class WindowClass to search for
 * @param from_index the old vehicle ID
 * @param to_index the new vehicle ID
 */
static inline void ChangeVehicleWindow(WindowClass window_class, VehicleID from_index, VehicleID to_index)
{
        Window *w = FindWindowById(window_class, from_index);
        if (w != nullptr) {
                /* Update window_number */
                w->window_number = to_index;
                if (w->viewport != nullptr) w->viewport->follow_vehicle = to_index;

                /* Update vehicle drag data */
                if (_thd.window_class == window_class && _thd.window_number == (WindowNumber)from_index) {
                        _thd.window_number = to_index;
                }

                /* Notify the window. */
                w->InvalidateData(VIWD_AUTOREPLACE, false);
        }
}

/**
 * Report a change in vehicle IDs (due to autoreplace) to affected vehicle windows.
 * @param from_index the old vehicle ID
 * @param to_index the new vehicle ID
 */
void ChangeVehicleViewWindow(VehicleID from_index, VehicleID to_index)
{
        ChangeVehicleWindow(WC_VEHICLE_VIEW,      from_index, to_index);
        ChangeVehicleWindow(WC_VEHICLE_ORDERS,    from_index, to_index);
        ChangeVehicleWindow(WC_VEHICLE_REFIT,     from_index, to_index);
        ChangeVehicleWindow(WC_VEHICLE_DETAILS,   from_index, to_index);
        ChangeVehicleWindow(WC_VEHICLE_TIMETABLE, from_index, to_index);
}

static const NWidgetPart _nested_vehicle_list[] = {
        NWidget(NWID_HORIZONTAL),
                NWidget(WWT_CLOSEBOX, COLOUR_GREY),
                NWidget(NWID_SELECTION, INVALID_COLOUR, WID_VL_CAPTION_SELECTION),
                        NWidget(WWT_CAPTION, COLOUR_GREY, WID_VL_CAPTION),
                        NWidget(NWID_HORIZONTAL),
                                NWidget(WWT_CAPTION, COLOUR_GREY, WID_VL_CAPTION_SHARED_ORDERS),
                                NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_VL_ORDER_VIEW), SetMinimalSize(61, 14), SetDataTip(STR_GOTO_ORDER_VIEW, STR_GOTO_ORDER_VIEW_TOOLTIP),
                        EndContainer(),
                EndContainer(),
                NWidget(WWT_SHADEBOX, COLOUR_GREY),
                NWidget(WWT_DEFSIZEBOX, COLOUR_GREY),
                NWidget(WWT_STICKYBOX, COLOUR_GREY),
        EndContainer(),

        NWidget(NWID_HORIZONTAL),
                NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_VL_GROUP_ORDER), SetMinimalSize(81, 12), SetFill(0, 1), SetDataTip(STR_STATION_VIEW_GROUP, STR_TOOLTIP_GROUP_ORDER),
                NWidget(WWT_DROPDOWN, COLOUR_GREY, WID_VL_GROUP_BY_PULLDOWN), SetMinimalSize(167, 12), SetFill(0, 1), SetDataTip(0x0, STR_TOOLTIP_GROUP_ORDER),
                NWidget(WWT_PANEL, COLOUR_GREY), SetMinimalSize(12, 12), SetFill(1, 1), SetResize(1, 0), EndContainer(),
        EndContainer(),

        NWidget(NWID_HORIZONTAL),
                NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_VL_SORT_ORDER), SetMinimalSize(81, 12), SetFill(0, 1), SetDataTip(STR_BUTTON_SORT_BY, STR_TOOLTIP_SORT_ORDER),
                NWidget(WWT_DROPDOWN, COLOUR_GREY, WID_VL_SORT_BY_PULLDOWN), SetMinimalSize(167, 12), SetFill(0, 1), SetDataTip(0x0, STR_TOOLTIP_SORT_CRITERIA),
                NWidget(WWT_PANEL, COLOUR_GREY), SetMinimalSize(12, 12), SetFill(1, 1), SetResize(1, 0), EndContainer(),
        EndContainer(),

        NWidget(NWID_HORIZONTAL),
                NWidget(WWT_MATRIX, COLOUR_GREY, WID_VL_LIST), SetMinimalSize(248, 0), SetFill(1, 0), SetResize(1, 1), SetMatrixDataTip(1, 0, STR_NULL), SetScrollbar(WID_VL_SCROLLBAR),
                NWidget(NWID_VSCROLLBAR, COLOUR_GREY, WID_VL_SCROLLBAR),
        EndContainer(),

        NWidget(NWID_HORIZONTAL),
                NWidget(NWID_SELECTION, INVALID_COLOUR, WID_VL_HIDE_BUTTONS),
                        NWidget(NWID_HORIZONTAL),
                                NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_VL_AVAILABLE_VEHICLES), SetMinimalSize(106, 12), SetFill(0, 1),
                                                                SetDataTip(STR_BLACK_STRING, STR_VEHICLE_LIST_AVAILABLE_ENGINES_TOOLTIP),
                                NWidget(WWT_PANEL, COLOUR_GREY), SetMinimalSize(0, 12), SetResize(1, 0), SetFill(1, 1), EndContainer(),
                                NWidget(WWT_DROPDOWN, COLOUR_GREY, WID_VL_MANAGE_VEHICLES_DROPDOWN), SetMinimalSize(118, 12), SetFill(0, 1),
                                                                SetDataTip(STR_VEHICLE_LIST_MANAGE_LIST, STR_VEHICLE_LIST_MANAGE_LIST_TOOLTIP),
                                NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, WID_VL_STOP_ALL), SetMinimalSize(12, 12), SetFill(0, 1),
                                                                SetDataTip(SPR_FLAG_VEH_STOPPED, STR_VEHICLE_LIST_MASS_STOP_LIST_TOOLTIP),
                                NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, WID_VL_START_ALL), SetMinimalSize(12, 12), SetFill(0, 1),
                                                                SetDataTip(SPR_FLAG_VEH_RUNNING, STR_VEHICLE_LIST_MASS_START_LIST_TOOLTIP),
                        EndContainer(),
                        /* Widget to be shown for other companies hiding the previous 5 widgets. */
                        NWidget(WWT_PANEL, COLOUR_GREY), SetFill(1, 1), SetResize(1, 0), EndContainer(),
                EndContainer(),
                NWidget(WWT_RESIZEBOX, COLOUR_GREY),
        EndContainer(),
};

static void DrawSmallOrderList(const Vehicle *v, int left, int right, int y, uint order_arrow_width, VehicleOrderID start)
{
        const Order *order = v->GetOrder(start);
        if (order == nullptr) return;

        bool rtl = _current_text_dir == TD_RTL;
        int l_offset = rtl ? 0 : order_arrow_width;
        int r_offset = rtl ? order_arrow_width : 0;
        int i = 0;
        VehicleOrderID oid = start;

        do {
                if (oid == v->cur_real_order_index) DrawString(left, right, y, STR_TINY_RIGHT_ARROW, TC_BLACK);

                if (order->IsType(OT_GOTO_STATION)) {
                        SetDParam(0, order->GetDestination());
                        DrawString(left + l_offset, right - r_offset, y, STR_TINY_BLACK_STATION);

                        y += FONT_HEIGHT_SMALL;
                        if (++i == 4) break;
                }

                oid++;
                order = order->next;
                if (order == nullptr) {
                        order = v->orders->GetFirstOrder();
                        oid = 0;
                }
        } while (oid != start);
}

/** Draw small order list in the vehicle GUI, but without the little black arrow.  This is used for shared order groups. */
static void DrawSmallOrderList(const Order *order, int left, int right, int y, uint order_arrow_width)
{
        bool rtl = _current_text_dir == TD_RTL;
        int l_offset = rtl ? 0 : order_arrow_width;
        int r_offset = rtl ? order_arrow_width : 0;
        int i = 0;
        while (order != nullptr) {
                if (order->IsType(OT_GOTO_STATION)) {
                        SetDParam(0, order->GetDestination());
                        DrawString(left + l_offset, right - r_offset, y, STR_TINY_BLACK_STATION);

                        y += FONT_HEIGHT_SMALL;
                        if (++i == 4) break;
                }
                order = order->next;
        }
}

/**
 * Draws an image of a vehicle chain
 * @param v         Front vehicle
 * @param left      The minimum horizontal position
 * @param right     The maximum horizontal position
 * @param y         Vertical position to draw at
 * @param selection Selected vehicle to draw a frame around
 * @param skip      Number of pixels to skip at the front (for scrolling)
 */
void DrawVehicleImage(const Vehicle *v, int left, int right, int y, VehicleID selection, EngineImageType image_type, int skip)
{
        switch (v->type) {
                case VEH_TRAIN:    DrawTrainImage(Train::From(v), left, right, y, selection, image_type, skip); break;
                case VEH_ROAD:     DrawRoadVehImage(v, left, right, y, selection, image_type, skip);  break;
                case VEH_SHIP:     DrawShipImage(v, left, right, y, selection, image_type);     break;
                case VEH_AIRCRAFT: DrawAircraftImage(v, left, right, y, selection, image_type); break;
                default: NOT_REACHED();
        }
}

/**
 * Get the height of a vehicle in the vehicle list GUIs.
 * @param type    the vehicle type to look at
 * @param divisor the resulting height must be dividable by this
 * @return the height
 */
uint GetVehicleListHeight(VehicleType type, uint divisor)
{
        /* Name + vehicle + profit */
        uint base = ScaleGUITrad(GetVehicleHeight(type)) + 2 * FONT_HEIGHT_SMALL;
        /* Drawing of the 4 small orders + profit*/
        if (type >= VEH_SHIP) base = std::max(base, 5U * FONT_HEIGHT_SMALL);

        if (divisor == 1) return base;

        /* Make sure the height is dividable by divisor */
        uint rem = base % divisor;
        return base + (rem == 0 ? 0 : divisor - rem);
}

/**
 * Draw all the vehicle list items.
 * @param selected_vehicle The vehicle that is to be highlighted.
 * @param line_height      Height of a single item line.
 * @param r                Rectangle with edge positions of the matrix widget.
 */
void BaseVehicleListWindow::DrawVehicleListItems(VehicleID selected_vehicle, int line_height, const Rect &r) const
{
        int left = r.left + WD_MATRIX_LEFT;
        int right = r.right - WD_MATRIX_RIGHT;
        int width = right - left;
        bool rtl = _current_text_dir == TD_RTL;

        int text_offset = std::max<int>(GetSpriteSize(SPR_PROFIT_LOT).width, GetDigitWidth() * this->unitnumber_digits) + WD_FRAMERECT_RIGHT;
        int text_left  = left  + (rtl ?           0 : text_offset);
        int text_right = right - (rtl ? text_offset :           0);

        bool show_orderlist = this->vli.vtype >= VEH_SHIP;
        int orderlist_left  = left  + (rtl ? 0 : std::max(ScaleGUITrad(100) + text_offset, width / 2));
        int orderlist_right = right - (rtl ? std::max(ScaleGUITrad(100) + text_offset, width / 2) : 0);

        int image_left  = (rtl && show_orderlist) ? orderlist_right : text_left;
        int image_right = (!rtl && show_orderlist) ? orderlist_left : text_right;

        int vehicle_button_x = rtl ? right - GetSpriteSize(SPR_PROFIT_LOT).width : left;

        int y = r.top;
        uint max = static_cast<uint>(std::min<size_t>(this->vscroll->GetPosition() + this->vscroll->GetCapacity(), this->vehgroups.size()));
        for (uint i = this->vscroll->GetPosition(); i < max; ++i) {

                const GUIVehicleGroup &vehgroup = this->vehgroups[i];

                SetDParam(0, vehgroup.GetDisplayProfitThisYear());
                SetDParam(1, vehgroup.GetDisplayProfitLastYear());
                DrawString(text_left, text_right, y + line_height - FONT_HEIGHT_SMALL - WD_FRAMERECT_BOTTOM - 1, STR_VEHICLE_LIST_PROFIT_THIS_YEAR_LAST_YEAR);

                DrawVehicleProfitButton(vehgroup.GetOldestVehicleAge(), vehgroup.GetDisplayProfitLastYear(), vehgroup.NumVehicles(), vehicle_button_x, y + FONT_HEIGHT_NORMAL + 3);

                switch (this->grouping) {
                        case GB_NONE: {
                                const Vehicle *v = vehgroup.GetSingleVehicle();

                                if (HasBit(v->vehicle_flags, VF_PATHFINDER_LOST)) {
                                        DrawSprite(SPR_WARNING_SIGN, PAL_NONE, vehicle_button_x, y + FONT_HEIGHT_NORMAL + 3 + GetSpriteSize(SPR_PROFIT_LOT).height);
                                }

                                DrawVehicleImage(v, image_left, image_right, y + FONT_HEIGHT_SMALL - 1, selected_vehicle, EIT_IN_LIST, 0);

                                if (!v->name.empty()) {
                                        /* The vehicle got a name so we will print it */
                                        SetDParam(0, v->index);
                                        DrawString(text_left, text_right, y, STR_TINY_BLACK_VEHICLE);
                                } else if (v->group_id != DEFAULT_GROUP) {
                                        /* The vehicle has no name, but is member of a group, so print group name */
                                        SetDParam(0, v->group_id);
                                        DrawString(text_left, text_right, y, STR_TINY_GROUP, TC_BLACK);
                                }

                                if (show_orderlist) DrawSmallOrderList(v, orderlist_left, orderlist_right, y, this->order_arrow_width, v->cur_real_order_index);

                                StringID str;
                                if (v->IsChainInDepot()) {
                                        str = STR_BLUE_COMMA;
                                } else {
                                        str = (v->age > v->max_age - DAYS_IN_LEAP_YEAR) ? STR_RED_COMMA : STR_BLACK_COMMA;
                                }

                                SetDParam(0, v->unitnumber);
                                DrawString(left, right, y + 2, str);
                                break;
                        }

                        case GB_SHARED_ORDERS:
                                assert(vehgroup.NumVehicles() > 0);

                                for (int i = 0; i < static_cast<int>(vehgroup.NumVehicles()); ++i) {
                                        if (image_left + 8 * i >= image_right) break; // Break if there is no more space to draw any more vehicles anyway.
                                        DrawVehicleImage(vehgroup.vehicles_begin[i], image_left + 8 * i, image_right, y + FONT_HEIGHT_SMALL - 1, selected_vehicle, EIT_IN_LIST, 0);
                                }

                                if (show_orderlist) DrawSmallOrderList((vehgroup.vehicles_begin[0])->GetFirstOrder(), orderlist_left, orderlist_right, y, this->order_arrow_width);

                                SetDParam(0, vehgroup.NumVehicles());
                                DrawString(left, right, y + 2, STR_BLACK_COMMA);
                                break;

                        default:
                                NOT_REACHED();
                }

                y += line_height;
        }
}

void BaseVehicleListWindow::UpdateSortingFromGrouping()
{
        /* Set up sorting. Make the window-specific _sorting variable
         * point to the correct global _sorting struct so we are freed
         * from having conditionals during window operation */
        switch (this->vli.vtype) {
                case VEH_TRAIN:    this->sorting = &_sorting[this->grouping].train; break;
                case VEH_ROAD:     this->sorting = &_sorting[this->grouping].roadveh; break;
                case VEH_SHIP:     this->sorting = &_sorting[this->grouping].ship; break;
                case VEH_AIRCRAFT: this->sorting = &_sorting[this->grouping].aircraft; break;
                default: NOT_REACHED();
        }
        this->vehgroups.SetSortFuncs(this->GetVehicleSorterFuncs());
        this->vehgroups.SetListing(*this->sorting);
        this->vehgroups.ForceRebuild();
        this->vehgroups.NeedResort();
}

void BaseVehicleListWindow::UpdateVehicleGroupBy(GroupBy group_by)
{
        if (this->grouping != group_by) {
                /* Save the old sorting option, so that if we change the grouping option back later on,
                 * UpdateSortingFromGrouping() will automatically restore the saved sorting option. */
                *this->sorting = this->vehgroups.GetListing();

                this->grouping = group_by;
                _grouping[this->vli.type][this->vli.vtype] = group_by;
                this->UpdateSortingFromGrouping();
        }
}

/**
 * Window for the (old) vehicle listing.
 *
 * bitmask for w->window_number
 * 0-7 CompanyID (owner)
 * 8-10 window type (use flags in vehicle_gui.h)
 * 11-15 vehicle type (using VEH_, but can be compressed to fewer bytes if needed)
 * 16-31 StationID or OrderID depending on window type (bit 8-10)
 */
struct VehicleListWindow : public BaseVehicleListWindow {
private:
        /** Enumeration of planes of the button row at the bottom. */
        enum ButtonPlanes {
                BP_SHOW_BUTTONS, ///< Show the buttons.
                BP_HIDE_BUTTONS, ///< Show the empty panel.
        };

        /** Enumeration of planes of the title row at the top. */
        enum CaptionPlanes {
                BP_NORMAL,        ///< Show shared orders caption and buttons.
                BP_SHARED_ORDERS, ///< Show the normal caption.
        };

public:
        VehicleListWindow(WindowDesc *desc, WindowNumber window_number) : BaseVehicleListWindow(desc, window_number)
        {
                this->CreateNestedTree();

                this->vscroll = this->GetScrollbar(WID_VL_SCROLLBAR);

                this->BuildVehicleList();
                this->SortVehicleList();

                /* Set up the window widgets */
                this->GetWidget<NWidgetCore>(WID_VL_LIST)->tool_tip = STR_VEHICLE_LIST_TRAIN_LIST_TOOLTIP + this->vli.vtype;

                NWidgetStacked *nwi = this->GetWidget<NWidgetStacked>(WID_VL_CAPTION_SELECTION);
                if (this->vli.type == VL_SHARED_ORDERS) {
                        this->GetWidget<NWidgetCore>(WID_VL_CAPTION_SHARED_ORDERS)->widget_data = STR_VEHICLE_LIST_SHARED_ORDERS_LIST_CAPTION;
                        /* If we are in the shared orders window, then disable the group-by dropdown menu.
                         * Remove this when the group-by dropdown menu has another option apart from grouping by shared orders. */
                        this->SetWidgetDisabledState(WID_VL_GROUP_ORDER, true);
                        this->SetWidgetDisabledState(WID_VL_GROUP_BY_PULLDOWN, true);
                        nwi->SetDisplayedPlane(BP_SHARED_ORDERS);
                } else {
                        this->GetWidget<NWidgetCore>(WID_VL_CAPTION)->widget_data = STR_VEHICLE_LIST_TRAIN_CAPTION + this->vli.vtype;
                        nwi->SetDisplayedPlane(BP_NORMAL);
                }

                this->FinishInitNested(window_number);
                if (this->vli.company != OWNER_NONE) this->owner = this->vli.company;
        }

        ~VehicleListWindow()
        {
                *this->sorting = this->vehgroups.GetListing();
        }

        void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
        {
                switch (widget) {
                        case WID_VL_LIST:
                                resize->height = GetVehicleListHeight(this->vli.vtype, 1);

                                switch (this->vli.vtype) {
                                        case VEH_TRAIN:
                                        case VEH_ROAD:
                                                size->height = 6 * resize->height;
                                                break;
                                        case VEH_SHIP:
                                        case VEH_AIRCRAFT:
                                                size->height = 4 * resize->height;
                                                break;
                                        default: NOT_REACHED();
                                }
                                break;

                        case WID_VL_SORT_ORDER: {
                                Dimension d = GetStringBoundingBox(this->GetWidget<NWidgetCore>(widget)->widget_data);
                                d.width += padding.width + Window::SortButtonWidth() * 2; // Doubled since the string is centred and it also looks better.
                                d.height += padding.height;
                                *size = maxdim(*size, d);
                                break;
                        }

                        case WID_VL_MANAGE_VEHICLES_DROPDOWN: {
                                Dimension d = this->GetActionDropdownSize(this->vli.type == VL_STANDARD, false);
                                d.height += padding.height;
                                d.width  += padding.width;
                                *size = maxdim(*size, d);
                                break;
                        }
                }
        }

        void SetStringParameters(int widget) const override
        {
                switch (widget) {
                        case WID_VL_AVAILABLE_VEHICLES:
                                SetDParam(0, STR_VEHICLE_LIST_AVAILABLE_TRAINS + this->vli.vtype);
                                break;

                        case WID_VL_CAPTION:
                        case WID_VL_CAPTION_SHARED_ORDERS: {
                                switch (this->vli.type) {
                                        case VL_SHARED_ORDERS: // Shared Orders
                                                if (this->vehicles.size() == 0) {
                                                        /* We can't open this window without vehicles using this order
                                                         * and we should close the window when deleting the order. */
                                                        NOT_REACHED();
                                                }
                                                SetDParam(0, this->vehicles.size());
                                                break;

                                        case VL_STANDARD: // Company Name
                                                SetDParam(0, STR_COMPANY_NAME);
                                                SetDParam(1, this->vli.index);
                                                SetDParam(3, this->vehicles.size());
                                                break;

                                        case VL_STATION_LIST: // Station/Waypoint Name
                                                SetDParam(0, Station::IsExpected(BaseStation::Get(this->vli.index)) ? STR_STATION_NAME : STR_WAYPOINT_NAME);
                                                SetDParam(1, this->vli.index);
                                                SetDParam(3, this->vehicles.size());
                                                break;

                                        case VL_DEPOT_LIST:
                                                SetDParam(0, STR_DEPOT_CAPTION);
                                                SetDParam(1, this->vli.vtype);
                                                SetDParam(2, this->vli.index);
                                                SetDParam(3, this->vehicles.size());
                                                break;
                                        default: NOT_REACHED();
                                }
                                break;
                        }
                }
        }

        void DrawWidget(const Rect &r, int widget) const override
        {
                switch (widget) {
                        case WID_VL_SORT_ORDER:
                                /* draw arrow pointing up/down for ascending/descending sorting */
                                this->DrawSortButtonState(widget, this->vehgroups.IsDescSortOrder() ? SBS_DOWN : SBS_UP);
                                break;

                        case WID_VL_LIST:
                                this->DrawVehicleListItems(INVALID_VEHICLE, this->resize.step_height, r);
                                break;
                }
        }

        void OnPaint() override
        {
                this->BuildVehicleList();
                this->SortVehicleList();

                if (this->vehicles.size() == 0 && this->IsWidgetLowered(WID_VL_MANAGE_VEHICLES_DROPDOWN)) {
                        HideDropDownMenu(this);
                }

                /* Hide the widgets that we will not use in this window
                 * Some windows contains actions only fit for the owner */
                int plane_to_show = (this->owner == _local_company) ? BP_SHOW_BUTTONS : BP_HIDE_BUTTONS;
                NWidgetStacked *nwi = this->GetWidget<NWidgetStacked>(WID_VL_HIDE_BUTTONS);
                if (plane_to_show != nwi->shown_plane) {
                        nwi->SetDisplayedPlane(plane_to_show);
                        nwi->SetDirty(this);
                }
                if (this->owner == _local_company) {
                        this->SetWidgetDisabledState(WID_VL_AVAILABLE_VEHICLES, this->vli.type != VL_STANDARD);
                        this->SetWidgetsDisabledState(this->vehicles.size() == 0,
                                WID_VL_MANAGE_VEHICLES_DROPDOWN,
                                WID_VL_STOP_ALL,
                                WID_VL_START_ALL,
                                WIDGET_LIST_END);
                }

                /* Set text of group by dropdown widget. */
                this->GetWidget<NWidgetCore>(WID_VL_GROUP_BY_PULLDOWN)->widget_data = this->vehicle_group_by_names[this->grouping];

                /* Set text of sort by dropdown widget. */
                this->GetWidget<NWidgetCore>(WID_VL_SORT_BY_PULLDOWN)->widget_data = this->GetVehicleSorterNames()[this->vehgroups.SortType()];

                this->DrawWidgets();
        }

        void OnClick(Point pt, int widget, int click_count) override
        {
                switch (widget) {
                    case WID_VL_ORDER_VIEW: // Open the shared orders window
                                assert(this->vli.type == VL_SHARED_ORDERS);
                                assert(!this->vehicles.empty());
                                ShowOrdersWindow(this->vehicles[0]);
                                break;

                        case WID_VL_SORT_ORDER: // Flip sorting method ascending/descending
                                this->vehgroups.ToggleSortOrder();
                                this->SetDirty();
                                break;

                        case WID_VL_GROUP_BY_PULLDOWN: // Select sorting criteria dropdown menu
                                ShowDropDownMenu(this, this->vehicle_group_by_names, this->grouping, WID_VL_GROUP_BY_PULLDOWN, 0, 0);
                                return;

                        case WID_VL_SORT_BY_PULLDOWN: // Select sorting criteria dropdown menu
                                ShowDropDownMenu(this, this->GetVehicleSorterNames(), this->vehgroups.SortType(), WID_VL_SORT_BY_PULLDOWN, 0,
                                                (this->vli.vtype == VEH_TRAIN || this->vli.vtype == VEH_ROAD) ? 0 : (1 << 10));
                                return;

                        case WID_VL_LIST: { // Matrix to show vehicles
                                uint id_v = this->vscroll->GetScrolledRowFromWidget(pt.y, this, WID_VL_LIST);
                                if (id_v >= this->vehgroups.size()) return; // click out of list bound

                                const GUIVehicleGroup &vehgroup = this->vehgroups[id_v];
                                switch (this->grouping) {
                                        case GB_NONE: {
                                                const Vehicle *v = vehgroup.GetSingleVehicle();
                                                if (!VehicleClicked(v)) {
                                                        if (_ctrl_pressed) {
                                                                ShowCompanyGroupForVehicle(v);
                                                        } else {
                                                                ShowVehicleViewWindow(v);
                                                        }
                                                }
                                                break;
                                        }

                                        case GB_SHARED_ORDERS: {
                                                assert(vehgroup.NumVehicles() > 0);
                                                const Vehicle *v = vehgroup.vehicles_begin[0];
                                                /* We do not support VehicleClicked() here since the contextual action may only make sense for individual vehicles */

                                                if (_ctrl_pressed) {
                                                        ShowOrdersWindow(v);
                                                } else {
                                                        if (vehgroup.NumVehicles() == 1) {
                                                                ShowVehicleViewWindow(v);
                                                        } else {
                                                                ShowVehicleListWindow(v);
                                                        }
                                                }
                                                break;
                                        }

                                        default: NOT_REACHED();
                                }

                                break;
                        }

                        case WID_VL_AVAILABLE_VEHICLES:
                                ShowBuildVehicleWindow(INVALID_TILE, this->vli.vtype);
                                break;

                        case WID_VL_MANAGE_VEHICLES_DROPDOWN: {
                                ShowDropDownList(this, this->BuildActionDropdownList(VehicleListIdentifier::UnPack(this->window_number).type == VL_STANDARD, false), 0, WID_VL_MANAGE_VEHICLES_DROPDOWN);
                                break;
                        }

                        case WID_VL_STOP_ALL:
                        case WID_VL_START_ALL:
                                Command<CMD_MASS_START_STOP>::Post(0, widget == WID_VL_START_ALL, true, this->vli);
                                break;
                }
        }

        void OnDropdownSelect(int widget, int index) override
        {
                switch (widget) {
                        case WID_VL_GROUP_BY_PULLDOWN:
                                this->UpdateVehicleGroupBy(static_cast<GroupBy>(index));
                                break;

                        case WID_VL_SORT_BY_PULLDOWN:
                                this->vehgroups.SetSortType(index);
                                break;

                        case WID_VL_MANAGE_VEHICLES_DROPDOWN:
                                assert(this->vehicles.size() != 0);

                                switch (index) {
                                        case ADI_REPLACE: // Replace window
                                                ShowReplaceGroupVehicleWindow(ALL_GROUP, this->vli.vtype);
                                                break;
                                        case ADI_SERVICE: // Send for servicing
                                        case ADI_DEPOT: // Send to Depots
                                                Command<CMD_SEND_VEHICLE_TO_DEPOT>::Post(GetCmdSendToDepotMsg(this->vli.vtype), 0, DepotCommand::MassSend | (index == ADI_SERVICE ? DepotCommand::Service : DepotCommand::None), this->vli);
                                                break;

                                        default: NOT_REACHED();
                                }
                                break;

                        default: NOT_REACHED();
                }
                this->SetDirty();
        }

        void OnGameTick() override
        {
                if (this->vehgroups.NeedResort()) {
                        StationID station = (this->vli.type == VL_STATION_LIST) ? this->vli.index : INVALID_STATION;

                        Debug(misc, 3, "Periodic resort {} list company {} at station {}", this->vli.vtype, this->owner, station);
                        this->SetDirty();
                }
        }

        void OnResize() override
        {
                this->vscroll->SetCapacityFromWidget(this, WID_VL_LIST);
        }

        /**
         * Some data on this window has become invalid.
         * @param data Information about the changed data.
         * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
         */
        void OnInvalidateData(int data = 0, bool gui_scope = true) override
        {
                if (!gui_scope && HasBit(data, 31) && this->vli.type == VL_SHARED_ORDERS) {
                        /* Needs to be done in command-scope, so everything stays valid */
                        this->vli.index = GB(data, 0, 20);
                        this->window_number = this->vli.Pack();
                        this->vehgroups.ForceRebuild();
                        return;
                }

                if (data == 0) {
                        /* This needs to be done in command-scope to enforce rebuilding before resorting invalid data */
                        this->vehgroups.ForceRebuild();
                } else {
                        this->vehgroups.ForceResort();
                }
        }
};

static WindowDesc _vehicle_list_other_desc(
        WDP_AUTO, "list_vehicles", 260, 246,
        WC_INVALID, WC_NONE,
        0,
        _nested_vehicle_list, lengthof(_nested_vehicle_list)
);

static WindowDesc _vehicle_list_train_desc(
        WDP_AUTO, "list_vehicles_train", 325, 246,
        WC_TRAINS_LIST, WC_NONE,
        0,
        _nested_vehicle_list, lengthof(_nested_vehicle_list)
);

static void ShowVehicleListWindowLocal(CompanyID company, VehicleListType vlt, VehicleType vehicle_type, uint32 unique_number)
{
        if (!Company::IsValidID(company) && company != OWNER_NONE) return;

        WindowNumber num = VehicleListIdentifier(vlt, vehicle_type, company, unique_number).Pack();
        if (vehicle_type == VEH_TRAIN) {
                AllocateWindowDescFront<VehicleListWindow>(&_vehicle_list_train_desc, num);
        } else {
                _vehicle_list_other_desc.cls = GetWindowClassForVehicleType(vehicle_type);
                AllocateWindowDescFront<VehicleListWindow>(&_vehicle_list_other_desc, num);
        }
}

void ShowVehicleListWindow(CompanyID company, VehicleType vehicle_type)
{
        /* If _settings_client.gui.advanced_vehicle_list > 1, display the Advanced list
         * if _settings_client.gui.advanced_vehicle_list == 1, display Advanced list only for local company
         * if _ctrl_pressed, do the opposite action (Advanced list x Normal list)
         */

        if ((_settings_client.gui.advanced_vehicle_list > (uint)(company != _local_company)) != _ctrl_pressed) {
                ShowCompanyGroup(company, vehicle_type);
        } else {
                ShowVehicleListWindowLocal(company, VL_STANDARD, vehicle_type, company);
        }
}

void ShowVehicleListWindow(const Vehicle *v)
{
        ShowVehicleListWindowLocal(v->owner, VL_SHARED_ORDERS, v->type, v->FirstShared()->index);
}

void ShowVehicleListWindow(CompanyID company, VehicleType vehicle_type, StationID station)
{
        ShowVehicleListWindowLocal(company, VL_STATION_LIST, vehicle_type, station);
}

void ShowVehicleListWindow(CompanyID company, VehicleType vehicle_type, TileIndex depot_tile)
{
        uint16 depot_airport_index;

        if (vehicle_type == VEH_AIRCRAFT) {
                depot_airport_index = GetStationIndex(depot_tile);
        } else {
                depot_airport_index = GetDepotIndex(depot_tile);
        }
        ShowVehicleListWindowLocal(company, VL_DEPOT_LIST, vehicle_type, depot_airport_index);
}


/* Unified vehicle GUI - Vehicle Details Window */

static_assert(WID_VD_DETAILS_CARGO_CARRIED    == WID_VD_DETAILS_CARGO_CARRIED + TDW_TAB_CARGO   );
static_assert(WID_VD_DETAILS_TRAIN_VEHICLES   == WID_VD_DETAILS_CARGO_CARRIED + TDW_TAB_INFO    );
static_assert(WID_VD_DETAILS_CAPACITY_OF_EACH == WID_VD_DETAILS_CARGO_CARRIED + TDW_TAB_CAPACITY);
static_assert(WID_VD_DETAILS_TOTAL_CARGO      == WID_VD_DETAILS_CARGO_CARRIED + TDW_TAB_TOTALS  );

/** Vehicle details widgets (other than train). */
static const NWidgetPart _nested_nontrain_vehicle_details_widgets[] = {
        NWidget(NWID_HORIZONTAL),
                NWidget(WWT_CLOSEBOX, COLOUR_GREY),
                NWidget(WWT_CAPTION, COLOUR_GREY, WID_VD_CAPTION), SetDataTip(STR_VEHICLE_DETAILS_CAPTION, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS),
                NWidget(WWT_SHADEBOX, COLOUR_GREY),
                NWidget(WWT_DEFSIZEBOX, COLOUR_GREY),
                NWidget(WWT_STICKYBOX, COLOUR_GREY),
        EndContainer(),
        NWidget(WWT_PANEL, COLOUR_GREY, WID_VD_TOP_DETAILS), SetMinimalSize(405, 42), SetResize(1, 0), EndContainer(),
        NWidget(WWT_PANEL, COLOUR_GREY, WID_VD_MIDDLE_DETAILS), SetMinimalSize(405, 45), SetResize(1, 0), EndContainer(),
        NWidget(NWID_HORIZONTAL),
                NWidget(WWT_PUSHARROWBTN, COLOUR_GREY, WID_VD_DECREASE_SERVICING_INTERVAL), SetFill(0, 1),
                                SetDataTip(AWV_DECREASE, STR_VEHICLE_DETAILS_DECREASE_SERVICING_INTERVAL_TOOLTIP),
                NWidget(WWT_PUSHARROWBTN, COLOUR_GREY, WID_VD_INCREASE_SERVICING_INTERVAL), SetFill(0, 1),
                                SetDataTip(AWV_INCREASE, STR_VEHICLE_DETAILS_INCREASE_SERVICING_INTERVAL_TOOLTIP),
                NWidget(WWT_DROPDOWN, COLOUR_GREY, WID_VD_SERVICE_INTERVAL_DROPDOWN), SetFill(0, 1),
                                SetDataTip(STR_EMPTY, STR_SERVICE_INTERVAL_DROPDOWN_TOOLTIP),
                NWidget(WWT_PANEL, COLOUR_GREY, WID_VD_SERVICING_INTERVAL), SetFill(1, 1), SetResize(1, 0), EndContainer(),
                NWidget(WWT_RESIZEBOX, COLOUR_GREY),
        EndContainer(),
};

/** Train details widgets. */
static const NWidgetPart _nested_train_vehicle_details_widgets[] = {
        NWidget(NWID_HORIZONTAL),
                NWidget(WWT_CLOSEBOX, COLOUR_GREY),
                NWidget(WWT_CAPTION, COLOUR_GREY, WID_VD_CAPTION), SetDataTip(STR_VEHICLE_DETAILS_CAPTION, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS),
                NWidget(WWT_SHADEBOX, COLOUR_GREY),
                NWidget(WWT_DEFSIZEBOX, COLOUR_GREY),
                NWidget(WWT_STICKYBOX, COLOUR_GREY),
        EndContainer(),
        NWidget(WWT_PANEL, COLOUR_GREY, WID_VD_TOP_DETAILS), SetResize(1, 0), SetMinimalSize(405, 42), EndContainer(),
        NWidget(NWID_HORIZONTAL),
                NWidget(WWT_MATRIX, COLOUR_GREY, WID_VD_MATRIX), SetResize(1, 1), SetMinimalSize(393, 45), SetMatrixDataTip(1, 0, STR_NULL), SetFill(1, 0), SetScrollbar(WID_VD_SCROLLBAR),
                NWidget(NWID_VSCROLLBAR, COLOUR_GREY, WID_VD_SCROLLBAR),
        EndContainer(),
        NWidget(NWID_HORIZONTAL),
                NWidget(WWT_PUSHARROWBTN, COLOUR_GREY, WID_VD_DECREASE_SERVICING_INTERVAL), SetFill(0, 1),
                                SetDataTip(AWV_DECREASE, STR_VEHICLE_DETAILS_DECREASE_SERVICING_INTERVAL_TOOLTIP),
                NWidget(WWT_PUSHARROWBTN, COLOUR_GREY, WID_VD_INCREASE_SERVICING_INTERVAL), SetFill(0, 1),
                                SetDataTip(AWV_INCREASE, STR_VEHICLE_DETAILS_INCREASE_SERVICING_INTERVAL_TOOLTIP),
                NWidget(WWT_DROPDOWN, COLOUR_GREY, WID_VD_SERVICE_INTERVAL_DROPDOWN), SetFill(0, 1),
                                SetDataTip(STR_EMPTY, STR_SERVICE_INTERVAL_DROPDOWN_TOOLTIP),
                NWidget(WWT_PANEL, COLOUR_GREY, WID_VD_SERVICING_INTERVAL), SetFill(1, 1), SetResize(1, 0), EndContainer(),
        EndContainer(),
        NWidget(NWID_HORIZONTAL),
                NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_VD_DETAILS_CARGO_CARRIED), SetMinimalSize(96, 12),
                                SetDataTip(STR_VEHICLE_DETAIL_TAB_CARGO, STR_VEHICLE_DETAILS_TRAIN_CARGO_TOOLTIP), SetFill(1, 0), SetResize(1, 0),
                NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_VD_DETAILS_TRAIN_VEHICLES), SetMinimalSize(99, 12),
                                SetDataTip(STR_VEHICLE_DETAIL_TAB_INFORMATION, STR_VEHICLE_DETAILS_TRAIN_INFORMATION_TOOLTIP), SetFill(1, 0), SetResize(1, 0),
                NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_VD_DETAILS_CAPACITY_OF_EACH), SetMinimalSize(99, 12),
                                SetDataTip(STR_VEHICLE_DETAIL_TAB_CAPACITIES, STR_VEHICLE_DETAILS_TRAIN_CAPACITIES_TOOLTIP), SetFill(1, 0), SetResize(1, 0),
                NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_VD_DETAILS_TOTAL_CARGO), SetMinimalSize(99, 12),
                                SetDataTip(STR_VEHICLE_DETAIL_TAB_TOTAL_CARGO, STR_VEHICLE_DETAILS_TRAIN_TOTAL_CARGO_TOOLTIP), SetFill(1, 0), SetResize(1, 0),
                NWidget(WWT_RESIZEBOX, COLOUR_GREY),
        EndContainer(),
};


extern int GetTrainDetailsWndVScroll(VehicleID veh_id, TrainDetailsWindowTabs det_tab);
extern void DrawTrainDetails(const Train *v, int left, int right, int y, int vscroll_pos, uint16 vscroll_cap, TrainDetailsWindowTabs det_tab);
extern void DrawRoadVehDetails(const Vehicle *v, int left, int right, int y);
extern void DrawShipDetails(const Vehicle *v, int left, int right, int y);
extern void DrawAircraftDetails(const Aircraft *v, int left, int right, int y);

static StringID _service_interval_dropdown[] = {
        STR_VEHICLE_DETAILS_DEFAULT,
        STR_VEHICLE_DETAILS_DAYS,
        STR_VEHICLE_DETAILS_PERCENT,
        INVALID_STRING_ID,
};

/** Class for managing the vehicle details window. */
struct VehicleDetailsWindow : Window {
        TrainDetailsWindowTabs tab; ///< For train vehicles: which tab is displayed.
        Scrollbar *vscroll;

        /** Initialize a newly created vehicle details window */
        VehicleDetailsWindow(WindowDesc *desc, WindowNumber window_number) : Window(desc)
        {
                const Vehicle *v = Vehicle::Get(window_number);

                this->CreateNestedTree();
                this->vscroll = (v->type == VEH_TRAIN ? this->GetScrollbar(WID_VD_SCROLLBAR) : nullptr);
                this->FinishInitNested(window_number);

                this->owner = v->owner;
                this->tab = TDW_TAB_CARGO;
        }

        /**
         * Some data on this window has become invalid.
         * @param data Information about the changed data.
         * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
         */
        void OnInvalidateData(int data = 0, bool gui_scope = true) override
        {
                if (data == VIWD_AUTOREPLACE) {
                        /* Autoreplace replaced the vehicle.
                         * Nothing to do for this window. */
                        return;
                }
                if (!gui_scope) return;
                const Vehicle *v = Vehicle::Get(this->window_number);
                if (v->type == VEH_ROAD) {
                        const NWidgetBase *nwid_info = this->GetWidget<NWidgetBase>(WID_VD_MIDDLE_DETAILS);
                        uint aimed_height = this->GetRoadVehDetailsHeight(v);
                        /* If the number of articulated parts changes, the size of the window must change too. */
                        if (aimed_height != nwid_info->current_y) {
                                this->ReInit();
                        }
                }
        }

        /**
         * Gets the desired height for the road vehicle details panel.
         * @param v Road vehicle being shown.
         * @return Desired height in pixels.
         */
        uint GetRoadVehDetailsHeight(const Vehicle *v)
        {
                uint desired_height;
                if (v->HasArticulatedPart()) {
                        /* An articulated RV has its text drawn under the sprite instead of after it, hence 15 pixels extra. */
                        desired_height = WD_FRAMERECT_TOP + ScaleGUITrad(15) + 3 * FONT_HEIGHT_NORMAL + 2 + WD_FRAMERECT_BOTTOM;
                        /* Add space for the cargo amount for each part. */
                        for (const Vehicle *u = v; u != nullptr; u = u->Next()) {
                                if (u->cargo_cap != 0) desired_height += FONT_HEIGHT_NORMAL + 1;
                        }
                } else {
                        desired_height = WD_FRAMERECT_TOP + 4 * FONT_HEIGHT_NORMAL + 3 + WD_FRAMERECT_BOTTOM;
                }
                return desired_height;
        }

        void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
        {
                switch (widget) {
                        case WID_VD_TOP_DETAILS: {
                                Dimension dim = { 0, 0 };
                                size->height = WD_FRAMERECT_TOP + 4 * FONT_HEIGHT_NORMAL + WD_FRAMERECT_BOTTOM;

                                for (uint i = 0; i < 4; i++) SetDParamMaxValue(i, INT16_MAX);
                                static const StringID info_strings[] = {
                                        STR_VEHICLE_INFO_MAX_SPEED,
                                        STR_VEHICLE_INFO_WEIGHT_POWER_MAX_SPEED,
                                        STR_VEHICLE_INFO_WEIGHT_POWER_MAX_SPEED_MAX_TE,
                                        STR_VEHICLE_INFO_PROFIT_THIS_YEAR_LAST_YEAR,
                                        STR_VEHICLE_INFO_RELIABILITY_BREAKDOWNS
                                };
                                for (uint i = 0; i < lengthof(info_strings); i++) {
                                        dim = maxdim(dim, GetStringBoundingBox(info_strings[i]));
                                }
                                SetDParam(0, STR_VEHICLE_INFO_AGE);
                                dim = maxdim(dim, GetStringBoundingBox(STR_VEHICLE_INFO_AGE_RUNNING_COST_YR));
                                size->width = dim.width + WD_FRAMERECT_LEFT + WD_FRAMERECT_RIGHT;
                                break;
                        }

                        case WID_VD_MIDDLE_DETAILS: {
                                const Vehicle *v = Vehicle::Get(this->window_number);
                                switch (v->type) {
                                        case VEH_ROAD:
                                                size->height = this->GetRoadVehDetailsHeight(v);
                                                break;

                                        case VEH_SHIP:
                                                size->height = WD_FRAMERECT_TOP + 4 * FONT_HEIGHT_NORMAL + 3 + WD_FRAMERECT_BOTTOM;
                                                break;

                                        case VEH_AIRCRAFT:
                                                size->height = WD_FRAMERECT_TOP + 5 * FONT_HEIGHT_NORMAL + 4 + WD_FRAMERECT_BOTTOM;
                                                break;

                                        default:
                                                NOT_REACHED(); // Train uses WID_VD_MATRIX instead.
                                }
                                break;
                        }

                        case WID_VD_MATRIX:
                                resize->height = std::max(ScaleGUITrad(14), WD_MATRIX_TOP + FONT_HEIGHT_NORMAL + WD_MATRIX_BOTTOM);
                                size->height = 4 * resize->height;
                                break;

                        case WID_VD_SERVICE_INTERVAL_DROPDOWN: {
                                StringID *strs = _service_interval_dropdown;
                                while (*strs != INVALID_STRING_ID) {
                                        *size = maxdim(*size, GetStringBoundingBox(*strs++));
                                }
                                size->width += padding.width;
                                size->height = FONT_HEIGHT_NORMAL + WD_DROPDOWNTEXT_TOP + WD_DROPDOWNTEXT_BOTTOM;
                                break;
                        }

                        case WID_VD_SERVICING_INTERVAL:
                                SetDParamMaxValue(0, MAX_SERVINT_DAYS); // Roughly the maximum interval
                                SetDParamMaxValue(1, MAX_YEAR * DAYS_IN_YEAR); // Roughly the maximum year
                                size->width = std::max(
                                        GetStringBoundingBox(STR_VEHICLE_DETAILS_SERVICING_INTERVAL_PERCENT).width,
                                        GetStringBoundingBox(STR_VEHICLE_DETAILS_SERVICING_INTERVAL_DAYS).width
                                ) + WD_FRAMERECT_LEFT + WD_FRAMERECT_RIGHT;
                                size->height = WD_FRAMERECT_TOP + FONT_HEIGHT_NORMAL + WD_FRAMERECT_BOTTOM;
                                break;
                }
        }

        /** Checks whether service interval is enabled for the vehicle. */
        static bool IsVehicleServiceIntervalEnabled(const VehicleType vehicle_type, CompanyID company_id)
        {
                const VehicleDefaultSettings *vds = &Company::Get(company_id)->settings.vehicle;
                switch (vehicle_type) {
                        default: NOT_REACHED();
                        case VEH_TRAIN:    return vds->servint_trains   != 0;
                        case VEH_ROAD:     return vds->servint_roadveh  != 0;
                        case VEH_SHIP:     return vds->servint_ships    != 0;
                        case VEH_AIRCRAFT: return vds->servint_aircraft != 0;
                }
        }

        /**
         * Draw the details for the given vehicle at the position of the Details windows
         *
         * @param v     current vehicle
         * @param left  The left most coordinate to draw
         * @param right The right most coordinate to draw
         * @param y     The y coordinate
         * @param vscroll_pos Position of scrollbar (train only)
         * @param vscroll_cap Number of lines currently displayed (train only)
         * @param det_tab Selected details tab (train only)
         */
        static void DrawVehicleDetails(const Vehicle *v, int left, int right, int y, int vscroll_pos, uint vscroll_cap, TrainDetailsWindowTabs det_tab)
        {
                switch (v->type) {
                        case VEH_TRAIN:    DrawTrainDetails(Train::From(v), left, right, y, vscroll_pos, vscroll_cap, det_tab);  break;
                        case VEH_ROAD:     DrawRoadVehDetails(v, left, right, y);  break;
                        case VEH_SHIP:     DrawShipDetails(v, left, right, y);     break;
                        case VEH_AIRCRAFT: DrawAircraftDetails(Aircraft::From(v), left, right, y); break;
                        default: NOT_REACHED();
                }
        }

        void SetStringParameters(int widget) const override
        {
                if (widget == WID_VD_CAPTION) SetDParam(0, Vehicle::Get(this->window_number)->index);
        }

        void DrawWidget(const Rect &r, int widget) const override
        {
                const Vehicle *v = Vehicle::Get(this->window_number);

                switch (widget) {
                        case WID_VD_TOP_DETAILS: {
                                int y = r.top + WD_FRAMERECT_TOP;

                                /* Draw running cost */
                                SetDParam(1, v->age / DAYS_IN_LEAP_YEAR);
                                SetDParam(0, (v->age + DAYS_IN_YEAR < v->max_age) ? STR_VEHICLE_INFO_AGE : STR_VEHICLE_INFO_AGE_RED);
                                SetDParam(2, v->max_age / DAYS_IN_LEAP_YEAR);
                                SetDParam(3, v->GetDisplayRunningCost());
                                DrawString(r.left + WD_FRAMERECT_LEFT, r.right - WD_FRAMERECT_RIGHT, y, STR_VEHICLE_INFO_AGE_RUNNING_COST_YR);
                                y += FONT_HEIGHT_NORMAL;

                                /* Draw max speed */
                                StringID string;
                                if (v->type == VEH_TRAIN ||
                                                (v->type == VEH_ROAD && _settings_game.vehicle.roadveh_acceleration_model != AM_ORIGINAL)) {
                                        const GroundVehicleCache *gcache = v->GetGroundVehicleCache();
                                        SetDParam(2, v->GetDisplayMaxSpeed());
                                        SetDParam(1, gcache->cached_power);
                                        SetDParam(0, gcache->cached_weight);
                                        SetDParam(3, gcache->cached_max_te / 1000);
                                        if (v->type == VEH_TRAIN && (_settings_game.vehicle.train_acceleration_model == AM_ORIGINAL ||
                                                        GetRailTypeInfo(Train::From(v)->railtype)->acceleration_type == 2)) {
                                                string = STR_VEHICLE_INFO_WEIGHT_POWER_MAX_SPEED;
                                        } else {
                                                string = STR_VEHICLE_INFO_WEIGHT_POWER_MAX_SPEED_MAX_TE;
                                        }
                                } else {
                                        SetDParam(0, v->GetDisplayMaxSpeed());
                                        if (v->type == VEH_AIRCRAFT) {
                                                SetDParam(1, v->GetEngine()->GetAircraftTypeText());
                                                if (Aircraft::From(v)->GetRange() > 0) {
                                                        SetDParam(2, Aircraft::From(v)->GetRange());
                                                        string = STR_VEHICLE_INFO_MAX_SPEED_TYPE_RANGE;
                                                } else {
                                                        string = STR_VEHICLE_INFO_MAX_SPEED_TYPE;
                                                }
                                        } else {
                                                string = STR_VEHICLE_INFO_MAX_SPEED;
                                        }
                                }
                                DrawString(r.left + WD_FRAMERECT_LEFT, r.right - WD_FRAMERECT_RIGHT, y, string);
                                y += FONT_HEIGHT_NORMAL;

                                /* Draw profit */
                                SetDParam(0, v->GetDisplayProfitThisYear());
                                SetDParam(1, v->GetDisplayProfitLastYear());
                                DrawString(r.left + WD_FRAMERECT_LEFT, r.right - WD_FRAMERECT_RIGHT, y, STR_VEHICLE_INFO_PROFIT_THIS_YEAR_LAST_YEAR);
                                y += FONT_HEIGHT_NORMAL;

                                /* Draw breakdown & reliability */
                                SetDParam(0, ToPercent16(v->reliability));
                                SetDParam(1, v->breakdowns_since_last_service);
                                DrawString(r.left + WD_FRAMERECT_LEFT, r.right - WD_FRAMERECT_RIGHT, y, STR_VEHICLE_INFO_RELIABILITY_BREAKDOWNS);
                                break;
                        }

                        case WID_VD_MATRIX:
                                /* For trains only. */
                                DrawVehicleDetails(v, r.left + WD_MATRIX_LEFT, r.right - WD_MATRIX_RIGHT, r.top + WD_MATRIX_TOP, this->vscroll->GetPosition(), this->vscroll->GetCapacity(), this->tab);
                                break;

                        case WID_VD_MIDDLE_DETAILS: {
                                /* For other vehicles, at the place of the matrix. */
                                bool rtl = _current_text_dir == TD_RTL;
                                uint sprite_width = GetSingleVehicleWidth(v, EIT_IN_DETAILS) + WD_FRAMERECT_LEFT + WD_FRAMERECT_RIGHT;

                                uint text_left  = r.left  + (rtl ? 0 : sprite_width);
                                uint text_right = r.right - (rtl ? sprite_width : 0);

                                /* Articulated road vehicles use a complete line. */
                                if (v->type == VEH_ROAD && v->HasArticulatedPart()) {
                                        DrawVehicleImage(v, r.left + WD_FRAMERECT_LEFT, r.right - WD_FRAMERECT_RIGHT, r.top + WD_FRAMERECT_TOP, INVALID_VEHICLE, EIT_IN_DETAILS, 0);
                                } else {
                                        uint sprite_left  = rtl ? text_right : r.left;
                                        uint sprite_right = rtl ? r.right : text_left;

                                        DrawVehicleImage(v, sprite_left + WD_FRAMERECT_LEFT, sprite_right - WD_FRAMERECT_RIGHT, r.top + WD_FRAMERECT_TOP, INVALID_VEHICLE, EIT_IN_DETAILS, 0);
                                }
                                DrawVehicleDetails(v, text_left + WD_FRAMERECT_LEFT, text_right - WD_FRAMERECT_RIGHT, r.top + WD_FRAMERECT_TOP, 0, 0, this->tab);
                                break;
                        }

                        case WID_VD_SERVICING_INTERVAL:
                                /* Draw service interval text */
                                SetDParam(0, v->GetServiceInterval());
                                SetDParam(1, v->date_of_last_service);
                                DrawString(r.left + WD_FRAMERECT_LEFT, r.right - WD_FRAMERECT_RIGHT, r.top + (r.bottom - r.top + 1 - FONT_HEIGHT_NORMAL) / 2,
                                                v->ServiceIntervalIsPercent() ? STR_VEHICLE_DETAILS_SERVICING_INTERVAL_PERCENT : STR_VEHICLE_DETAILS_SERVICING_INTERVAL_DAYS);
                                break;
                }
        }

        /** Repaint vehicle details window. */
        void OnPaint() override
        {
                const Vehicle *v = Vehicle::Get(this->window_number);

                if (v->type == VEH_TRAIN) {
                        this->DisableWidget(this->tab + WID_VD_DETAILS_CARGO_CARRIED);
                        this->vscroll->SetCount(GetTrainDetailsWndVScroll(v->index, this->tab));
                }

                /* Disable service-scroller when interval is set to disabled */
                this->SetWidgetsDisabledState(!IsVehicleServiceIntervalEnabled(v->type, v->owner),
                        WID_VD_INCREASE_SERVICING_INTERVAL,
                        WID_VD_DECREASE_SERVICING_INTERVAL,
                        WIDGET_LIST_END);

                StringID str = v->ServiceIntervalIsCustom() ?
                        (v->ServiceIntervalIsPercent() ? STR_VEHICLE_DETAILS_PERCENT : STR_VEHICLE_DETAILS_DAYS) :
                        STR_VEHICLE_DETAILS_DEFAULT;
                this->GetWidget<NWidgetCore>(WID_VD_SERVICE_INTERVAL_DROPDOWN)->widget_data = str;

                this->DrawWidgets();
        }

        void OnClick(Point pt, int widget, int click_count) override
        {
                switch (widget) {
                        case WID_VD_INCREASE_SERVICING_INTERVAL:   // increase int
                        case WID_VD_DECREASE_SERVICING_INTERVAL: { // decrease int
                                int mod = _ctrl_pressed ? 5 : 10;
                                const Vehicle *v = Vehicle::Get(this->window_number);

                                mod = (widget == WID_VD_DECREASE_SERVICING_INTERVAL) ? -mod : mod;
                                mod = GetServiceIntervalClamped(mod + v->GetServiceInterval(), v->ServiceIntervalIsPercent());
                                if (mod == v->GetServiceInterval()) return;

                                Command<CMD_CHANGE_SERVICE_INT>::Post(STR_ERROR_CAN_T_CHANGE_SERVICING, v->index, mod, true, v->ServiceIntervalIsPercent());
                                break;
                        }

                        case WID_VD_SERVICE_INTERVAL_DROPDOWN: {
                                const Vehicle *v = Vehicle::Get(this->window_number);
                                ShowDropDownMenu(this, _service_interval_dropdown, v->ServiceIntervalIsCustom() ? (v->ServiceIntervalIsPercent() ? 2 : 1) : 0, widget, 0, 0);
                                break;
                        }

                        case WID_VD_DETAILS_CARGO_CARRIED:
                        case WID_VD_DETAILS_TRAIN_VEHICLES:
                        case WID_VD_DETAILS_CAPACITY_OF_EACH:
                        case WID_VD_DETAILS_TOTAL_CARGO:
                                this->SetWidgetsDisabledState(false,
                                        WID_VD_DETAILS_CARGO_CARRIED,
                                        WID_VD_DETAILS_TRAIN_VEHICLES,
                                        WID_VD_DETAILS_CAPACITY_OF_EACH,
                                        WID_VD_DETAILS_TOTAL_CARGO,
                                        widget,
                                        WIDGET_LIST_END);

                                this->tab = (TrainDetailsWindowTabs)(widget - WID_VD_DETAILS_CARGO_CARRIED);
                                this->SetDirty();
                                break;
                }
        }

        void OnDropdownSelect(int widget, int index) override
        {
                switch (widget) {
                        case WID_VD_SERVICE_INTERVAL_DROPDOWN: {
                                const Vehicle *v = Vehicle::Get(this->window_number);
                                bool iscustom = index != 0;
                                bool ispercent = iscustom ? (index == 2) : Company::Get(v->owner)->settings.vehicle.servint_ispercent;
                                uint16 interval = GetServiceIntervalClamped(v->GetServiceInterval(), ispercent);
                                Command<CMD_CHANGE_SERVICE_INT>::Post(STR_ERROR_CAN_T_CHANGE_SERVICING, v->index, interval, iscustom, ispercent);
                                break;
                        }
                }
        }

        void OnResize() override
        {
                NWidgetCore *nwi = this->GetWidget<NWidgetCore>(WID_VD_MATRIX);
                if (nwi != nullptr) {
                        this->vscroll->SetCapacityFromWidget(this, WID_VD_MATRIX);
                }
        }
};

/** Vehicle details window descriptor. */
static WindowDesc _train_vehicle_details_desc(
        WDP_AUTO, "view_vehicle_details_train", 405, 178,
        WC_VEHICLE_DETAILS, WC_VEHICLE_VIEW,
        0,
        _nested_train_vehicle_details_widgets, lengthof(_nested_train_vehicle_details_widgets)
);

/** Vehicle details window descriptor for other vehicles than a train. */
static WindowDesc _nontrain_vehicle_details_desc(
        WDP_AUTO, "view_vehicle_details", 405, 113,
        WC_VEHICLE_DETAILS, WC_VEHICLE_VIEW,
        0,
        _nested_nontrain_vehicle_details_widgets, lengthof(_nested_nontrain_vehicle_details_widgets)
);

/** Shows the vehicle details window of the given vehicle. */
static void ShowVehicleDetailsWindow(const Vehicle *v)
{
        CloseWindowById(WC_VEHICLE_ORDERS, v->index, false);
        CloseWindowById(WC_VEHICLE_TIMETABLE, v->index, false);
        AllocateWindowDescFront<VehicleDetailsWindow>((v->type == VEH_TRAIN) ? &_train_vehicle_details_desc : &_nontrain_vehicle_details_desc, v->index);
}


/* Unified vehicle GUI - Vehicle View Window */

/** Vehicle view widgets. */
static const NWidgetPart _nested_vehicle_view_widgets[] = {
        NWidget(NWID_HORIZONTAL),
                NWidget(WWT_CLOSEBOX, COLOUR_GREY),
                NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, WID_VV_RENAME), SetMinimalSize(12, 14), SetDataTip(SPR_RENAME, STR_NULL /* filled in later */),
                NWidget(WWT_CAPTION, COLOUR_GREY, WID_VV_CAPTION), SetDataTip(STR_VEHICLE_VIEW_CAPTION, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS),
                NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, WID_VV_LOCATION), SetMinimalSize(12, 14), SetDataTip(SPR_GOTO_LOCATION, STR_NULL /* filled in later */),
                NWidget(WWT_DEBUGBOX, COLOUR_GREY),
                NWidget(WWT_SHADEBOX, COLOUR_GREY),
                NWidget(WWT_DEFSIZEBOX, COLOUR_GREY),
                NWidget(WWT_STICKYBOX, COLOUR_GREY),
        EndContainer(),
        NWidget(NWID_HORIZONTAL),
                NWidget(WWT_PANEL, COLOUR_GREY),
                        NWidget(WWT_INSET, COLOUR_GREY), SetPadding(2, 2, 2, 2),
                                NWidget(NWID_VIEWPORT, INVALID_COLOUR, WID_VV_VIEWPORT), SetMinimalSize(226, 84), SetResize(1, 1),
                        EndContainer(),
                EndContainer(),
                NWidget(NWID_VERTICAL),
                        NWidget(NWID_SELECTION, INVALID_COLOUR, WID_VV_SELECT_DEPOT_CLONE),
                                NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, WID_VV_GOTO_DEPOT), SetMinimalSize(18, 18), SetDataTip(0x0 /* filled later */, 0x0 /* filled later */),
                                NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, WID_VV_CLONE), SetMinimalSize(18, 18), SetDataTip(0x0 /* filled later */, 0x0 /* filled later */),
                        EndContainer(),
                        /* For trains only, 'ignore signal' button. */
                        NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, WID_VV_FORCE_PROCEED), SetMinimalSize(18, 18),
                                                                                        SetDataTip(SPR_IGNORE_SIGNALS, STR_VEHICLE_VIEW_TRAIN_IGNORE_SIGNAL_TOOLTIP),
                        NWidget(NWID_SELECTION, INVALID_COLOUR, WID_VV_SELECT_REFIT_TURN),
                                NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, WID_VV_REFIT), SetMinimalSize(18, 18), SetDataTip(SPR_REFIT_VEHICLE, 0x0 /* filled later */),
                                NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, WID_VV_TURN_AROUND), SetMinimalSize(18, 18),
                                                                                                SetDataTip(SPR_FORCE_VEHICLE_TURN, STR_VEHICLE_VIEW_ROAD_VEHICLE_REVERSE_TOOLTIP),
                        EndContainer(),
                        NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, WID_VV_SHOW_ORDERS), SetMinimalSize(18, 18), SetDataTip(SPR_SHOW_ORDERS, 0x0 /* filled later */),
                        NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, WID_VV_SHOW_DETAILS), SetMinimalSize(18, 18), SetDataTip(SPR_SHOW_VEHICLE_DETAILS, 0x0 /* filled later */),
                        NWidget(WWT_PANEL, COLOUR_GREY), SetMinimalSize(18, 0), SetResize(0, 1), EndContainer(),
                EndContainer(),
        EndContainer(),
        NWidget(NWID_HORIZONTAL),
                NWidget(WWT_PUSHBTN, COLOUR_GREY, WID_VV_START_STOP), SetMinimalTextLines(1, WD_FRAMERECT_TOP + WD_FRAMERECT_BOTTOM + 2), SetResize(1, 0), SetFill(1, 0),
                NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, WID_VV_ORDER_LOCATION), SetMinimalSize(12, 14), SetDataTip(SPR_GOTO_LOCATION, STR_VEHICLE_VIEW_ORDER_LOCATION_TOOLTIP),
                NWidget(WWT_RESIZEBOX, COLOUR_GREY),
        EndContainer(),
};

/** Vehicle view window descriptor for all vehicles but trains. */
static WindowDesc _vehicle_view_desc(
        WDP_AUTO, "view_vehicle", 250, 116,
        WC_VEHICLE_VIEW, WC_NONE,
        0,
        _nested_vehicle_view_widgets, lengthof(_nested_vehicle_view_widgets)
);

/**
 * Vehicle view window descriptor for trains. Only minimum_height and
 *  default_height are different for train view.
 */
static WindowDesc _train_view_desc(
        WDP_AUTO, "view_vehicle_train", 250, 134,
        WC_VEHICLE_VIEW, WC_NONE,
        0,
        _nested_vehicle_view_widgets, lengthof(_nested_vehicle_view_widgets)
);


/* Just to make sure, nobody has changed the vehicle type constants, as we are
         using them for array indexing in a number of places here. */
static_assert(VEH_TRAIN == 0);
static_assert(VEH_ROAD == 1);
static_assert(VEH_SHIP == 2);
static_assert(VEH_AIRCRAFT == 3);

/** Zoom levels for vehicle views indexed by vehicle type. */
static const ZoomLevel _vehicle_view_zoom_levels[] = {
        ZOOM_LVL_TRAIN,
        ZOOM_LVL_ROADVEH,
        ZOOM_LVL_SHIP,
        ZOOM_LVL_AIRCRAFT,
};

/* Constants for geometry of vehicle view viewport */
static const int VV_INITIAL_VIEWPORT_WIDTH = 226;
static const int VV_INITIAL_VIEWPORT_HEIGHT = 84;
static const int VV_INITIAL_VIEWPORT_HEIGHT_TRAIN = 102;

/** Command indices for the _vehicle_command_translation_table. */
enum VehicleCommandTranslation {
        VCT_CMD_START_STOP = 0,
        VCT_CMD_CLONE_VEH,
        VCT_CMD_TURN_AROUND,
};

/** Command codes for the shared buttons indexed by VehicleCommandTranslation and vehicle type. */
static const StringID _vehicle_msg_translation_table[][4] = {
        { // VCT_CMD_START_STOP
                STR_ERROR_CAN_T_STOP_START_TRAIN,
                STR_ERROR_CAN_T_STOP_START_ROAD_VEHICLE,
                STR_ERROR_CAN_T_STOP_START_SHIP,
                STR_ERROR_CAN_T_STOP_START_AIRCRAFT
        },
        { // VCT_CMD_CLONE_VEH
                STR_ERROR_CAN_T_BUY_TRAIN,
                STR_ERROR_CAN_T_BUY_ROAD_VEHICLE,
                STR_ERROR_CAN_T_BUY_SHIP,
                STR_ERROR_CAN_T_BUY_AIRCRAFT
        },
        { // VCT_CMD_TURN_AROUND
                STR_ERROR_CAN_T_REVERSE_DIRECTION_TRAIN,
                STR_ERROR_CAN_T_MAKE_ROAD_VEHICLE_TURN,
                INVALID_STRING_ID, // invalid for ships
                INVALID_STRING_ID  // invalid for aircraft
        },
};

/**
 * This is the Callback method after attempting to start/stop a vehicle
 * @param cmd unused
 * @param result the result of the start/stop command
 * @param veh_id Vehicle ID.
 */
void CcStartStopVehicle(Commands cmd, const CommandCost &result, VehicleID veh_id, bool)
{
        if (result.Failed()) return;

        const Vehicle *v = Vehicle::GetIfValid(veh_id);
        if (v == nullptr || !v->IsPrimaryVehicle() || v->owner != _local_company) return;

        StringID msg = (v->vehstatus & VS_STOPPED) ? STR_VEHICLE_COMMAND_STOPPED : STR_VEHICLE_COMMAND_STARTED;
        Point pt = RemapCoords(v->x_pos, v->y_pos, v->z_pos);
        AddTextEffect(msg, pt.x, pt.y, DAY_TICKS, TE_RISING);
}

/**
 * Executes #CMD_START_STOP_VEHICLE for given vehicle.
 * @param v Vehicle to start/stop
 * @param texteffect Should a texteffect be shown?
 */
void StartStopVehicle(const Vehicle *v, bool texteffect)
{
        assert(v->IsPrimaryVehicle());
        Command<CMD_START_STOP_VEHICLE>::Post(_vehicle_msg_translation_table[VCT_CMD_START_STOP][v->type], texteffect ? CcStartStopVehicle : nullptr, v->tile, v->index, false);
}

/** Checks whether the vehicle may be refitted at the moment.*/
static bool IsVehicleRefitable(const Vehicle *v)
{
        if (!v->IsStoppedInDepot()) return false;

        do {
                if (IsEngineRefittable(v->engine_type)) return true;
        } while (v->IsGroundVehicle() && (v = v->Next()) != nullptr);

        return false;
}

/** Window manager class for viewing a vehicle. */
struct VehicleViewWindow : Window {
private:
        /** Display planes available in the vehicle view window. */
        enum PlaneSelections {
                SEL_DC_GOTO_DEPOT,  ///< Display 'goto depot' button in #WID_VV_SELECT_DEPOT_CLONE stacked widget.
                SEL_DC_CLONE,       ///< Display 'clone vehicle' button in #WID_VV_SELECT_DEPOT_CLONE stacked widget.

                SEL_RT_REFIT,       ///< Display 'refit' button in #WID_VV_SELECT_REFIT_TURN stacked widget.
                SEL_RT_TURN_AROUND, ///< Display 'turn around' button in #WID_VV_SELECT_REFIT_TURN stacked widget.

                SEL_DC_BASEPLANE = SEL_DC_GOTO_DEPOT, ///< First plane of the #WID_VV_SELECT_DEPOT_CLONE stacked widget.
                SEL_RT_BASEPLANE = SEL_RT_REFIT,      ///< First plane of the #WID_VV_SELECT_REFIT_TURN stacked widget.
        };
        bool mouse_over_start_stop = false;

        /**
         * Display a plane in the window.
         * @param plane Plane to show.
         */
        void SelectPlane(PlaneSelections plane)
        {
                switch (plane) {
                        case SEL_DC_GOTO_DEPOT:
                        case SEL_DC_CLONE:
                                this->GetWidget<NWidgetStacked>(WID_VV_SELECT_DEPOT_CLONE)->SetDisplayedPlane(plane - SEL_DC_BASEPLANE);
                                break;

                        case SEL_RT_REFIT:
                        case SEL_RT_TURN_AROUND:
                                this->GetWidget<NWidgetStacked>(WID_VV_SELECT_REFIT_TURN)->SetDisplayedPlane(plane - SEL_RT_BASEPLANE);
                                break;

                        default:
                                NOT_REACHED();
                }
        }

public:
        VehicleViewWindow(WindowDesc *desc, WindowNumber window_number) : Window(desc)
        {
                this->flags |= WF_DISABLE_VP_SCROLL;
                this->CreateNestedTree();

                /* Sprites for the 'send to depot' button indexed by vehicle type. */
                static const SpriteID vehicle_view_goto_depot_sprites[] = {
                        SPR_SEND_TRAIN_TODEPOT,
                        SPR_SEND_ROADVEH_TODEPOT,
                        SPR_SEND_SHIP_TODEPOT,
                        SPR_SEND_AIRCRAFT_TODEPOT,
                };
                const Vehicle *v = Vehicle::Get(window_number);
                this->GetWidget<NWidgetCore>(WID_VV_GOTO_DEPOT)->widget_data = vehicle_view_goto_depot_sprites[v->type];

                /* Sprites for the 'clone vehicle' button indexed by vehicle type. */
                static const SpriteID vehicle_view_clone_sprites[] = {
                        SPR_CLONE_TRAIN,
                        SPR_CLONE_ROADVEH,
                        SPR_CLONE_SHIP,
                        SPR_CLONE_AIRCRAFT,
                };
                this->GetWidget<NWidgetCore>(WID_VV_CLONE)->widget_data = vehicle_view_clone_sprites[v->type];

                switch (v->type) {
                        case VEH_TRAIN:
                                this->GetWidget<NWidgetCore>(WID_VV_TURN_AROUND)->tool_tip = STR_VEHICLE_VIEW_TRAIN_REVERSE_TOOLTIP;
                                break;

                        case VEH_ROAD:
                                break;

                        case VEH_SHIP:
                        case VEH_AIRCRAFT:
                                this->SelectPlane(SEL_RT_REFIT);
                                break;

                        default: NOT_REACHED();
                }
                this->FinishInitNested(window_number);
                this->owner = v->owner;
                this->GetWidget<NWidgetViewport>(WID_VV_VIEWPORT)->InitializeViewport(this, this->window_number | (1 << 31), _vehicle_view_zoom_levels[v->type]);

                this->GetWidget<NWidgetCore>(WID_VV_START_STOP)->tool_tip       = STR_VEHICLE_VIEW_TRAIN_STATUS_START_STOP_TOOLTIP + v->type;
                this->GetWidget<NWidgetCore>(WID_VV_RENAME)->tool_tip           = STR_VEHICLE_DETAILS_TRAIN_RENAME + v->type;
                this->GetWidget<NWidgetCore>(WID_VV_LOCATION)->tool_tip         = STR_VEHICLE_VIEW_TRAIN_CENTER_TOOLTIP + v->type;
                this->GetWidget<NWidgetCore>(WID_VV_REFIT)->tool_tip            = STR_VEHICLE_VIEW_TRAIN_REFIT_TOOLTIP + v->type;
                this->GetWidget<NWidgetCore>(WID_VV_GOTO_DEPOT)->tool_tip       = STR_VEHICLE_VIEW_TRAIN_SEND_TO_DEPOT_TOOLTIP + v->type;
                this->GetWidget<NWidgetCore>(WID_VV_SHOW_ORDERS)->tool_tip      = STR_VEHICLE_VIEW_TRAIN_ORDERS_TOOLTIP + v->type;
                this->GetWidget<NWidgetCore>(WID_VV_SHOW_DETAILS)->tool_tip     = STR_VEHICLE_VIEW_TRAIN_SHOW_DETAILS_TOOLTIP + v->type;
                this->GetWidget<NWidgetCore>(WID_VV_CLONE)->tool_tip            = STR_VEHICLE_VIEW_CLONE_TRAIN_INFO + v->type;

                this->UpdateButtonStatus();
        }

        void Close() override
        {
                CloseWindowById(WC_VEHICLE_ORDERS, this->window_number, false);
                CloseWindowById(WC_VEHICLE_REFIT, this->window_number, false);
                CloseWindowById(WC_VEHICLE_DETAILS, this->window_number, false);
                CloseWindowById(WC_VEHICLE_TIMETABLE, this->window_number, false);
                this->Window::Close();
        }

        void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
        {
                const Vehicle *v = Vehicle::Get(this->window_number);
                switch (widget) {
                        case WID_VV_START_STOP:
                                size->height = std::max({size->height, GetSpriteSize(SPR_WARNING_SIGN).height, GetSpriteSize(SPR_FLAG_VEH_STOPPED).height, GetSpriteSize(SPR_FLAG_VEH_RUNNING).height}) + WD_IMGBTN_TOP + WD_IMGBTN_BOTTOM;
                                break;

                        case WID_VV_FORCE_PROCEED:
                                if (v->type != VEH_TRAIN) {
                                        size->height = 0;
                                        size->width = 0;
                                }
                                break;

                        case WID_VV_VIEWPORT:
                                size->width = VV_INITIAL_VIEWPORT_WIDTH;
                                size->height = (v->type == VEH_TRAIN) ? VV_INITIAL_VIEWPORT_HEIGHT_TRAIN : VV_INITIAL_VIEWPORT_HEIGHT;
                                break;
                }
        }

        void OnPaint() override
        {
                const Vehicle *v = Vehicle::Get(this->window_number);
                bool is_localcompany = v->owner == _local_company;
                bool refitable_and_stopped_in_depot = IsVehicleRefitable(v);

                this->SetWidgetDisabledState(WID_VV_RENAME, !is_localcompany);
                this->SetWidgetDisabledState(WID_VV_GOTO_DEPOT, !is_localcompany);
                this->SetWidgetDisabledState(WID_VV_REFIT, !refitable_and_stopped_in_depot || !is_localcompany);
                this->SetWidgetDisabledState(WID_VV_CLONE, !is_localcompany);

                if (v->type == VEH_TRAIN) {
                        this->SetWidgetLoweredState(WID_VV_FORCE_PROCEED, Train::From(v)->force_proceed == TFP_SIGNAL);
                        this->SetWidgetDisabledState(WID_VV_FORCE_PROCEED, !is_localcompany);
                        this->SetWidgetDisabledState(WID_VV_TURN_AROUND, !is_localcompany);
                }

                this->SetWidgetDisabledState(WID_VV_ORDER_LOCATION, v->current_order.GetLocation(v) == INVALID_TILE);

                this->DrawWidgets();
        }

        void SetStringParameters(int widget) const override
        {
                if (widget != WID_VV_CAPTION) return;

                const Vehicle *v = Vehicle::Get(this->window_number);
                SetDParam(0, v->index);
        }

        void DrawWidget(const Rect &r, int widget) const override
        {
                if (widget != WID_VV_START_STOP) return;

                const Vehicle *v = Vehicle::Get(this->window_number);
                StringID str;
                TextColour text_colour = TC_FROMSTRING;
                if (v->vehstatus & VS_CRASHED) {
                        str = STR_VEHICLE_STATUS_CRASHED;
                } else if (v->type != VEH_AIRCRAFT && v->breakdown_ctr == 1) { // check for aircraft necessary?
                        str = STR_VEHICLE_STATUS_BROKEN_DOWN;
                } else if (v->vehstatus & VS_STOPPED && (!mouse_over_start_stop || v->IsStoppedInDepot())) {
                        if (v->type == VEH_TRAIN) {
                                if (v->cur_speed == 0) {
                                        if (Train::From(v)->gcache.cached_power == 0) {
                                                str = STR_VEHICLE_STATUS_TRAIN_NO_POWER;
                                        } else {
                                                str = STR_VEHICLE_STATUS_STOPPED;
                                        }
                                } else {
                                        SetDParam(0, v->GetDisplaySpeed());
                                        str = STR_VEHICLE_STATUS_TRAIN_STOPPING_VEL;
                                }
                        } else { // no train
                                str = STR_VEHICLE_STATUS_STOPPED;
                        }
                } else if (v->type == VEH_TRAIN && HasBit(Train::From(v)->flags, VRF_TRAIN_STUCK) && !v->current_order.IsType(OT_LOADING)) {
                        str = STR_VEHICLE_STATUS_TRAIN_STUCK;
                } else if (v->type == VEH_AIRCRAFT && HasBit(Aircraft::From(v)->flags, VAF_DEST_TOO_FAR) && !v->current_order.IsType(OT_LOADING)) {
                        str = STR_VEHICLE_STATUS_AIRCRAFT_TOO_FAR;
                } else { // vehicle is in a "normal" state, show current order
                        if (mouse_over_start_stop) {
                                if (v->vehstatus & VS_STOPPED) {
                                        text_colour = TC_RED | TC_FORCED;
                                } else if (v->type == VEH_TRAIN && HasBit(Train::From(v)->flags, VRF_TRAIN_STUCK) && !v->current_order.IsType(OT_LOADING)) {
                                        text_colour = TC_ORANGE | TC_FORCED;
                                }
                        }
                        switch (v->current_order.GetType()) {
                                case OT_GOTO_STATION: {
                                        SetDParam(0, v->current_order.GetDestination());
                                        SetDParam(1, v->GetDisplaySpeed());
                                        str = HasBit(v->vehicle_flags, VF_PATHFINDER_LOST) ? STR_VEHICLE_STATUS_CANNOT_REACH_STATION_VEL : STR_VEHICLE_STATUS_HEADING_FOR_STATION_VEL;
                                        break;
                                }

                                case OT_GOTO_DEPOT: {
                                        SetDParam(0, v->type);
                                        SetDParam(1, v->current_order.GetDestination());
                                        SetDParam(2, v->GetDisplaySpeed());
                                        if (v->current_order.GetDepotActionType() & ODATFB_NEAREST_DEPOT) {
                                                /* This case *only* happens when multiple nearest depot orders
                                                 * follow each other (including an order list only one order: a
                                                 * nearest depot order) and there are no reachable depots.
                                                 * It is primarily to guard for the case that there is no
                                                 * depot with index 0, which would be used as fallback for
                                                 * evaluating the string in the status bar. */
                                                str = STR_EMPTY;
                                        } else if (v->current_order.GetDepotActionType() & ODATFB_HALT) {
                                                str = HasBit(v->vehicle_flags, VF_PATHFINDER_LOST) ? STR_VEHICLE_STATUS_CANNOT_REACH_DEPOT_VEL : STR_VEHICLE_STATUS_HEADING_FOR_DEPOT_VEL;
                                        } else {
                                                str = HasBit(v->vehicle_flags, VF_PATHFINDER_LOST) ? STR_VEHICLE_STATUS_CANNOT_REACH_DEPOT_SERVICE_VEL : STR_VEHICLE_STATUS_HEADING_FOR_DEPOT_SERVICE_VEL;
                                        }
                                        break;
                                }

                                case OT_LOADING:
                                        str = STR_VEHICLE_STATUS_LOADING_UNLOADING;
                                        break;

                                case OT_GOTO_WAYPOINT: {
                                        assert(v->type == VEH_TRAIN || v->type == VEH_SHIP);
                                        SetDParam(0, v->current_order.GetDestination());
                                        str = HasBit(v->vehicle_flags, VF_PATHFINDER_LOST) ? STR_VEHICLE_STATUS_CANNOT_REACH_WAYPOINT_VEL : STR_VEHICLE_STATUS_HEADING_FOR_WAYPOINT_VEL;
                                        SetDParam(1, v->GetDisplaySpeed());
                                        break;
                                }

                                case OT_LEAVESTATION:
                                        if (v->type != VEH_AIRCRAFT) {
                                                str = STR_VEHICLE_STATUS_LEAVING;
                                                break;
                                        }
                                        FALLTHROUGH;
                                default:
                                        if (v->GetNumManualOrders() == 0) {
                                                str = STR_VEHICLE_STATUS_NO_ORDERS_VEL;
                                                SetDParam(0, v->GetDisplaySpeed());
                                        } else {
                                                str = STR_EMPTY;
                                        }
                                        break;
                        }
                }

                /* Draw the flag plus orders. */
                bool rtl = (_current_text_dir == TD_RTL);
                uint text_offset = std::max({GetSpriteSize(SPR_WARNING_SIGN).width, GetSpriteSize(SPR_FLAG_VEH_STOPPED).width, GetSpriteSize(SPR_FLAG_VEH_RUNNING).width}) + WD_IMGBTN_LEFT + WD_IMGBTN_RIGHT;
                int height = r.bottom - r.top;
                int text_left = r.left + (rtl ? (uint)WD_FRAMERECT_LEFT : text_offset);
                int text_right = r.right - (rtl ? text_offset : (uint)WD_FRAMERECT_RIGHT);
                int text_top = r.top + WD_FRAMERECT_TOP + (height - WD_FRAMERECT_TOP - WD_FRAMERECT_BOTTOM - FONT_HEIGHT_NORMAL) / 2;
                int image = ((v->vehstatus & VS_STOPPED) != 0) ? SPR_FLAG_VEH_STOPPED : (HasBit(v->vehicle_flags, VF_PATHFINDER_LOST)) ? SPR_WARNING_SIGN : SPR_FLAG_VEH_RUNNING;
                int image_left = (rtl ? text_right + 1 : r.left) + WD_IMGBTN_LEFT;
                int image_top = r.top + WD_IMGBTN_TOP + (height - WD_IMGBTN_TOP + WD_IMGBTN_BOTTOM - GetSpriteSize(image).height) / 2;
                int lowered = this->IsWidgetLowered(WID_VV_START_STOP) ? 1 : 0;
                DrawSprite(image, PAL_NONE, image_left + lowered, image_top + lowered);
                DrawString(text_left + lowered, text_right + lowered, text_top + lowered, str, text_colour, SA_HOR_CENTER);
        }

        void OnClick(Point pt, int widget, int click_count) override
        {
                const Vehicle *v = Vehicle::Get(this->window_number);

                switch (widget) {
                        case WID_VV_RENAME: { // rename
                                SetDParam(0, v->index);
                                ShowQueryString(STR_VEHICLE_NAME, STR_QUERY_RENAME_TRAIN_CAPTION + v->type,
                                                MAX_LENGTH_VEHICLE_NAME_CHARS, this, CS_ALPHANUMERAL, QSF_ENABLE_DEFAULT | QSF_LEN_IN_CHARS);
                                break;
                        }

                        case WID_VV_START_STOP: // start stop
                                StartStopVehicle(v, false);
                                break;

                        case WID_VV_ORDER_LOCATION: {
                                /* Scroll to current order destination */
                                TileIndex tile = v->current_order.GetLocation(v);
                                if (tile == INVALID_TILE) break;

                                if (_ctrl_pressed) {
                                        ShowExtraViewportWindow(tile);
                                } else {
                                        ScrollMainWindowToTile(tile);
                                }
                                break;
                        }

                        case WID_VV_LOCATION: // center main view
                                if (_ctrl_pressed) {
                                        ShowExtraViewportWindow(TileVirtXY(v->x_pos, v->y_pos));
                                } else {
                                        const Window *mainwindow = FindWindowById(WC_MAIN_WINDOW, 0);
                                        if (click_count > 1 && mainwindow->viewport->zoom <= ZOOM_LVL_OUT_4X) {
                                                /* main window 'follows' vehicle */
                                                mainwindow->viewport->follow_vehicle = v->index;
                                        } else {
                                                ScrollMainWindowTo(v->x_pos, v->y_pos, v->z_pos);
                                        }
                                }
                                break;

                        case WID_VV_GOTO_DEPOT: // goto hangar
                                Command<CMD_SEND_VEHICLE_TO_DEPOT>::Post(GetCmdSendToDepotMsg(v), v->index, _ctrl_pressed ? DepotCommand::Service : DepotCommand::None, {});
                                break;
                        case WID_VV_REFIT: // refit
                                ShowVehicleRefitWindow(v, INVALID_VEH_ORDER_ID, this);
                                break;
                        case WID_VV_SHOW_ORDERS: // show orders
                                if (_ctrl_pressed) {
                                        ShowTimetableWindow(v);
                                } else {
                                        ShowOrdersWindow(v);
                                }
                                break;
                        case WID_VV_SHOW_DETAILS: // show details
                                if (_ctrl_pressed) {
                                        ShowCompanyGroupForVehicle(v);
                                } else {
                                        ShowVehicleDetailsWindow(v);
                                }
                                break;
                        case WID_VV_CLONE: // clone vehicle
                                /* Suppress the vehicle GUI when share-cloning.
                                 * There is no point to it except for starting the vehicle.
                                 * For starting the vehicle the player has to open the depot GUI, which is
                                 * most likely already open, but is also visible in the vehicle viewport. */
                                Command<CMD_CLONE_VEHICLE>::Post(_vehicle_msg_translation_table[VCT_CMD_CLONE_VEH][v->type],
                                                                                _ctrl_pressed ? nullptr : CcCloneVehicle,
                                                                                v->tile, v->index, _ctrl_pressed);
                                break;
                        case WID_VV_TURN_AROUND: // turn around
                                assert(v->IsGroundVehicle());
                                if (v->type == VEH_ROAD) {
                                        Command<CMD_TURN_ROADVEH>::Post(_vehicle_msg_translation_table[VCT_CMD_TURN_AROUND][v->type], v->tile, v->index);
                                } else {
                                        Command<CMD_REVERSE_TRAIN_DIRECTION>::Post(_vehicle_msg_translation_table[VCT_CMD_TURN_AROUND][v->type], v->tile, v->index, false);
                                }
                                break;
                        case WID_VV_FORCE_PROCEED: // force proceed
                                assert(v->type == VEH_TRAIN);
                                Command<CMD_FORCE_TRAIN_PROCEED>::Post(STR_ERROR_CAN_T_MAKE_TRAIN_PASS_SIGNAL, v->tile, v->index);
                                break;
                }
        }

        void OnQueryTextFinished(char *str) override
        {
                if (str == nullptr) return;

                Command<CMD_RENAME_VEHICLE>::Post(STR_ERROR_CAN_T_RENAME_TRAIN + Vehicle::Get(this->window_number)->type, this->window_number, str);
        }

        void OnMouseOver(Point pt, int widget) override
        {
                bool start_stop = widget == WID_VV_START_STOP;
                if (start_stop != mouse_over_start_stop) {
                        mouse_over_start_stop = start_stop;
                        this->SetWidgetDirty(WID_VV_START_STOP);
                }
        }

        void OnResize() override
        {
                if (this->viewport != nullptr) {
                        NWidgetViewport *nvp = this->GetWidget<NWidgetViewport>(WID_VV_VIEWPORT);
                        nvp->UpdateViewportCoordinates(this);
                }
        }

        void UpdateButtonStatus()
        {
                const Vehicle *v = Vehicle::Get(this->window_number);
                bool veh_stopped = v->IsStoppedInDepot();

                /* Widget WID_VV_GOTO_DEPOT must be hidden if the vehicle is already stopped in depot.
                 * Widget WID_VV_CLONE_VEH should then be shown, since cloning is allowed only while in depot and stopped.
                 */
                PlaneSelections plane = veh_stopped ? SEL_DC_CLONE : SEL_DC_GOTO_DEPOT;
                NWidgetStacked *nwi = this->GetWidget<NWidgetStacked>(WID_VV_SELECT_DEPOT_CLONE); // Selection widget 'send to depot' / 'clone'.
                if (nwi->shown_plane + SEL_DC_BASEPLANE != plane) {
                        this->SelectPlane(plane);
                        this->SetWidgetDirty(WID_VV_SELECT_DEPOT_CLONE);
                }
                /* The same system applies to widget WID_VV_REFIT_VEH and VVW_WIDGET_TURN_AROUND.*/
                if (v->IsGroundVehicle()) {
                        PlaneSelections plane = veh_stopped ? SEL_RT_REFIT : SEL_RT_TURN_AROUND;
                        NWidgetStacked *nwi = this->GetWidget<NWidgetStacked>(WID_VV_SELECT_REFIT_TURN);
                        if (nwi->shown_plane + SEL_RT_BASEPLANE != plane) {
                                this->SelectPlane(plane);
                                this->SetWidgetDirty(WID_VV_SELECT_REFIT_TURN);
                        }
                }
        }

        /**
         * Some data on this window has become invalid.
         * @param data Information about the changed data.
         * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
         */
        void OnInvalidateData(int data = 0, bool gui_scope = true) override
        {
                if (data == VIWD_AUTOREPLACE) {
                        /* Autoreplace replaced the vehicle.
                         * Nothing to do for this window. */
                        return;
                }

                this->UpdateButtonStatus();
        }

        bool IsNewGRFInspectable() const override
        {
                return ::IsNewGRFInspectable(GetGrfSpecFeature(Vehicle::Get(this->window_number)->type), this->window_number);
        }

        void ShowNewGRFInspectWindow() const override
        {
                ::ShowNewGRFInspectWindow(GetGrfSpecFeature(Vehicle::Get(this->window_number)->type), this->window_number);
        }
};


/** Shows the vehicle view window of the given vehicle. */
void ShowVehicleViewWindow(const Vehicle *v)
{
        AllocateWindowDescFront<VehicleViewWindow>((v->type == VEH_TRAIN) ? &_train_view_desc : &_vehicle_view_desc, v->index);
}

/**
 * Dispatch a "vehicle selected" event if any window waits for it.
 * @param v selected vehicle;
 * @return did any window accept vehicle selection?
 */
bool VehicleClicked(const Vehicle *v)
{
        assert(v != nullptr);
        if (!(_thd.place_mode & HT_VEHICLE)) return false;

        v = v->First();
        if (!v->IsPrimaryVehicle()) return false;

        return _thd.GetCallbackWnd()->OnVehicleSelect(v);
}

void StopGlobalFollowVehicle(const Vehicle *v)
{
        Window *w = FindWindowById(WC_MAIN_WINDOW, 0);
        if (w != nullptr && w->viewport->follow_vehicle == v->index) {
                ScrollMainWindowTo(v->x_pos, v->y_pos, v->z_pos, true); // lock the main view on the vehicle's last position
                w->viewport->follow_vehicle = INVALID_VEHICLE;
        }
}


/**
 * This is the Callback method after the construction attempt of a primary vehicle
 * @param cmd unused
 * @param result indicates completion (or not) of the operation
 * @param new_veh_id ID of the new vehicle.
 */
void CcBuildPrimaryVehicle(Commands cmd, const CommandCost &result, VehicleID new_veh_id, uint, uint16)
{
        if (result.Failed()) return;

        const Vehicle *v = Vehicle::Get(new_veh_id);
        ShowVehicleViewWindow(v);
}

/**
 * Get the width of a vehicle (part) in pixels.
 * @param v Vehicle to get the width for.
 * @return Width of the vehicle.
 */
int GetSingleVehicleWidth(const Vehicle *v, EngineImageType image_type)
{
        switch (v->type) {
                case VEH_TRAIN:
                        return Train::From(v)->GetDisplayImageWidth();

                case VEH_ROAD:
                        return RoadVehicle::From(v)->GetDisplayImageWidth();

                default:
                        bool rtl = _current_text_dir == TD_RTL;
                        VehicleSpriteSeq seq;
                        v->GetImage(rtl ? DIR_E : DIR_W, image_type, &seq);
                        Rect rec;
                        seq.GetBounds(&rec);
                        return UnScaleGUI(rec.right - rec.left + 1);
        }
}

/**
 * Get the width of a vehicle (including all parts of the consist) in pixels.
 * @param v Vehicle to get the width for.
 * @return Width of the vehicle.
 */
int GetVehicleWidth(const Vehicle *v, EngineImageType image_type)
{
        if (v->type == VEH_TRAIN || v->type == VEH_ROAD) {
                int vehicle_width = 0;
                for (const Vehicle *u = v; u != nullptr; u = u->Next()) {
                        vehicle_width += GetSingleVehicleWidth(u, image_type);
                }
                return vehicle_width;
        } else {
                return GetSingleVehicleWidth(v, image_type);
        }
}

/**
 * Set the mouse cursor to look like a vehicle.
 * @param v Vehicle
 * @param image_type Type of vehicle image to use.
 */
void SetMouseCursorVehicle(const Vehicle *v, EngineImageType image_type)
{
        bool rtl = _current_text_dir == TD_RTL;

        _cursor.sprite_count = 0;
        int total_width = 0;
        int y_offset = 0;
        bool rotor_seq = false; // Whether to draw the rotor of the vehicle in this step.
        bool is_ground_vehicle = v->IsGroundVehicle();

        while (v != nullptr) {
                if (total_width >= ScaleGUITrad(2 * (int)VEHICLEINFO_FULL_VEHICLE_WIDTH)) break;

                PaletteID pal = (v->vehstatus & VS_CRASHED) ? PALETTE_CRASH : GetVehiclePalette(v);
                VehicleSpriteSeq seq;

                if (rotor_seq) {
                        GetCustomRotorSprite(Aircraft::From(v), image_type, &seq);
                        if (!seq.IsValid()) seq.Set(SPR_ROTOR_STOPPED);
                        y_offset = - ScaleGUITrad(5);
                } else {
                        v->GetImage(rtl ? DIR_E : DIR_W, image_type, &seq);
                }

                if (_cursor.sprite_count + seq.count > lengthof(_cursor.sprite_seq)) break;

                for (uint i = 0; i < seq.count; ++i) {
                        PaletteID pal2 = (v->vehstatus & VS_CRASHED) || !seq.seq[i].pal ? pal : seq.seq[i].pal;
                        _cursor.sprite_seq[_cursor.sprite_count].sprite = seq.seq[i].sprite;
                        _cursor.sprite_seq[_cursor.sprite_count].pal = pal2;
                        _cursor.sprite_pos[_cursor.sprite_count].x = rtl ? -total_width : total_width;
                        _cursor.sprite_pos[_cursor.sprite_count].y = y_offset;
                        _cursor.sprite_count++;
                }

                if (v->type == VEH_AIRCRAFT && v->subtype == AIR_HELICOPTER && !rotor_seq) {
                        /* Draw rotor part in the next step. */
                        rotor_seq = true;
                } else {
                        total_width += GetSingleVehicleWidth(v, image_type);
                        v = v->HasArticulatedPart() ? v->GetNextArticulatedPart() : nullptr;
                }
        }

        if (is_ground_vehicle) {
                /* Center trains and road vehicles on the front vehicle */
                int offs = (ScaleGUITrad(VEHICLEINFO_FULL_VEHICLE_WIDTH) - total_width) / 2;
                if (rtl) offs = -offs;
                for (uint i = 0; i < _cursor.sprite_count; ++i) {
                        _cursor.sprite_pos[i].x += offs;
                }
        }

        UpdateCursorSize();
}