Doc: Clarify comment that SND_05_TRAIN_THROUGH_TUNNEL is only for steam engines ...

[openttd-github.git] / src / company_cmd.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 company_cmd.cpp Handling of companies. */

#include "stdafx.h"
#include "company_base.h"
#include "company_func.h"
#include "company_gui.h"
#include "core/backup_type.hpp"
#include "town.h"
#include "news_func.h"
#include "cmd_helper.h"
#include "command_func.h"
#include "network/network.h"
#include "network/network_func.h"
#include "network/network_base.h"
#include "network/network_admin.h"
#include "ai/ai.hpp"
#include "company_manager_face.h"
#include "window_func.h"
#include "strings_func.h"
#include "date_func.h"
#include "sound_func.h"
#include "rail.h"
#include "core/pool_func.hpp"
#include "settings_func.h"
#include "vehicle_base.h"
#include "vehicle_func.h"
#include "smallmap_gui.h"
#include "game/game.hpp"
#include "goal_base.h"
#include "story_base.h"
#include "widgets/statusbar_widget.h"

#include "table/strings.h"

#include "safeguards.h"

void ClearEnginesHiddenFlagOfCompany(CompanyID cid);

CompanyID _local_company;   ///< Company controlled by the human player at this client. Can also be #COMPANY_SPECTATOR.
CompanyID _current_company; ///< Company currently doing an action.
Colours _company_colours[MAX_COMPANIES];  ///< NOSAVE: can be determined from company structs.
CompanyManagerFace _company_manager_face; ///< for company manager face storage in openttd.cfg
uint _next_competitor_start;              ///< the number of ticks before the next AI is started
uint _cur_company_tick_index;             ///< used to generate a name for one company that doesn't have a name yet per tick

CompanyPool _company_pool("Company"); ///< Pool of companies.
INSTANTIATE_POOL_METHODS(Company)

/**
 * Constructor.
 * @param name_1 Name of the company.
 * @param is_ai  A computer program is running for this company.
 */
Company::Company(uint16 name_1, bool is_ai)
{
        this->name_1 = name_1;
        this->location_of_HQ = INVALID_TILE;
        this->is_ai = is_ai;
        this->terraform_limit = (uint32)_settings_game.construction.terraform_frame_burst << 16;
        this->clear_limit     = (uint32)_settings_game.construction.clear_frame_burst << 16;
        this->tree_limit      = (uint32)_settings_game.construction.tree_frame_burst << 16;

        for (uint j = 0; j < 4; j++) this->share_owners[j] = COMPANY_SPECTATOR;
        InvalidateWindowData(WC_PERFORMANCE_DETAIL, 0, INVALID_COMPANY);
}

/** Destructor. */
Company::~Company()
{
        if (CleaningPool()) return;

        DeleteCompanyWindows(this->index);
}

/**
 * Invalidating some stuff after removing item from the pool.
 * @param index index of deleted item
 */
void Company::PostDestructor(size_t index)
{
        InvalidateWindowData(WC_GRAPH_LEGEND, 0, (int)index);
        InvalidateWindowData(WC_PERFORMANCE_DETAIL, 0, (int)index);
        InvalidateWindowData(WC_COMPANY_LEAGUE, 0, 0);
        InvalidateWindowData(WC_LINKGRAPH_LEGEND, 0);
        /* If the currently shown error message has this company in it, then close it. */
        InvalidateWindowData(WC_ERRMSG, 0);
}

/**
 * Sets the local company and updates the settings that are set on a
 * per-company basis to reflect the core's state in the GUI.
 * @param new_company the new company
 * @pre Company::IsValidID(new_company) || new_company == COMPANY_SPECTATOR || new_company == OWNER_NONE
 */
void SetLocalCompany(CompanyID new_company)
{
        /* company could also be COMPANY_SPECTATOR or OWNER_NONE */
        assert(Company::IsValidID(new_company) || new_company == COMPANY_SPECTATOR || new_company == OWNER_NONE);

        /* If actually changing to another company, several windows need closing */
        bool switching_company = _local_company != new_company;

        /* Delete the chat window, if you were team chatting. */
        if (switching_company) InvalidateWindowData(WC_SEND_NETWORK_MSG, DESTTYPE_TEAM, _local_company);

        assert(IsLocalCompany());

        _current_company = _local_company = new_company;

        /* Delete any construction windows... */
        if (switching_company) DeleteConstructionWindows();

        /* ... and redraw the whole screen. */
        MarkWholeScreenDirty();
        InvalidateWindowClassesData(WC_SIGN_LIST, -1);
        InvalidateWindowClassesData(WC_GOALS_LIST);
}

/**
 * Get the colour for DrawString-subroutines which matches the colour of the company.
 * @param company Company to get the colour of.
 * @return Colour of \a company.
 */
TextColour GetDrawStringCompanyColour(CompanyID company)
{
        if (!Company::IsValidID(company)) return (TextColour)_colour_gradient[COLOUR_WHITE][4] | TC_IS_PALETTE_COLOUR;
        return (TextColour)_colour_gradient[_company_colours[company]][4] | TC_IS_PALETTE_COLOUR;
}

/**
 * Draw the icon of a company.
 * @param c Company that needs its icon drawn.
 * @param x Horizontal coordinate of the icon.
 * @param y Vertical coordinate of the icon.
 */
void DrawCompanyIcon(CompanyID c, int x, int y)
{
        DrawSprite(SPR_COMPANY_ICON, COMPANY_SPRITE_COLOUR(c), x, y);
}

/**
 * Checks whether a company manager's face is a valid encoding.
 * Unused bits are not enforced to be 0.
 * @param cmf the fact to check
 * @return true if and only if the face is valid
 */
static bool IsValidCompanyManagerFace(CompanyManagerFace cmf)
{
        if (!AreCompanyManagerFaceBitsValid(cmf, CMFV_GEN_ETHN, GE_WM)) return false;

        GenderEthnicity ge   = (GenderEthnicity)GetCompanyManagerFaceBits(cmf, CMFV_GEN_ETHN, GE_WM);
        bool has_moustache   = !HasBit(ge, GENDER_FEMALE) && GetCompanyManagerFaceBits(cmf, CMFV_HAS_MOUSTACHE,   ge) != 0;
        bool has_tie_earring = !HasBit(ge, GENDER_FEMALE) || GetCompanyManagerFaceBits(cmf, CMFV_HAS_TIE_EARRING, ge) != 0;
        bool has_glasses     = GetCompanyManagerFaceBits(cmf, CMFV_HAS_GLASSES, ge) != 0;

        if (!AreCompanyManagerFaceBitsValid(cmf, CMFV_EYE_COLOUR, ge)) return false;
        for (CompanyManagerFaceVariable cmfv = CMFV_CHEEKS; cmfv < CMFV_END; cmfv++) {
                switch (cmfv) {
                        case CMFV_MOUSTACHE:   if (!has_moustache)   continue; break;
                        case CMFV_LIPS:
                        case CMFV_NOSE:        if (has_moustache)    continue; break;
                        case CMFV_TIE_EARRING: if (!has_tie_earring) continue; break;
                        case CMFV_GLASSES:     if (!has_glasses)     continue; break;
                        default: break;
                }
                if (!AreCompanyManagerFaceBitsValid(cmf, cmfv, ge)) return false;
        }

        return true;
}

/**
 * Refresh all windows owned by a company.
 * @param company Company that changed, and needs its windows refreshed.
 */
void InvalidateCompanyWindows(const Company *company)
{
        CompanyID cid = company->index;

        if (cid == _local_company) SetWindowWidgetDirty(WC_STATUS_BAR, 0, WID_S_RIGHT);
        SetWindowDirty(WC_FINANCES, cid);
}

/**
 * Verify whether the company can pay the bill.
 * @param[in,out] cost Money to pay, is changed to an error if the company does not have enough money.
 * @return Function returns \c true if the company has enough money, else it returns \c false.
 */
bool CheckCompanyHasMoney(CommandCost &cost)
{
        if (cost.GetCost() > 0) {
                const Company *c = Company::GetIfValid(_current_company);
                if (c != nullptr && cost.GetCost() > c->money) {
                        SetDParam(0, cost.GetCost());
                        cost.MakeError(STR_ERROR_NOT_ENOUGH_CASH_REQUIRES_CURRENCY);
                        return false;
                }
        }
        return true;
}

/**
 * Deduct costs of a command from the money of a company.
 * @param c Company to pay the bill.
 * @param cost Money to pay.
 */
static void SubtractMoneyFromAnyCompany(Company *c, const CommandCost &cost)
{
        if (cost.GetCost() == 0) return;
        assert(cost.GetExpensesType() != INVALID_EXPENSES);

        c->money -= cost.GetCost();
        c->yearly_expenses[0][cost.GetExpensesType()] += cost.GetCost();

        if (HasBit(1 << EXPENSES_TRAIN_INC    |
                   1 << EXPENSES_ROADVEH_INC  |
                   1 << EXPENSES_AIRCRAFT_INC |
                   1 << EXPENSES_SHIP_INC, cost.GetExpensesType())) {
                c->cur_economy.income -= cost.GetCost();
        } else if (HasBit(1 << EXPENSES_TRAIN_RUN    |
                          1 << EXPENSES_ROADVEH_RUN  |
                          1 << EXPENSES_AIRCRAFT_RUN |
                          1 << EXPENSES_SHIP_RUN     |
                          1 << EXPENSES_PROPERTY     |
                          1 << EXPENSES_LOAN_INT, cost.GetExpensesType())) {
                c->cur_economy.expenses -= cost.GetCost();
        }

        InvalidateCompanyWindows(c);
}

/**
 * Subtract money from the #_current_company, if the company is valid.
 * @param cost Money to pay.
 */
void SubtractMoneyFromCompany(const CommandCost &cost)
{
        Company *c = Company::GetIfValid(_current_company);
        if (c != nullptr) SubtractMoneyFromAnyCompany(c, cost);
}

/**
 * Subtract money from a company, including the money fraction.
 * @param company Company paying the bill.
 * @param cst     Cost of a command.
 */
void SubtractMoneyFromCompanyFract(CompanyID company, const CommandCost &cst)
{
        Company *c = Company::Get(company);
        byte m = c->money_fraction;
        Money cost = cst.GetCost();

        c->money_fraction = m - (byte)cost;
        cost >>= 8;
        if (c->money_fraction > m) cost++;
        if (cost != 0) SubtractMoneyFromAnyCompany(c, CommandCost(cst.GetExpensesType(), cost));
}

/** Update the landscaping limits per company. */
void UpdateLandscapingLimits()
{
        for (Company *c : Company::Iterate()) {
                c->terraform_limit = std::min<uint64>((uint64)c->terraform_limit + _settings_game.construction.terraform_per_64k_frames, (uint64)_settings_game.construction.terraform_frame_burst << 16);
                c->clear_limit     = std::min<uint64>((uint64)c->clear_limit     + _settings_game.construction.clear_per_64k_frames,     (uint64)_settings_game.construction.clear_frame_burst << 16);
                c->tree_limit      = std::min<uint64>((uint64)c->tree_limit      + _settings_game.construction.tree_per_64k_frames,      (uint64)_settings_game.construction.tree_frame_burst << 16);
        }
}

/**
 * Set the right DParams to get the name of an owner.
 * @param owner the owner to get the name of.
 * @param tile  optional tile to get the right town.
 * @pre if tile == 0, then owner can't be OWNER_TOWN.
 */
void GetNameOfOwner(Owner owner, TileIndex tile)
{
        SetDParam(2, owner);

        if (owner != OWNER_TOWN) {
                if (!Company::IsValidID(owner)) {
                        SetDParam(0, STR_COMPANY_SOMEONE);
                } else {
                        SetDParam(0, STR_COMPANY_NAME);
                        SetDParam(1, owner);
                }
        } else {
                assert(tile != 0);
                const Town *t = ClosestTownFromTile(tile, UINT_MAX);

                SetDParam(0, STR_TOWN_NAME);
                SetDParam(1, t->index);
        }
}


/**
 * Check whether the current owner owns something.
 * If that isn't the case an appropriate error will be given.
 * @param owner the owner of the thing to check.
 * @param tile  optional tile to get the right town.
 * @pre if tile == 0 then the owner can't be OWNER_TOWN.
 * @return A succeeded command iff it's owned by the current company, else a failed command.
 */
CommandCost CheckOwnership(Owner owner, TileIndex tile)
{
        assert(owner < OWNER_END);
        assert(owner != OWNER_TOWN || tile != 0);

        if (owner == _current_company) return CommandCost();

        GetNameOfOwner(owner, tile);
        return_cmd_error(STR_ERROR_OWNED_BY);
}

/**
 * Check whether the current owner owns the stuff on
 * the given tile.  If that isn't the case an
 * appropriate error will be given.
 * @param tile the tile to check.
 * @return A succeeded command iff it's owned by the current company, else a failed command.
 */
CommandCost CheckTileOwnership(TileIndex tile)
{
        Owner owner = GetTileOwner(tile);

        assert(owner < OWNER_END);

        if (owner == _current_company) return CommandCost();

        /* no need to get the name of the owner unless we're the local company (saves some time) */
        if (IsLocalCompany()) GetNameOfOwner(owner, tile);
        return_cmd_error(STR_ERROR_OWNED_BY);
}

/**
 * Generate the name of a company from the last build coordinate.
 * @param c Company to give a name.
 */
static void GenerateCompanyName(Company *c)
{
        /* Reserve space for extra unicode character. We need to do this to be able
         * to detect too long company name. */
        char buffer[(MAX_LENGTH_COMPANY_NAME_CHARS + 1) * MAX_CHAR_LENGTH];

        if (c->name_1 != STR_SV_UNNAMED) return;
        if (c->last_build_coordinate == 0) return;

        Town *t = ClosestTownFromTile(c->last_build_coordinate, UINT_MAX);

        StringID str;
        uint32 strp;
        if (t->name.empty() && IsInsideMM(t->townnametype, SPECSTR_TOWNNAME_START, SPECSTR_TOWNNAME_LAST + 1)) {
                str = t->townnametype - SPECSTR_TOWNNAME_START + SPECSTR_COMPANY_NAME_START;
                strp = t->townnameparts;

verify_name:;
                /* No companies must have this name already */
                for (const Company *cc : Company::Iterate()) {
                        if (cc->name_1 == str && cc->name_2 == strp) goto bad_town_name;
                }

                GetString(buffer, str, lastof(buffer));
                if (Utf8StringLength(buffer) >= MAX_LENGTH_COMPANY_NAME_CHARS) goto bad_town_name;

set_name:;
                c->name_1 = str;
                c->name_2 = strp;

                MarkWholeScreenDirty();

                if (c->is_ai) {
                        CompanyNewsInformation *cni = MallocT<CompanyNewsInformation>(1);
                        cni->FillData(c);
                        SetDParam(0, STR_NEWS_COMPANY_LAUNCH_TITLE);
                        SetDParam(1, STR_NEWS_COMPANY_LAUNCH_DESCRIPTION);
                        SetDParamStr(2, cni->company_name);
                        SetDParam(3, t->index);
                        AddNewsItem(STR_MESSAGE_NEWS_FORMAT, NT_COMPANY_INFO, NF_COMPANY, NR_TILE, c->last_build_coordinate, NR_NONE, UINT32_MAX, cni);
                }
                return;
        }
bad_town_name:;

        if (c->president_name_1 == SPECSTR_PRESIDENT_NAME) {
                str = SPECSTR_ANDCO_NAME;
                strp = c->president_name_2;
                goto set_name;
        } else {
                str = SPECSTR_ANDCO_NAME;
                strp = Random();
                goto verify_name;
        }
}

/** Sorting weights for the company colours. */
static const byte _colour_sort[COLOUR_END] = {2, 2, 3, 2, 3, 2, 3, 2, 3, 2, 2, 2, 3, 1, 1, 1};
/** Similar colours, so we can try to prevent same coloured companies. */
static const Colours _similar_colour[COLOUR_END][2] = {
        { COLOUR_BLUE,       COLOUR_LIGHT_BLUE }, // COLOUR_DARK_BLUE
        { COLOUR_GREEN,      COLOUR_DARK_GREEN }, // COLOUR_PALE_GREEN
        { INVALID_COLOUR,    INVALID_COLOUR    }, // COLOUR_PINK
        { COLOUR_ORANGE,     INVALID_COLOUR    }, // COLOUR_YELLOW
        { INVALID_COLOUR,    INVALID_COLOUR    }, // COLOUR_RED
        { COLOUR_DARK_BLUE,  COLOUR_BLUE       }, // COLOUR_LIGHT_BLUE
        { COLOUR_PALE_GREEN, COLOUR_DARK_GREEN }, // COLOUR_GREEN
        { COLOUR_PALE_GREEN, COLOUR_GREEN      }, // COLOUR_DARK_GREEN
        { COLOUR_DARK_BLUE,  COLOUR_LIGHT_BLUE }, // COLOUR_BLUE
        { COLOUR_BROWN,      COLOUR_ORANGE     }, // COLOUR_CREAM
        { COLOUR_PURPLE,     INVALID_COLOUR    }, // COLOUR_MAUVE
        { COLOUR_MAUVE,      INVALID_COLOUR    }, // COLOUR_PURPLE
        { COLOUR_YELLOW,     COLOUR_CREAM      }, // COLOUR_ORANGE
        { COLOUR_CREAM,      INVALID_COLOUR    }, // COLOUR_BROWN
        { COLOUR_WHITE,      INVALID_COLOUR    }, // COLOUR_GREY
        { COLOUR_GREY,       INVALID_COLOUR    }, // COLOUR_WHITE
};

/**
 * Generate a company colour.
 * @return Generated company colour.
 */
static Colours GenerateCompanyColour()
{
        Colours colours[COLOUR_END];

        /* Initialize array */
        for (uint i = 0; i < COLOUR_END; i++) colours[i] = (Colours)i;

        /* And randomize it */
        for (uint i = 0; i < 100; i++) {
                uint r = Random();
                Swap(colours[GB(r, 0, 4)], colours[GB(r, 4, 4)]);
        }

        /* Bubble sort it according to the values in table 1 */
        for (uint i = 0; i < COLOUR_END; i++) {
                for (uint j = 1; j < COLOUR_END; j++) {
                        if (_colour_sort[colours[j - 1]] < _colour_sort[colours[j]]) {
                                Swap(colours[j - 1], colours[j]);
                        }
                }
        }

        /* Move the colours that look similar to each company's colour to the side */
        for (const Company *c : Company::Iterate()) {
                Colours pcolour = (Colours)c->colour;

                for (uint i = 0; i < COLOUR_END; i++) {
                        if (colours[i] == pcolour) {
                                colours[i] = INVALID_COLOUR;
                                break;
                        }
                }

                for (uint j = 0; j < 2; j++) {
                        Colours similar = _similar_colour[pcolour][j];
                        if (similar == INVALID_COLOUR) break;

                        for (uint i = 1; i < COLOUR_END; i++) {
                                if (colours[i - 1] == similar) Swap(colours[i - 1], colours[i]);
                        }
                }
        }

        /* Return the first available colour */
        for (uint i = 0; i < COLOUR_END; i++) {
                if (colours[i] != INVALID_COLOUR) return colours[i];
        }

        NOT_REACHED();
}

/**
 * Generate a random president name of a company.
 * @param c Company that needs a new president name.
 */
static void GeneratePresidentName(Company *c)
{
        for (;;) {
restart:;
                c->president_name_2 = Random();
                c->president_name_1 = SPECSTR_PRESIDENT_NAME;

                /* Reserve space for extra unicode character. We need to do this to be able
                 * to detect too long president name. */
                char buffer[(MAX_LENGTH_PRESIDENT_NAME_CHARS + 1) * MAX_CHAR_LENGTH];
                SetDParam(0, c->index);
                GetString(buffer, STR_PRESIDENT_NAME, lastof(buffer));
                if (Utf8StringLength(buffer) >= MAX_LENGTH_PRESIDENT_NAME_CHARS) continue;

                for (const Company *cc : Company::Iterate()) {
                        if (c != cc) {
                                /* Reserve extra space so even overlength president names can be compared. */
                                char buffer2[(MAX_LENGTH_PRESIDENT_NAME_CHARS + 1) * MAX_CHAR_LENGTH];
                                SetDParam(0, cc->index);
                                GetString(buffer2, STR_PRESIDENT_NAME, lastof(buffer2));
                                if (strcmp(buffer2, buffer) == 0) goto restart;
                        }
                }
                return;
        }
}

/**
 * Reset the livery schemes to the company's primary colour.
 * This is used on loading games without livery information and on new company start up.
 * @param c Company to reset.
 */
void ResetCompanyLivery(Company *c)
{
        for (LiveryScheme scheme = LS_BEGIN; scheme < LS_END; scheme++) {
                c->livery[scheme].in_use  = 0;
                c->livery[scheme].colour1 = c->colour;
                c->livery[scheme].colour2 = c->colour;
        }

        for (Group *g : Group::Iterate()) {
                if (g->owner == c->index) {
                        g->livery.in_use  = 0;
                        g->livery.colour1 = c->colour;
                        g->livery.colour2 = c->colour;
                }
        }
}

/**
 * Create a new company and sets all company variables default values
 *
 * @param is_ai is an AI company?
 * @param company CompanyID to use for the new company
 * @return the company struct
 */
Company *DoStartupNewCompany(bool is_ai, CompanyID company = INVALID_COMPANY)
{
        if (!Company::CanAllocateItem()) return nullptr;

        /* we have to generate colour before this company is valid */
        Colours colour = GenerateCompanyColour();

        Company *c;
        if (company == INVALID_COMPANY) {
                c = new Company(STR_SV_UNNAMED, is_ai);
        } else {
                if (Company::IsValidID(company)) return nullptr;
                c = new (company) Company(STR_SV_UNNAMED, is_ai);
        }

        c->colour = colour;

        ResetCompanyLivery(c);
        _company_colours[c->index] = (Colours)c->colour;

        c->money = c->current_loan = (std::min<int64>(INITIAL_LOAN, _economy.max_loan) * _economy.inflation_prices >> 16) / 50000 * 50000;

        c->share_owners[0] = c->share_owners[1] = c->share_owners[2] = c->share_owners[3] = INVALID_OWNER;

        c->avail_railtypes = GetCompanyRailtypes(c->index);
        c->avail_roadtypes = GetCompanyRoadTypes(c->index);
        c->inaugurated_year = _cur_year;
        RandomCompanyManagerFaceBits(c->face, (GenderEthnicity)Random(), false, false); // create a random company manager face

        SetDefaultCompanySettings(c->index);
        ClearEnginesHiddenFlagOfCompany(c->index);

        GeneratePresidentName(c);

        SetWindowDirty(WC_GRAPH_LEGEND, 0);
        SetWindowClassesDirty(WC_CLIENT_LIST_POPUP);
        SetWindowDirty(WC_CLIENT_LIST, 0);
        InvalidateWindowData(WC_LINKGRAPH_LEGEND, 0);
        BuildOwnerLegend();
        InvalidateWindowData(WC_SMALLMAP, 0, 1);

        if (is_ai && (!_networking || _network_server)) AI::StartNew(c->index);

        AI::BroadcastNewEvent(new ScriptEventCompanyNew(c->index), c->index);
        Game::NewEvent(new ScriptEventCompanyNew(c->index));

        return c;
}

/** Start the next competitor now. */
void StartupCompanies()
{
        _next_competitor_start = 0;
}

/** Start a new competitor company if possible. */
static bool MaybeStartNewCompany()
{
        if (_networking && Company::GetNumItems() >= _settings_client.network.max_companies) return false;

        /* count number of competitors */
        uint n = 0;
        for (const Company *c : Company::Iterate()) {
                if (c->is_ai) n++;
        }

        if (n < (uint)_settings_game.difficulty.max_no_competitors) {
                /* Send a command to all clients to start up a new AI.
                 * Works fine for Multiplayer and Singleplayer */
                return DoCommandP(0, CCA_NEW_AI | INVALID_COMPANY << 16, 0, CMD_COMPANY_CTRL);
        }

        return false;
}

/** Initialize the pool of companies. */
void InitializeCompanies()
{
        _cur_company_tick_index = 0;
}

/**
 * May company \a cbig buy company \a csmall?
 * @param cbig   Company buying \a csmall.
 * @param csmall Company getting bought.
 * @return Return \c true if it is allowed.
 */
bool MayCompanyTakeOver(CompanyID cbig, CompanyID csmall)
{
        const Company *c1 = Company::Get(cbig);
        const Company *c2 = Company::Get(csmall);

        /* Do the combined vehicle counts stay within the limits? */
        return c1->group_all[VEH_TRAIN].num_vehicle + c2->group_all[VEH_TRAIN].num_vehicle <= _settings_game.vehicle.max_trains &&
                c1->group_all[VEH_ROAD].num_vehicle     + c2->group_all[VEH_ROAD].num_vehicle     <= _settings_game.vehicle.max_roadveh &&
                c1->group_all[VEH_SHIP].num_vehicle     + c2->group_all[VEH_SHIP].num_vehicle     <= _settings_game.vehicle.max_ships &&
                c1->group_all[VEH_AIRCRAFT].num_vehicle + c2->group_all[VEH_AIRCRAFT].num_vehicle <= _settings_game.vehicle.max_aircraft;
}

/**
 * Handle the bankruptcy take over of a company.
 * Companies going bankrupt will ask the other companies in order of their
 * performance rating, so better performing companies get the 'do you want to
 * merge with Y' question earlier. The question will then stay till either the
 * company has gone bankrupt or got merged with a company.
 *
 * @param c the company that is going bankrupt.
 */
static void HandleBankruptcyTakeover(Company *c)
{
        /* Amount of time out for each company to take over a company;
         * Timeout is a quarter (3 months of 30 days) divided over the
         * number of companies. The minimum number of days in a quarter
         * is 90: 31 in January, 28 in February and 31 in March.
         * Note that the company going bankrupt can't buy itself. */
        static const int TAKE_OVER_TIMEOUT = 3 * 30 * DAY_TICKS / (MAX_COMPANIES - 1);

        assert(c->bankrupt_asked != 0);

        /* We're currently asking some company to buy 'us' */
        if (c->bankrupt_timeout != 0) {
                c->bankrupt_timeout -= MAX_COMPANIES;
                if (c->bankrupt_timeout > 0) return;
                c->bankrupt_timeout = 0;

                return;
        }

        /* Did we ask everyone for bankruptcy? If so, bail out. */
        if (c->bankrupt_asked == MAX_UVALUE(CompanyMask)) return;

        Company *best = nullptr;
        int32 best_performance = -1;

        /* Ask the company with the highest performance history first */
        for (Company *c2 : Company::Iterate()) {
                if (c2->bankrupt_asked == 0 && // Don't ask companies going bankrupt themselves
                                !HasBit(c->bankrupt_asked, c2->index) &&
                                best_performance < c2->old_economy[1].performance_history &&
                                MayCompanyTakeOver(c2->index, c->index)) {
                        best_performance = c2->old_economy[1].performance_history;
                        best = c2;
                }
        }

        /* Asked all companies? */
        if (best_performance == -1) {
                c->bankrupt_asked = MAX_UVALUE(CompanyMask);
                return;
        }

        SetBit(c->bankrupt_asked, best->index);

        c->bankrupt_timeout = TAKE_OVER_TIMEOUT;
        if (best->is_ai) {
                AI::NewEvent(best->index, new ScriptEventCompanyAskMerger(c->index, ClampToI32(c->bankrupt_value)));
        } else if (IsInteractiveCompany(best->index)) {
                ShowBuyCompanyDialog(c->index);
        }
}

/** Called every tick for updating some company info. */
void OnTick_Companies()
{
        if (_game_mode == GM_EDITOR) return;

        Company *c = Company::GetIfValid(_cur_company_tick_index);
        if (c != nullptr) {
                if (c->name_1 != 0) GenerateCompanyName(c);
                if (c->bankrupt_asked != 0) HandleBankruptcyTakeover(c);
        }

        if (_next_competitor_start == 0) {
                /* AI::GetStartNextTime() can return 0. */
                _next_competitor_start = std::max(1, AI::GetStartNextTime() * DAY_TICKS);
        }

        if (_game_mode != GM_MENU && AI::CanStartNew() && --_next_competitor_start == 0) {
                /* Allow multiple AIs to possibly start in the same tick. */
                do {
                        if (!MaybeStartNewCompany()) break;

                        /* In networking mode, we can only send a command to start but it
                         * didn't execute yet, so we cannot loop. */
                        if (_networking) break;
                } while (AI::GetStartNextTime() == 0);
        }

        _cur_company_tick_index = (_cur_company_tick_index + 1) % MAX_COMPANIES;
}

/**
 * A year has passed, update the economic data of all companies, and perhaps show the
 * financial overview window of the local company.
 */
void CompaniesYearlyLoop()
{
        /* Copy statistics */
        for (Company *c : Company::Iterate()) {
                memmove(&c->yearly_expenses[1], &c->yearly_expenses[0], sizeof(c->yearly_expenses) - sizeof(c->yearly_expenses[0]));
                memset(&c->yearly_expenses[0], 0, sizeof(c->yearly_expenses[0]));
                SetWindowDirty(WC_FINANCES, c->index);
        }

        if (_settings_client.gui.show_finances && _local_company != COMPANY_SPECTATOR) {
                ShowCompanyFinances(_local_company);
                Company *c = Company::Get(_local_company);
                if (c->num_valid_stat_ent > 5 && c->old_economy[0].performance_history < c->old_economy[4].performance_history) {
                        if (_settings_client.sound.new_year) SndPlayFx(SND_01_BAD_YEAR);
                } else {
                        if (_settings_client.sound.new_year) SndPlayFx(SND_00_GOOD_YEAR);
                }
        }
}

/**
 * Fill the CompanyNewsInformation struct with the required data.
 * @param c the current company.
 * @param other the other company (use \c nullptr if not relevant).
 */
void CompanyNewsInformation::FillData(const Company *c, const Company *other)
{
        SetDParam(0, c->index);
        GetString(this->company_name, STR_COMPANY_NAME, lastof(this->company_name));

        if (other == nullptr) {
                *this->other_company_name = '\0';
        } else {
                SetDParam(0, other->index);
                GetString(this->other_company_name, STR_COMPANY_NAME, lastof(this->other_company_name));
                c = other;
        }

        SetDParam(0, c->index);
        GetString(this->president_name, STR_PRESIDENT_NAME_MANAGER, lastof(this->president_name));

        this->colour = c->colour;
        this->face = c->face;

}

/**
 * Called whenever company related information changes in order to notify admins.
 * @param company The company data changed of.
 */
void CompanyAdminUpdate(const Company *company)
{
        if (_network_server) NetworkAdminCompanyUpdate(company);
}

/**
 * Called whenever a company is removed in order to notify admins.
 * @param company_id The company that was removed.
 * @param reason     The reason the company was removed.
 */
void CompanyAdminRemove(CompanyID company_id, CompanyRemoveReason reason)
{
        if (_network_server) NetworkAdminCompanyRemove(company_id, (AdminCompanyRemoveReason)reason);
}

/**
 * Control the companies: add, delete, etc.
 * @param tile unused
 * @param flags operation to perform
 * @param p1 various functionality
 * - bits 0..15: CompanyCtrlAction
 * - bits 16..23: CompanyID
 * - bits 24..31: CompanyRemoveReason (with CCA_DELETE)
 * @param p2 ClientID
 * @param text unused
 * @return the cost of this operation or an error
 */
CommandCost CmdCompanyCtrl(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
{
        InvalidateWindowData(WC_COMPANY_LEAGUE, 0, 0);
        CompanyID company_id = (CompanyID)GB(p1, 16, 8);

        switch ((CompanyCtrlAction)GB(p1, 0, 16)) {
                case CCA_NEW: { // Create a new company
                        /* This command is only executed in a multiplayer game */
                        if (!_networking) return CMD_ERROR;

                        /* Has the network client a correct ClientIndex? */
                        if (!(flags & DC_EXEC)) return CommandCost();

                        ClientID client_id = (ClientID)p2;
                        NetworkClientInfo *ci = NetworkClientInfo::GetByClientID(client_id);

                        /* Delete multiplayer progress bar */
                        DeleteWindowById(WC_NETWORK_STATUS_WINDOW, WN_NETWORK_STATUS_WINDOW_JOIN);

                        Company *c = DoStartupNewCompany(false);

                        /* A new company could not be created, revert to being a spectator */
                        if (c == nullptr) {
                                /* We check for "ci != nullptr" as a client could have left by
                                 * the time we execute this command. */
                                if (_network_server && ci != nullptr) {
                                        ci->client_playas = COMPANY_SPECTATOR;
                                        NetworkUpdateClientInfo(ci->client_id);
                                }
                                break;
                        }

                        /* This is the client (or non-dedicated server) who wants a new company */
                        if (client_id == _network_own_client_id) {
                                assert(_local_company == COMPANY_SPECTATOR);
                                SetLocalCompany(c->index);
                                if (!StrEmpty(_settings_client.network.default_company_pass)) {
                                        NetworkChangeCompanyPassword(_local_company, _settings_client.network.default_company_pass);
                                }

                                /* Now that we have a new company, broadcast our company settings to
                                 * all clients so everything is in sync */
                                SyncCompanySettings();

                                MarkWholeScreenDirty();
                        }

                        NetworkServerNewCompany(c, ci);
                        break;
                }

                case CCA_NEW_AI: { // Make a new AI company
                        if (company_id != INVALID_COMPANY && company_id >= MAX_COMPANIES) return CMD_ERROR;

                        /* For network games, company deletion is delayed. */
                        if (!_networking && company_id != INVALID_COMPANY && Company::IsValidID(company_id)) return CMD_ERROR;

                        if (!(flags & DC_EXEC)) return CommandCost();

                        /* For network game, just assume deletion happened. */
                        assert(company_id == INVALID_COMPANY || !Company::IsValidID(company_id));

                        Company *c = DoStartupNewCompany(true, company_id);
                        if (c != nullptr) NetworkServerNewCompany(c, nullptr);
                        break;
                }

                case CCA_DELETE: { // Delete a company
                        CompanyRemoveReason reason = (CompanyRemoveReason)GB(p1, 24, 8);
                        if (reason >= CRR_END) return CMD_ERROR;

                        /* We can't delete the last existing company in singleplayer mode. */
                        if (!_networking && Company::GetNumItems() == 1) return CMD_ERROR;

                        Company *c = Company::GetIfValid(company_id);
                        if (c == nullptr) return CMD_ERROR;

                        if (!(flags & DC_EXEC)) return CommandCost();

                        /* Delete any open window of the company */
                        DeleteCompanyWindows(c->index);
                        CompanyNewsInformation *cni = MallocT<CompanyNewsInformation>(1);
                        cni->FillData(c);

                        /* Show the bankrupt news */
                        SetDParam(0, STR_NEWS_COMPANY_BANKRUPT_TITLE);
                        SetDParam(1, STR_NEWS_COMPANY_BANKRUPT_DESCRIPTION);
                        SetDParamStr(2, cni->company_name);
                        AddCompanyNewsItem(STR_MESSAGE_NEWS_FORMAT, cni);

                        /* Remove the company */
                        ChangeOwnershipOfCompanyItems(c->index, INVALID_OWNER);
                        if (c->is_ai) AI::Stop(c->index);

                        CompanyID c_index = c->index;
                        delete c;
                        AI::BroadcastNewEvent(new ScriptEventCompanyBankrupt(c_index));
                        Game::NewEvent(new ScriptEventCompanyBankrupt(c_index));
                        CompanyAdminRemove(c_index, (CompanyRemoveReason)reason);

                        if (StoryPage::GetNumItems() == 0 || Goal::GetNumItems() == 0) InvalidateWindowData(WC_MAIN_TOOLBAR, 0);
                        break;
                }

                default: return CMD_ERROR;
        }

        InvalidateWindowClassesData(WC_GAME_OPTIONS);
        InvalidateWindowClassesData(WC_AI_SETTINGS);
        InvalidateWindowClassesData(WC_AI_LIST);

        return CommandCost();
}

/**
 * Change the company manager's face.
 * @param tile unused
 * @param flags operation to perform
 * @param p1 unused
 * @param p2 face bitmasked
 * @param text unused
 * @return the cost of this operation or an error
 */
CommandCost CmdSetCompanyManagerFace(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
{
        CompanyManagerFace cmf = (CompanyManagerFace)p2;

        if (!IsValidCompanyManagerFace(cmf)) return CMD_ERROR;

        if (flags & DC_EXEC) {
                Company::Get(_current_company)->face = cmf;
                MarkWholeScreenDirty();
        }
        return CommandCost();
}

/**
 * Change the company's company-colour
 * @param tile unused
 * @param flags operation to perform
 * @param p1 bitstuffed:
 * p1 bits 0-7 scheme to set
 * p1 bit 8 set first/second colour
 * @param p2 new colour for vehicles, property, etc.
 * @param text unused
 * @return the cost of this operation or an error
 */
CommandCost CmdSetCompanyColour(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
{
        Colours colour = Extract<Colours, 0, 8>(p2);
        LiveryScheme scheme = Extract<LiveryScheme, 0, 8>(p1);
        bool second = HasBit(p1, 8);

        if (scheme >= LS_END || (colour >= COLOUR_END && colour != INVALID_COLOUR)) return CMD_ERROR;

        /* Default scheme can't be reset to invalid. */
        if (scheme == LS_DEFAULT && colour == INVALID_COLOUR) return CMD_ERROR;

        Company *c = Company::Get(_current_company);

        /* Ensure no two companies have the same primary colour */
        if (scheme == LS_DEFAULT && !second) {
                for (const Company *cc : Company::Iterate()) {
                        if (cc != c && cc->colour == colour) return CMD_ERROR;
                }
        }

        if (flags & DC_EXEC) {
                if (!second) {
                        if (scheme != LS_DEFAULT) SB(c->livery[scheme].in_use, 0, 1, colour != INVALID_COLOUR);
                        if (colour == INVALID_COLOUR) colour = (Colours)c->livery[LS_DEFAULT].colour1;
                        c->livery[scheme].colour1 = colour;

                        /* If setting the first colour of the default scheme, adjust the
                         * original and cached company colours too. */
                        if (scheme == LS_DEFAULT) {
                                for (int i = 1; i < LS_END; i++) {
                                        if (!HasBit(c->livery[i].in_use, 0)) c->livery[i].colour1 = colour;
                                }
                                _company_colours[_current_company] = colour;
                                c->colour = colour;
                                CompanyAdminUpdate(c);
                        }
                } else {
                        if (scheme != LS_DEFAULT) SB(c->livery[scheme].in_use, 1, 1, colour != INVALID_COLOUR);
                        if (colour == INVALID_COLOUR) colour = (Colours)c->livery[LS_DEFAULT].colour2;
                        c->livery[scheme].colour2 = colour;

                        if (scheme == LS_DEFAULT) {
                                for (int i = 1; i < LS_END; i++) {
                                        if (!HasBit(c->livery[i].in_use, 1)) c->livery[i].colour2 = colour;
                                }
                        }
                }

                if (c->livery[scheme].in_use != 0) {
                        /* If enabling a scheme, set the default scheme to be in use too */
                        c->livery[LS_DEFAULT].in_use = 1;
                } else {
                        /* Else loop through all schemes to see if any are left enabled.
                         * If not, disable the default scheme too. */
                        c->livery[LS_DEFAULT].in_use = 0;
                        for (scheme = LS_DEFAULT; scheme < LS_END; scheme++) {
                                if (c->livery[scheme].in_use != 0) {
                                        c->livery[LS_DEFAULT].in_use = 1;
                                        break;
                                }
                        }
                }

                ResetVehicleColourMap();
                MarkWholeScreenDirty();

                /* All graph related to companies use the company colour. */
                InvalidateWindowData(WC_INCOME_GRAPH, 0);
                InvalidateWindowData(WC_OPERATING_PROFIT, 0);
                InvalidateWindowData(WC_DELIVERED_CARGO, 0);
                InvalidateWindowData(WC_PERFORMANCE_HISTORY, 0);
                InvalidateWindowData(WC_COMPANY_VALUE, 0);
                InvalidateWindowData(WC_LINKGRAPH_LEGEND, 0);
                /* The smallmap owner view also stores the company colours. */
                BuildOwnerLegend();
                InvalidateWindowData(WC_SMALLMAP, 0, 1);

                /* Company colour data is indirectly cached. */
                for (Vehicle *v : Vehicle::Iterate()) {
                        if (v->owner == _current_company) v->InvalidateNewGRFCache();
                }

                extern void UpdateObjectColours(const Company *c);
                UpdateObjectColours(c);
        }
        return CommandCost();
}

/**
 * Is the given name in use as name of a company?
 * @param name Name to search.
 * @return \c true if the name us unique (that is, not in use), else \c false.
 */
static bool IsUniqueCompanyName(const char *name)
{
        for (const Company *c : Company::Iterate()) {
                if (!c->name.empty() && c->name == name) return false;
        }

        return true;
}

/**
 * Change the name of the company.
 * @param tile unused
 * @param flags operation to perform
 * @param p1 unused
 * @param p2 unused
 * @param text the new name or an empty string when resetting to the default
 * @return the cost of this operation or an error
 */
CommandCost CmdRenameCompany(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
{
        bool reset = StrEmpty(text);

        if (!reset) {
                if (Utf8StringLength(text) >= MAX_LENGTH_COMPANY_NAME_CHARS) return CMD_ERROR;
                if (!IsUniqueCompanyName(text)) return_cmd_error(STR_ERROR_NAME_MUST_BE_UNIQUE);
        }

        if (flags & DC_EXEC) {
                Company *c = Company::Get(_current_company);
                if (reset) {
                        c->name.clear();
                } else {
                        c->name = text;
                }
                MarkWholeScreenDirty();
                CompanyAdminUpdate(c);
        }

        return CommandCost();
}

/**
 * Is the given name in use as president name of a company?
 * @param name Name to search.
 * @return \c true if the name us unique (that is, not in use), else \c false.
 */
static bool IsUniquePresidentName(const char *name)
{
        for (const Company *c : Company::Iterate()) {
                if (!c->president_name.empty() && c->president_name == name) return false;
        }

        return true;
}

/**
 * Change the name of the president.
 * @param tile unused
 * @param flags operation to perform
 * @param p1 unused
 * @param p2 unused
 * @param text the new name or an empty string when resetting to the default
 * @return the cost of this operation or an error
 */
CommandCost CmdRenamePresident(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
{
        bool reset = StrEmpty(text);

        if (!reset) {
                if (Utf8StringLength(text) >= MAX_LENGTH_PRESIDENT_NAME_CHARS) return CMD_ERROR;
                if (!IsUniquePresidentName(text)) return_cmd_error(STR_ERROR_NAME_MUST_BE_UNIQUE);
        }

        if (flags & DC_EXEC) {
                Company *c = Company::Get(_current_company);

                if (reset) {
                        c->president_name.clear();
                } else {
                        c->president_name = text;

                        if (c->name_1 == STR_SV_UNNAMED && c->name.empty()) {
                                char buf[80];

                                seprintf(buf, lastof(buf), "%s Transport", text);
                                DoCommand(0, 0, 0, DC_EXEC, CMD_RENAME_COMPANY, buf);
                        }
                }

                MarkWholeScreenDirty();
                CompanyAdminUpdate(c);
        }

        return CommandCost();
}

/**
 * Get the service interval for the given company and vehicle type.
 * @param c The company, or nullptr for client-default settings.
 * @param type The vehicle type to get the interval for.
 * @return The service interval.
 */
int CompanyServiceInterval(const Company *c, VehicleType type)
{
        const VehicleDefaultSettings *vds = (c == nullptr) ? &_settings_client.company.vehicle : &c->settings.vehicle;
        switch (type) {
                default: NOT_REACHED();
                case VEH_TRAIN:    return vds->servint_trains;
                case VEH_ROAD:     return vds->servint_roadveh;
                case VEH_AIRCRAFT: return vds->servint_aircraft;
                case VEH_SHIP:     return vds->servint_ships;
        }
}

/**
 * Get total sum of all owned road bits.
 * @return Combined total road road bits.
 */
uint32 CompanyInfrastructure::GetRoadTotal() const
{
        uint32 total = 0;
        for (RoadType rt = ROADTYPE_BEGIN; rt != ROADTYPE_END; rt++) {
                if (RoadTypeIsRoad(rt)) total += this->road[rt];
        }
        return total;
}

/**
 * Get total sum of all owned tram bits.
 * @return Combined total of tram road bits.
 */
uint32 CompanyInfrastructure::GetTramTotal() const
{
        uint32 total = 0;
        for (RoadType rt = ROADTYPE_BEGIN; rt != ROADTYPE_END; rt++) {
                if (RoadTypeIsTram(rt)) total += this->road[rt];
        }
        return total;
}

/**
 * Transfer funds (money) from one company to another.
 * To prevent abuse in multiplayer games you can only send money to other
 * companies if you have paid off your loan (either explicitly, or implicitly
 * given the fact that you have more money than loan).
 * @param tile unused
 * @param flags operation to perform
 * @param p1 the amount of money to transfer; max 20.000.000
 * @param p2 the company to transfer the money to
 * @param text unused
 * @return the cost of this operation or an error
 */
CommandCost CmdGiveMoney(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
{
        if (!_settings_game.economy.give_money) return CMD_ERROR;

        const Company *c = Company::Get(_current_company);
        CommandCost amount(EXPENSES_OTHER, std::min<Money>(p1, 20000000LL));
        CompanyID dest_company = (CompanyID)p2;

        /* You can only transfer funds that is in excess of your loan */
        if (c->money - c->current_loan < amount.GetCost() || amount.GetCost() < 0) return_cmd_error(STR_ERROR_INSUFFICIENT_FUNDS);
        if (!Company::IsValidID(dest_company)) return CMD_ERROR;

        if (flags & DC_EXEC) {
                /* Add money to company */
                Backup<CompanyID> cur_company(_current_company, dest_company, FILE_LINE);
                SubtractMoneyFromCompany(CommandCost(EXPENSES_OTHER, -amount.GetCost()));
                cur_company.Restore();

                if (_networking) {
                        char dest_company_name[MAX_LENGTH_COMPANY_NAME_CHARS * MAX_CHAR_LENGTH];
                        SetDParam(0, dest_company);
                        GetString(dest_company_name, STR_COMPANY_NAME, lastof(dest_company_name));

                        char from_company_name[MAX_LENGTH_COMPANY_NAME_CHARS * MAX_CHAR_LENGTH];
                        SetDParam(0, _current_company);
                        GetString(from_company_name, STR_COMPANY_NAME, lastof(from_company_name));

                        NetworkTextMessage(NETWORK_ACTION_GIVE_MONEY, GetDrawStringCompanyColour(_current_company), false, from_company_name, dest_company_name, amount.GetCost());
                }
        }

        /* Subtract money from local-company */
        return amount;
}