Fix variable warnings

[minetest_easyvend.git] / easyvend.lua

---
--vendor
--Copyright (C) 2012 Bad_Command
--Rewrited by Andrej
--
--This library is free software; you can redistribute it and/or
--modify it under the terms of the GNU Lesser General Public
--License as published by the Free Software Foundation; either
--version 2.1 of the License, or (at your option) any later version.
--
--This program 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 Lesser General Public
--License along with this library; if not, write to the Free Software
--Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
---

-- TODO: Improve mod compability
local slots_max = 31

local registered_chests = {}
local cost_stack_max = minetest.registered_items[easyvend.currency].stack_max
local maxcost = cost_stack_max * slots_max

local joketimer_start = 3

-- Allow for other mods to register custom chests
easyvend.register_chest = function(node_name, inv_list, meta_owner)
        registered_chests[node_name] = { inv_list = inv_list, meta_owner = meta_owner }
end

-- Partly a wrapper around contains_item, but does special treatment if the item
-- is a tool. Basically checks whether the items exist in the supplied inventory
-- list. If check_wear is true, only counts items without wear.
easyvend.check_and_get_items = function(inventory, listname, itemtable, check_wear)
        local itemstring = itemtable.name
        local minimum = itemtable.count
        if check_wear == nil then check_wear = false end
        local get_items = {}
        -- Tool workaround
        if minetest.registered_tools[itemstring] ~= nil then
                local count = 0
                for i=1,inventory:get_size(listname) do
                        local stack = inventory:get_stack(listname, i)
                        if stack:get_name() == itemstring then
                                if not check_wear or stack:get_wear() == 0 then
                                        count = count + 1
                                        table.insert(get_items, {id=i, item=stack})
                                        if count >= minimum then
                                                return true, get_items
                                        end
                                end
                        end
                end
                return false
        else
                -- Normal Minetest check
                return inventory:contains_item(listname, ItemStack(itemtable))
        end
end


if minetest.get_modpath("default") ~= nil then
        easyvend.register_chest("default:chest_locked", "main", "owner")
end

easyvend.free_slots= function(inv, listname)
        local size = inv:get_size(listname)
        local free = 0
        for i=1,size do
                local stack = inv:get_stack(listname, i)
                if stack:is_empty() then
                        free = free + 1
                end
        end
        return free
end

easyvend.buysell = function(nodename)
        local buysell = nil
        if ( nodename == "easyvend:depositor" or nodename == "easyvend:depositor_on" ) then
                buysell = "buy"
        elseif ( nodename == "easyvend:vendor" or nodename == "easyvend:vendor_on" ) then
                buysell = "sell"
        end
        return buysell
end

easyvend.is_active = function(nodename)
        if ( nodename == "easyvend:depositor_on" or nodename == "easyvend:vendor_on" ) then
                return true
        elseif ( nodename == "easyvend:depositor" or nodename == "easyvend:vendor" ) then
                return false
        else
                return nil
        end
end

easyvend.set_formspec = function(pos, player)
        local meta = minetest.get_meta(pos)
        local node = minetest.get_node(pos)

        local description = minetest.registered_nodes[node.name].description;
        local number = meta:get_int("number")
        local cost = meta:get_int("cost")
        local itemname = meta:get_string("itemname")
        local bg = ""
        local configmode = meta:get_int("configmode") == 1
        if minetest.get_modpath("default") then
            bg = default.gui_bg .. default.gui_bg_img .. default.gui_slots
        end

        local numbertext, costtext, buysellbuttontext
        local itemcounttooltip = "Item count (append “s” to multiply with maximum stack size)"
        local buysell = easyvend.buysell(node.name)
        if buysell == "sell" then
                numbertext = "Offered item"
                costtext = "Price"
                buysellbuttontext = "Buy"
        elseif buysell == "buy" then
                numbertext = "Requested item"
                costtext = "Payment"
                buysellbuttontext = "Sell"
        else
                return
        end
        local status = meta:get_string("status")
        if status == "" then status = "Unknown." end
        local message = meta:get_string("message")
        if message == "" then message = "No message." end
        local status_image
        if node.name == "easyvend:vendor_on" or node.name == "easyvend:depositor_on" then
                status_image = "easyvend_status_on.png"
        else
                status_image = "easyvend_status_off.png"
        end

        -- TODO: Expose number of items in stock

        local formspec = "size[8,7.3;]"
        .. bg
        .."label[3,-0.2;" .. minetest.formspec_escape(description) .. "]"

        .."image[7.5,0.2;0.5,1;" .. status_image .. "]"
        .."textarea[2.8,0.2;5.1,2;;Status: " .. minetest.formspec_escape(status) .. ";]"
        .."textarea[2.8,1.3;5.6,2;;Message: " .. minetest.formspec_escape(message) .. ";]"

                .."label[0,-0.15;"..numbertext.."]"
                .."label[0,1.2;"..costtext.."]"
        .."list[current_player;main;0,3.5;8,4;]"

        if configmode then
                local wear = "false"
                if meta:get_int("wear") == 1 then wear = "true" end
                formspec = formspec
                .."item_image_button[0,1.65;1,1;"..easyvend.currency..";easyvend.currency_image;]"
                .."list[current_name;item;0,0.35;1,1;]"
                .."listring[current_player;main]"
                .."listring[current_name;item]"
                .."field[1.3,0.65;1.5,1;number;;" .. number .. "]"
                .."tooltip[number;"..itemcounttooltip.."]"
                .."field[1.3,1.95;1.5,1;cost;;" .. cost .. "]"
                .."tooltip[cost;"..itemcounttooltip.."]"
                .."button[6,2.8;2,0.5;save;Confirm]"
                .."tooltip[save;Confirm configuration and activate machine (only for owner)]"
                local weartext, weartooltip
                if buysell == "buy" then
                        weartext = "Accept worn tools"
                        weartooltip = "If disabled, only tools in perfect condition will be bought from sellers (only settable by owner)"
                else
                        weartext = "Sell worn tools"
                        weartooltip = "If disabled, only tools in perfect condition will be sold (only settable by owner)"
                end
                if minetest.registered_tools[itemname] ~= nil then
                        formspec = formspec .."checkbox[2,2.4;wear;"..minetest.formspec_escape(weartext)..";"..wear.."]"
                        .."tooltip[wear;"..minetest.formspec_escape(weartooltip).."]"
                end
        else
                formspec = formspec
                .."item_image_button[0,1.65;1,1;"..easyvend.currency..";easyvend.currency_image;]"
                .."item_image_button[0,0.35;1,1;"..itemname..";item_image;]"
                .."label[1,1.85;×" .. cost .. "]"
                .."label[1,0.55;×" .. number .. "]"
                .."button[6,2.8;2,0.5;config;Configure]"
                if buysell == "sell" then
                        formspec = formspec .. "tooltip[config;Configure offered items and price (only for owner)]"
                else
                        formspec = formspec .. "tooltip[config;Configure requested items and payment (only for owner)]"
                end
                formspec = formspec .."button[0,2.8;2,0.5;buysell;"..buysellbuttontext.."]"
                if minetest.registered_tools[itemname] ~= nil then
                        local weartext
                        if meta:get_int("wear") == 0 then
                                if buysell == "buy" then
                                        weartext = "Only intact tools are bought."
                                else
                                        weartext = "Only intact tools are sold."
                                end
                        elseif buysell == "sell" then
                                weartext = "Warning: Might sell worn tools."
                        end
                        if weartext ~= nil then
                                formspec = formspec .."textarea[2.3,2.6;3,1;;"..minetest.formspec_escape(weartext)..";]"
                        end
                end
        end

        meta:set_string("formspec", formspec)
end

easyvend.machine_disable = function(pos, node, playername)
        if node.name == "easyvend:vendor_on" then
                easyvend.sound_disable(pos)
                minetest.swap_node(pos, {name="easyvend:vendor", param2 = node.param2})
                return true
        elseif node.name == "easyvend:depositor_on" then
                easyvend.sound_disable(pos)
                minetest.swap_node(pos, {name="easyvend:depositor", param2 = node.param2})
                return true
        else
                if playername ~= nil then
                        easyvend.sound_error(playername)
                end
                return false
        end
end

easyvend.machine_enable = function(pos, node)
        if node.name == "easyvend:vendor" then
                easyvend.sound_setup(pos)
                minetest.swap_node(pos, {name="easyvend:vendor_on", param2 = node.param2})
                return true
        elseif node.name == "easyvend:depositor" then
                easyvend.sound_setup(pos)
                minetest.swap_node(pos, {name="easyvend:depositor_on", param2 = node.param2})
                return true
        else
                return false
        end
end

easyvend.machine_check = function(pos, node)
        local active = true
        local status = "Ready."

        local chest = minetest.get_node({x=pos.x,y=pos.y-1,z=pos.z})
        local meta = minetest.get_meta(pos)
        local number = meta:get_int("number")
        local cost = meta:get_int("cost")
        local inv = meta:get_inventory()
        local itemstack = inv:get_stack("item",1)
        local itemname=meta:get_string("itemname")
        local machine_owner = meta:get_string("owner")
        local check_wear = meta:get_int("wear") == 0
        local chestdef = registered_chests[chest.name]
        local chest_meta, chest_inv

        if chestdef then
                chest_meta = minetest.get_meta({x=pos.x,y=pos.y-1,z=pos.z})
                chest_inv = chest_meta:get_inventory()

                if ( chest_meta:get_string(chestdef.meta_owner) == machine_owner and chest_inv ~= nil ) then
                        local buysell = easyvend.buysell(node.name)

                        local checkstack, checkitem
                        if buysell == "buy" then
                                checkitem = easyvend.currency
                        else
                                checkitem = itemname
                        end
                        local stock = 0
                        -- Count stock
                        -- FIXME: Ignore tools with bad wear level
                        for i=1,chest_inv:get_size(chestdef.inv_list) do
                                checkstack = chest_inv:get_stack(chestdef.inv_list, i)
                                if checkstack:get_name() == checkitem then
                                        stock = stock + checkstack:get_count()
                                end
                        end
                        meta:set_int("stock", stock)

                        if not itemstack:is_empty() then

                                local number_stack_max = itemstack:get_stack_max()

                                local stack = {name=itemname, count=number, wear=0, metadata=""}
                                local price = {name=easyvend.currency, count=cost, wear=0, metadata=""}

                                local chest_has, chest_free

                                local coststacks = math.modf(cost / cost_stack_max)
                                local costremainder = math.fmod(cost, cost_stack_max)
                                local numberstacks = math.modf(number / number_stack_max)
                                local numberremainder = math.fmod(number, number_stack_max)
                                local numberfree = numberstacks
                                local costfree = coststacks
                                if numberremainder > 0 then numberfree = numberfree + 1 end
                                if costremainder > 0 then costfree = costfree + 1 end

                                if buysell == "sell" then
                                        chest_has = easyvend.check_and_get_items(chest_inv, chestdef.inv_list, stack, check_wear)
                                        chest_free = chest_inv:room_for_item(chestdef.inv_list, price)
                                        if chest_has and chest_free then
                                                if cost <= cost_stack_max and number <= number_stack_max then
                                                        active = true
                                                elseif easyvend.free_slots(chest_inv, chestdef.inv_list) < costfree then
                                                        active = false
                                                        status = "No room in the machine’s storage!"
                                                end
                                        elseif not chest_has then
                                                active = false
                                                status = "The vending machine has insufficient materials!"
                                        elseif not chest_free then
                                                active = false
                                                status = "No room in the machine’s storage!"
                                        end
                                elseif buysell == "buy" then
                                        chest_has = easyvend.check_and_get_items(chest_inv, chestdef.inv_list, price, check_wear)
                                        chest_free = chest_inv:room_for_item(chestdef.inv_list, stack)
                                        if chest_has and chest_free then
                                                if cost <= cost_stack_max and number <= number_stack_max then
                                                        active = true
                                                elseif easyvend.free_slots(chest_inv, chestdef.inv_list) < numberfree then
                                                        active = false
                                                        status = "No room in the machine’s storage!"
                                                end
                                        elseif not chest_has then
                                                active = false
                                                status = "The depositing machine is out of money!"
                                        elseif not chest_free then
                                                active = false
                                                status = "No room in the machine’s storage!"
                                        end
                                end
                        else
                                active = false
                                status = "Awaiting configuration by owner."
                        end
                else
                        meta:set_int("stock", 0)
                        active = false
                        status = "Storage can’t be accessed because it is owned by a different person!"
                end
        else
                meta:set_int("stock", 0)
                active = false
                status = "No storage; machine needs a locked chest below it."
        end
        if meta:get_int("configmode") == 1 then
                active = false
                status = "Awaiting configuration by owner."
        end

        if itemname == easyvend.currency and number == cost and active then
            local jt = meta:get_int("joketimer")
            if jt > 0 then
                jt = jt - 1
            end
            if jt == 0 then
                if buysell == "sell" then
                    meta:set_string("message", "Item bought.")
                else
                    meta:set_string("message", "Item sold.")
                end
                jt = -1
            end
            meta:set_int("joketimer", jt)
        end
        meta:set_string("status", status)

        if not itemstack:is_empty() then
                if itemname == nil or itemname == "" then
                        itemname = itemstack:get_name()
                end
                meta:set_string("infotext", easyvend.make_infotext(node.name, machine_owner, cost, number, itemname))
        end
        itemname=itemstack:get_name()
        meta:set_string("itemname", itemname)

        local change
        if node.name == "easyvend:vendor" or node.name == "easyvend:depositor" then
                if active then change = easyvend.machine_enable(pos, node) end
        elseif node.name == "easyvend:vendor_on" or node.name == "easyvend:depositor_on" then
                if not active then change = easyvend.machine_disable(pos, node) end
        end
        easyvend.set_formspec(pos)
        return change
end

easyvend.on_receive_fields_config = function(pos, formname, fields, sender)
    local node = minetest.get_node(pos)
        local meta = minetest.get_meta(pos)
    local inv_self = meta:get_inventory()
    local itemstack = inv_self:get_stack("item",1)
    local buysell = easyvend.buysell(node.name)
 
    if fields.config then
        meta:set_int("configmode", 1)
        local was_active = easyvend.is_active(node.name)
        if was_active then
                meta:set_string("message", "Configuration mode activated; machine disabled.")
        else
                meta:set_string("message", "Configuration mode activated.")
        end
        easyvend.machine_check(pos, node)
        return
    end

    if not fields.save then
        return
    end

        local number = fields.number
        local cost = fields.cost

    --[[ Convenience function:
    When appending “s” or “S” to the number, it is multiplied
    by the maximum stack size.
    TODO: Expose this in user documentation ]]
    local number_stack_max = itemstack:get_stack_max()
    local ss = string.sub(number, #number, #number)
    if ss == "s" or ss == "S" then
        local n = tonumber(string.sub(number, 1, #number-1))
        if string.len(number) == 1 then n = 1 end
        if n ~= nil then
                number = n * number_stack_max
        end
    end
    ss = string.sub(cost, #cost, #cost)
    if ss == "s" or ss == "S" then
        local n = tonumber(string.sub(cost, 1, #cost-1))
        if string.len(cost) == 1 then n = 1 end
        if n ~= nil then
                cost = n * cost_stack_max
        end
    end
    number = tonumber(number)
    cost = tonumber(cost)

    local itemname=""

    local oldnumber = meta:get_int("number")
    local oldcost = meta:get_int("cost")
    local maxnumber = number_stack_max * slots_max
        
        if ( itemstack == nil or itemstack:is_empty() ) then
                meta:set_string("status", "Awaiting configuration by owner.")
                meta:set_string("message", "No item specified.")
                easyvend.sound_error(sender:get_player_name())
                easyvend.set_formspec(pos, sender)
                return
        elseif ( number == nil or number < 1 or number > maxnumber ) then
                if maxnumber > 1 then
                        meta:set_string("message", string.format("Invalid item count; must be between 1 and %d!", maxnumber))
                else
                        meta:set_string("message", "Invalid item count; must be exactly 1!")
                end
                meta:set_int("number", oldnumber)
                easyvend.sound_error(sender:get_player_name())
                easyvend.set_formspec(pos, sender)
                return
        elseif ( cost == nil or cost < 1 or cost > maxcost ) then
                if maxcost > 1 then
                        meta:set_string("message", string.format("Invalid cost; must be between 1 and %d!", maxcost))
                else
                        meta:set_string("message", "Invalid cost; must be exactly 1!")
                end
                meta:set_int("cost", oldcost)
                easyvend.sound_error(sender:get_player_name())
                easyvend.set_formspec(pos, sender)
                return
        end
        meta:set_int("number", number)
        meta:set_int("cost", cost)
        itemname=itemstack:get_name()
        meta:set_string("itemname", itemname)
        meta:set_int("configmode", 0)

        if itemname == easyvend.currency and number == cost and cost <= cost_stack_max then
            meta:set_string("message", "Configuration successful. I am feeling funny.")
            meta:set_int("joketimer", joketimer_start)
            meta:set_int("joke_id", easyvend.assign_joke(buysell))
        else
            meta:set_string("message", "Configuration successful.")
        end

        local change = easyvend.machine_check(pos, node)

        if not change then
                if (node.name == "easyvend:vendor_on" or node.name == "easyvend:depositor_on") then
                        easyvend.sound_setup(pos)
                else
                        easyvend.sound_disable(pos)
                end
        end
end

easyvend.make_infotext = function(nodename, owner, cost, number, itemstring)
        local iname = minetest.registered_items[itemstring].description
        if iname == nil then iname = itemstring end
        local d = ""
        local printitem, printcost
        if number == 1 then
                printitem = iname
        else
                printitem = string.format("%d×%s", number, iname)
        end
        if cost == 1 then
                printcost = easyvend.currency_desc
        else
                printcost = string.format("%d×%s", cost, easyvend.currency_desc)
        end
        if nodename == "easyvend:vendor_on" then
                d = string.format("Vending machine (owned by %s)\nSelling: %s\nPrice: %s", owner, printitem, printcost)
        elseif nodename == "easyvend:vendor" then
                d = string.format("Inactive vending machine (owned by %s)\nSelling: %s\nPrice: %s", owner, printitem, printcost)
        elseif nodename == "easyvend:depositor_on" then
                d = string.format("Depositing machine (owned by %s)\nBuying: %s\nPayment: %s", owner, printitem, printcost)
        elseif nodename == "easyvend:depositor" then
                d = string.format("Inactive depositing machine (owned by %s)\nBuying: %s\nPayment: %s", owner, printitem, printcost)
        end
        return d
end

easyvend.on_receive_fields_buysell = function(pos, formname, fields, sender)
    local sendername = sender:get_player_name()
    local meta = minetest.get_meta(pos)

    if not fields.buysell then
        return
    end

        local node = minetest.get_node(pos)
    local number = meta:get_int("number")
    local cost = meta:get_int("cost")
    local itemname=meta:get_string("itemname")
    local item=meta:get_inventory():get_stack("item", 1)
    local check_wear = meta:get_int("wear") == 0 and minetest.registered_tools[itemname] ~= nil

    local buysell = easyvend.buysell(node.name)
        
        local number_stack_max = item:get_stack_max()
        local maxnumber = number_stack_max * slots_max
        if ( number == nil or number < 1 or number > maxnumber ) or
        ( cost == nil or cost < 1 or cost > maxcost ) or
        ( itemname == nil or itemname=="") then
                meta:set_string("status", "Invalid item count or price!")
                easyvend.machine_disable(pos, node, sendername)
                return
        end

    
    local chest = minetest.get_node({x=pos.x,y=pos.y-1,z=pos.z})
    local chestdef = registered_chests[chest.name]
    if chestdef and sender and sender:is_player() then
        local chest_meta = minetest.get_meta({x=pos.x,y=pos.y-1,z=pos.z})
        local chest_inv = chest_meta:get_inventory()
        local player_inv = sender:get_inventory()
        if ( chest_meta:get_string(chestdef.meta_owner) == meta:get_string("owner") and chest_inv ~= nil and player_inv ~= nil ) then
            
            local stack = {name=itemname, count=number, wear=0, metadata=""} 
            local price = {name=easyvend.currency, count=cost, wear=0, metadata=""}
            local chest_has, player_has, chest_free, player_free, chest_out, player_out
            local msg = ""
            if buysell == "sell" then
                chest_has, chest_out = easyvend.check_and_get_items(chest_inv, "main", stack, check_wear)
                player_has, player_out = easyvend.check_and_get_items(player_inv, "main", price, check_wear)
                chest_free = chest_inv:room_for_item("main", price)
                player_free = player_inv:room_for_item("main", stack)
                if chest_has and player_has and chest_free and player_free then
                   if cost <= cost_stack_max and number <= number_stack_max then
                       easyvend.machine_enable(pos, node)
                       player_inv:remove_item("main", price)
                       if check_wear then
                           chest_inv:set_stack("main", chest_out[1].id, "")
                           player_inv:add_item("main", chest_out[1].item)
                       else
                           stack = chest_inv:remove_item("main", stack)
                           player_inv:add_item("main", stack)
                       end
                       chest_inv:add_item("main", price)
                       if itemname == easyvend.currency and number == cost and cost <= cost_stack_max then
                           meta:set_string("message", easyvend.get_joke(buysell, meta:get_int("joke_id")))
                           meta:set_int("joketimer", joketimer_start)
                       else
                           meta:set_string("message", "Item bought.")
                       end
                       easyvend.sound_vend(pos)
                       easyvend.machine_check(pos, node)
                   else
                       -- Large item counts (multiple stacks)
                       local coststacks = math.modf(cost / cost_stack_max)
                       local costremainder = math.fmod(cost, cost_stack_max)
                       local numberstacks = math.modf(number / number_stack_max)
                       local numberremainder = math.fmod(number, number_stack_max)
                       local numberfree = numberstacks
                       local costfree = coststacks
                       if numberremainder > 0 then numberfree = numberfree + 1 end
                       if costremainder > 0 then costfree = costfree + 1 end
                       if easyvend.free_slots(player_inv, "main") < numberfree then
                           if numberfree > 1 then
                               msg = string.format("No room in your inventory (%d empty slots required)!", numberfree)
                           else
                               msg = "No room in your inventory!"
                           end
                           meta:set_string("message", msg)
                       elseif easyvend.free_slots(chest_inv, "main") < costfree then
                           meta:set_string("status", "No room in the machine’s storage!")
                           easyvend.machine_disable(pos, node, sendername)
                       else
                           -- Remember items for transfer
                           local cheststacks = {}
                           easyvend.machine_enable(pos, node)
                           for i=1, coststacks do
                               price.count = cost_stack_max
                               player_inv:remove_item("main", price)
                           end
                           if costremainder > 0 then
                               price.count = costremainder
                               player_inv:remove_item("main", price)
                           end
                           if check_wear then
                               for o=1,#chest_out do
                                   chest_inv:set_stack("main", chest_out[o].id, "")
                               end
                           else
                               for i=1, numberstacks do
                                   stack.count = number_stack_max
                                   table.insert(cheststacks, chest_inv:remove_item("main", stack))
                               end
                           end
                           if numberremainder > 0 then
                               stack.count = numberremainder
                               table.insert(cheststacks, chest_inv:remove_item("main", stack))
                           end
                           for i=1, coststacks do
                               price.count = cost_stack_max
                               chest_inv:add_item("main", price)
                           end
                           if costremainder > 0 then
                               price.count = costremainder
                               chest_inv:add_item("main", price)
                           end
                           if check_wear then
                               for o=1,#chest_out do
                                   player_inv:add_item("main", chest_out[o].item)
                               end
                           else
                               for i=1,#cheststacks do
                                   player_inv:add_item("main", cheststacks[i])
                               end
                           end
                           meta:set_string("message", "Item bought.")
                           easyvend.sound_vend(pos)
                           easyvend.machine_check(pos, node)
                       end
                   end
                elseif chest_has and player_has then
                    if not player_free then
                        msg = "No room in your inventory!"
                        meta:set_string("message", msg)
                        easyvend.sound_error(sendername)
                    elseif not chest_free then
                        msg = "No room in the machine’s storage!"
                        meta:set_string("status", msg)
                        easyvend.machine_disable(pos, node, sendername)
                    end
                else
                    if not chest_has then
                        msg = "The vending machine has insufficient materials!"
                        meta:set_string("status", msg)
                        easyvend.machine_disable(pos, node, sendername)
                    elseif not player_has then
                        msg = "You can’t afford this item!"
                        meta:set_string("message", msg)
                        easyvend.sound_error(sendername)
                    end
                end
            else
                chest_has, chest_out = easyvend.check_and_get_items(chest_inv, "main", price, check_wear)
                player_has, player_out = easyvend.check_and_get_items(player_inv, "main", stack, check_wear)
                chest_free = chest_inv:room_for_item("main", stack)
                player_free = player_inv:room_for_item("main", price)
                if chest_has and player_has and chest_free and player_free then
                   if cost <= cost_stack_max and number <= number_stack_max then
                       easyvend.machine_enable(pos, node)
                       if check_wear then
                           player_inv:set_stack("main", player_out[1].id, "")
                           chest_inv:add_item("main", player_out[1].item)
                       else
                           stack = player_inv:remove_item("main", stack)
                           chest_inv:add_item("main", stack)
                       end
                       chest_inv:remove_item("main", price)
                       player_inv:add_item("main", price)
                       meta:set_string("status", "Ready.")
                       if itemname == easyvend.currency and number == cost and cost <= cost_stack_max then
                           meta:set_string("message", easyvend.get_joke(buysell, meta:get_int("joke_id")))
                           meta:set_int("joketimer", joketimer_start)
                       else
                           meta:set_string("message", "Item sold.")
                       end
                       easyvend.sound_deposit(pos)
                       easyvend.machine_check(pos, node)
                   else
                       -- Large item counts (multiple stacks)
                       local coststacks = math.modf(cost / cost_stack_max)
                       local costremainder = math.fmod(cost, cost_stack_max)
                       local numberstacks = math.modf(number / number_stack_max)
                       local numberremainder = math.fmod(number, number_stack_max)
                       local numberfree = numberstacks
                       local costfree = coststacks
                       if numberremainder > 0 then numberfree = numberfree + 1 end
                       if costremainder > 0 then costfree = costfree + 1 end
                       if easyvend.free_slots(player_inv, "main") < costfree then
                           if costfree > 1 then
                               msg = string.format("No room in your inventory (%d empty slots required)!", costfree)
                           else
                               msg = "No room in your inventory!"
                           end
                           meta:set_string("message", msg)
                           easyvend.sound_error(sendername)
                       elseif easyvend.free_slots(chest_inv, "main") < numberfree then
                           easyvend.machine_disable(pos, node, sendername)
                       else
                           easyvend.machine_enable(pos, node)
                           -- Remember removed items for transfer
                           local playerstacks = {}
                           for i=1, coststacks do
                               price.count = cost_stack_max
                               chest_inv:remove_item("main", price)
                           end
                           if costremainder > 0 then
                               price.count = costremainder
                               chest_inv:remove_item("main", price)
                           end
                           if check_wear then
                               for o=1,#player_out do
                                   player_inv:set_stack("main", player_out[o].id, "")
                               end
                           else
                               for i=1, numberstacks do
                                   stack.count = number_stack_max
                                   table.insert(playerstacks, player_inv:remove_item("main", stack))
                               end
                           end
                           if numberremainder > 0 then
                               stack.count = numberremainder
                               table.insert(playerstacks, player_inv:remove_item("main", stack))
                           end
                           for i=1, coststacks do
                               price.count = cost_stack_max
                               player_inv:add_item("main", price)
                           end
                           if costremainder > 0 then
                               price.count = costremainder
                               player_inv:add_item("main", price)
                           end
                           if check_wear then
                               for o=1,#player_out do
                                   chest_inv:add_item("main", player_out[o].item)
                               end
                           else
                               for i=1,#playerstacks do
                                   chest_inv:add_item("main", playerstacks[i])
                               end
                           end
                           meta:set_string("message", "Item sold.")
                           easyvend.sound_deposit(pos)
                           easyvend.machine_check(pos, node)
                       end
                    end
                elseif chest_has and player_has then
                    if not player_free then
                        msg = "No room in your inventory!"
                        meta:set_string("message", msg)
                        easyvend.sound_error(sendername)
                    elseif not chest_free then
                        msg = "No room in the machine’s storage!"
                        meta:set_string("status", msg)
                        easyvend.machine_disable(pos, node, sendername)
                    end
                else
                    if not player_has then
                        msg = "You have insufficient materials!"
                        meta:set_string("message", msg)
                        easyvend.sound_error(sendername)
                    elseif not chest_has then
                        msg = "The depositing machine is out of money!"
                        meta:set_string("status", msg)
                        easyvend.machine_disable(pos, node, sendername)
                    end
                end
            end
        else
            meta:set_string("status", "Storage can’t be accessed because it is owned by a different person!")
            easyvend.machine_disable(pos, node, sendername)
        end
    else
        if sender and sender:is_player() then
            meta:set_string("status", "No storage; machine needs a locked chest below it.")
            easyvend.machine_disable(pos, node, sendername)
        end
    end

    easyvend.set_formspec(pos, sender)
    
end

easyvend.after_place_node = function(pos, placer)
    local node = minetest.get_node(pos)
        local meta = minetest.get_meta(pos)
    local inv = meta:get_inventory()
    local player_name = placer:get_player_name()
    inv:set_size("item", 1)
    inv:set_size("gold", 1)
    
    inv:set_stack( "gold", 1, easyvend.currency )

    local d = ""
    if node.name == "easyvend:vendor" then
        d = string.format("Inactive vending machine (owned by %s)", player_name)
        meta:set_int("wear", 1)
    elseif node.name == "easyvend:depositor" then
        d = string.format("Inactive depositing machine (owned by %s)", player_name)
        meta:set_int("wear", 0)
    end
    meta:set_string("infotext", d)
    local chest = minetest.get_node({x=pos.x,y=pos.y-1,z=pos.z})
    meta:set_string("status", "Awaiting configuration by owner.")
    meta:set_string("message", "Welcome! Please prepare the machine.")
    meta:set_int("number", 1)
    meta:set_int("cost", 1)
    meta:set_int("stock", -1)
    meta:set_int("configmode", 1)
    meta:set_int("joketimer", -1)
    meta:set_int("joke_id", 1)
        meta:set_string("itemname", "")

        meta:set_string("owner", player_name or "")
    
    easyvend.set_formspec(pos, placer)
end

easyvend.can_dig = function(pos, player)
    local meta = minetest.get_meta(pos)
    local name = player:get_player_name()
    -- Owner can always dig shop
    if meta:get_string("owner") == name then
        return true
    end
    local chest = minetest.get_node({x=pos.x,y=pos.y-1,z=pos.z})
    local meta_chest = minetest.get_meta({x=pos.x,y=pos.y-1,z=pos.z});
    if registered_chests[chest.name] then
         if player and player:is_player() then
            local owner_chest = meta_chest:get_string(registered_chests[chest.name].meta_owner)
            if name == owner_chest then
                return true --chest owner can also dig shop
            end
         end
         return false
    else
        return true --if no chest, enyone can dig this shop
    end
end

easyvend.on_receive_fields = function(pos, formname, fields, sender)
        local meta = minetest.get_meta(pos)
        local node = minetest.get_node(pos)
        local owner = meta:get_string("owner")
        local sendername = sender:get_player_name(sender)
    
        if fields.config or fields.save or fields.usermode then
                if sender:get_player_name() == owner then
                        easyvend.on_receive_fields_config(pos, formname, fields, sender)
                else
                        meta:set_string("message", "Only the owner may change the configuration.")
                        easyvend.sound_error(sendername)
                        easyvend.set_formspec(pos, sender)
                        return
                end
        elseif fields.wear ~= nil then
                if sender:get_player_name() == owner then
                        if fields.wear == "true" then
                                if easyvend.buysell(node.name) == "buy" then
                                        meta:set_string("message", "Used tools are now accepted.")
                                else
                                        meta:set_string("message", "Used tools are now for sale.")
                                end
                                meta:set_int("wear", 1)
                        elseif fields.wear == "false" then
                                if easyvend.buysell(node.name) == "buy" then
                                        meta:set_string("message", "Used tools are now rejected.")
                                else
                                        meta:set_string("message", "Used tools won’t be sold anymore.")
                                end
                                meta:set_int("wear", 0)
                        end
                        easyvend.set_formspec(pos, sender)
                        return
                else
                        meta:set_string("message", "Only the owner may change the configuration.")
                        easyvend.sound_error(sendername)
                        easyvend.set_formspec(pos, sender)
                        return
                end
        elseif fields.buysell then
                easyvend.on_receive_fields_buysell(pos, formname, fields, sender)
        end
end

-- Jokes: Appear when machine exchanges currency for currency at equal rate

-- Vendor
local jokes_vendor = {
        "Thank you. You have made a vending machine very happy.",
        "Humans have a strange sense of humor.",
        "Let’s get this over with …",
        "Item “bought”.",
        "Tit for tat.",
        "Do you realize what you’ve just bought?",
}
-- Depositor
local jokes_depositor = {
        "Thank you, the money started to smell inside.",
        "Money doesn’t grow on trees, you know?",
        "Sanity sold.",
        "Well, that was an awkward exchange.",
        "Are you having fun?",
        "Is this really trading?",
}

easyvend.assign_joke = function(buysell)
        local jokes
        if buysell == "sell" then
                jokes = jokes_vendor
        elseif buysell == "buy" then
                jokes = jokes_depositor
        end
        local r = math.random(1,#jokes)
        return r
end

easyvend.get_joke = function(buysell, id)
        local joke
        if buysell == nil or id == nil then
                -- Fallback message (should never happen)
                return "Items exchanged."
        end
        if buysell == "sell" then
                joke = jokes_vendor[id]
                if joke == nil then joke = jokes_vendor[1] end
        elseif buysell == "buy" then
                joke = jokes_depositor[id]
                if joke == nil then joke = jokes_depositor[1] end
        end
        return joke
end

easyvend.sound_error = function(playername) 
        minetest.sound_play("easyvend_error", {to_player = playername, gain = 0.25})
end

easyvend.sound_setup = function(pos)
        minetest.sound_play("easyvend_activate", {pos = pos, gain = 0.5, max_hear_distance = 12,})
end

easyvend.sound_disable = function(pos)
        minetest.sound_play("easyvend_disable", {pos = pos, gain = 0.9, max_hear_distance = 12,})
end

easyvend.sound_vend = function(pos) 
        minetest.sound_play("easyvend_vend", {pos = pos, gain = 0.4, max_hear_distance = 5,})
end

easyvend.sound_deposit = function(pos)
        minetest.sound_play("easyvend_deposit", {pos = pos, gain = 0.4, max_hear_distance = 5,})
end

easyvend.allow_metadata_inventory_put = function(pos, listname, index, stack, player)
    if listname=="item" then
        local meta = minetest.get_meta(pos);
        local owner = meta:get_string("owner")
        local name = player:get_player_name()
        if name == owner then
            local inv = meta:get_inventory()
            if stack==nil then
                inv:set_stack( "item", 1, nil )
            else
                inv:set_stack( "item", 1, stack:get_name() )
                meta:set_string("itemname", stack:get_name())
                easyvend.set_formspec(pos, player)
            end
        end
    end
        return 0
end

easyvend.allow_metadata_inventory_take = function(pos, listname, index, stack, player)
        return 0
end

easyvend.allow_metadata_inventory_move = function(pos, from_list, from_index, to_list, to_index, count, player)
        return 0
end

minetest.register_abm({
        nodenames = {"easyvend:vendor", "easyvend:vendor_on", "easyvend:depositor", "easyvend:depositor_on"},
        interval = 5,
        chance = 1,
        catch_up = false,
        action = function(pos, node, active_object_count, active_object_count_wider)
                easyvend.machine_check(pos, node)
        end
})