-- Advanced NPC System (Created by Jiddo),
-- Modified by Talaturen.
-- Modified by Elf.
-- Edited by Limos.

if(Modules == nil) then
    -- Constants used to separate buying from selling.
    SHOPMODULE_SELL_ITEM = 1
    SHOPMODULE_BUY_ITEM = 2
    SHOPMODULE_BUY_ITEM_CONTAINER = 3

    -- Constants used for shop mode. Notice: addBuyableItemContainer is working on all modes
    SHOPMODULE_MODE_TALK = 1 -- Old system used before Tibia 8.2: sell/buy item name
    SHOPMODULE_MODE_TRADE = 2 -- Trade window system introduced in Tibia 8.2
    SHOPMODULE_MODE_BOTH = 3 -- Both working at one time

    -- Used in shop mode
    SHOPMODULE_MODE = SHOPMODULE_MODE_BOTH

    -- Constants used for outfit giving mode
    OUTFITMODULE_FUNCTION_OLD = doPlayerAddOutfit -- Gives outfit through look type
    OUTFITMODULE_FUNCTION_NEW = doPlayerAddOutfitId -- Gives outfit through outfit id

    -- Used in outfit module
    OUTFITMODULE_FUNCTION = OUTFITMODULE_FUNCTION_NEW
    if(OUTFITMODULE_FUNCTION == nil) then
        OUTFITMODULE_FUNCTION = OUTFITMODULE_FUNCTION_OLD
    end

    Modules = {
        parseableModules = {}
    }

    StdModule = {}

    -- These callback function must be called with parameters.npcHandler = npcHandler in the parameters table or they will not work correctly.
    -- Notice: The members of StdModule have not yet been tested. If you find any bugs, please report them to me.
    -- Usage:
        -- keywordHandler:addKeyword({'offer'}, StdModule.say, {npcHandler = npcHandler, text = 'I sell many powerful melee weapons.'})
    function StdModule.say(cid, message, keywords, parameters, node)
        local npcHandler = parameters.npcHandler
        if(npcHandler == nil) then
            error('StdModule.say called without any npcHandler instance.')
        end

        local onlyFocus = (parameters.onlyFocus == nil or parameters.onlyFocus == true)
        if(not npcHandler:isFocused(cid) and onlyFocus) then
            return false
        end

        local parseInfo = {[TAG_PLAYERNAME] = getCreatureName(cid)}
        npcHandler:say(npcHandler:parseMessage(parameters.text or parameters.message, parseInfo), cid, parameters.publicize and true)
        if(parameters.reset == true) then
            npcHandler:resetNpc()
        elseif(parameters.moveup ~= nil and type(parameters.moveup) == 'number') then
            npcHandler.keywordHandler:moveUp(parameters.moveup)
        end

        return true
    end

    -- This function is for the NPCS.. by VANKKKKKKKKKKKKKKK!
    function StdModule.allbless(cid, message, keywords, parameters, node)
        local npcHandler = parameters.npcHandler
        if(npcHandler == nil) then
            print('[Warning - ' .. getCreatureName(getNpcId()) .. '] NpcSystem:', 'StdModule.bless - Call without any npcHandler instance.')
            return false
        end

        if(not getBooleanFromString(getConfigValue('blessings'))) then
            npcHandler:say("Sorry, but Gods moved back my permission to bless anyone.", cid)
            return false
        end

        if(not npcHandler:isFocused(cid)) then
            return false
        end

        local price = 100000
        local pricevip = 60000
        if(parameters.number == 1) then
            if getPlayerVipDays(cid) > 0 then
                if(not doPlayerRemoveMoney(cid, pricevip)) then
                    npcHandler:say("You don't have enough money for blessing.", cid)
                else
                    npcHandler:say("You are VIP, I gave to you a discount of 40% on all blessings! Go and fulfil your destiny.", cid)
                    doPlayerAddBlessing(cid, 1)
                    doPlayerAddBlessing(cid, 2)
                    doPlayerAddBlessing(cid, 3)
                    doPlayerAddBlessing(cid, 4)
                    doPlayerAddBlessing(cid, 5)
                    --doPlayerSetPVPBlessing(cid)
                end
            end
            if getPlayerVipDays(cid) < 1 then
                if(not doPlayerRemoveMoney(cid, price)) then
                    npcHandler:say("You don't have enough money for blessing.", cid)
                else
                    npcHandler:say("All blessings were given to you! Go and fulfil your destiny.", cid)
                    doPlayerAddBlessing(cid, 1)
                    doPlayerAddBlessing(cid, 2)
                    doPlayerAddBlessing(cid, 3)
                    doPlayerAddBlessing(cid, 4)
                    doPlayerAddBlessing(cid, 5)
                    --doPlayerSetPVPBlessing(cid)
                end
            end
        end

        npcHandler:resetNpc(cid)
        return true
    end

    --Usage:
        -- local node1 = keywordHandler:addKeyword({'promot'}, StdModule.say, {npcHandler = npcHandler, text = 'I can promote you for 20000 brozne coins. Do you want me to promote you?'})
        --      node1:addChildKeyword({'yes'}, StdModule.promotePlayer, {npcHandler = npcHandler, cost = 20000, promotion = 1, level = 20}, text = 'Congratulations! You are now promoted.')
        --      node1:addChildKeyword({'no'}, StdModule.say, {npcHandler = npcHandler, text = 'Alright then, come back when you are ready.'}, reset = true)
    function StdModule.promotePlayer(cid, message, keywords, parameters, node)
        local npcHandler = parameters.npcHandler
        if(npcHandler == nil) then
            print('[Warning - ' .. getCreatureName(getNpcId()) .. '] NpcSystem:', 'StdModule.promotePlayer - Call without any npcHandler instance.')
            return false
        end

        if(not npcHandler:isFocused(cid)) then
            return false
        end

        if(isPremium(cid) or not getBooleanFromString(getConfigValue('premiumForPromotion'))) then
            if(getPlayerPromotionLevel(cid) >= parameters.promotion) then
                npcHandler:say('You are already promoted!', cid)
            elseif(getPlayerLevel(cid) < parameters.level) then
                npcHandler:say('I am sorry, but I can only promote you once you have reached level ' .. parameters.level .. '.', cid)
            elseif(not doPlayerRemoveMoney(cid, parameters.cost)) then
                npcHandler:say('You do not have enough money!', cid)
            else
                doPlayerSetPromotionLevel(cid, parameters.promotion)
                npcHandler:say(parameters.text, cid)
            end
        else
            npcHandler:say("You need a premium account in order to get promoted.", cid)
        end

        npcHandler:resetNpc(cid)
        return true
    end

    --------------- END

    --Usage:
        -- local node1 = keywordHandler:addKeyword({'promot'}, StdModule.say, {npcHandler = npcHandler, text = 'I can promote you for 20000 brozne coins. Do you want me to promote you?'})
        --      node1:addChildKeyword({'yes'}, StdModule.promotePlayer, {npcHandler = npcHandler, cost = 20000, promotion = 1, level = 20}, text = 'Congratulations! You are now promoted.')
        --      node1:addChildKeyword({'no'}, StdModule.say, {npcHandler = npcHandler, text = 'Alright then, come back when you are ready.'}, reset = true)
    function StdModule.promotePlayer(cid, message, keywords, parameters, node)
        local npcHandler = parameters.npcHandler
        if(npcHandler == nil) then
            error('StdModule.promotePlayer called without any npcHandler instance.')
        end

        if(not npcHandler:isFocused(cid)) then
            return false
        end

        if(isPlayerPremiumCallback(cid) or not getBooleanFromString(getConfigValue('premiumForPromotion')) or not(parameters.premium)) then
            if(getPlayerPromotionLevel(cid) >= parameters.promotion) then
                npcHandler:say('You are already promoted!', cid)
            elseif(getPlayerLevel(cid) < parameters.level) then
                npcHandler:say('I am sorry, but I can only promote you once you have reached level ' .. parameters.level .. '.', cid)
            elseif(not doPlayerRemoveMoney(cid, parameters.cost)) then
                npcHandler:say('You do not have enough money!', cid)
            else
                setPlayerPromotionLevel(cid, parameters.promotion)
                npcHandler:say(parameters.text, cid)
            end
        else
            npcHandler:say("You need a premium account in order to get promoted.", cid)
        end

        npcHandler:resetNpc()
        return true
    end

    function StdModule.learnSpell(cid, message, keywords, parameters, node)
        local npcHandler = parameters.npcHandler
        if(npcHandler == nil) then
            error('StdModule.learnSpell called without any npcHandler instance.')
        end

        if(not npcHandler:isFocused(cid)) then
            return false
        end

        if(isPlayerPremiumCallback(cid) or not(parameters.premium)) then
            if(getPlayerLearnedInstantSpell(cid, parameters.spellName)) then
                npcHandler:say('You already know this spell.', cid)
            elseif(getPlayerLevel(cid) < parameters.level) then
                npcHandler:say('You need to obtain a level of ' .. parameters.level .. ' or higher to be able to learn ' .. parameters.spellName .. '.', cid)
            elseif(getPlayerVocation(cid) ~= parameters.vocation and getPlayerVocation(cid) ~= parameters.vocation + 4 and vocation ~= 9) then
                npcHandler:say('This spell is not for your vocation', cid)
            elseif(not doPlayerRemoveMoney(cid, parameters.price)) then
                npcHandler:say('You do not have enough money, this spell costs ' .. parameters.price .. ' gold coins.', cid)
            else
                npcHandler:say('You have learned ' .. parameters.spellName .. '.', cid)
                playerLearnInstantSpell(cid, parameters.spellName)
            end
        else
            npcHandler:say('You need a premium account in order to buy ' .. parameters.spellName .. '.', cid)
        end

        npcHandler:resetNpc()
        return true
    end

    function StdModule.bless(cid, message, keywords, parameters, node)
        local npcHandler = parameters.npcHandler
        if(npcHandler == nil) then
            error('StdModule.bless called without any npcHandler instance.')
        end

        if(not npcHandler:isFocused(cid)) then
            return false
        end

        if(isPlayerPremiumCallback(cid) or not getBooleanFromString(getConfigValue('blessingsOnlyPremium')) or not parameters.premium) then
            local price = parameters.baseCost
            if(getPlayerLevel(cid) > parameters.startLevel) then
                price = (price + ((math.min(parameters.endLevel, getPlayerLevel(cid)) - parameters.startLevel) * parameters.levelCost))
            end

            if(getPlayerBlessing(cid, parameters.number)) then
                npcHandler:say("Gods have already blessed you with this blessing!", cid)
            elseif(not doPlayerRemoveMoney(cid, price)) then
                npcHandler:say("You don't have enough money for blessing.", cid)
            else
                npcHandler:say("You have been blessed by one of the five gods!", cid)
                doPlayerAddBlessing(cid, parameters.number)
            end
        else
            npcHandler:say('You need a premium account in order to be blessed.', cid)
        end

        npcHandler:resetNpc()
        return true
    end

    function StdModule.travel(cid, message, keywords, parameters, node)
        local npcHandler = parameters.npcHandler
        if(npcHandler == nil) then
            error('StdModule.travel called without any npcHandler instance.')
        end

        if(not npcHandler:isFocused(cid)) then
            return false
        end

        local storage, pzLocked = parameters.storageValue or (EMPTY_STORAGE + 1), parameters.allowLocked or false
        if(parameters.premium and not isPlayerPremiumCallback(cid)) then
            npcHandler:say('I can only allow premium players to travel with me.', cid)
        elseif(parameters.level ~= nil and getPlayerLevel(cid) < parameters.level) then
            npcHandler:say('You must reach level ' .. parameters.level .. ' before I can let you go there.', cid)
        elseif(parameters.storageId ~= nil and getPlayerStorageValue(cid, parameters.storageId) < storage) then
            npcHandler:say(parameters.storageInfo or 'You may not travel there!', cid)
        elseif(not pzLocked and isPlayerPzLocked(cid)) then
            npcHandler:say('Get out of there with this blood!', cid)
        elseif(not doPlayerRemoveMoney(cid, parameters.cost)) then
            npcHandler:say('You do not have enough money.', cid)
        else
            npcHandler:say('It was a pleasure doing business with you.', cid)
            npcHandler:releaseFocus(cid)

            doTeleportThing(cid, parameters.destination, false)
            doSendMagicEffect(parameters.destination, CONST_ME_TELEPORT)
        end

        npcHandler:resetNpc()
        return true
    end

    FocusModule = {
        npcHandler = nil
    }

    -- Creates a new instance of FocusModule without an associated NpcHandler.
    function FocusModule:new()
        local obj = {}
        setmetatable(obj, self)
        self.__index = self
        return obj
    end

    -- Inits the module and associates handler to it.
    function FocusModule:init(handler)
        self.npcHandler = handler
        for i, word in pairs(FOCUS_GREETWORDS) do
            local obj = {}
            table.insert(obj, word)
            obj.callback = FOCUS_GREETWORDS.callback or FocusModule.messageMatcher
            handler.keywordHandler:addKeyword(obj, FocusModule.onGreet, {module = self})
        end

        for i, word in pairs(FOCUS_FAREWELLWORDS) do
            local obj = {}
            table.insert(obj, word)
            obj.callback = FOCUS_FAREWELLWORDS.callback or FocusModule.messageMatcher
            handler.keywordHandler:addKeyword(obj, FocusModule.onFarewell, {module = self})
        end
    end

    -- Greeting callback function.
    function FocusModule.onGreet(cid, message, keywords, parameters)
        parameters.module.npcHandler:onGreet(cid)
        return true
    end

    -- UnGreeting callback function.
    function FocusModule.onFarewell(cid, message, keywords, parameters)
        if(not parameters.module.npcHandler:isFocused(cid)) then
            return false
        end

        parameters.module.npcHandler:onFarewell(cid)
        return true
    end

    -- Custom message matching callback function for greeting messages.
    function FocusModule.messageMatcher(keywords, message)
        local spectators = getSpectators(getCreaturePosition(getNpcId()), 7, 7)
        for i, word in pairs(keywords) do
            if(type(word) == 'string') then
                if(string.find(message, word) and not string.find(message, '[%w+]' .. word) and not string.find(message, word .. '[%w+]')) then
                    if(string.find(message, getCreatureName(getNpcId()))) then
                        return true
                    end

                    for i, uid in ipairs(spectators) do
                        if(string.find(message, getCreatureName(uid))) then
                            return false
                        end
                    end

                    return true
                end
            end
        end

        return false
    end

    KeywordModule = {
        npcHandler = nil
    }
    -- Add it to the parseable module list.
    Modules.parseableModules['module_keywords'] = KeywordModule

    function KeywordModule:new()
        local obj = {}
        setmetatable(obj, self)
        self.__index = self
        return obj
    end

    function KeywordModule:init(handler)
        self.npcHandler = handler
    end

    -- Parses all known parameters.
    function KeywordModule:parseParameters()
        local ret = NpcSystem.getParameter('keywords')
        if(ret ~= nil) then
            self:parseKeywords(ret)
        end
    end

    function KeywordModule:parseKeywords(data)
        local n = 1
        for keys in string.gmatch(data, '[^;]+') do
            local i = 1

            local keywords = {}
            for temp in string.gmatch(keys, '[^,]+') do
                table.insert(keywords, temp)
                i = i + 1
            end

            if(i ~= 1) then
                local reply = NpcSystem.getParameter('keyword_reply' .. n)
                if(reply ~= nil) then
                    self:addKeyword(keywords, reply)
                else
                    print('[Warning] NpcSystem:', 'Parameter \'' .. 'keyword_reply' .. n .. '\' missing. Skipping...')
                end
            else
                print('[Warning] NpcSystem:', 'No keywords found for keyword set #' .. n .. '. Skipping...')
            end

            n = n + 1
        end
    end

    function KeywordModule:addKeyword(keywords, reply)
        self.npcHandler.keywordHandler:addKeyword(keywords, StdModule.say, {npcHandler = self.npcHandler, onlyFocus = true, text = reply, reset = true})
    end

    TravelModule = {
        npcHandler = nil,
        destinations = nil,
        yesNode = nil,
        noNode = nil,
    }
    -- Add it to the parseable module list.
    Modules.parseableModules['module_travel'] = TravelModule

    function TravelModule:new()
        local obj = {}
        setmetatable(obj, self)
        self.__index = self
        return obj
    end

    function TravelModule:init(handler)
        self.npcHandler = handler
        self.yesNode = KeywordNode:new(SHOP_YESWORD, TravelModule.onConfirm, {module = self})
        self.noNode = KeywordNode:new(SHOP_NOWORD, TravelModule.onDecline, {module = self})

        self.destinations = {}
    end

    -- Parses all known parameters.
    function TravelModule:parseParameters()
        local ret = NpcSystem.getParameter('travel_destinations')
        if(ret ~= nil) then
            self:parseDestinations(ret)
            for _, word in ipairs({'destination', 'list', 'where', 'travel'}) do
                self.npcHandler.keywordHandler:addKeyword({word}, TravelModule.listDestinations, {module = self})
            end
        end
    end

    function TravelModule:parseDestinations(data)
        for destination in string.gmatch(data, '[^;]+') do
            local i, name, pos, cost, premium, level, storage = 1, nil, {x = nil, y = nil, z = nil}, nil, false
            for tmp in string.gmatch(destination, '[^,]+') do
                if(i == 1) then
                    name = tmp
                elseif(i == 2) then
                    pos.x = tonumber(tmp)
                elseif(i == 3) then
                    pos.y = tonumber(tmp)
                elseif(i == 4) then
                    pos.z = tonumber(tmp)
                elseif(i == 5) then
                    cost = tonumber(tmp)
                elseif(i == 6) then
                    premium = getBooleanFromString(tmp)
                else
                    print('[Warning] NpcSystem:', 'Unknown parameter found in travel destination parameter.', tmp, destination)
                end

                i = i + 1
            end

            if(name ~= nil and pos.x ~= nil and pos.y ~= nil and pos.z ~= nil and cost ~= nil) then
                self:addDestination(name, pos, cost, premium)
            else
                print('[Warning] NpcSystem:', 'Parameter(s) missing for travel destination:', name, pos, cost, premium)
            end
        end
    end

    function TravelModule:addDestination(name, position, price, premium)
        table.insert(self.destinations, name)
        local parameters = {
            cost = price,
            destination = position,
            premium = premium,
            module = self
        }

        local keywords, bringwords = {}, {}
        table.insert(keywords, name)

        table.insert(bringwords, 'bring me to ' .. name)
        self.npcHandler.keywordHandler:addKeyword(bringwords, TravelModule.bring, parameters)

        local node = self.npcHandler.keywordHandler:addKeyword(keywords, TravelModule.travel, parameters)
        node:addChildKeywordNode(self.yesNode)
        node:addChildKeywordNode(self.noNode)
    end

    function TravelModule.travel(cid, message, keywords, parameters, node)
        local module = parameters.module
        if(not module.npcHandler:isFocused(cid)) then
            return false
        end

        module.npcHandler:say('Do you want to travel to ' .. keywords[1] .. ' for ' .. parameters.cost .. ' gold coins?', cid)
        return true
    end

    function TravelModule.onConfirm(cid, message, keywords, parameters, node)
        local module = parameters.module
        if(not module.npcHandler:isFocused(cid)) then
            return false
        end

        local parent = node:getParent():getParameters()
        if(isPlayerPremiumCallback(cid) or not parent.premium) then
            if(not isPlayerPzLocked(cid)) then
                if(doPlayerRemoveMoney(cid, parent.cost)) then
                    module.npcHandler:say('It was a pleasure doing business with you.', cid)
                    module.npcHandler:releaseFocus(cid)

                    doTeleportThing(cid, parent.destination, true)
                    doSendMagicEffect(parent.destination, CONST_ME_TELEPORT)
                else
                    module.npcHandler:say('You do not have enough money.', cid)
                end
            else
                module.npcHandler:say('Get out of there with this blood!', cid)
            end
        else
            modulenpcHandler:say('I can only allow premium players to travel there.', cid)
        end

        module.npcHandler:resetNpc()
        return true
    end

    -- onDecline keyword callback function. Generally called when the player sais 'no' after wanting to buy an item.
    function TravelModule.onDecline(cid, message, keywords, parameters, node)
        local module = parameters.module
        if(not module.npcHandler:isFocused(cid)) then
            return false
        end

        module.npcHandler:say(module.npcHandler:parseMessage(module.npcHandler:getMessage(MESSAGE_DECLINE), {[TAG_PLAYERNAME] = getCreatureName(cid)}), cid)
        module.npcHandler:resetNpc()
        return true
    end

    function TravelModule.bring(cid, message, keywords, parameters, node)
        local module = parameters.module
        if(not module.npcHandler:isFocused(cid)) then
            return false
        end

        if((isPlayerPremiumCallback(cid) or not parameters.premium) and not isPlayerPzLocked(cid) and doPlayerRemoveMoney(cid, parameters.cost)) then
            module.npcHandler:say('Sure!', cid)
            module.npcHandler:releaseFocus(cid)

            doTeleportThing(cid, parameters.destination, false)
            doSendMagicEffect(parameters.destination, CONST_ME_TELEPORT)
        end

        module.npcHandler:releaseFocus(cid)
        return true
    end

    function TravelModule.listDestinations(cid, message, keywords, parameters, node)
        local module = parameters.module
        if(not module.npcHandler:isFocused(cid)) then
            return false
        end

        local msg = nil
        for _, destination in ipairs(module.destinations) do
            if(msg ~= nil) then
                msg = msg .. ", "
            else
                msg = ""
            end

            msg = msg .. "{" .. destination .. "}"
        end

        module.npcHandler:say(msg .. ".", cid)
        module.npcHandler:resetNpc()
        return true
    end

    OutfitModule = {
        npcHandler = nil,
        outfits = nil,
        yesNode = nil,
        noNode = nil,
    }
    -- Add it to the parseable module list.
    Modules.parseableModules['module_outfit'] = OutfitModule

    function OutfitModule:new()
        if(OUTFITMODULE_FUNCTION == nil) then
            return nil
        end

        local obj = {}
        setmetatable(obj, self)
        self.__index = self
        return obj
    end

    function OutfitModule:init(handler)
        self.npcHandler = handler
        self.yesNode = KeywordNode:new(SHOP_YESWORD, OutfitModule.onConfirm, {module = self})
        self.noNode = KeywordNode:new(SHOP_NOWORD, OutfitModule.onDecline, {module = self})

        self.outfits = {}
    end

    -- Parses all known parameters.
    function OutfitModule:parseParameters()
        local ret = NpcSystem.getParameter('outfits')
        if(ret ~= nil) then
            self:parseKeywords(ret)
            for _, word in ipairs({'outfits', 'addons'}) do
                self.npcHandler.keywordHandler:addKeyword({word}, OutfitModule.listOutfits, {module = self})
            end
        end
    end

    function OutfitModule:parseKeywords(data)
        local n = 1
        for outfit in string.gmatch(data, '[^;]+') do
            local i, keywords = 1, {}
            for tmp in string.gmatch(outfit, '[^,]+') do
                table.insert(keywords, tmp)
                i = i + 1
            end

            if(i > 0) then
                local ret = NpcSystem.getParameter('outfit' .. n)
                if(ret ~= nil) then
                    self:parseList(keywords, ret)
                else
                    print('[Warning] NpcSystem:', 'Missing \'outfit' .. n .. '\' parameter, skipping...')
                end
            else
                print('[Warning] NpcSystem:', 'No keywords found for outfit set #' .. n .. ', skipping...')
            end

            n = n + 1
        end
    end

    function OutfitModule:parseList(keywords, data)
        local outfit, items = nil, {}
        for list in string.gmatch(data, '[^;]+') do
            local a, b, c, d, e = nil, nil, nil, nil, 1
            for tmp in string.gmatch(list, '[^,]+') do
                if(e == 1) then
                    a = tmp
                elseif(e == 2) then
                    b = tmp
                elseif(e == 3) then
                    c = tmp
                elseif(e == 4) then
                    d = tmp
                else
                    print('[Warning] NpcSystem:', 'Unknown parameter found in outfit list while parsing ' .. (outfit == nil and 'outfit' or 'item') .. '.', tmp, list)
                end

                e = e + 1
            end

            if(outfit == nil) then
                outfit = {tonumber(a), tonumber(b), getBooleanFromString(c), d}
            elseif(a ~= nil) then
                local tmp = tonumber(a)
                if((tmp ~= nil or tostring(a) == "money") and b ~= nil and c ~= nil) then
                    a = tmp or 20000
                    tmp = tonumber(d)
                    if(tmp == nil) then
                        tmp = -1
                    end

                    items[a] = {b, tmp, c}
                else
                    print('[Warning] NpcSystem:', 'Missing parameter(s) for outfit items.', b, c, d)
                end
            else
                print('[Warning] NpcSystem:', 'Missing base parameter for outfit items.', a)
            end
        end

        if(type(outfit) == 'table') then
            local tmp = true
            for i = 1, 2 do
                if(outfit[i] == nil) then
                    tmp = false
                    break
                end
            end

            if(tmp and table.maxn(items) > 0) then
                self:addOutfit(keywords, outfit, items)
            else
                print('[Warning] NpcSystem:', 'Invalid outfit, addon or empty items pool.', data)
            end
        end
    end

    function OutfitModule:addOutfit(keywords, outfit, items)
        table.insert(self.outfits, keywords[1])
        local parameters = {
            outfit = outfit[1],
            addon = outfit[2],
            premium = outfit[3],
            gender = nil,
            items = items,
            module = self
        }

        if(outfit[4] ~= nil) then
            local tmp = string.lower(tostring(outfit[5]))
            if(tmp == 'male' or tmp == '1') then
                parameters.gender = 1
            elseif(tmp == 'female' or tmp == '0') then
                parameters.gender = 0
            end
        end

        for i, name in pairs(keywords) do
            local words = {}
            table.insert(words, name)

            local node = self.npcHandler.keywordHandler:addKeyword(words, OutfitModule.obtain, parameters)
            node:addChildKeywordNode(self.yesNode)
            node:addChildKeywordNode(self.noNode)
        end
    end

    function OutfitModule.obtain(cid, message, keywords, parameters, node)
        local module = parameters.module
        if(not module.npcHandler:isFocused(cid)) then
            return false
        end

        local items = nil
        for k, v in pairs(parameters.items) do
            if(v[1] ~= "storageset") then
                if(items ~= nil) then
                    items = items .. ", "
                else
                    items = ""
                end

                if(tonumber(v[1]) ~= nil and tonumber(v[1]) > 1) then
                    items = items .. v[1] .. " "
                end

                items = items .. v[3]
            end
        end

        module.npcHandler:say('Do you want ' .. keywords[1] .. ' ' .. (addon == 0 and "outfit" or "addon") .. ' for ' .. items .. '?', cid)
        return true

    end

    function OutfitModule.onConfirm(cid, message, keywords, parameters, node)
        local module = parameters.module
        if(not module.npcHandler:isFocused(cid)) then
            return false
        end

        local parent = node:getParent():getParameters()
        if(isPlayerPremiumCallback(cid) or not parent.premium) then
            if(not canPlayerWearOutfitId(cid, parent.outfit, parent.addon)) then
                if(parent.addon == 0 or canPlayerWearOutfitId(cid, parent.outfit)) then
                    if(parent.gender == nil or parent.gender == getPlayerSex(cid)) then
                        local found = true
                        for k, v in pairs(parent.items) do
                            local tmp = tonumber(v[1])
                            if(tmp == nil) then
                                if(v[1] == "storagecheck") then
                                    if(getCreatureStorage(cid, k) < v[2]) then
                                        found = false
                                    end
                                elseif(v[1] == "outfitid") then
                                    if(not canPlayerWearOutfitId(cid, k, v[2])) then
                                        found = false
                                    end
                                elseif(v[1] == "outfit") then
                                    if(not canPlayerWearOutfit(cid, k, v[2])) then
                                        found = false
                                    end
                                else
                                    found = false
                                end
                            elseif(k == 20000) then
                                if(getPlayerMoney(cid) < tmp) then
                                    found = false
                                end
                            elseif(getPlayerItemCount(cid, k, v[2]) < tmp) then
                                found = false
                            end

                            if(not found) then
                                break
                            end
                        end

                        if(found) then
                            for k, v in pairs(parent.items) do
                                if(tonumber(v[1]) ~= nil) then
                                    if(k == 20000) then
                                        doPlayerRemoveMoney(cid, v[1])
                                    else
                                        doPlayerRemoveItem(cid, k, v[1], v[2])
                                    end
                                elseif(v[1] == "storageset") then
                                    doCreatureSetStorage(cid, k, v[2])
                                end
                            end

                            module.npcHandler:say('It was a pleasure to dress you.', cid)
                            OUTFITMODULE_FUNCTION(cid, parent.outfit, parent.addon)
                            doPlayerSetStorageValue(cid, parent.storageId, storage)
                        else
                            module.npcHandler:say('You don\'t have these items!', cid)
                        end
                    else
                        module.npcHandler:say('Sorry, this ' .. (parent.addon == 0 and 'outfit' or 'addon') .. ' is not for your gender.', cid)
                    end
                else
                    module.npcHandler:say('I will not dress you with addon of outfit you cannot wear!', cid)
                end
            else
                module.npcHandler:say('You alrady have this ' .. (parent.addon == 0 and 'outfit' or 'addon') .. '!', cid)
            end
        else
            module.npcHandler:say('Sorry, I dress only premium players.', cid)
        end

        module.npcHandler:resetNpc()
        return true
    end

    -- onDecline keyword callback function. Generally called when the player sais 'no' after wanting to buy an item.
    function OutfitModule.onDecline(cid, message, keywords, parameters, node)
        local module = parameters.module
        if(not module.npcHandler:isFocused(cid)) then
            return false
        end

        module.npcHandler:say(module.npcHandler:parseMessage(module.npcHandler:getMessage(MESSAGE_DECLINE), {[TAG_PLAYERNAME] = getCreatureName(cid)}), cid)
        module.npcHandler:resetNpc()
        return true
    end

    function OutfitModule.listOutfits(cid, message, keywords, parameters, node)
        local module = parameters.module
        if(not module.npcHandler:isFocused(cid)) then
            return false
        end

        local msg = nil
        if(table.maxn(module.outfits) > 0) then
            for _, outfit in ipairs(module.outfits) do
                if(msg ~= nil) then
                    msg = msg .. ", "
                else
                    msg = "I can dress you into "
                end

                msg = msg .. "{" .. outfit .. "}"
            end
        else
            msg = "Sorry, I have nothing to offer right now."
        end

        module.npcHandler:say(msg .. ".", cid)
        module.npcHandler:resetNpc()
        return true
    end

    ShopModule = {
        npcHandler = nil,
        yesNode = nil,
        noNode = nil,
        noText = '',
        maxCount = 100,
        amount = 0
    }

    -- Add it to the parseable module list.
    Modules.parseableModules['module_shop'] = ShopModule

    -- Creates a new instance of ShopModule
    function ShopModule:new()
        local obj = {}
        setmetatable(obj, self)
        self.__index = self
        return obj
    end

    -- Parses all known parameters.
    function ShopModule:parseParameters()
        local ret = NpcSystem.getParameter('shop_buyable')
        if(ret ~= nil) then
            self:parseBuyable(ret)
        end

        local ret = NpcSystem.getParameter('shop_sellable')
        if(ret ~= nil) then
            self:parseSellable(ret)
        end

        local ret = NpcSystem.getParameter('shop_buyable_containers')
        if(ret ~= nil) then
            self:parseBuyableContainers(ret)
        end
    end

    -- Parse a string contaning a set of buyable items.
    function ShopModule:parseBuyable(data)
        for item in string.gmatch(data, '[^;]+') do
            local i = 1

            local name = nil
            local itemid = nil
            local cost = nil
            local subType = nil
            local realName = nil

            for temp in string.gmatch(item, '[^,]+') do
                if(i == 1) then
                    name = temp
                elseif(i == 2) then
                    itemid = tonumber(temp)
                elseif(i == 3) then
                    cost = tonumber(temp)
                elseif(i == 4) then
                    subType = tonumber(temp)
                elseif(i == 5) then
                    realName = temp
                else
                    print('[Warning] NpcSystem:', 'Unknown parameter found in buyable items parameter.', temp, item)
                end
                i = i + 1
            end

            if(SHOPMODULE_MODE == SHOPMODULE_MODE_TRADE) then
                if(itemid ~= nil and cost ~= nil) then
                    if((isItemRune(itemid) or isItemFluidContainer(itemid)) and subType == nil) then
                        print('[Warning] NpcSystem:', 'SubType missing for parameter item:', item)
                    else
                        self:addBuyableItem(nil, itemid, cost, subType, realName)
                    end
                else
                    print('[Warning] NpcSystem:', 'Parameter(s) missing for item:', itemid, cost)
                end
            else
                if(name ~= nil and itemid ~= nil and cost ~= nil) then
                    if((isItemRune(itemid) or isItemFluidContainer(itemid)) and subType == nil) then
                        print('[Warning] NpcSystem:', 'SubType missing for parameter item:', item)
                    else
                        local names = {}
                        table.insert(names, name)
                        self:addBuyableItem(names, itemid, cost, subType, realName)
                    end
                else
                    print('[Warning] NpcSystem:', 'Parameter(s) missing for item:', name, itemid, cost)
                end
            end
        end
    end

    -- Parse a string contaning a set of sellable items.
    function ShopModule:parseSellable(data)
        for item in string.gmatch(data, '[^;]+') do
            local i = 1

            local name = nil
            local itemid = nil
            local cost = nil
            local realName = nil

            for temp in string.gmatch(item, '[^,]+') do
                if(i == 1) then
                    name = temp
                elseif(i == 2) then
                    itemid = tonumber(temp)
                elseif(i == 3) then
                    cost = tonumber(temp)
                elseif(i == 4) then
                    realName = temp
                else
                    print('[Warning] NpcSystem:', 'Unknown parameter found in sellable items parameter.', temp, item)
                end
                i = i + 1
            end

            if(SHOPMODULE_MODE == SHOPMODULE_MODE_TRADE) then
                if(itemid ~= nil and cost ~= nil) then
                    self:addSellableItem(nil, itemid, cost, realName)
                else
                    print('[Warning] NpcSystem:', 'Parameter(s) missing for item:', itemid, cost)
                end
            else
                if(name ~= nil and itemid ~= nil and cost ~= nil) then
                    local names = {}
                    table.insert(names, name)
                    self:addSellableItem(names, itemid, cost, realName)
                else
                    print('[Warning] NpcSystem:', 'Parameter(s) missing for item:', name, itemid, cost)
                end
            end
        end
    end

    -- Parse a string contaning a set of buyable items.
    function ShopModule:parseBuyableContainers(data)
        for item in string.gmatch(data, '[^;]+') do
            local i = 1

            local name = nil
            local container = nil
            local itemid = nil
            local cost = nil
            local subType = nil
            local realName = nil

            for temp in string.gmatch(item, '[^,]+') do
                if(i == 1) then
                    name = temp
                elseif(i == 2) then
                    itemid = tonumber(temp)
                elseif(i == 3) then
                    itemid = tonumber(temp)
                elseif(i == 4) then
                    cost = tonumber(temp)
                elseif(i == 5) then
                    subType = tonumber(temp)
                elseif(i == 6) then
                    realName = temp
                else
                    print('[Warning] NpcSystem:', 'Unknown parameter found in buyable items parameter.', temp, item)
                end
                i = i + 1
            end

            if(name ~= nil and container ~= nil and itemid ~= nil and cost ~= nil) then
                if((isItemRune(itemid) or isItemFluidContainer(itemid)) and subType == nil) then
                    print('[Warning] NpcSystem:', 'SubType missing for parameter item:', item)
                else
                    local names = {}
                    table.insert(names, name)
                    self:addBuyableItemContainer(names, container, itemid, cost, subType, realName)
                end
            else
                print('[Warning] NpcSystem:', 'Parameter(s) missing for item:', name, container, itemid, cost)
            end
        end
    end

    -- Initializes the module and associates handler to it.
    function ShopModule:init(handler)
        self.npcHandler = handler
        self.yesNode = KeywordNode:new(SHOP_YESWORD, ShopModule.onConfirm, {module = self})
        self.noNode = KeywordNode:new(SHOP_NOWORD, ShopModule.onDecline, {module = self})

        self.noText = handler:getMessage(MESSAGE_DECLINE)
        if(SHOPMODULE_MODE ~= SHOPMODULE_MODE_TALK) then
            for i, word in pairs(SHOP_TRADEREQUEST) do
                local obj = {}
                table.insert(obj, word)

                obj.callback = SHOP_TRADEREQUEST.callback or ShopModule.messageMatcher
                handler.keywordHandler:addKeyword(obj, ShopModule.requestTrade, {module = self})
            end
        end
    end

    -- Custom message matching callback function for requesting trade messages.
    function ShopModule.messageMatcher(keywords, message)
        for i, word in pairs(keywords) do
            if(type(word) == 'string') then
                if string.find(message, word) and not string.find(message, '[%w+]' .. word) and not string.find(message, word .. '[%w+]') then
                    return true
                end
            end
        end

        return false
    end

    -- Resets the module-specific variables.
    function ShopModule:reset()
        self.amount = 0
    end

    -- Function used to match a number value from a string.
    function ShopModule:getCount(message)
        local ret = 1
        local b, e = string.find(message, PATTERN_COUNT)
        if b ~= nil and e ~= nil then
            ret = tonumber(string.sub(message, b, e))
        end

        if(ret <= 0) then
            ret = 1
        elseif(ret > self.maxCount) then
            ret = self.maxCount
        end

        return ret
    end

    -- Adds a new buyable item.
    --  names = A table containing one or more strings of alternative names to this item. Used only for old buy/sell system.
    --  itemid = The itemid of the buyable item
    --  cost = The price of one single item
    --  subType - The subType of each rune or fluidcontainer item. Can be left out if it is not a rune/fluidcontainer. Default value is 1.
    --  realName - The real, full name for the item. Will be used as ITEMNAME in MESSAGE_ONBUY and MESSAGE_ONSELL if defined. Default value is nil (getItemNameById will be used)
    function ShopModule:addBuyableItem(names, itemid, cost, subType, realName)
        if(SHOPMODULE_MODE ~= SHOPMODULE_MODE_TALK) then
            if(self.npcHandler.shopItems[itemid] == nil) then
                self.npcHandler.shopItems[itemid] = {buyPrice = -1, sellPrice = -1, subType = 1, realName = ""}
            end

            self.npcHandler.shopItems[itemid].buyPrice = cost
            self.npcHandler.shopItems[itemid].realName = realName or getItemNameById(itemid)
            self.npcHandler.shopItems[itemid].subType = subType or 1
        end

        if(names ~= nil and SHOPMODULE_MODE ~= SHOPMODULE_MODE_TRADE) then
            local parameters = {
                itemid = itemid,
                cost = cost,
                eventType = SHOPMODULE_BUY_ITEM,
                module = self,
                realName = realName or getItemNameById(itemid),
                subType = subType or 1
            }

            for i, name in pairs(names) do
                local keywords = {}
                table.insert(keywords, 'buy')
                table.insert(keywords, name)

                local node = self.npcHandler.keywordHandler:addKeyword(keywords, ShopModule.tradeItem, parameters)
                node:addChildKeywordNode(self.yesNode)
                node:addChildKeywordNode(self.noNode)
            end
        end
    end

    -- Adds a new buyable container of items.
    --  names = A table containing one or more strings of alternative names to this item.
    --  container = Backpack, bag or any other itemid of container where bought items will be stored
    --  itemid = The itemid of the buyable item
    --  cost = The price of one single item
    --  subType - The subType of each rune or fluidcontainer item. Can be left out if it is not a rune/fluidcontainer. Default value is 1.
    --  realName - The real, full name for the item. Will be used as ITEMNAME in MESSAGE_ONBUY and MESSAGE_ONSELL if defined. Default value is nil (getItemNameById will be used)
    function ShopModule:addBuyableItemContainer(names, container, itemid, cost, subType, realName)
        if(names ~= nil) then
            local parameters = {
                container = container,
                itemid = itemid,
                cost = cost,
                eventType = SHOPMODULE_BUY_ITEM_CONTAINER,
                module = self,
                realName = realName or getItemNameById(itemid),
                subType = subType or 1
            }

            for i, name in pairs(names) do
                local keywords = {}
                table.insert(keywords, 'buy')
                table.insert(keywords, name)

                local node = self.npcHandler.keywordHandler:addKeyword(keywords, ShopModule.tradeItem, parameters)
                node:addChildKeywordNode(self.yesNode)
                node:addChildKeywordNode(self.noNode)
            end
        end
    end

    -- Adds a new sellable item.
    --  names = A table containing one or more strings of alternative names to this item. Used only by old buy/sell system.
    --  itemid = The itemid of the sellable item
    --  cost = The price of one single item
    --  realName - The real, full name for the item. Will be used as ITEMNAME in MESSAGE_ONBUY and MESSAGE_ONSELL if defined. Default value is nil (getItemNameById will be used)
    function ShopModule:addSellableItem(names, itemid, cost, realName)
        if(SHOPMODULE_MODE ~= SHOPMODULE_MODE_TALK) then
            if(self.npcHandler.shopItems[itemid] == nil) then
                self.npcHandler.shopItems[itemid] = {buyPrice = -1, sellPrice = -1, subType = 1, realName = ""}
            end

            self.npcHandler.shopItems[itemid].sellPrice = cost
            self.npcHandler.shopItems[itemid].realName = realName or getItemNameById(itemid)
        end

        if(names ~= nil and SHOPMODULE_MODE ~= SHOPMODULE_MODE_TRADE) then
            local parameters = {
                itemid = itemid,
                cost = cost,
                eventType = SHOPMODULE_SELL_ITEM,
                module = self,
                realName = realName or getItemNameById(itemid)
            }

            for i, name in pairs(names) do
                local keywords = {}
                table.insert(keywords, 'sell')
                table.insert(keywords, name)

                local node = self.npcHandler.keywordHandler:addKeyword(keywords, ShopModule.tradeItem, parameters)
                node:addChildKeywordNode(self.yesNode)
                node:addChildKeywordNode(self.noNode)
            end
        end
    end

    -- onModuleReset callback function. Calls ShopModule:reset()
    function ShopModule:callbackOnModuleReset()
        self:reset()
        return true
    end

    -- Callback onBuy() function. If you wish, you can change certain Npc to use your onBuy().
    function ShopModule:callbackOnBuy(cid, itemid, subType, amount, ignoreCap, inBackpacks)
        if(self.npcHandler.shopItems[itemid] == nil) then
            error("[ShopModule.onBuy]", "items[itemid] == nil")
            return false
        end

        if(self.npcHandler.shopItems[itemid].buyPrice == -1) then
            error("[ShopModule.onSell]", "Attempt to buy a non-buyable item")
            return false
        end

        local backpack = 1988
        local totalCost = amount * self.npcHandler.shopItems[itemid].buyPrice
        if(inBackpacks) then
            totalCost = totalCost + (math.max(1, math.floor(amount / getContainerCapById(backpack))) * 20)
        end

        local parseInfo = {
            [TAG_PLAYERNAME] = getPlayerName(cid),
            [TAG_ITEMCOUNT] = amount,
            [TAG_TOTALCOST] = totalCost,
            [TAG_ITEMNAME] = self.npcHandler.shopItems[itemid].realName
        }

        if(getPlayerMoney(cid) < totalCost) then
            local msg = self.npcHandler:getMessage(MESSAGE_NEEDMONEY)
            msg = self.npcHandler:parseMessage(msg, parseInfo)
            doPlayerSendCancel(cid, msg)
            return false
        end

        local subType = self.npcHandler.shopItems[itemid].subType or 1
        local a, b = doNpcSellItem(cid, itemid, amount, subType, ignoreCap, inBackpacks, backpack)
        if(a < amount) then
            local msgId = MESSAGE_NEEDMORESPACE
            if(a == 0) then
                msgId = MESSAGE_NEEDSPACE
            end

            local msg = self.npcHandler:getMessage(msgId)
            parseInfo[TAG_ITEMCOUNT] = a
            msg = self.npcHandler:parseMessage(msg, parseInfo)
            doPlayerSendCancel(cid, msg)
            if(NPCHANDLER_CONVBEHAVIOR ~= CONVERSATION_DEFAULT) then
                self.npcHandler.talkStart[cid] = os.time()
            else
                self.npcHandler.talkStart = os.time()
            end

            if(a > 0) then
                doPlayerRemoveMoney(cid, ((a * self.npcHandler.shopItems[itemid].buyPrice) + (b * 20)))
                return true
            end

            return false
        else
            local msg = self.npcHandler:getMessage(MESSAGE_BOUGHT)
            msg = self.npcHandler:parseMessage(msg, parseInfo)
            doPlayerSendTextMessage(cid, MESSAGE_INFO_DESCR, msg)
            doPlayerRemoveMoney(cid, totalCost)
            if(NPCHANDLER_CONVBEHAVIOR ~= CONVERSATION_DEFAULT) then
                self.npcHandler.talkStart[cid] = os.time()
            else
                self.npcHandler.talkStart = os.time()
            end

            return true
        end
    end

    -- Callback onSell() function. If you wish, you can change certain Npc to use your onSell().
    function ShopModule:callbackOnSell(cid, itemid, subType, amount, ignoreCap, inBackpacks)
        if(self.npcHandler.shopItems[itemid] == nil) then
            error("[ShopModule.onSell]", "items[itemid] == nil")
            return false
        end

        if(self.npcHandler.shopItems[itemid].sellPrice == -1) then
            error("[ShopModule.onSell]", "Attempt to sell a non-sellable item")
            return false
        end

        local parseInfo = {
            [TAG_PLAYERNAME] = getPlayerName(cid),
            [TAG_ITEMCOUNT] = amount,
            [TAG_TOTALCOST] = amount * self.npcHandler.shopItems[itemid].sellPrice,
            [TAG_ITEMNAME] = self.npcHandler.shopItems[itemid].realName
        }

        if(subType < 1 or getItemInfo(itemid).stackable) then
            subType = -1
        end

        if(doPlayerRemoveItem(cid, itemid, amount, subType)) then
            local msg = self.npcHandler:getMessage(MESSAGE_SOLD)
            msg = self.npcHandler:parseMessage(msg, parseInfo)
            doPlayerSendTextMessage(cid, MESSAGE_INFO_DESCR, msg)
            doPlayerAddMoney(cid, amount * self.npcHandler.shopItems[itemid].sellPrice)
            if(NPCHANDLER_CONVBEHAVIOR ~= CONVERSATION_DEFAULT) then
                self.npcHandler.talkStart[cid] = os.time()
            else
                self.npcHandler.talkStart = os.time()
            end
            return true
        else
            local msg = self.npcHandler:getMessage(MESSAGE_NEEDITEM)
            msg = self.npcHandler:parseMessage(msg, parseInfo)
            doPlayerSendCancel(cid, msg)
            if(NPCHANDLER_CONVBEHAVIOR ~= CONVERSATION_DEFAULT) then
                self.npcHandler.talkStart[cid] = os.time()
            else
                self.npcHandler.talkStart = os.time()
            end
            return false
        end
    end

    -- Callback for requesting a trade window with the NPC.
    function ShopModule.requestTrade(cid, message, keywords, parameters, node)
        local module = parameters.module
        if(not module.npcHandler:isFocused(cid)) then
            return false
        end

        local itemWindow = {}
        for itemid, attr in pairs(module.npcHandler.shopItems) do
            local item = {id = itemid, buy = attr.buyPrice, sell = attr.sellPrice, subType = attr.subType, name = attr.realName}
            table.insert(itemWindow, item)
        end

        if(itemWindow[1] == nil) then
            local parseInfo = { [TAG_PLAYERNAME] = getPlayerName(cid) }
            local msg = module.npcHandler:parseMessage(module.npcHandler:getMessage(MESSAGE_NOSHOP), parseInfo)
            module.npcHandler:say(msg, cid)
            return true
        end

        local parseInfo = { [TAG_PLAYERNAME] = getPlayerName(cid) }
        local msg = module.npcHandler:parseMessage(module.npcHandler:getMessage(MESSAGE_SENDTRADE), parseInfo)
        openShopWindow(cid, itemWindow,
            function(cid, itemid, subType, amount, ignoreCap, inBackpacks) module.npcHandler:onBuy(cid, itemid, subType, amount, ignoreCap, inBackpacks) end,
            function(cid, itemid, subType, amount, ignoreCap, inBackpacks) module.npcHandler:onSell(cid, itemid, subType, amount, ignoreCap, inBackpacks) end)
        module.npcHandler:say(msg, cid)
        return true
    end

    -- onConfirm keyword callback function. Sells/buys the actual item.
    function ShopModule.onConfirm(cid, message, keywords, parameters, node)
        local module = parameters.module
        if(not module.npcHandler:isFocused(cid)) then
            return false
        end

        local parentParameters = node:getParent():getParameters()
        local parseInfo = {
            [TAG_PLAYERNAME] = getPlayerName(cid),
            [TAG_ITEMCOUNT] = module.amount,
            [TAG_TOTALCOST] = parentParameters.cost * module.amount,
            [TAG_ITEMNAME] = parentParameters.realName
        }

        if(parentParameters.eventType == SHOPMODULE_SELL_ITEM) then
            local ret = doPlayerSellItem(cid, parentParameters.itemid, module.amount, parentParameters.cost * module.amount)
            if(ret) then
                local msg = module.npcHandler:getMessage(MESSAGE_ONSELL)
                msg = module.npcHandler:parseMessage(msg, parseInfo)
                module.npcHandler:say(msg, cid)
            else
                local msg = module.npcHandler:getMessage(MESSAGE_MISSINGITEM)
                msg = module.npcHandler:parseMessage(msg, parseInfo)
                module.npcHandler:say(msg, cid)
            end
        elseif(parentParameters.eventType == SHOPMODULE_BUY_ITEM) then
            local ret = doPlayerBuyItem(cid, parentParameters.itemid, module.amount, parentParameters.cost * module.amount, parentParameters.subType)
            if(ret) then
                if parentParameters.itemid == ITEM_PARCEL then
                    doPlayerBuyItem(cid, ITEM_LABEL, module.amount, 0, parentParameters.subType)
                end
                local msg = module.npcHandler:getMessage(MESSAGE_ONBUY)
                msg = module.npcHandler:parseMessage(msg, parseInfo)
                module.npcHandler:say(msg, cid)
            else
                local msg = module.npcHandler:getMessage(MESSAGE_MISSINGMONEY)
                msg = module.npcHandler:parseMessage(msg, parseInfo)
                module.npcHandler:say(msg, cid)
            end
        elseif(parentParameters.eventType == SHOPMODULE_BUY_ITEM_CONTAINER) then
            local ret = doPlayerBuyItemContainer(cid, parentParameters.container, parentParameters.itemid, module.amount, parentParameters.cost * module.amount, parentParameters.subType)
            if(ret) then
                local msg = module.npcHandler:getMessage(MESSAGE_ONBUY)
                msg = module.npcHandler:parseMessage(msg, parseInfo)
                module.npcHandler:say(msg, cid)
            else
                local msg = module.npcHandler:getMessage(MESSAGE_MISSINGMONEY)
                msg = module.npcHandler:parseMessage(msg, parseInfo)
                module.npcHandler:say(msg, cid)
            end
        end

        module.npcHandler:resetNpc()
        return true
    end

    -- onDecliune keyword callback function. Generally called when the player sais 'no' after wanting to buy an item.
    function ShopModule.onDecline(cid, message, keywords, parameters, node)
        local module = parameters.module
        if(not module.npcHandler:isFocused(cid)) then
            return false
        end

        local parentParameters = node:getParent():getParameters()
        local parseInfo = {
            [TAG_PLAYERNAME] = getPlayerName(cid),
            [TAG_ITEMCOUNT] = module.amount,
            [TAG_TOTALCOST] = parentParameters.cost * module.amount,
            [TAG_ITEMNAME] = parentParameters.realName
        }

        local msg = module.npcHandler:parseMessage(module.noText, parseInfo)
        module.npcHandler:say(msg, cid)
        module.npcHandler:resetNpc()
        return true
    end

    -- tradeItem callback function. Makes the npc say the message defined by MESSAGE_BUY or MESSAGE_SELL
    function ShopModule.tradeItem(cid, message, keywords, parameters, node)
        local module = parameters.module
        if(not module.npcHandler:isFocused(cid)) then
            return false
        end

        local count = module:getCount(message)
        module.amount = count
        local parseInfo = {
            [TAG_PLAYERNAME] = getPlayerName(cid),
            [TAG_ITEMCOUNT] = module.amount,
            [TAG_TOTALCOST] = parameters.cost * module.amount,
            [TAG_ITEMNAME] = parameters.realName
        }

        if(parameters.eventType == SHOPMODULE_SELL_ITEM) then
            local msg = module.npcHandler:getMessage(MESSAGE_SELL)
            msg = module.npcHandler:parseMessage(msg, parseInfo)
            module.npcHandler:say(msg, cid)
        elseif(parameters.eventType == SHOPMODULE_BUY_ITEM) then
            local msg = module.npcHandler:getMessage(MESSAGE_BUY)
            msg = module.npcHandler:parseMessage(msg, parseInfo)
            module.npcHandler:say(msg, cid)
        elseif(parameters.eventType == SHOPMODULE_BUY_ITEM_CONTAINER) then
            local msg = module.npcHandler:getMessage(MESSAGE_BUY)
            msg = module.npcHandler:parseMessage(msg, parseInfo)
            module.npcHandler:say(msg, cid)
        end

        return true
    end
end