Boa tarde pessoal,

Estou a um bom tempo tentando fazer um cod funcionar e não consigo e é extremamente simples kkkk.
Se alguém com conhecimento em programação puder me ajuda ganha em REP+.

Eu preciso que esta parte do cod

if (getPlayerTown(cid) ~= CITYID) then
doPlayerSetTown(cid, CITYID)
doTeleportThing(cid, getTownTemplePosition(getPlayerTown(cid)))

Fique dentro do Escolha 1 (Yes) deste script de NPC.

local keywordHandler = KeywordHandler:new()
local npcHandler = NpcHandler:new(keywordHandler)
NpcSystem.parseParameters(npcHandler)
local talkState = {} 

function onCreatureAppear(cid) npcHandler:onCreatureAppear(cid) end 
function onCreatureDisappear(cid) npcHandler:onCreatureDisappear(cid) end 
function onCreatureSay(cid, type, msg) npcHandler:onCreatureSay(cid, type, msg) end 
function onThink() npcHandler:onThink() end 

function creatureSayCallback(cid, type, msg) 
if (not npcHandler:isFocused(cid)) then 
return false 
end
 
local CITYID = 3 -- Townid da cidade!
local CITYNAME = "castle king" -- Nome da Cidade!

local 	node1 = keywordHandler:addKeyword({'promot'}, StdModule.say, {npcHandler = npcHandler, onlyFocus = true, text = 'I can promote you for 20000 gold coins. Do you want me to promote you?'})
		node1:addChildKeyword({'yes'}, StdModule.promotePlayer, {npcHandler = npcHandler, cost = 0, level = 200, promotion = 1, text = 'Congratulations! You are now promoted.'})
		node1:addChildKeyword({'no'}, StdModule.say, {npcHandler = npcHandler, onlyFocus = true, text = 'Alright then, come back when you are ready.', reset = true})
return 0
end
end

npcHandler:setCallback(CALLBACK_MESSAGE_DEFAULT, creatureSayCallback) 
npcHandler:addModule(FocusModule:new())

Este script vai trocar o ID Town  do jogador e teleporta ele para o nova ID Town

Obrigado
 

Não sei se vai funcionar sou bem iniciante ainda (tipo muito) mas... tenta:

 

local keywordHandler = KeywordHandler:new()
local npcHandler = NpcHandler:new(keywordHandler)
NpcSystem.parseParameters(npcHandler)
local talkState = {} 

function onCreatureAppear(cid) npcHandler:onCreatureAppear(cid) end 
function onCreatureDisappear(cid) npcHandler:onCreatureDisappear(cid) end 
function onCreatureSay(cid, type, msg) npcHandler:onCreatureSay(cid, type, msg) end 
function onThink() npcHandler:onThink() end 

function creatureSayCallback(cid, type, msg) 
if (not npcHandler:isFocused(cid)) then 
return false 
end
 
local CITYID = 3 -- Townid da cidade!
local CITYNAME = "castle king" -- Nome da Cidade!

local 	node1 = keywordHandler:addKeyword({'promot'}, StdModule.say, {npcHandler = npcHandler, onlyFocus = true, text = 'I can promote you for 20000 gold coins. Do you want me to promote you?'})
		node1:addChildKeyword({'yes'}, StdModule.promotePlayer, {npcHandler = npcHandler, cost = 0, level = 200, promotion = 1, text = 'Congratulations! You are now promoted.'})
		node1:addChildKeyword({'no'}, StdModule.say, {npcHandler = npcHandler, onlyFocus = true, text = 'Alright then, come back when you are ready.', reset = true})
return 0
if (getPlayerTown(cid) ~= CITYID) then
doPlayerSetTown(cid, CITYID)
doTeleportThing(cid, getTownTemplePosition(getPlayerTown(cid)))
end   
end
end


npcHandler:setCallback(CALLBACK_MESSAGE_DEFAULT, creatureSayCallback) 
npcHandler:addModule(FocusModule:new())   

 

LucasAyres
Infelizmente isso não da certo, pq se a pessoa falar "no" ele tbm executa e função, precisa colocar dentro do escolha caso, ali no caso Node1 (YES).

já tentei varias vezes mas da erro com isso aqui ")", acredito que eu não esteja sabendo colocar o cod dentro.

Uma opção seria reescrever o código. Infelizmente, a preguiça não deixa.

Troque:

node1:addChildKeyword({'yes'}, StdModule.promotePlayer, {npcHandler = npcHandler, cost = 0, level = 200, promotion = 1, text = 'Congratulations! You are now promoted.'})

por:

node1:addChildKeyword({'yes'}, StdModule.promotePlayer, {npcHandler = npcHandler, new_hometown = CITYID, cost = 0, level = 200, promotion = 1, text = 'Congratulations! You are now promoted.'})

Depois, em npc/lib/npcsystem/modules.lua, acima de:

setPlayerPromotionLevel(cid, parameters.promotion)
npcHandler:say(parameters.text, cid)

coloque:

if parameters.new_hometown then
    doPlayerSetTown(cid, parameters.new_hometown)
    doTeleportThing(cid, getTownTemplePosition(parameters.new_hometown))
end

 

zipter98

Não tem este comando no meu modules.

setPlayerPromotionLevel(cid, parameters.promotion)
npcHandler:say(parameters.text, cid)

Vou colocar todo o meu MODULES AQUI em baixo.

-- Advanced NPC System by Jiddo

if Modules == nil then
	-- default words for greeting and ungreeting the npc. Should be a table containing all such words.
	FOCUS_GREETWORDS = {"hi", "hello"}
	FOCUS_FAREWELLWORDS = {"bye", "farewell"}

	-- The words for requesting trade window.
	SHOP_TRADEREQUEST = {"trade"}

	-- The word for accepting/declining an offer. CAN ONLY CONTAIN ONE FIELD! Should be a table with a single string value.
	SHOP_YESWORD = {"yes"}
	SHOP_NOWORD = {"no"}

	-- Pattern used to get the amount of an item a player wants to buy/sell.
	PATTERN_COUNT = "%d+"

	-- 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 client version 8.2: sell/buy item name
	SHOPMODULE_MODE_TRADE = 2 -- Trade window system introduced in client version 8.2
	SHOPMODULE_MODE_BOTH = 3 -- Both working at one time

	-- Used shop mode
	SHOPMODULE_MODE = SHOPMODULE_MODE_BOTH

	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

		if parameters.onlyFocus == true and parameters.onlyUnfocus == true then
			error("StdModule.say conflicting parameters 'onlyFocus' and 'onlyUnfocus' both true")
		end

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

		if npcHandler:isFocused(cid) and parameters.onlyUnfocus == true then
			return false
		end

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

		return true
	end

	--Usage:
		-- local node1 = keywordHandler:addKeyword({"promot"}, StdModule.say, {npcHandler = npcHandler, text = "I can promote you for 20000 gold coins. Do you want me to promote you?"})
		-- 		node1:addChildKeyword({"yes"}, StdModule.promotePlayer, {npcHandler = npcHandler, cost = 20000, level = 20}, text = "Congratulations! You are now promoted.")
		-- 		node1:addChildKeyword({"no"}, StdModule.say, {npcHandler = npcHandler, text = "Allright 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

		local player = Player(cid)
			if player:getStorageValue(Storage.Promotion) == 1 then
				npcHandler:say("You are already promoted!", cid)
			elseif player:getLevel() < parameters.level then
				npcHandler:say("I am sorry, but I can only promote you once you have reached level " .. parameters.level .. ".", cid)
			elseif not player:removeMoney(parameters.cost) then
				npcHandler:say("You do not have enough money!", cid)
			else
				local promotion = player:getVocation():getPromotion()
				player:setVocation(Vocation(promotion and promotion:getId() or 0))
				npcHandler:say(parameters.text, cid)
			end
		npcHandler:resetNpc(cid)
		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

		local player = Player(cid)
		if parameters.premium and player:isPremium() then
			if player:hasLearnedSpell(parameters.spellName) then
				npcHandler:say("You already know this spell.", cid)
			elseif player:getLevel() < 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 player:getVocation():getId() ~= parameters.vocation and player:getVocation():getId() ~= parameters.vocation + 4 and vocation ~= 9 then
				npcHandler:say("This spell is not for your vocation", cid)
			elseif not player:removeMoney(parameters.price) then
				npcHandler:say("You do not have enough money, this spell costs " .. parameters.price .. " gold.", cid)
			else
				npcHandler:say("You have learned " .. parameters.spellName .. ".", cid)
				player:learnSpell(parameters.spellName)
			end
		else
			npcHandler:say("You need a premium account in order to buy " .. parameters.spellName .. ".", cid)
		end

		npcHandler:resetNpc(cid)
		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

		local player = Player(cid)
		if parameters.premium and player:isPremium() then
			if player:hasBlessing(parameters.bless) then
				npcHandler:say("Gods have already blessed you with this blessing!", cid)
			elseif not player:removeMoney(parameters.cost) 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)
				player:addBlessing(parameters.bless)
			end
		else
			npcHandler:say("You need a premium account in order to be blessed.", cid)
		end

		npcHandler:resetNpc(cid)
		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 player = Player(cid)
		if parameters.premium and not player:isPremium() then
			npcHandler:say("I'm sorry, but you need a premium account in order to travel onboard our ships.", cid)
		elseif not player:removeMoney(parameters.cost) then
			npcHandler:say("You don't have enough money.", cid)
		elseif parameters.level ~= nil and player:getLevel() < parameters.level then
			npcHandler:say("You must reach level " .. parameters.level .. " before I can let you go there.", cid)
		elseif player:isPzLocked() then
			npcHandler:say("First get rid of those blood stains! You are not going to ruin my vehicle!", cid)
		else
			npcHandler:releaseFocus(cid)
			npcHandler:say(parameters.msg or "Set the sails!", cid)
			player:getPosition():sendMagicEffect(CONST_ME_TELEPORT)
			player:teleportTo(parameters.destination)
			Position(parameters.destination):sendMagicEffect(CONST_ME_TELEPORT)
		end

		npcHandler:resetNpc(cid)
		return true
	end

	FocusModule = {
		npcHandler = nil,
		greetWords = nil,
		farewellWords = nil,
		greetCallback = nil,
		farewellCallback = 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

		local greetWords = self.greetWords or FOCUS_GREETWORDS
		for i, word in pairs(greetWords) do
			local obj = {}
			obj[#obj + 1] = word
			obj.callback = self.greetCallback or FocusModule.messageMatcherDefault
			handler.keywordHandler:addKeyword(obj, FocusModule.onGreet, {module = self})
		end

		local farewellWords = self.farewellWords or FOCUS_FAREWELLWORDS
		for i, word in pairs(farewellWords) do
			local obj = {}
			obj[#obj + 1] = word
			obj.callback = self.farewellCallback or FocusModule.messageMatcherDefault
			handler.keywordHandler:addKeyword(obj, FocusModule.onFarewell, {module = self})
		end

		return true
	end

	-- Set custom greeting messages
	function FocusModule:addGreetMessage(message)
		if not self.greetWords then
			self.greetWords = {}
		end


		if type(message) == 'string' then
			table.insert(self.greetWords, message)
		else
			for i = 1, #message do
				table.insert(self.greetWords, message[i])
			end
		end
	end

	-- Set custom farewell messages
	function FocusModule:addFarewellMessage(message)
		if not self.farewellWords then
			self.farewellWords = {}
		end

		if type(message) == 'string' then
			table.insert(self.farewellWords, message)
		else
			for i = 1, #message do
				table.insert(self.farewellWords, message[i])
			end
		end
	end

	-- Set custom greeting callback
	function FocusModule:setGreetCallback(callback)
		self.greetCallback = callback
	end

	-- Set custom farewell callback
	function FocusModule:setFarewellCallback(callback)
		self.farewellCallback = callback
	end

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

	-- UnGreeting callback function.
	function FocusModule.onFarewell(cid, message, keywords, parameters)
		if parameters.module.npcHandler:isFocused(cid) then
			parameters.module.npcHandler:onFarewell(cid)
			return true
		else
			return false
		end
	end

	-- Custom message matching callback function for greeting messages.
	function FocusModule.messageMatcherDefault(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

	function FocusModule.messageMatcherStart(keywords, message)
		for i, word in pairs(keywords) do
			if type(word) == "string" then
				if string.starts(message, word) then
					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
		return true
	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
				keywords[#keywords + 1] = 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 : " .. Npc():getName() .. "] NpcSystem:", "Parameter '" .. "keyword_reply" .. n .. "' missing. Skipping...")
				end
			else
				print("[Warning : " .. Npc():getName() .. "] 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 = {}
		return true
	end

	-- Parses all known parameters.
	function TravelModule:parseParameters()
		local ret = NpcSystem.getParameter("travel_destinations")
		if ret ~= nil then
			self:parseDestinations(ret)

			self.npcHandler.keywordHandler:addKeyword({"destination"}, TravelModule.listDestinations, {module = self})
			self.npcHandler.keywordHandler:addKeyword({"where"}, TravelModule.listDestinations, {module = self})
			self.npcHandler.keywordHandler:addKeyword({"travel"}, TravelModule.listDestinations, {module = self})

		end
	end

	function TravelModule:parseDestinations(data)
		for destination in string.gmatch(data, "[^;]+") do
			local i = 1

			local name = nil
			local x = nil
			local y = nil
			local z = nil
			local cost = nil
			local premium = false

			for temp in string.gmatch(destination, "[^,]+") do
				if i == 1 then
					name = temp
				elseif i == 2 then
					x = tonumber(temp)
				elseif i == 3 then
					y = tonumber(temp)
				elseif i == 4 then
					z = tonumber(temp)
				elseif i == 5 then
					cost = tonumber(temp)
				elseif i == 6 then
					premium = temp == "true"
				else
					print("[Warning : " .. Npc():getName() .. "] NpcSystem:", "Unknown parameter found in travel destination parameter.", temp, destination)
				end
				i = i + 1
			end

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

	function TravelModule:addDestination(name, position, price, premium)
		self.destinations[#self.destinations + 1] = name

		local parameters = {
			cost = price,
			destination = position,
			premium = premium,
			module = self
		}
		local keywords = {}
		keywords[#keywords + 1] = name

		local keywords2 = {}
		keywords2[#keywords2 + 1] = "bring me to " .. name
		local node = self.npcHandler.keywordHandler:addKeyword(keywords, TravelModule.travel, parameters)
		self.npcHandler.keywordHandler:addKeyword(keywords2, TravelModule.bringMeTo, parameters)
		node:addChildKeywordNode(self.yesNode)
		node:addChildKeywordNode(self.noNode)

		if npcs_loaded_travel[getNpcCid()] == nil then
			npcs_loaded_travel[getNpcCid()] = getNpcCid()
			self.npcHandler.keywordHandler:addKeyword({'yes'}, TravelModule.onConfirm, {module = self})
			self.npcHandler.keywordHandler:addKeyword({'no'}, TravelModule.onDecline, {module = self})
		end
	end

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

		local npcHandler = module.npcHandler

		shop_destination[cid] = parameters.destination
		shop_cost[cid] = parameters.cost
		shop_premium[cid] = parameters.premium
		shop_npcuid[cid] = getNpcCid()

		local cost = parameters.cost
		local destination = parameters.destination
		local premium = parameters.premium

		module.npcHandler:say("Do you want to travel to " .. keywords[1] .. " for " .. 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

		if shop_npcuid[cid] ~= getNpcCid() then
			return false
		end

		local npcHandler = module.npcHandler

		local parentParameters = node:getParent():getParameters()
		local cost = shop_cost[cid]
		local destination = shop_destination[cid]
		local premium = shop_premium[cid]

		local player = Player(cid)
		if not isPlayerPremiumCallback or isPlayerPremiumCallback(player) or shop_premium[cid] ~= true then
			if player:removeMoney(cost) ~= TRUE then
				npcHandler:say("You do not have enough money!", cid)
			elseif player:isPzLocked() then
				npcHandler:say("Get out of there with this blood.", cid)
			else
				npcHandler:say("It was a pleasure doing business with you.", cid)
				npcHandler:releaseFocus(cid)
				-- Todo convert all destionation parameters to Position(x, y, z) instead of lua tables
				player:teleportTo(destination)
				Position(destination):sendMagicEffect(CONST_ME_TELEPORT)
			end
		else
			npcHandler:say("I can only allow premium players to travel there.", cid)
		end

		npcHandler:resetNpc(cid)
		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) or shop_npcuid[cid] ~= getNpcCid() then
			return false
		end
		local parentParameters = node:getParent():getParameters()
		local parseInfo = { [TAG_PLAYERNAME] = Player(cid):getName() }
		local msg = module.npcHandler:parseMessage(module.npcHandler:getMessage(MESSAGE_DECLINE), parseInfo)
		module.npcHandler:say(msg, cid)
		module.npcHandler:resetNpc(cid)
		return true
	end

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

		local cost = parameters.cost
		local destination = parameters.destination
		local premium = parameters.premium

		if(not isPlayerPremiumCallback or isPlayerPremiumCallback(cid) or parameters.premium ~= true) then
			local player = Player(cid)
			if player:removeMoney(cost) then
				player:teleportTo(destination)
				Position(destination):sendMagicEffect(CONST_ME_TELEPORT)
			end
		end
		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 = "I can bring you to "
		--local i = 1
		local maxn = #module.destinations
		for i, destination in pairs(module.destinations) do
			msg = msg .. destination
			if i == maxn - 1 then
				msg = msg .. " and "
			elseif i == maxn then
				msg = msg .. "."
			else
				msg = msg .. ", "
			end
			i = i + 1
		end

		module.npcHandler:say(msg, cid)
		module.npcHandler:resetNpc(cid)
		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 : " .. Npc():getName() .. "] 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 subType == nil and ItemType(itemid):isFluidContainer() then
						print("[Warning : " .. Npc():getName() .. "] NpcSystem:", "SubType missing for parameter item:", item)
					else
						self:addBuyableItem(nil, itemid, cost, subType, realName)
					end
				else
					print("[Warning : " .. Npc():getName() .. "] NpcSystem:", "Parameter(s) missing for item:", itemid, cost)
				end
			else
				if name ~= nil and itemid ~= nil and cost ~= nil then
					if subType == nil and ItemType(itemid):isFluidContainer() then
						print("[Warning : " .. Npc():getName() .. "] NpcSystem:", "SubType missing for parameter item:", item)
					else
						local names = {}
						names[#names + 1] = name
						self:addBuyableItem(names, itemid, cost, subType, realName)
					end
				else
					print("[Warning : " .. Npc():getName() .. "] 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
			local subType = 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
				elseif i == 5 then
					subType = tonumber(temp)
				else
					print("[Warning : " .. Npc():getName() .. "] 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, subType)
				else
					print("[Warning : " .. Npc():getName() .. "] NpcSystem:", "Parameter(s) missing for item:", itemid, cost)
				end
			else
				if name ~= nil and itemid ~= nil and cost ~= nil then
					local names = {}
					names[#names + 1] = name
					self:addSellableItem(names, itemid, cost, realName, subType)
				else
					print("[Warning : " .. Npc():getName() .. "] 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 : " .. Npc():getName() .. "] 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 subType == nil and ItemType(itemid):isFluidContainer() then
					print("[Warning : " .. Npc():getName() .. "] NpcSystem:", "SubType missing for parameter item:", item)
				else
					local names = {}
					names[#names + 1] = name
					self:addBuyableItemContainer(names, container, itemid, cost, subType, realName)
				end
			else
				print("[Warning : " .. Npc():getName() .. "] 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 = {}
				obj[#obj + 1] = word
				obj.callback = SHOP_TRADEREQUEST.callback or ShopModule.messageMatcher
				handler.keywordHandler:addKeyword(obj, ShopModule.requestTrade, {module = self})
			end
		end

		return true
	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 (getName will be used)
	function ShopModule:addBuyableItem(names, itemid, cost, itemSubType, realName)
		if SHOPMODULE_MODE ~= SHOPMODULE_MODE_TALK then
			if itemSubType == nil then
				itemSubType = 1
			end

			local shopItem = self:getShopItem(itemid, itemSubType)
			if shopItem == nil then
				self.npcHandler.shopItems[#self.npcHandler.shopItems + 1] = {id = itemid, buy = cost, sell = -1, subType = itemSubType, name = realName or ItemType(itemid):getName()}
			else
				shopItem.buy = cost
			end
		end

		if names ~= nil and SHOPMODULE_MODE ~= SHOPMODULE_MODE_TRADE then
			for i, name in pairs(names) do
				local parameters = {
						itemid = itemid,
						cost = cost,
						eventType = SHOPMODULE_BUY_ITEM,
						module = self,
						realName = realName or ItemType(itemid):getName(),
						subType = itemSubType or 1
					}

				keywords = {}
				keywords[#keywords + 1] = "buy"
				keywords[#keywords + 1] = name
				local node = self.npcHandler.keywordHandler:addKeyword(keywords, ShopModule.tradeItem, parameters)
				node:addChildKeywordNode(self.yesNode)
				node:addChildKeywordNode(self.noNode)
			end
		end

		if npcs_loaded_shop[getNpcCid()] == nil then
			npcs_loaded_shop[getNpcCid()] = getNpcCid()
			self.npcHandler.keywordHandler:addKeyword({'yes'}, ShopModule.onConfirm, {module = self})
			self.npcHandler.keywordHandler:addKeyword({'no'}, ShopModule.onDecline, {module = self})
		end
	end

	function ShopModule:getShopItem(itemId, itemSubType)
		if ItemType(itemId):isFluidContainer() then
			for i = 1, #self.npcHandler.shopItems do
				local shopItem = self.npcHandler.shopItems[i]
				if shopItem.id == itemId and shopItem.subType == itemSubType then
					return shopItem
				end
			end
		else
			for i = 1, #self.npcHandler.shopItems do
				local shopItem = self.npcHandler.shopItems[i]
				if shopItem.id == itemId then
					return shopItem
				end
			end
		end
		return nil
	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 (getName will be used)
	function ShopModule:addBuyableItemContainer(names, container, itemid, cost, subType, realName)
		if names ~= nil then
			for i, name in pairs(names) do
				local parameters = {
						container = container,
						itemid = itemid,
						cost = cost,
						eventType = SHOPMODULE_BUY_ITEM_CONTAINER,
						module = self,
						realName = realName or ItemType(itemid):getName(),
						subType = subType or 1
					}

				keywords = {}
				keywords[#keywords + 1] = "buy"
				keywords[#keywords + 1] = 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 (getName will be used)
	function ShopModule:addSellableItem(names, itemid, cost, realName, itemSubType)
		if SHOPMODULE_MODE ~= SHOPMODULE_MODE_TALK then
			if itemSubType == nil then
				itemSubType = 0
			end

			local shopItem = self:getShopItem(itemid, itemSubType)
			if shopItem == nil then
				table.insert(self.npcHandler.shopItems, {id = itemid, buy = -1, sell = cost, subType = itemSubType, name = realName or ItemType(itemid):getName()})
			else
				shopItem.sell = cost
			end
		end

		if(names ~= nil and SHOPMODULE_MODE ~= SHOPMODULE_MODE_TRADE) then
			for i, name in pairs(names) do
				local parameters = {
					itemid = itemid,
					cost = cost,
					eventType = SHOPMODULE_SELL_ITEM,
					module = self,
					realName = realName or ItemType(itemid):getName()
				}

				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)
		local shopItem = self:getShopItem(itemid, subType)
		if shopItem == nil then
			error("[ShopModule.onBuy] shopItem == nil")
			return false
		end

		if shopItem.buy == -1 then
			error("[ShopModule.onSell] attempt to buy a non-buyable item")
			return false
		end

		local backpack = 1988
		local totalCost = amount * shopItem.buy
		if inBackpacks then
			totalCost = ItemType(itemid):isStackable() and totalCost + 20 or totalCost + (math.max(1, math.floor(amount / ItemType(backpack):getCapacity())) * 20)
		end

		local player = Player(cid)
		local parseInfo = {
			[TAG_PLAYERNAME] = player:getName(),
			[TAG_ITEMCOUNT] = amount,
			[TAG_TOTALCOST] = totalCost,
			[TAG_ITEMNAME] = shopItem.name
		}

		if player:getMoney() < totalCost then
			local msg = self.npcHandler:getMessage(MESSAGE_NEEDMONEY)
			msg = self.npcHandler:parseMessage(msg, parseInfo)
			player:sendCancelMessage(msg)
			return false
		end

		local subType = shopItem.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)
			player:sendCancelMessage(msg)
			self.npcHandler.talkStart[cid] = os.time()

			if(a > 0) then
				player:removeMoney((a * shopItem.buy) + (b * 20))
				return true
			end

			return false
		else
			local msg = self.npcHandler:getMessage(MESSAGE_BOUGHT)
			msg = self.npcHandler:parseMessage(msg, parseInfo)
			player:sendTextMessage(MESSAGE_INFO_DESCR, msg)
			player:removeMoney(totalCost)
			self.npcHandler.talkStart[cid] = os.time()
			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, ignoreEquipped, _)
		local shopItem = self:getShopItem(itemid, subType)
		if shopItem == nil then
			error("[ShopModule.onSell] items[itemid] == nil")
			return false
		end

		if shopItem.sell == -1 then
			error("[ShopModule.onSell] attempt to sell a non-sellable item")
			return false
		end

		local player = Player(cid)
		local parseInfo = {
			[TAG_PLAYERNAME] = player:getName(),
			[TAG_ITEMCOUNT] = amount,
			[TAG_TOTALCOST] = amount * shopItem.sell,
			[TAG_ITEMNAME] = shopItem.name
		}

		if not ItemType(itemid):isFluidContainer() then
			subType = -1
		end

		if player:removeItem(itemid, amount, subType, ignoreEquipped) then
			local msg = self.npcHandler:getMessage(MESSAGE_SOLD)
			msg = self.npcHandler:parseMessage(msg, parseInfo)
			player:sendTextMessage(MESSAGE_INFO_DESCR, msg)
			player:addMoney(amount * shopItem.sell)
			self.npcHandler.talkStart[cid] = os.time()
			return true
		else
			local msg = self.npcHandler:getMessage(MESSAGE_NEEDITEM)
			msg = self.npcHandler:parseMessage(msg, parseInfo)
			player:sendCancelMessage(msg)
			self.npcHandler.talkStart[cid] = os.time()
			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

		if(not module.npcHandler:onTradeRequest(cid)) then
			return false
		end

		local itemWindow = {}
		for i = 1, #module.npcHandler.shopItems do
			table.insert(itemWindow, module.npcHandler.shopItems[i])
		end

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

		local parseInfo = { [TAG_PLAYERNAME] = Player(cid):getName() }
		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)) or shop_npcuid[cid] ~= getNpcCid() then
			return false
		end
		shop_npcuid[cid] = 0

		local parentParameters = node:getParent():getParameters()
		local parseInfo = {
			[TAG_PLAYERNAME] = Player(cid):getName(),
			[TAG_ITEMCOUNT] = shop_amount[cid],
			[TAG_TOTALCOST] = shop_cost[cid] * shop_amount[cid],
			[TAG_ITEMNAME] = shop_rlname[cid]
		}

		if(shop_eventtype[cid] == SHOPMODULE_SELL_ITEM) then
			local ret = doPlayerSellItem(cid, shop_itemid[cid], shop_amount[cid], shop_cost[cid] * shop_amount[cid])
			if(ret == LUA_NO_ERROR) 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(shop_eventtype[cid] == SHOPMODULE_BUY_ITEM) then
			local cost = shop_cost[cid] * shop_amount[cid]
			if Player(cid):getMoney() < cost then
				local msg = module.npcHandler:getMessage(MESSAGE_MISSINGMONEY)
				msg = module.npcHandler:parseMessage(msg, parseInfo)
				module.npcHandler:say(msg, cid)
				return false
			end

			local a, b = doNpcSellItem(cid, shop_itemid[cid], shop_amount[cid], shop_subtype[cid], false, false, 1988)
			if(a < shop_amount[cid]) then
				local msgId = MESSAGE_NEEDMORESPACE
				if(a == 0) then
					msgId = MESSAGE_NEEDSPACE
				end

				local msg = module.npcHandler:getMessage(msgId)
				msg = module.npcHandler:parseMessage(msg, parseInfo)
				module.npcHandler:say(msg, cid)
				if(a > 0) then
					Player(cid):removeMoney(a * shop_cost[cid])
					if shop_itemid[cid] == ITEM_PARCEL then
						doNpcSellItem(cid, ITEM_LABEL, shop_amount[cid], shop_subtype[cid], true, false, 1988)
					end
					return true
				end
				return false
			else
				local msg = module.npcHandler:getMessage(MESSAGE_ONBUY)
				msg = module.npcHandler:parseMessage(msg, parseInfo)
				module.npcHandler:say(msg, cid)
				Player(cid):removeMoney(cost)
				if shop_itemid[cid] == ITEM_PARCEL then
					doNpcSellItem(cid, ITEM_LABEL, shop_amount[cid], shop_subtype[cid], true, false, 1988)
				end
				return true
			end
		elseif(shop_eventtype[cid] == SHOPMODULE_BUY_ITEM_CONTAINER) then
			local ret = doPlayerBuyItemContainer(cid, shop_container[cid], shop_itemid[cid], shop_amount[cid], shop_cost[cid] * shop_amount[cid], shop_subtype[cid])
			if(ret == LUA_NO_ERROR) 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(cid)
		return true
	end

	-- onDecline 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)) or shop_npcuid[cid] ~= getNpcCid() then
			return false
		end
		shop_npcuid[cid] = 0

		local parentParameters = node:getParent():getParameters()
		local parseInfo = {
			[TAG_PLAYERNAME] = Player(cid):getName(),
			[TAG_ITEMCOUNT] = shop_amount[cid],
			[TAG_TOTALCOST] = shop_cost[cid] * shop_amount[cid],
			[TAG_ITEMNAME] = shop_rlname[cid]
		}

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

		if(not module.npcHandler:onTradeRequest(cid)) then
			return true
		end

		local count = module:getCount(message)
		module.amount = count

		shop_amount[cid] = module.amount
		shop_cost[cid] = parameters.cost
		shop_rlname[cid] = parameters.realName
		shop_itemid[cid] = parameters.itemid
		shop_container[cid] = parameters.container
		shop_npcuid[cid] = getNpcCid()
		shop_eventtype[cid] = parameters.eventType
		shop_subtype[cid] = parameters.subType

		local parseInfo = {
			[TAG_PLAYERNAME] = Player(cid):getName(),
			[TAG_ITEMCOUNT] = shop_amount[cid],
			[TAG_TOTALCOST] = shop_cost[cid] * shop_amount[cid],
			[TAG_ITEMNAME] = shop_rlname[cid]
		}

		if(shop_eventtype[cid] == SHOPMODULE_SELL_ITEM) then
			local msg = module.npcHandler:getMessage(MESSAGE_SELL)
			msg = module.npcHandler:parseMessage(msg, parseInfo)
			module.npcHandler:say(msg, cid)
		elseif(shop_eventtype[cid] == SHOPMODULE_BUY_ITEM) then
			local msg = module.npcHandler:getMessage(MESSAGE_BUY)
			msg = module.npcHandler:parseMessage(msg, parseInfo)
			module.npcHandler:say(msg, cid)
		elseif(shop_eventtype[cid] == 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