[NPC] Request

<?xml version="1.0" encoding="UTF-8"?>
<npc name="eventer" script="event.lua" walkinterval="2000" floorchange="0">
	<health now="100" max="100"/>
	<look type="139" head="20" body="39" legs="45" feet="7" addons="0"/>
	 <parameters>
                <parameter key="message_greet" value="Hello |PLAYERNAME|.i hope you are here to help me to get my demon dusts from thos devils.Ask me for {reward} if so."/>
                <parameter key="message_farewell" value="Good bye."/>
                <parameter key="message_walkaway" value="Farewell then.." />
    </parameters>

</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

local items = { ["demon armor"] = { cost = 5906, count = 50},  -- [itemid] 
                ["demon legs"] = {cost = 5906, count = 50},
				["demon helmet"] = {cost = 5906, count = 20}
			 }

 function creatureSayCallback(cid, type, msg)
    if(not npcHandler:isFocused(cid)) then
        return false
    end
    local talkUser = NPCHANDLER_CONVBEHAVIOR == CONVERSATION_DEFAULT and 0 or cid

    if msgcontains(msg, 'reward') then
	   selfSay("Then, I assume you have some demon dusts for me right?",cid)
	   talkState[talkUser] =1
    elseif msgcontains(msg, 'yes') and  talkState[talkUser] == 1 then
	      selfSay("I exchange : {Demon Armor} for 50 dmeon dusts, {Demon Legs} for 50 dmeon dusts, {Demon Helemt} for 20 demon dusts.",cid)
	         talkState[talkUser] = 3
    elseif msgcontains(msg, 'no') and  talkState[talkUser] == 1 then
	      selfSay("Then, Why are you bothering me?!.",cid)
	         talkState[talkUser] = 0
    end
    for k, v in pairs(items) do
        if msgcontains(msg, k) and  talkState[talkUser] == 3 then
	      if not doPlayerRemoveItem(cid, v.cost,v.count) then
		       selfSay("Seems you dont have ".. v.count .." x demon dusts.Go away noob!.",cid)
			    talkState[talkUser] = 0
	     else
		      doPlayerAddItem(cid,getItemIdByName(k),1)
		      selfSay("Here you are.",cid)
			    talkState[talkUser] = 0
	     end
	end 
    end
return true
end
npcHandler:setCallback(CALLBACK_MESSAGE_DEFAULT, creatureSayCallback)
npcHandler:addModule(FocusModule:new())