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 talkUser = NPCHANDLER_CONVBEHAVIOR == CONVERSATION_DEFAULT and 0 or cid
   msg = string.lower(msg)
   ---------
   local need = {
      {id = 2092, qt = 1}, --diamond
   }
   local rewards = {
      {id = 14252, qt = 1}, --mega Stone
      {id = 12618, qt = 20}, --booststone
   }
   local stoFinish = 92119
   ---------
   
   if msgcontains(msg, 'help') or msgcontains(msg, 'ajuda') then
      if getPlayerStorageValue(cid, stoFinish) >= 99 then
         selfSay("Sorry, you already had done this quest.", cid)
         talkState[talkUser] = 0
         return true
      end
      selfSay("Olá meu amigo, sou o NPC de trocas, me dê 1 Bone Chave e lhe darei 1 Mega Stone ! Diga YES para trocarmos",cid)
      talkState[talkUser] = 1
      return true 
   elseif msgcontains(msg, 'yes') or msgcontains(msg, 'sim') and talkState[talkUser] == 1 then
      if getPlayerItemCount(cid, need[1].id) < need[1].qt then
         selfSay("Você não me trouxe a Bone Chave...", cid)
         selfSay("Lembre-se, eu preciso de 1 Bone Chave...", cid)
         talkState[talkUser] = 0
         return true
      end
local sto = getFreeTaskStorage(cid)
           if sto == -1 then 
              selfSay("Você não pode fazer essa TASK NoVamente VocÊ ja fez o max de "..(maxTasks).." tasks!", cid)
              talkState[talkUser] = 0
              return true
           end
      for i = 1, #need do
          doPlayerRemoveItem(cid, need[i].id, need[i].qt)
      end
      for i = 1, #rewards do
          doPlayerAddItem(cid, rewards[i].id, rewards[i].qt)
               doPlayerAddExperience(cid, 0)
      end
 selfSay("Obrigado, tchau!", cid)
      setPlayerStorageValue(cid, stoFinish, 1)
      talkState[talkUser] = 0
      return true
   end
   return true
end       
                    
npcHandler:setCallback(CALLBACK_MESSAGE_DEFAULT, creatureSayCallback)
npcHandler:addModule(FocusModule:new())