local focus = 0
local talk_start = 0
local price = 0
local conv = 0
function msgcontains(txt, str)
return (string.find(txt, str) and not string.find(txt, '(%w+)' .. str) and not string.find(txt, str .. '(%w+)'))
end
function onCreatureSay(cid, type, msg)
local msg = string.lower(msg)
if focus == cid then
 talk_start = os.clock()
end
if msgcontains(msg, 'bye') and focus == cid then
 selfSay('Have a nice gambling!')
 focus = 0
return true
end
if msgcontains(msg, 'no') and focus == cid and conv == 0 then
 selfSay('Ok then, feel free to come back whenever you want to.')
 focus = 0
return true
end
if msgcontains(msg, 'hi') and focus == 0 and getDistanceToCreature(cid) <= 3 then
 selfSay("Hello! You are at the Celadon's Gamer Corner. To gamble here, you need cassino coins. Do you want to buy some?")
 focus = cid
 talk_start = os.clock()
 conv = 0
return true
end
if ((msgcontains(msg, 'yes') and conv == 0) or msgcontains(msg, 'coins')) and focus == cid and conv ~= 1 then
 selfSay('Tell me, how many coins do you wish to buy?')
 conv = 1
return true
end
if tonumber(msg) ~= nil and tonumber(msg) >= 1 and tonumber(msg) <= 500 and focus == cid then
 if getPlayerStorageValue(cid, 23254) >= 1000 then
  selfSay("It seems that you already have a lot of coins! You can't buy more coins if you already have more than 1000.")
 return true
 end
 if price / 10 == tonumber(msg) then
 return true
 end
 price = tonumber(msg) * 10
 selfSay(""..msg.." coins are going to cost "..price.." dollars, can you afford it?")
 conv = 3
return true
end
if tonumber(msg) ~= nil and (tonumber(msg) < 1 or tonumber(msg) > 500) and focus == cid then
 selfSay("I can sell only sell amounts between 1 and 500 of coins at once!")
 conv = 2
return true
end
if msgcontains(msg, 'yes') and conv == 3 and focus == cid then
 if getPlayerStorageValue(cid, 23254) == -1 then
  setPlayerStorageValue(cid, 23254, 0)
 end
 if doPlayerRemoveMoney(cid, price * 100) then
					local amount = price / 10
					setPlayerStorageValue(cid, 23254, getPlayerStorageValue(cid, 23254) + amount)
					selfSay("Here you are! You bought "..amount.." cassino coins, have a nice gambling!")
  doPlayerSendTextMessage(cid, MESSAGE_STATUS_CONSOLE_BLUE, "You bought "..amount.." cassino coins. Now you have a total of "..getPlayerStorageValue(cid, 23254).." cassino coins.")
			else
					selfSay("Sorry, buy you don't have enough money to pay for it!")
			end
conv = 2
return true
end
if msgcontains(msg, 'no') and conv == 3 and focus == cid then
	 selfSay("So, would you like to buy any coins?")
conv = 0
return true
end
end

local intervalmin = 38
local intervalmax = 70
local delay = 25
local number = 1
local messages = {"Come here to buy cassino coins! Check our prices!",
"Looking for coins? You can buy them here!",
"Check out our prices! Start gambling today!",
"Did you know you can exchange coins for wonderful prizes?",
  }
function onThink()
if focus == 0 then
 selfTurn(1)
  delay = delay - 0.5
  if delay <= 0 then
selfSay(messages[number])
number = number + 1
 if number > #messages then
  number = 1
 end
delay = math.random(intervalmin, intervalmax)
  end
 return true
else
if not isCreature(focus) then
 focus = 0
return true
end
 local npcpos = getThingPos(getThis())
 local focpos = getThingPos(focus)
 if npcpos.z ~= focpos.z then
  focus = 0
 return true
 end
 if getDistanceToCreature(focus) > 3 then
  selfSay('Come back whenever you want to buy more coins!')
  focus = 0
 return true
 end

 local dir = doDirectPos(npcpos, focpos)
 selfTurn(dir)
end
if os.clock() - talk_start > 59 then
 selfSay('We can talk later, when you are decided about what to buy.')
 focus = 0
end

return true
end