Lua NPC with Trade Box

[lutek14]

I want to add shop to this NPC. But shop will appear only after tell {beer} as is in script (talkstates cannot be removed)


NPC Lua:

local focuses = {}
local talkState = {}

local function isFocused(cid)
for i, v in pairs(focuses) do
if(v == cid) then
return true
end
end
return false
end

local function addFocus(cid)
if(not isFocused(cid)) then
table.insert(focuses, cid)
end
end
local function removeFocus(cid)
for i, v in pairs(focuses) do
if(v == cid) then
table.remove(focuses, i)
break
end
end
end
local function lookAtFocus()
for i, v in pairs(focuses) do
if(isPlayer(v)) then
doNpcSetCreatureFocus(v)
return
end
end
doNpcSetCreatureFocus(0)
end

function onCreatureAppear(cid)
end

function onCreatureDisappear(cid)
if(isFocused(cid)) then
selfSay("Rrrr...")
removeFocus(cid)
end
end

function onCreatureSay(cid, type, msg)
local distance = getDistanceTo(cid) or -1

if((msg == "hi") and not (isFocused(cid)) and (distance <= 4 and distance ~= -1)) then
selfSay("Yup. Hey! Are you Rissam?", cid)
addFocus(cid)
talkState[cid] = 1
end
elseif((msg == "yes") and isFocused(cid)) then
if (talkState[cid] == 1) then
selfSay("I'm not sure... But... What do you want Rissam?! Maybe some {beer}?",cid)
talkState[cid] = 2
elseif((msg == "no") and isFocused(cid)) then
if (talkState[cid] == 1) then
selfSay("Ok... Would you like buy some {beer}?",cid)
talkState[cid] = 2
end
elseif((msg == "beer") and isFocused(cid)) then
if (talkState[cid] == 2) then
selfSay("I've got the best beer...",cid)
talkState[cid] = 3
end
end

function onThink()
for i, focus in pairs(focuses) do
if(not isCreature(focus)) then
removeFocus(focus)
else
local distance = getDistanceTo(focus) or -1
if((distance > 4) or (distance == -1)) then
selfSay("...")
removeFocus(focus)
end
end
end
lookAtFocus()
end

NPC xml:

<?xml version="1.0" encoding="UTF-8"?>
<npc name="Brewer Anton" script="data/npc/scripts/anton.lua" walkinterval="2000" floorchange="0">
<health now="100" max="100"/>
<look type="132" head="3" body="0" legs="19" feet="95" addons="1"/>
</npc>