NPC doesn't count

[auda]

My NPC who sell fluids, blank runes and buy empty vials. The problem here is that he doesn't count, as for example:

13:14 Gamemaster Auda: sell 5 vials
13:14 Icarus: Do you want to sell each 5 vials for 5 gold?

The code:

_state = 0
_count = 0
_index = 0
_delay = 1000

items = {}
items[0] = {name = 'blank rune', id = 2260, subtype = -1, sell = 10}
items[1] = {name = 'mana fluid', id = 2006, subtype = 7, sell = 50}
items[2] = {name = 'life fluid', id = 2006, subtype = 10, sell = 45}
items[3] = {name = 'vial', id = 2006, subtype =-1, buy = 5}
function getNext()
    nextPlayer = getQueuedPlayer()
    if (nextPlayer ~= nil) then
        if (getDistanceToCreature(nextPlayer) <= 4) then
            updateNpcIdle()
            setNpcFocus(nextPlayer)
            greet(nextPlayer, _delay * 3)
            return
        else
            getNext()
        end
    end


    setNpcFocus(0)
    resetNpcIdle()
end

local function onActionItem(action)
    if ((action == 'buy' and items[_index].sell == -1) or
        (action == 'sell' and items[_index].buy == -1)) then
        return
    end
   
    amount = ''
    suffix = ''
    plural = 'a'
   
    if (_count > 1) then
        amount = ' ' .. tostring(_count)
        suffix = 's'
        plural = ''
    end
   
    cost = items[_index].buy
    if (action == 'buy') then
        cost = items[_index].sell
    end
   
    selfSay('Do you want to ' .. action .. ' each ' .. plural .. amount .. ' ' .. items[_index].name .. suffix .. ' for ' .. cost .. ' gold?')
end

function _selfSay(message)
    selfSay(message, _delay)
    updateNpcIdle()
end

local function greet(cid, delay)
    selfSay('Hi there ' .. getCreatureName(cid) .. '.', delay)
end

function onCreatureAppear(cid)
end

function onCreatureDisappear(cid)
    if (getNpcFocus() == cid) then
        selfSay('See you.', _delay)
        getNext()
    else
        unqueuePlayer(cid)
    end
end

function onCreatureMove(cid, oldPos, newPos)
    if (getNpcFocus() == cid) then
        faceCreature(cid)
    end
end

function onCreatureSay(cid, type, msg)
    if (getNpcFocus() == 0) then
        if ((msgcontains(msg, 'hi') or msgcontains(msg, 'hello')) and getDistanceToCreature(cid) <= 4) then
            updateNpcIdle()
            setNpcFocus(cid)
            greet(cid, _delay)
        end
       
    elseif (getNpcFocus() ~= cid) then
        if ((msgcontains(msg, 'hi') or msgcontains(msg, 'hello')) and getDistanceToCreature(cid) <= 4) then
            selfSay('Just wait, ' .. getCreatureName(cid) .. '.', _delay)
            queuePlayer(cid)
        end
       
    else
        if (msgcontains(msg, 'bye')) then
            selfSay('See you.', _delay)
            getNext()
       
        elseif (msgcontains(msg, 'name')) then
            _selfSay('I am Icarus')
       
        elseif (msgcontains(msg, 'job')) then
            _selfSay('I study the art of spellcasting and conjuring.')
       
        elseif (msgcontains(msg, 'king') or msgcontains(msg, 'calvin')) then
            _selfSay('I was kicked out of the city castle by Calvin himself for one slight miscalculation!')
       
        elseif (msgcontains(msg, 'ferumbras')) then
            _selfSay('We do not speak of him here...')
       
        elseif (msgcontains(msg, 'meadowfield')) then
            _selfSay('Hmpf!')
       
        elseif (msgcontains(msg, 'offer') or msgcontains(msg, 'goods')) then
            _selfSay('I\'m selling runes and fluids.')
           
        elseif (msgcontains(msg, 'rune') and not(msgcontains(msg, 'blank'))) then
            _selfSay('I only sell blank runes, for the sake of security.')
           
        elseif (_state == 1) then
            if (msgcontains(msg, 'yes')) then
                if (doPlayerRemoveMoney(cid, items[_index].sell * _count) == 1) then
                    for i = 1, _count do
                        doPlayerAddItem(cid, items[_index].id, items[_index].subtype)
                    end
               
                    selfSay('Here you are.', _delay)
                else
                    selfSay('Come back down here when you have money.', _delay)
                end
               
                updateNpcIdle()
            else
                selfSay('Hmm.', _delay)
            end
           
            _state = 0
           
        elseif (_state == 2) then
            if (msgcontains(msg, 'yes')) then
                if (doPlayerRemoveItem(cid, items[_index].id, _count, items[_index].subtype) == 1) then
                    doPlayerAddMoney(cid, items[_index].buy * _count)
                    selfSay('Ok. Here is your money.')
                else
                    if (count > 1) then
                        selfSay('Sorry, you do not have so many.', _delay)
                    else
                        selfSay('Sorry, you do not have one.', _delay)
                    end
                end
               
                updateNpcIdle()
            else
                selfSay('Perhaps another time.', _delay)
            end
       
            _state = 0
           
        else
            for n = 0, table.getn(items) do
                if (msgcontains(msg, items[n].name) or msgcontains(msg, items[n].name .. "s")) then
                    _count = getCount(msg)
                    _index = n
                   
                    if (msgcontains(msg, 'sell')) then
                        onActionItem('sell')
                        _state = 2
                    else
                        onActionItem('buy')
                        _state = 1
                    end
                   
                    updateNpcIdle()
                    break
                end
            end
        end
    end
end

function onThink()
    if (getNpcFocus() ~= 0) then
        if (isNpcIdle() or getDistanceToCreature(getNpcFocus()) > 4) then
            selfSay('See you.', _delay)
            getNext()
        end
    end
end

Thanks a lot for all the help I've gotten so far.