Help me with mining system

[Gothrim]

Im trying to make mining system. It's working partially, but i can't finish it.
It's based on "Weedcuting System".

<config name="mining Lib"><![CDATA[
mining = {}

mining.ironreward = 5880
mining.coalreward = 10609
mining.exhaust = 2 * 1000
mining.ironveins = {8740, 8741, 8742, 8743}
mining.coalveins = {8748, 8749, 8750, 8751}
mining.try = {"uderza kilofem w skale z lewej", "uderza kilofem w skale z prawej", "bierze spory zamach kilofem i uderza", "uderza kilofem w skale", "trzymajac trzonek kilofu w dloniach usiluje rozlupac skale", "uderza kilofem w skale z nad glowy", "uderza kilofem w skale i wokol rozsypuja sie iskry",}
mining.maxLevel = 100
mining.stor = {878, 877}
mining.showLevel = true


function mining.getPlayerSkill(cid)
        return getPlayerStorageValue(cid, mining.stor[1])
end

function mining.addSkillTry(cid)
        if(getPlayerStorageValue(cid, mining.stor[1]) >= mining.maxLevel) then
                return true
        end
        local formula = getPlayerStorageValue(cid, mining.stor[1]) / 10
        if(math.random(1, formula) == 1) then
                if(getPlayerStorageValue(cid, mining.stor[2]) >= (getPlayerStorageValue(cid, 876) + (getPlayerStorageValue(cid, 876) * (getPlayerStorageValue(cid, 876) / 2))) * (getPlayerStorageValue(cid, 876) / 5.25)) then
                        setPlayerStorageValue(cid, mining.stor[2], 0)
                        setPlayerStorageValue(cid, mining.stor[1], getPlayerStorageValue(cid, mining.stor[1])+1)
                        doPlayerSendTextMessage(cid, MESSAGE_EVENT_ADVANCE, "You advanced in Mining. "..(mining.showLevel == true and "["..getPlayerStorageValue(cid, mining.stor[1]).."]" or "").."")
                else
                        setPlayerStorageValue(cid, mining.stor[2], getPlayerStorageValue(cid, mining.stor[2])+1)
                end
        end
return true
end
]]></config>

<action itemid="2553" event="script"><![CDATA[
        domodlib("mining Lib")

function onUse(cid, item, fromPosition, itemEx, toPosition)

                if(isInArray(mining.ironveins, itemEx.itemid) == false) then
                        return false
                end

local dlonie = {getPlayerSlotItem(cid, 6).itemid, getPlayerSlotItem(cid, 5).itemid}
                if(isInArray(dlonie, item.itemid) == false) then
                        doPlayerSendTextMessage(cid, MESSAGE_INFO_DESCR, "Trzymaj " .. getItemNameById(item.itemid) .. " w dloni!")
                        return false
                end
                   

                if(getPlayerStorageValue(cid, 800) <= -1) then
                mining.addSkillTry(cid)
       	        local teksty = (math.random(1, 7))
                doCreatureSay(cid, getCreatureName(cid) .. ' ' .. mining.try[teksty] .. '.', TALKTYPE_MONSTER)
                doSendMagicEffect(toPosition, 9)
                setPlayerStorageValue(cid, 800, 1)
                local params = {cid = cid}
                addEvent(innego, mining.exhaust, params)
                if(math.random(mining.getPlayerSkill(cid), mining.maxLevel) >= mining.maxLevel) then
                        local itemid = itemEx.itemid
                        doPlayerAddItem(cid, mining.ironreward, (math.random(0, 2)), true)
                        doRemoveItem(itemEx.uid, 1)
                        doCreatureSay(cid, 'Skala ulegla sile jego miesni odslaniajac cenny kruszec', TALKTYPE_MONSTER)
                        doCreateItem(1336, 1, toPosition)
                        addEvent(function()
                                doRemoveItem(getThingFromPos(toPosition).uid)
                                pien = doCreateItem(1336, 1, toPosition)
                                doSendMagicEffect(toPosition, 44)
                                addEvent(function()
                                        doSendMagicEffect(toPosition, 44)
                                        doRemoveItem(getThingFromPos(toPosition).uid)
                                        doCreateItem(itemid, 1, toPosition)
                                end, 1 * 5 * 1000, {itemid = itemid, toPosition = toPosition})
                        end, 1 * 5 * 1000, {itemid = itemid, toPosition = toPosition})
                end
                else
                doCreatureSay(cid, getCreatureName(cid) .. ' nieco sie pospieszyl i wykonal za slaby zamach.', TALKTYPE_MONSTER)
                return false
                end
        end


function innego(params)
  if isPlayer(params.cid) then
      setPlayerStorageValue(params.cid, 800, "-1")
  end
end

And what is wrong?
I want to make this script recognize itemid of itemex vein and give another reward for mining.ironveins and another reward for mining.coalveins. There shall be another formula for succes:

(math.random(mining.getPlayerSkill(cid), mining.maxLevel) >= mining.maxLevel)

for iron, and

(math.random(mining.getPlayerSkill(cid), mining.maxLevel) >= mining.maxLevel - 1)

for coal

I made it once, but with copying half of code with using IsInArray. This is wrong method - the code is bigger by half and it's not simple to add another veins and another rewards. If I will use this method and try to make 6 veins type, the code will be 6 times bigger!
I need an smart, clear and universal method for that

Thanks