Adding charges to weapons

[Death-Pulse]

I want this gem script to add charges everytime they use the gem on the staff, like it enchantes it and gives it 1 charge but it wont do it again and again

local config = {
    manaCost = 300,
    soulCost = 2
}

function onUse(cid, item, fromPosition, itemEx, toPosition)
    if(item.itemid == 2147 and itemEx.itemid == 2342) then
        doTransformItem(itemEx.uid, 2343)
        doDecayItem(itemEx.uid)
        doRemoveItem(item.uid, 1)

        doSendMagicEffect(toPosition, CONST_ME_MAGIC_RED)
        return true
    end

    if(item.itemid == 7760 and isInArray({2401}, itemEx.itemid)) then
        doTransformItem(itemEx.uid, 2433)
        doRemoveItem(item.uid, 1)

        doSendMagicEffect(toPosition, CONST_ME_MAGIC_RED)
        return true
    end

    if(isInArray(enchantableGems, item.itemid)) then
        local subtype = item.type
        if(subtype == 0) then
            subtype = 1
        end

        local mana = config.manaCost * subtype
        if(getPlayerMana(cid) < mana) then
            doPlayerSendDefaultCancel(cid, RETURNVALUE_NOTENOUGHMANA)
            return true
        end

        local soul = config.soulCost * subtype
        if(getPlayerSoul(cid) < soul) then
            doPlayerSendDefaultCancel(cid, RETURNVALUE_NOTENOUGHSOUL)
            return true
        end

        local a = table.find(enchantableGems, item.itemid)
        if(a == nil or not isInArray(enchantingAltars[a], itemEx.itemid)) then
            return false
        end

        doTransformItem(item.uid, enchantedGems[a])
        doPlayerAddMana(cid, -mana)
        doPlayerAddSoul(cid, -soul)

        doPlayerAddSpentMana(cid, mana)
        doSendMagicEffect(fromPosition, CONST_ME_HOLYDAMAGE)
        return true
    end
    if(isInArray(enchantedGems, item.itemid)) then
        if(not isInArray(enchantableItems, itemEx.itemid)) then
            doSendMagicEffect(fromPosition, CONST_ME_POFF)
            return false
        end

        local b = table.find(enchantedGems, item.itemid)
        if(b == nil) then
            return false
        end

        local subtype = itemEx.type
        if(not isInArray({2544, 8905}, itemEx.itemid)) then
            subtype = 1000
        end

        doTransformItem(itemEx.uid, enchantedItems[itemEx.itemid][b], subtype)
        doSendMagicEffect(getThingPos(itemEx.uid), CONST_ME_HOLYDAMAGE)
        doDecayItem(itemEx.uid)

        doRemoveItem(item.uid, 1)
        return true
    end

    return false
end