exhaustion function

exhaustion =
{
    check = function (cid, storage)
        return getPlayerStorageValue(cid, storage) >= os.time(t)
    end,

    get = function (cid, storage)
        local exhaust = getPlayerStorageValue(cid, storage)
        if(exhaust > 0) then
            local left = exhaust - os.time(t)
            if(left >= 0) then
                return left
            end
        end

        return false
    end,

    set = function (cid, storage, time)
        setPlayerStorageValue(cid, storage, os.time(t) + time)
    end,

    make = function (cid, storage, time)
        local exhaust = exhaustion.get(cid, storage)
        if(not exhaust) then
            exhaustion.set(cid, storage, time)
            return true
        end

        return false
    end
}