OC PreCraft system

local component = require("component")
local me = component.me_interface

local items = {
    {id = "IC2:reactorUraniumQuad", dmg = 1, size = 10}
}

local function preCraft(item, dmg, amount, me)
    local meCraftebles = me.getCraftables()
    for k = 1, #meCraftebles do
        local currentItem = meCraftebles[k].getItemStack()
        if currentItem.name == item and currentItem.damage == dmg then
            local isCrafting = meCraftebles[k].request(amount)

            print("Crafting running. Request size " .. tostring(amount) .. ".")

            while 1 do
                if isCrafting.isCanceled() == true then
                    print("Request error.")
                    return false
                end
                if isCrafting.isDone() == true then
                  print("\t Exporting...")
                  print("Craft done!")
                  os.sleep(15)
                  return true
                else
                  print("\tExporting error: " .. er)
                  return false
                end
                os.sleep(0)
            end
        end
    end
end

local function findInNetwork(main)
    while 1 do
        for i = 1, #items do
            local fingerprint = {id = items[i].id, dmg = items[i].dmg}
            print("Looking for " .. items[i].id)
            local _, value = pcall(main.getItemDetail, fingerprint)
            if value ~= nil then
                local itemDetails = value.basic()

                print("Found " .. itemDetails.display_name .. ". Checking size...")
                if itemDetails.qty < items[i].size then
                    print("Need to craft " .. tostring(items[i].size - itemDetails.qty) .. "!")
                    preCraft(items[i].id, items[i].dmg, (items[i].size - itemDetails.qty), main)
                else
                    print("There are " .. tostring(itemDetails.qty) .. " in system, no need to craft it!")
                end
            else
                print("There is no " .. items[i].id .. ". Starting test craft")
                preCraft(items[i].id, items[i].dmg, 1, main)
            end
            print("-------------------------------------------------------------------------------")
        end
    end
    os.sleep(0)
end

ok, err = pcall(findInNetwork)
print(ok, err)
--computer.shutdown(true)