local component = require("component")
local controller = component.proxy(component.me_controller.address)
local gpu = component.gpu

local process = require("process")
local shell = require("shell")
local fs = require("filesystem")
local text = require("text")

local execution_path = shell.resolve(process.info().path)
execution_path = execution_path:sub(1, -16)

if fs.exists(execution_path .. "storekeeper.cfg") == false then
  print("No configuration found!")
  print("Please create a storekeeper.cfg file.")
  os.exit()
end

local cfg = io.open(execution_path .. "storekeeper.cfg", "r")

local toStock = {}

for line in cfg:lines() do
  local splitString = {}
  for match in (line.."|"):gmatch("(.-)".."|") do
    table.insert(splitString, match)
  end
  table.insert(toStock, splitString)
end

local toCraft = {}

for _,stockable in ipairs(toStock) do
  craftables = controller.getCraftables({label = stockable[1]})
  
  local length = 0
  
  for _,item in pairs(craftables) do
    length = length + 1
  end
  
  if length == 1 then
    error("Craftable not found: " .. stockable[1])
  elseif length > 2 then
    error("More than 1 crafting recipe associated with label: " .. stockable[1])
  end
  
  local itemstack = craftables[1].getItemStack()
  print("Craftable found: " .. itemstack.label .. " (" .. itemstack.name .. ")")
  
  table.insert(toCraft, {craftables[1], tonumber(stockable[2])})
end

local activeCraftingOperations = {}

function clearOldOperations()
  for index, operation in ipairs(activeCraftingOperations) do
    if operation[2].isCanceled() then
      print("Crafting of " .. operation[1].label .. " failed or cancelled")
      table.remove(activeCraftingOperations, index)
    elseif operation[2].isDone() then
      print("Crafting of " .. operation[1].label .. " completed since last check")
      table.remove(activeCraftingOperations, index)
    end
  end
end

function checkActiveOperations(givenstack)
  for _,operation in ipairs(activeCraftingOperations) do
    if operation[1].label == givenstack.label then
      return true
    end
  end
  return false
end

while true do
  for _,craftable in ipairs(toCraft) do
    local itemstack = craftable[1].getItemStack()
    if not checkActiveOperations(itemstack) then
      local networkContents = controller.getItemsInNetwork({label = itemstack.label})
      if networkContents == nil or networkContents[1].size == nil then
        print("0 " .. itemstack.label .. " found in ME (target " .. tostring(craftable[2]) ") - crafting "  .. tostring(craftable[2]))
        local operation = craftable[1].request(craftable[2])
        table.insert(activeCraftingOperations, {itemstack, operation})
      elseif networkContents[1].size < craftable[2] then
        print("Only " .. tostring(networkContents[1].size) .. " " .. itemstack.label .. " found in ME (target " .. tostring(craftable[2]) .. ") - crafting " .. tostring(craftable[2] - networkContents[1].size))
        local operation = craftable[1].request(craftable[2] - networkContents[1].size)
        table.insert(activeCraftingOperations, {itemstack, operation})
      end
    end
  end
  clearOldOperations()
  os.sleep(10)
end