local class = require('class')
local Logger = require('logger')

local ChestProvider = class()
 
function ChestProvider:init(args)
  
  args = args or { }

  self.stacks = {}
  self.name = 'chest'
  self.direction = args.direction or 'up'
  self.wrapSide = args.wrapSide or 'bottom'
  self.p = peripheral.wrap(self.wrapSide)
end
 
function ChestProvider:isValid()
  return self.p and self.p.getAllStacks
end
 
function ChestProvider:refresh()
  if self.p then
    self.p.condenseItems()
    self.stacks = self.p.getAllStacks(false)
    local t = { }
    for _,s in ipairs(self.stacks) do
      local key = s.id .. ':' .. s.dmg
      if t[key] and t[key].qty < 64 then
        t[key].max_size = t[key].qty
      else
        t[key] = {
          qty = s.qty
        }
      end
    end
    for _,s in ipairs(self.stacks) do
      local key = s.id .. ':' .. s.dmg
      if t[key].max_size then
        s.max_size = t[key].qty
      else
        s.max_size = 64
      end
    end
  end
  return self.stacks
end
 
function ChestProvider:getItemInfo(id, dmg)
  local item = { id = id, dmg = dmg, qty = 0, max_size = 64 }
  for _,stack in pairs(self.stacks) do
    if stack.id == id and stack.dmg == dmg then
      item.name = stack.display_name
      item.qty = item.qty + stack.qty
      item.max_size = stack.max_size
    end
  end
  return item
end
 
function ChestProvider:craft(id, dmg, qty)
  return false
end

function ChestProvider:craftItems(items)
end

function ChestProvider:provide(item, qty, slot)
  if self.p then
    self.stacks = self.p.getAllStacks(false)
    for key,stack in pairs(self.stacks) do
      if stack.id == item.id and stack.dmg == item.dmg then
        local amount = math.min(qty, stack.qty)
        self.p.pushItemIntoSlot(self.direction, key, amount, slot)
        qty = qty - amount
        if qty <= 0 then
          break
        end
      end
    end
  end
end
 
function ChestProvider:insert(slot, qty)
  if self.p then
    local s, m = pcall(function() self.p.pullItem(self.direction, slot, qty) end)
    if not s and m then
      print('chestProvider:pullItem')
      print(m)
      Logger.log('chestProvider', 'Insert failed, trying again')
      sleep(1)
      s, m = pcall(function() self.p.pullItem(self.direction, slot, qty) end)
      if not s and m then
        print('chestProvider:pullItem')
        print(m)
        Logger.log('chestProvider', 'Insert failed again')
      else
        Logger.log('chestProvider', 'Insert successful')
      end
    end
  end
end

return ChestProvider