-- microexpansion/machines.lua

local me = microexpansion

local netdrives

-- load drives
local function load_drives()
  local f = io.open(me.worldpath.."/microexpansion_drives", "r")
  if f then
    netdrives = minetest.deserialize(f:read("*all")) or {}
    f:close()
    if type(res) == "table" then
      for _,d in pairs(res) do
       table.insert(netdrives,d)
      end
    end
  end
end

-- load now
load_drives()

-- save drives
local function save_drives()
  local f = io.open(me.worldpath.."/microexpansion_drives", "w")
  f:write(minetest.serialize(netdrives))
  f:close()
end

-- save on server shutdown
minetest.register_on_shutdown(save_drives)

local function get_drive_controller(pos)
  for i,d in pairs(netdrives) do
    if d.dpos then
      if vector.equals(pos, d.dpos) then
        return d,i
      end
    end
  end
  return --false,#netdrives+1
end

local function set_drive_controller(dpos,setd,cpos,i)
  if i then
    local dt = netdrives[i]
    if dt then
      if setd then
        dt.dpos = dpos
      end
      if cpos ~= nil then
        dt.cpos = cpos
      end
    else
      netdrives[i] = {dpos = dpos, cpos = cpos}
    end
  else
    local dt = get_drive_controller(dpos)
    if dt then
      if setd then
        dt.dpos = dpos
      end
      if cpos ~= nil then
        dt.cpos = cpos
      end
    else
      table.insert(netdrives,{dpos = dpos, cpos = cpos})
    end
  end
end

local function write_to_cell(cell, items, item_count)
	local size = microexpansion.get_cell_size(cell:get_name())
	local item_meta = cell:get_meta()
	--print(dump2(items,"cell_items"))
	item_meta:set_string("items", minetest.serialize(items))
	local base_desc = minetest.registered_craftitems[cell:get_name()].microexpansion.base_desc
	-- Calculate Percentage
	local percent = math.floor(item_count / size * 100)
	-- Update description
	item_meta:set_string("description", base_desc.."\n"..
		minetest.colorize("grey", tostring(item_count).."/"..tostring(size).." Items ("..tostring(percent).."%)"))
	return cell
end

local function write_drive_cells(pos,network) --args: pos, listname, index, stack, player
  local meta = minetest.get_meta(pos)
  local own_inv = meta:get_inventory()
  if network == nil then
    return false
  end
  local ctrl_inv = network:get_inventory()
  local cells = {}
  for i = 1, own_inv:get_size("main") do
    local cell = own_inv:get_stack("main", i)
    local name = cell:get_name()
    if name ~= "" then
      cells[i] = cell
    end
  end
  local cell_idx = next(cells)
  if cell_idx == nil then
    return
  end
  local size = microexpansion.get_cell_size(cells[cell_idx]:get_name())
  local items_in_cell_count = 0
  local cell_items = {}

  for i = 1, ctrl_inv:get_size("main") do
    local stack_inside = ctrl_inv:get_stack("main", i)
    local stack_name = stack_inside:get_name()
    if stack_name ~= "" then
      local item_count = stack_inside:get_count()
      while item_count ~= 0 and cell_idx ~= nil do
        --print(("stack to store: %s %i"):format(stack_name,item_count))
        if size < items_in_cell_count + item_count then
          local space = size - items_in_cell_count
          table.insert(cell_items,("%s %i"):format(stack_name,space))
          items_in_cell_count = items_in_cell_count + space

          own_inv:set_stack("main", cell_idx, write_to_cell(cells[cell_idx],cell_items,items_in_cell_count))
          cell_idx = next(cells, cell_idx)
          if cell_idx == nil then
            --there may be other drives within the network
            minetest.log("info","too many items to store in drive")
            break
          end
          size = microexpansion.get_cell_size(cells[cell_idx]:get_name())
          items_in_cell_count = 0
          cell_items = {}
          item_count = item_count - space
        else
          items_in_cell_count = items_in_cell_count + item_count
          table.insert(cell_items, ("%s %i"):format(stack_name,item_count))
          item_count = 0
        end
      end
    end
    if cell_idx == nil then
      break
    end
  end
  while cell_idx ~= nil do
    own_inv:set_stack("main", cell_idx, write_to_cell(cells[cell_idx],cell_items,items_in_cell_count))
    items_in_cell_count = 0
    cell_items = {}
    cell_idx = next(cells, cell_idx)
  end

  return true
end

local function take_all(pos,net)
  local meta = minetest.get_meta(pos)
  local own_inv = meta:get_inventory()
  local ctrl_inv = net:get_inventory()
  local items = {}
  for i = 1, own_inv:get_size("main") do
    local stack = own_inv:get_stack("main", i)
    local name = stack:get_name()
    if name ~= "" then
      local its = minetest.deserialize(stack:get_meta():get_string("items"))
      for _,s in pairs(its) do
        table.insert(items,s)
      end
    end
  end 
  for _,ostack in pairs(items) do
    --this returns 99 (max count) even if it removes more
    ctrl_inv:remove_item("main", ostack)
    print(ostack)
  end
  
  net:update()
  me.send_event(pos,"items")
end

local function add_all(pos,net)
  local meta = minetest.get_meta(pos)
  local own_inv = meta:get_inventory()
  local ctrl_inv = net:get_inventory()
  local items = {}
  for i = 1, own_inv:get_size("main") do
    local stack = own_inv:get_stack("main", i)
    local name = stack:get_name()
    if name ~= "" then
      local its = minetest.deserialize(stack:get_meta():get_string("items"))
      if its then
        for _,s in pairs(its) do
          table.insert(items,s)
        end
      end
    end
  end 
  for _,ostack in pairs(items) do
    me.insert_item(ostack, ctrl_inv, "main")
    print(ostack)
  end
  
  net:update()
  me.send_event(pos,"items",{net = net})
end

function me.disconnect_drive(pos,ncpos)
  minetest.log("action","disconnecting drive at "..minetest.pos_to_string(pos))
  local fc,i = get_drive_controller(pos)
  if not fc.cpos then
    return
  end
  local fnet = me.get_network(fc.cpos)
  write_drive_cells(pos,fnet)
  if ncpos then
    set_drive_controller(pos,false,ncpos,i)
  else
    set_drive_controller(pos,false,false,i)
  end
  if fnet then
    take_all(pos,fnet)
  else
    minetest.log("warning","drive couldn't take items from its former network")
  end
end

local function update_drive(pos,_,ev)
  if ev.type~="connect" and ev.type~="disconnect" then
    return
  end
  local fc,i = get_drive_controller(pos)
  local cnet = ev.net or me.get_connected_network(pos)
  if cnet then
    if not fc then
      minetest.log("action","connecting drive at "..minetest.pos_to_string(pos))
      set_drive_controller(pos,true,cnet.controller_pos,i)
      add_all(pos,cnet)
    elseif not fc.cpos then
      minetest.log("action","connecting drive at "..minetest.pos_to_string(pos))
      set_drive_controller(pos,false,cnet.controller_pos,i)
      add_all(pos,cnet)
    elseif not vector.equals(fc.cpos,cnet.controller_pos) then
      minetest.log("action","reconnecting drive at "..minetest.pos_to_string(pos))
      write_drive_cells(pos,me.get_network(fc.cpos))
      set_drive_controller(pos,false,cnet.controller_pos,i)
      add_all(pos,cnet)
      me.disconnect_drive(pos,cnet.controller_pos)
    else
      if ev.origin.name == "microexpansion:ctrl" then
        me.disconnect_drive(pos,false)
      end
    end
  else
    if fc then
      if fc.cpos then
        me.disconnect_drive(pos,false)
      end
    end
  end
end

-- [me chest] Register node
microexpansion.register_node("drive", {
	description = "ME Drive",
	usedfor = "Stores items into ME storage cells",
	tiles = {
		"chest_top",
		"chest_top",
		"chest_side",
		"chest_side",
		"chest_side",
		"drive_full",
	},
	recipe = {
    { 1, {
        {"default:steel_ingot",   "default:chest",               "default:steel_ingot" },
        {"default:steel_ingot", "microexpansion:machine_casing", "default:steel_ingot" },
        {"default:steel_ingot",        "default:chest",          "default:steel_ingot" },
      },
    }
  },
	is_ground_content = false,
	groups = { cracky = 1, me_connect = 1 },
	paramtype = "light",
	paramtype2 = "facedir",
	me_update = update_drive,
	on_construct = function(pos)
		local meta = minetest.get_meta(pos)
		meta:set_string("formspec",
			"size[9,9.5]"..
			microexpansion.gui_bg ..
			microexpansion.gui_slots ..
		[[
			label[0,-0.23;ME Drive]
			list[context;main;0,0.3;8,4]
			list[current_player;main;0,5.5;8,1;]
			list[current_player;main;0,6.73;8,3;8]
			listring[current_name;main]
			listring[current_player;main]
			field_close_on_enter[filter;false]
		]])
		local inv = meta:get_inventory()
		inv:set_size("main", 10)
		me.send_event(pos,"connect")
	end,
	can_dig = function(pos)
		local meta = minetest.get_meta(pos)
		local inv = meta:get_inventory()
		return inv:is_empty("main")
	end,
	after_destruct = function(pos)
   me.send_event(pos,"disconnect")
  end,
	allow_metadata_inventory_put = function(_, _, _, stack)
		if minetest.get_item_group(stack:get_name(), "microexpansion_cell") ~= 0 then
			return 1
		else
			return 0
		end
	end,
	on_metadata_inventory_put = function(pos, _, _, stack)
		me.send_event(pos,"item_cap")
		local network = me.get_connected_network(pos)
		if network == nil then
			return
		end
		local ctrl_inv = network:get_inventory()
		local items = minetest.deserialize(stack:get_meta():get_string("items"))
		if items == nil then
			print("no items")
			me.send_event(pos,"items",{net=network})
			return
		end
		network:set_storage_space(#items)
		for _,s in pairs(items) do
			me.insert_item(s, ctrl_inv, "main")
		end
		me.send_event(pos,"items",{net=network})
	end,
	allow_metadata_inventory_take = function(pos,_,_,stack) --args: pos, listname, index, stack, player
    local network = me.get_connected_network(pos)
		write_drive_cells(pos,network)
		return stack:get_count()
	end,
	on_metadata_inventory_take = function(pos, _, _, stack)
		local network = me.get_connected_network(pos)
		if network == nil then
			return
		end
		me.send_event(pos,"item_cap",{net=network})
		local ctrl_inv = network:get_inventory()
		local items = minetest.deserialize(stack:get_meta():get_string("items"))
		if items == nil then
		  network:update()
			return
		end
		for _,ostack in pairs(items) do
			--this returns 99 (max count) even if it removes more
			ctrl_inv:remove_item("main", ostack)
		end
		--print(stack:to_string())

    network:update()
		me.send_event(pos,"items",{net=network})
	end,
})