-- Storage buffer. Builder nodes draw from this inventory and digger nodes deposit into it.
-- Note that inventories are digtron group 2.
minetest.register_node("digtron:inventory",
{
	description = "Digtron Inventory Hopper",
	groups = {cracky = 3,  oddly_breakable_by_hand=3, digtron = 2},
	drop = "digtron:inventory",
	sounds = digtron.metal_sounds,
	paramtype2= "facedir",
	is_ground_content = false,
	tiles = {"digtron_inventory.png"},

	on_construct = function(pos)
		local meta = minetest.get_meta(pos)
		meta:set_string("formspec", 
			"size[8,9.3]" ..
			default.gui_bg ..
			default.gui_bg_img ..
			default.gui_slots ..
			"label[0,0;Inventory items]" ..
			"list[current_name;main;0,0.6;8,4;]" ..
			"list[current_player;main;0,5.15;8,1;]" ..
			"list[current_player;main;0,6.38;8,3;8]" ..
			"listring[current_name;main]" ..
			"listring[current_player;main]" ..
			default.get_hotbar_bg(0,5.15)
		)
		local inv = meta:get_inventory()
		inv:set_size("main", 8*4)
	end,
	
	can_dig = function(pos,player)
		local meta = minetest.get_meta(pos)
		local inv = meta:get_inventory()
		return inv:is_empty("main")
	end,
})

-- Fuel storage. Controller node draws fuel from here.
-- Note that fuel stores are digtron group 5.
minetest.register_node("digtron:fuelstore",
{
	description = "Digtron Fuel Hopper",
	groups = {cracky = 3,  oddly_breakable_by_hand=3, digtron = 5},
	drop = "digtron:fuelstore",
	sounds = digtron.metal_sounds,
	paramtype2= "facedir",
	is_ground_content = false,
	tiles = {"digtron_fuelstore.png"},

	on_construct = function(pos)
		local meta = minetest.get_meta(pos)
		meta:set_string("formspec", 
			"size[8,9.3]" ..
			default.gui_bg ..
			default.gui_bg_img ..
			default.gui_slots ..
			"label[0,0;Fuel items]" ..
			"list[current_name;fuel;0,0.6;8,4;]" ..
			"list[current_player;main;0,5.15;8,1;]" ..
			"list[current_player;main;0,6.38;8,3;8]" ..
			"listring[current_name;fuel]" ..
			"listring[current_player;main]" ..
			default.get_hotbar_bg(0,5.15)
		)
		local inv = meta:get_inventory()
		inv:set_size("fuel", 8*4)
	end,
	
	-- Only allow fuel items to be placed in fuel
	allow_metadata_inventory_put = function(pos, listname, index, stack, player)
		if minetest.is_protected(pos, player:get_player_name()) then
			return 0
		end
		if listname == "fuel" then
			if minetest.get_craft_result({method="fuel", width=1, items={stack}}).time ~= 0 then
				return stack:get_count()
			else
				return 0
			end
		end
		return 0
	end,
	
	can_dig = function(pos,player)
		local meta = minetest.get_meta(pos)
		local inv = meta:get_inventory()
		return inv:is_empty("fuel")
	end,
})

-- Combined storage. Group 6 has both an inventory and a fuel store
minetest.register_node("digtron:combined_storage",
{
	description = "Digtron Combined Storage",
	groups = {cracky = 3,  oddly_breakable_by_hand=3, digtron = 6},
	drop = "digtron:combined_storage",
	sounds = digtron.metal_sounds,
	paramtype2= "facedir",
	is_ground_content = false,
	tiles = {"digtron_combined_storage.png"},

	on_construct = function(pos)
		local meta = minetest.get_meta(pos)
		meta:set_string("formspec", 
			"size[8,9.9]" ..
			default.gui_bg ..
			default.gui_bg_img ..
			default.gui_slots ..
			"label[0,0;Inventory items]" ..
			"list[current_name;main;0,0.6;8,3;]" ..
			"label[0,3.5;Fuel items]" ..
			"list[current_name;fuel;0,4.1;8,1;]" ..
			"list[current_player;main;0,5.75;8,1;]" ..
			"list[current_player;main;0,6.98;8,3;8]" ..
			"listring[current_name;fuel]" ..
			"listring[current_player;main]" ..
			default.get_hotbar_bg(0,5.75)
		)
		local inv = meta:get_inventory()
		inv:set_size("main", 8*3)
		inv:set_size("fuel", 8*1)
	end,
	
	-- Only allow fuel items to be placed in fuel
	allow_metadata_inventory_put = function(pos, listname, index, stack, player)
		if minetest.is_protected(pos, player:get_player_name()) then
			return 0
		end
		if listname == "fuel" then
			if minetest.get_craft_result({method="fuel", width=1, items={stack}}).time ~= 0 then
				return stack:get_count()
			else
				return 0
			end
		end
		return stack:get_count() -- otherwise, allow all drops
	end,
	
	allow_metadata_inventory_move = function(pos, from_list, from_index, to_list, to_index, count, player)
		if to_list == "main" then
			return count
		end
		
		local meta = minetest.get_meta(pos)
		local inv = meta:get_inventory()
		local stack = inv:get_stack(from_list, from_index)
		if minetest.get_craft_result({method="fuel", width=1, items={stack}}).time ~= 0 then
			return stack:get_count()
		end
		return 0
	end,
	
	can_dig = function(pos,player)
		local meta = minetest.get_meta(pos)
		local inv = meta:get_inventory()
		return inv:is_empty("fuel") and inv:is_empty("main")
	end,
})