local backpacks = {}

backpacks.form = "size[8,7]" ..
	default.gui_bg ..
	default.gui_bg_img ..
	default.gui_slots ..
	"list[current_name;main;0,0.3;8,2]" ..
	"list[current_player;main;0,2.85;8,1]" ..
	"list[current_player;main;0,4.08;8,3;8]" ..
	"listring[current_name;main]" ..
	"listring[current_player;main]"

backpacks.on_construct = function(pos)
	local meta = minetest.get_meta(pos)
	meta:set_string("infotext", "Backpack")
	meta:set_string("formspec", backpacks.form)
	local inv = meta:get_inventory()
	inv:set_size("main", 8*2)
end

backpacks.after_place_node = function(pos, placer, itemstack, pointed_thing)
	local meta = minetest.get_meta(pos)
	local stuff = minetest.deserialize(itemstack:get_metadata())
	if stuff then
		meta:from_table(stuff)
	end
	itemstack:take_item()
end

backpacks.on_dig = function(pos, node, digger)
	if minetest.is_protected(pos, digger:get_player_name()) then
		return false
	end
	local meta = minetest.get_meta(pos)
	local inv = meta:get_inventory()
	local list = {}
	for i, stack in ipairs(inv:get_list("main")) do
		if stack:get_name() == "" then
			list[i] = ""
		else 
			list[i] = stack:to_string()
		end
	end
	local new_list = {inventory = {main = list},
			fields = {infotext = "Backpack", formspec = backpacks.form}}
	local new_list_as_string = minetest.serialize(new_list)
	local new = ItemStack(node)
	new:set_metadata(new_list_as_string)
	minetest.remove_node(pos)
	local player_inv = digger:get_inventory()
	if player_inv:room_for_item("main", new) then
		player_inv:add_item("main", new)
	else
		minetest.add_item(pos, new)
	end
end

backpacks.allow_metadata_inventory_put = function(pos, listname, index, stack, player)
	if not string.match(stack:get_name(), "backpacks:backpack_") then
		return stack:get_count()
	else
		return 0
	end
end

-- Wool backpacks
local function register_wool_backpack(colour,colourname)
	minetest.register_node("backpacks:backpack_wool_"..colour, {
		description = colourname.." Wool Backpack",
		tiles = {
			"wool_"..colour..".png^backpacks_backpack_topbottom.png", -- Top
			"wool_"..colour..".png^backpacks_backpack_topbottom.png", -- Bottom
			"wool_"..colour..".png^backpacks_backpack_sides.png",     -- Right Side
			"wool_"..colour..".png^backpacks_backpack_sides.png",     -- Left Side
			"wool_"..colour..".png^backpacks_backpack_back.png",      -- Back
			"wool_"..colour..".png^backpacks_backpack_front.png"      -- Front
		},
		drawtype = "nodebox",
		paramtype = "light",
		paramtype2 = "facedir",
		node_box = {
			type = "fixed",
			fixed = {
				{-0.4375, -0.5, -0.375, 0.4375, 0.5, 0.375},
				{0.125, -0.375, 0.4375, 0.375, 0.3125, 0.5},
				{-0.375, -0.375, 0.4375, -0.125, 0.3125, 0.5},
				{0.125, 0.1875, 0.375, 0.375, 0.375, 0.4375},
				{-0.375, 0.1875, 0.375, -0.125, 0.375, 0.4375},
				{0.125, -0.375, 0.375, 0.375, -0.25, 0.4375},
				{-0.375, -0.375, 0.375, -0.125, -0.25, 0.4375},
				{-0.3125, -0.375, -0.4375, 0.3125, 0.1875, -0.375},
				{-0.25, -0.3125, -0.5, 0.25, 0.125, -0.4375},
			}
		},
		groups = {dig_immediate = 3, oddly_diggable_by_hand = 3, backpack = 1},
		stack_max = 1,
		on_construct = backpacks.on_construct,
		after_place_node = backpacks.after_place_node,
		on_dig = backpacks.on_dig,
		allow_metadata_inventory_put = backpacks.allow_metadata_inventory_put,
	})

	minetest.register_craft({
		output = "backpacks:backpack_wool_"..colour,
		recipe = {
			{"wool:"..colour, "wool:"..colour, "wool:"..colour},
			{"wool:"..colour, "",              "wool:"..colour},
			{"wool:"..colour, "wool:"..colour, "wool:"..colour},
		}
	})

end

minetest.register_craft({
	output = "backpacks:backpack_wool_brown",
	recipe = {
		{"group:wool", "group:wool", "group:wool"},
		{"group:wool", "",           "group:wool"},
		{"group:wool", "group:wool", "group:wool"},
	}
})

local wooldyes = {
        {code = "white",      name = "White"},
        {code = "grey",       name = "Grey"},
        {code = "black",      name = "Black"},
        {code = "red",        name = "Red"},
        {code = "yellow",     name = "Yellow"},
        {code = "green",      name = "Green"},
        {code = "cyan",       name = "Cyan"},
        {code = "blue",       name = "Blue"},
        {code = "magenta",    name = "Magenta"},
        {code = "orange",     name = "Orange"},
        {code = "violet",     name = "Violet"},
        {code = "brown",      name = "Brown"},
        {code = "pink",       name = "Pink"},
        {code = "dark_grey",  name = "Dark Grey"},
        {code = "dark_green", name = "Dark Green"},
}

for _,colourdesc in pairs(wooldyes) do
	register_wool_backpack(colourdesc.code,colourdesc.name)
end
minetest.register_alias("backpacks:backpack_wool", "backpacks:backpack_wool_brown")

-- Leather backpack
minetest.register_node("backpacks:backpack_leather", {
	description = "Leather Backpack",
	tiles = {
		"backpacks_leather.png^backpacks_backpack_topbottom.png", -- Top
		"backpacks_leather.png^backpacks_backpack_topbottom.png", -- Bottom
		"backpacks_leather.png^backpacks_backpack_sides.png",     -- Right Side
		"backpacks_leather.png^backpacks_backpack_sides.png",     -- Left Side
		"backpacks_leather.png^backpacks_backpack_back.png",      -- Back
		"backpacks_leather.png^backpacks_backpack_front.png"      -- Front
	},
	drawtype = "nodebox",
	paramtype = "light",
	paramtype2 = "facedir",
	node_box = {
		type = "fixed",
		fixed = {
			{-0.4375, -0.5, -0.375, 0.4375, 0.5, 0.375},
			{0.125, -0.375, 0.4375, 0.375, 0.3125, 0.5},
			{-0.375, -0.375, 0.4375, -0.125, 0.3125, 0.5},
			{0.125, 0.1875, 0.375, 0.375, 0.375, 0.4375},
			{-0.375, 0.1875, 0.375, -0.125, 0.375, 0.4375},
			{0.125, -0.375, 0.375, 0.375, -0.25, 0.4375},
			{-0.375, -0.375, 0.375, -0.125, -0.25, 0.4375},
			{-0.3125, -0.375, -0.4375, 0.3125, 0.1875, -0.375},
			{-0.25, -0.3125, -0.5, 0.25, 0.125, -0.4375},
		}
	},
	groups = {dig_immediate = 3, oddly_diggable_by_hand = 3, backpack = 1},
	stack_max = 1,
	on_construct = backpacks.on_construct,
	after_place_node = backpacks.after_place_node,
	on_dig = backpacks.on_dig,
	allow_metadata_inventory_put = backpacks.allow_metadata_inventory_put,
})

if minetest.global_exists("mobs") and ( mobs.redo or mobs.mod == 'redo') then
	minetest.register_craft({
		output = "backpacks:backpack_leather",
		recipe = {
			{"mobs:leather", "mobs:leather", "mobs:leather"},
			{"mobs:leather", "",             "mobs:leather"},
			{"mobs:leather", "mobs:leather", "mobs:leather"},
		}
	})
end