--
-- Formspecs
--

local function active_formspec(fuel_percent, item_percent)
	return "size[9,8.75]"..
	"background[-0.19,-0.25;9.41,9.49;crafting_inventory_furnace.png]"..
	mcl_vars.inventory_header..
	"list[current_player;main;0,4.5;9,3;9]"..
	"list[current_player;main;0,7.74;9,1;]"..
	"list[current_name;src;2.75,0.5;1,1;]"..
	"list[current_name;fuel;2.75,2.5;1,1;]"..
	"list[current_name;dst;5.75,1.5;1,1;]"..
	"image[2.75,1.5;1,1;default_furnace_fire_bg.png^[lowpart:"..
	(100-fuel_percent)..":default_furnace_fire_fg.png]"..
	"image[4.1,1.5;1.5,1;gui_furnace_arrow_bg.png^[lowpart:"..
	(item_percent)..":gui_furnace_arrow_fg.png^[transformR270]"..
	"image_button[8,0;1,1;craftguide_book.png;__mcl_craftguide;]"..
	"tooltip[__mcl_craftguide;Recipe book]"..
	"listring[current_name;dst]"..
	"listring[current_player;main]"..
	"listring[current_name;src]"..
	"listring[current_player;main]"..
	"listring[current_name;fuel]"..
	"listring[current_player;main]"
end

local inactive_formspec = "size[9,8.75]"..
	"background[-0.19,-0.25;9.41,9.49;crafting_inventory_furnace.png]"..
	mcl_vars.inventory_header..
	"list[current_player;main;0,4.5;9,3;9]"..
	"list[current_player;main;0,7.74;9,1;]"..
	"list[current_name;src;2.75,0.5;1,1;]"..
	"list[current_name;fuel;2.75,2.5;1,1;]"..
	"list[current_name;dst;5.75,1.5;1,1;]"..
	"image[2.75,1.5;1,1;default_furnace_fire_bg.png]"..
	"image[4.1,1.5;1.5,1;gui_furnace_arrow_bg.png^[transformR270]"..
	"image_button[8,0;1,1;craftguide_book.png;__mcl_craftguide;]"..
	"tooltip[__mcl_craftguide;Recipe book]"..
	"listring[current_name;dst]"..
	"listring[current_player;main]"..
	"listring[current_name;src]"..
	"listring[current_player;main]"..
	"listring[current_name;fuel]"..
	"listring[current_player;main]"

local craftguide = function(pos, formname, fields, sender)
	if fields.__mcl_craftguide then
		mcl_craftguide.show_craftguide(sender)
	end
end

--
-- Node callback functions that are the same for active and inactive furnace
--

local function allow_metadata_inventory_put(pos, listname, index, stack, player)
	if minetest.is_protected(pos, player:get_player_name()) then
		return 0
	end
	local meta = minetest.get_meta(pos)
	local inv = meta:get_inventory()
	if listname == "fuel" then
		-- Special case: empty bucket (not a fuel, but used for sponge drying)
		if stack:get_name() == "bucket:bucket_empty" then
			if inv:get_stack(listname, index):get_count() == 0 then
				return 1
			else
				return 0
			end
		end

		-- Test stack with size 1 because we burn one fuel at a time
		local teststack = ItemStack(stack)
		teststack:set_count(1)
		local output, decremented_input = minetest.get_craft_result({method="fuel", width=1, items={teststack}})
		if output.time ~= 0 then
			-- Only allow to place 1 item if fuel get replaced by recipe.
			-- This is the case for lava buckets.
			local replace_item = decremented_input.items[1]
			if replace_item:is_empty() then
				-- For most fuels, just allow to place everything
				return stack:get_count()
			else
				if inv:get_stack(listname, index):get_count() == 0 then
					return 1
				else
					return 0
				end
			end
		else
			return 0
		end
	elseif listname == "src" then
		return stack:get_count()
	elseif listname == "dst" then
		return 0
	end
end

local function allow_metadata_inventory_move(pos, from_list, from_index, to_list, to_index, count, player)
	local meta = minetest.get_meta(pos)
	local inv = meta:get_inventory()
	local stack = inv:get_stack(from_list, from_index)
	return allow_metadata_inventory_put(pos, to_list, to_index, stack, player)
end

local function allow_metadata_inventory_take(pos, listname, index, stack, player)
	if minetest.is_protected(pos, player:get_player_name()) then
		return 0
	end
	return stack:get_count()
end

local function on_metadata_inventory_take(pos, listname, index, stack, player)
	-- Award smelting achievements
	if listname == "dst" then
		if stack:get_name() == "mcl_core:iron_ingot" then
			awards.unlock(player:get_player_name(), "mcl:acquireIron")
		elseif stack:get_name() == "mcl_fishing:fish_cooked" then
			awards.unlock(player:get_player_name(), "mcl:cookFish")
		end
	end
end

local function swap_node(pos, name)
	local node = minetest.get_node(pos)
	if node.name == name then
		return
	end
	node.name = name
	minetest.swap_node(pos, node)
end

local function furnace_node_timer(pos, elapsed)
	--
	-- Inizialize metadata
	--
	local meta = minetest.get_meta(pos)
	local fuel_time = meta:get_float("fuel_time") or 0
	local src_time = meta:get_float("src_time") or 0
	local src_item = meta:get_string("src_item") or ""
	local fuel_totaltime = meta:get_float("fuel_totaltime") or 0

	local inv = meta:get_inventory()
	local srclist, fuellist

	local cookable, cooked
	local fuel

	local update = true
	while update do
		update = false

		srclist = inv:get_list("src")
		fuellist = inv:get_list("fuel")

		--
		-- Cooking
		--

		-- Check if we have cookable content
		local aftercooked
		cooked, aftercooked = minetest.get_craft_result({method = "cooking", width = 1, items = srclist})
		cookable = cooked.time ~= 0

		-- Check if src item has been changed
		if srclist[1]:get_name() ~= src_item then
			-- Reset cooking progress in this case
			src_time = 0
			src_item = srclist[1]:get_name()
			update = true

		-- Check if we have enough fuel to burn
		elseif fuel_time < fuel_totaltime then
			-- The furnace is currently active and has enough fuel
			fuel_time = fuel_time + elapsed
			-- If there is a cookable item then check if it is ready yet
			if cookable then
				src_time = src_time + elapsed
				if src_time >= cooked.time then
					-- Place result in dst list if possible
					if inv:room_for_item("dst", cooked.item) then
						inv:add_item("dst", cooked.item)
						inv:set_stack("src", 1, aftercooked.items[1])
						src_time = src_time - cooked.time
						update = true

						-- Unique recipe: Put water into empty bucket after cooking wet sponge
						if srclist[1]:get_name() == "mcl_sponges:sponge_wet" then
							if inv:get_stack("fuel", 1):get_name() == "bucket:bucket_empty" then
								inv:set_stack("fuel", 1, "bucket:bucket_water")
							end
						end
					end
				end
			end
		else
			-- Furnace ran out of fuel
			if cookable then
				-- We need to get new fuel
				local afterfuel
				fuel, afterfuel = minetest.get_craft_result({method = "fuel", width = 1, items = fuellist})

				if fuel.time == 0 then
					-- No valid fuel in fuel list
					fuel_totaltime = 0
					src_time = 0
				else
					-- Take fuel from fuel list
					inv:set_stack("fuel", 1, afterfuel.items[1])
					update = true
					fuel_totaltime = fuel.time + (fuel_time - fuel_totaltime)
					src_time = src_time + elapsed
				end
			else
				-- We don't need to get new fuel since there is no cookable item
				fuel_totaltime = 0
				src_time = 0
			end
			fuel_time = 0
		end

		elapsed = 0
	end

	if fuel and fuel_totaltime > fuel.time then
		fuel_totaltime = fuel.time
	end
	if srclist[1]:is_empty() then
		src_time = 0
	end

	--
	-- Update formspec and node
	--
	local formspec = inactive_formspec
	local item_state
	local item_percent = 0
	if cookable then
		item_percent = math.floor(src_time / cooked.time * 100)
	end

	local result = false

	if fuel_totaltime ~= 0 then
		local fuel_percent = math.floor(fuel_time / fuel_totaltime * 100)
		formspec = active_formspec(fuel_percent, item_percent)
		swap_node(pos, "mcl_furnaces:furnace_active")
		-- make sure timer restarts automatically
		result = true
	else
		swap_node(pos, "mcl_furnaces:furnace")
		-- stop timer on the inactive furnace
		minetest.get_node_timer(pos):stop()
	end

	--
	-- Set meta values
	--
	meta:set_float("fuel_totaltime", fuel_totaltime)
	meta:set_float("fuel_time", fuel_time)
	meta:set_float("src_time", src_time)
	meta:set_string("src_item", srclist[1]:get_name())
	meta:set_string("formspec", formspec)

	return result
end

minetest.register_node("mcl_furnaces:furnace", {
	description = "Furnace",
	_doc_items_longdesc = "Furnaces cook or smelt several items, using a furnace fuel, into something else.",
	_doc_items_usagehelp =  "Right-click the furnace to view it. Place a furnace fuel in the lower slot and the source material in the upper slot. The furnace will slowly use its fuel to smelt the item. The result will be placed into the output slot at the right side.",
	_doc_items_hidden = false,
	tiles = {
		"default_furnace_top.png", "default_furnace_bottom.png",
		"default_furnace_side.png", "default_furnace_side.png",
		"default_furnace_side.png", "default_furnace_front.png"
	},
	paramtype2 = "facedir",
	groups = {pickaxey=1, container=4, deco_block=1, material_stone=1},
	is_ground_content = false,
	sounds = mcl_sounds.node_sound_stone_defaults(),

	on_timer = furnace_node_timer,
	after_dig_node = function(pos, oldnode, oldmetadata, digger)
		local meta = minetest.get_meta(pos)
		local meta2 = meta
		meta:from_table(oldmetadata)
		local inv = meta:get_inventory()
		for _, listname in ipairs({"src", "dst", "fuel"}) do
			local stack = inv:get_stack(listname, 1)
			if not stack:is_empty() then
				local p = {x=pos.x+math.random(0, 10)/10-0.5, y=pos.y, z=pos.z+math.random(0, 10)/10-0.5}
				minetest.add_item(p, stack)
			end
		end
		meta:from_table(meta2:to_table())
	end,

	on_construct = function(pos)
		local meta = minetest.get_meta(pos)
		meta:set_string("formspec", inactive_formspec)
		local inv = meta:get_inventory()
		inv:set_size('src', 1)
		inv:set_size('fuel', 1)
		inv:set_size('dst', 1)
	end,

	on_metadata_inventory_move = function(pos)
		minetest.get_node_timer(pos):start(1.0)
	end,
	on_metadata_inventory_put = function(pos)
		-- start timer function, it will sort out whether furnace can burn or not.
		minetest.get_node_timer(pos):start(1.0)
	end,

	allow_metadata_inventory_put = allow_metadata_inventory_put,
	allow_metadata_inventory_move = allow_metadata_inventory_move,
	allow_metadata_inventory_take = allow_metadata_inventory_take,
	on_metadata_inventory_take = on_metadata_inventory_take,
	on_receive_fields = craftguide,
	_mcl_blast_resistance = 17.5,
	_mcl_hardness = 3.5,
})

minetest.register_node("mcl_furnaces:furnace_active", {
	description = "Burning Furnace",
	_doc_items_create_entry = false,
	tiles = {
		"default_furnace_top.png", "default_furnace_bottom.png",
		"default_furnace_side.png", "default_furnace_side.png",
		"default_furnace_side.png", "default_furnace_front_active.png",
	},
	paramtype2 = "facedir",
	light_source = 13,
	drop = "mcl_furnaces:furnace",
	groups = {pickaxey=1, container=4, deco_block=1, not_in_creative_inventory=1, material_stone=1},
	is_ground_content = false,
	sounds = mcl_sounds.node_sound_stone_defaults(),
	on_timer = furnace_node_timer,

	after_dig_node = function(pos, oldnode, oldmetadata, digger)
		local meta = minetest.get_meta(pos)
		local meta2 = meta
		meta:from_table(oldmetadata)
		local inv = meta:get_inventory()
		for _, listname in ipairs({"src", "dst", "fuel"}) do
			local stack = inv:get_stack(listname, 1)
			if not stack:is_empty() then
				local p = {x=pos.x+math.random(0, 10)/10-0.5, y=pos.y, z=pos.z+math.random(0, 10)/10-0.5}
				minetest.add_item(p, stack)
			end
		end
		meta:from_table(meta2:to_table())
	end,


	allow_metadata_inventory_put = allow_metadata_inventory_put,
	allow_metadata_inventory_move = allow_metadata_inventory_move,
	allow_metadata_inventory_take = allow_metadata_inventory_take,
	on_metadata_inventory_take = on_metadata_inventory_take,
	on_receive_fields = craftguide,
	_mcl_blast_resistance = 17.5,
	_mcl_hardness = 3.5,
})

minetest.register_craft({
	output = "mcl_furnaces:furnace",
	recipe = {
		{ "mcl_core:cobble", "mcl_core:cobble", "mcl_core:cobble" },
		{ "mcl_core:cobble", "", "mcl_core:cobble" },
		{ "mcl_core:cobble", "mcl_core:cobble", "mcl_core:cobble" },
	}
})

-- Add entry alias for the Help
if minetest.get_modpath("doc") then
	doc.add_entry_alias("nodes", "mcl_furnaces:furnace", "nodes", "mcl_furnaces:furnace_active")
end