local S = minetest.get_translator(minetest.get_current_modname())
local C = minetest.colorize
local F = minetest.formspec_escape

local LIGHT_ACTIVE_FURNACE = 13

--
-- Formspecs
--

local function active_formspec(fuel_percent, item_percent)
	return table.concat({
		"formspec_version[4]",
		"size[11.75,10.425]",
		"label[0.375,0.375;" .. F(C(mcl_formspec.label_color, S("Blast Furnace"))) .. "]",
		mcl_formspec.get_itemslot_bg_v4(3.5, 0.75, 1, 1),
		"list[context;src;3.5,0.75;1,1;]",

		"image[3.5,2;1,1;default_furnace_fire_bg.png^[lowpart:" ..
		(100 - fuel_percent) .. ":default_furnace_fire_fg.png]",

		mcl_formspec.get_itemslot_bg_v4(3.5, 3.25, 1, 1),
		"list[context;fuel;3.5,3.25;1,1;]",

		"image[5.25,2;1.5,1;gui_furnace_arrow_bg.png^[lowpart:" ..
		(item_percent) .. ":gui_furnace_arrow_fg.png^[transformR270]",
		mcl_formspec.get_itemslot_bg_v4(7.875, 2, 1, 1, 0.2),
		"list[context;dst;7.875,2;1,1;]",

		"label[0.375,4.7;" .. F(C(mcl_formspec.label_color, S("Inventory"))) .. "]",
		mcl_formspec.get_itemslot_bg_v4(0.375, 5.1, 9, 3),
		"list[current_player;main;0.375,5.1;9,3;9]",

		mcl_formspec.get_itemslot_bg_v4(0.375, 9.05, 9, 1),
		"list[current_player;main;0.375,9.05;9,1;]",

		-- Craft guide button temporarily removed due to Minetest bug.
		-- TODO: Add it back when the Minetest bug is fixed.
		--"image_button[8,0;1,1;craftguide_book.png;craftguide;]"..
		--"tooltip[craftguide;"..minetest.formspec_escape(S("Recipe book")).."]"..

		"listring[context;dst]",
		"listring[current_player;main]",
		"listring[context;src]",
		"listring[current_player;main]",
		"listring[context;fuel]",
		"listring[current_player;main]",
	})
end

local inactive_formspec = table.concat({
	"formspec_version[4]",
	"size[11.75,10.425]",
	"label[0.375,0.375;" .. F(C(mcl_formspec.label_color, S("Blast Furnace"))) .. "]",
	mcl_formspec.get_itemslot_bg_v4(3.5, 0.75, 1, 1),
	"list[context;src;3.5,0.75;1,1;]",

	"image[3.5,2;1,1;default_furnace_fire_bg.png]",

	mcl_formspec.get_itemslot_bg_v4(3.5, 3.25, 1, 1),
	"list[context;fuel;3.5,3.25;1,1;]",

	"image[5.25,2;1.5,1;gui_furnace_arrow_bg.png^[transformR270]",

	mcl_formspec.get_itemslot_bg_v4(7.875, 2, 1, 1, 0.2),
	"list[context;dst;7.875,2;1,1;]",

	"label[0.375,4.7;" .. F(C(mcl_formspec.label_color, S("Inventory"))) .. "]",
	mcl_formspec.get_itemslot_bg_v4(0.375, 5.1, 9, 3),
	"list[current_player;main;0.375,5.1;9,3;9]",

	mcl_formspec.get_itemslot_bg_v4(0.375, 9.05, 9, 1),
	"list[current_player;main;0.375,9.05;9,1;]",

	-- Craft guide button temporarily removed due to Minetest bug.
	-- TODO: Add it back when the Minetest bug is fixed.
	--"image_button[8,0;1,1;craftguide_book.png;craftguide;]"..
	--"tooltip[craftguide;"..minetest.formspec_escape(S("Recipe book")).."]"..

	"listring[context;dst]",
	"listring[current_player;main]",
	"listring[context;src]",
	"listring[current_player;main]",
	"listring[context;fuel]",
	"listring[current_player;main]",
})


local receive_fields = function(pos, formname, fields, sender)
	if fields.craftguide then
		mcl_craftguide.show(sender:get_player_name())
	end
end

local function give_xp(pos, player)
	local meta = minetest.get_meta(pos)
	local dir = vector.divide(minetest.facedir_to_dir(minetest.get_node(pos).param2), -1.95)
	local xp = meta:get_int("xp")
	if xp > 0 then
		if player then
			mcl_experience.add_xp(player, xp)
		else
			mcl_experience.throw_xp(vector.add(pos, dir), xp)
		end
		meta:set_int("xp", 0)
	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)
	local name = player:get_player_name()
	if minetest.is_protected(pos, name) then
		minetest.record_protection_violation(pos, name)
		return 0
	end
	local meta = minetest.get_meta(pos)
	local inv = meta:get_inventory()
	if listname == "fuel" then
		-- 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)
	local name = player:get_player_name()
	if minetest.is_protected(pos, name) then
		minetest.record_protection_violation(pos, name)
		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")
		end
		give_xp(pos, player)
	end
end

local function on_metadata_inventory_move(pos, from_list, from_index, to_list, to_index, count, player)
	if from_list == "dst" then
		give_xp(pos, player)
	end
end

local function spawn_flames(pos, param2)
	local minrelpos, maxrelpos
	local dir = minetest.facedir_to_dir(param2)
	if dir.x > 0 then
		minrelpos = vector.new(-0.6, -0.05, -0.25)
		maxrelpos = vector.new(-0.55, -0.45, 0.25)
	elseif dir.x < 0 then
		minrelpos = vector.new(0.55, -0.05, -0.25)
		maxrelpos = vector.new(0.6, -0.45, 0.25)
	elseif dir.z > 0 then
		minrelpos = vector.new(-0.25, -0.05, -0.6)
		maxrelpos = vector.new(0.25, 0.45, -0.55)
	elseif dir.z < 0 then
		minrelpos = vector.new(-0.25, -0.05, 0.55)
		maxrelpos = vector.new(0.25, -0.45, 0.6)
	else
		return
	end
	mcl_particles.add_node_particlespawner(pos, {
		amount = 4,
		time = 0,
		minpos = vector.add(pos, minrelpos),
		maxpos = vector.add(pos, maxrelpos),
		minvel = vector.new(-0.01, 0, -0.01),
		maxvel = vector.new(0.01, 0.1, 0.01),
		minexptime = 0.3,
		maxexptime = 0.6,
		minsize = 0.4,
		maxsize = 0.8,
		texture = "mcl_particles_flame.png",
		glow = LIGHT_ACTIVE_FURNACE,
	}, "low")
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)
	if name == "mcl_blast_furnace:blast_furnace_active" then
		spawn_flames(pos, node.param2)
	else
		mcl_particles.delete_node_particlespawners(pos)
	end
end

local function blast_furnace_reset_delta_time(pos)
	local meta = minetest.get_meta(pos)
	local time_speed = tonumber(minetest.settings:get("time_speed") or 72)
	if (time_speed < 0.1) then
		return
	end
	local time_multiplier = 86400 / time_speed
	local current_game_time = .0 + ((minetest.get_day_count() + minetest.get_timeofday()) * time_multiplier)

	-- TODO: Change meta:get/set_string() to get/set_float() for "last_gametime".
	-- In Windows *_float() works OK but under Linux it returns rounded unusable values like 449540.000000000
	local last_game_time = meta:get_string("last_gametime")
	if last_game_time then
		last_game_time = tonumber(last_game_time)
	end
	if not last_game_time or last_game_time < 1 or math.abs(last_game_time - current_game_time) <= 1.5 then
		return
	end

	meta:set_string("last_gametime", tostring(current_game_time))
end

local function blast_furnace_get_delta_time(pos, elapsed)
	local meta = minetest.get_meta(pos)
	local time_speed = tonumber(minetest.settings:get("time_speed") or 72)
	local current_game_time
	if (time_speed < 0.1) then
		return meta, elapsed
	else
		local time_multiplier = 86400 / time_speed
		current_game_time = .0 + ((minetest.get_day_count() + minetest.get_timeofday()) * time_multiplier)
	end

	local last_game_time = meta:get_string("last_gametime")
	if last_game_time then
		last_game_time = tonumber(last_game_time)
	end
	if not last_game_time or last_game_time < 1 then
		last_game_time = current_game_time - 0.1
	elseif last_game_time == current_game_time then
		current_game_time = current_game_time + 1.0
	end

	local elapsed_game_time = .0 + current_game_time - last_game_time

	meta:set_string("last_gametime", tostring(current_game_time))

	return meta, elapsed_game_time
end

local function blast_furnace_node_timer(pos, elapsed)
	--
	-- Inizialize metadata
	--
	local meta, elapsed_game_time = blast_furnace_get_delta_time(pos, elapsed)

	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 active = true
	local fuel

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

	-- 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()
	end

	local update = true
	while elapsed_game_time > 0.00001 and update do
		--
		-- Cooking
		--

		-- Run the blast_furnace at twice the speed of a furnace.
		local el = elapsed_game_time * 2

		-- Check if we have cookable content: cookable
		local aftercooked
		cooked, aftercooked = minetest.get_craft_result({ method = "cooking", width = 1, items = srclist })
		cookable = minetest.get_item_group(inv:get_stack("src", 1):get_name(), "blast_furnace_smeltable") == 1
		if cookable then
			-- Successful cooking requires space in dst slot and time
			if not inv:room_for_item("dst", cooked.item) then
				cookable = false
			end
		end

		if cookable then -- fuel lasts long enough, adjust el to cooking duration
			el = math.min(el, cooked.time - src_time)
		end

		-- Check if we have enough fuel to burn
		active = fuel_time < fuel_totaltime
		if cookable and not active 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 -- stop
				fuel_totaltime = 0
				src_time = 0
				update = false
			else
				-- Take fuel from fuel list
				inv:set_stack("fuel", 1, afterfuel.items[1])
				fuel_time = 0
				fuel_totaltime = fuel.time
				el = math.min(el, fuel_totaltime)
				active = true
				fuellist = inv:get_list("fuel")
			end
		elseif active then
			el = math.min(el, fuel_totaltime - fuel_time)
			-- The furnace is currently active and has enough fuel
			fuel_time = fuel_time + el
		end

		-- If there is a cookable item then check if it is ready yet
		if cookable and active then
			src_time = src_time + el
			-- Place result in dst list if done
			if src_time >= cooked.time then
				inv:add_item("dst", cooked.item)
				inv:set_stack("src", 1, aftercooked.items[1])
				srclist = inv:get_list("src")
				src_time = 0

				meta:set_int("xp", meta:get_int("xp") + 1) -- ToDo give each recipe an idividial XP count
			end
		end

		elapsed_game_time = elapsed_game_time - el
	end

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

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

	local result = false

	if active then
		local fuel_percent = 0
		if fuel_totaltime > 0 then
			fuel_percent = math.floor(fuel_time / fuel_totaltime * 100)
		end
		formspec = active_formspec(fuel_percent, item_percent)
		swap_node(pos, "mcl_blast_furnace:blast_furnace_active")
		-- make sure timer restarts automatically
		result = true
	else
		swap_node(pos, "mcl_blast_furnace:blast_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)
	if srclist then
		meta:set_string("src_item", src_item)
	else
		meta:set_string("src_item", "")
	end
	meta:set_string("formspec", formspec)

	return result
end

local on_rotate, after_rotate_active
if minetest.get_modpath("screwdriver") then
	on_rotate = screwdriver.rotate_simple
	after_rotate_active = function(pos)
		local node = minetest.get_node(pos)
		mcl_particles.delete_node_particlespawners(pos)
		if node.name == "mcl_blast_furnace:blast_furnace" then
			return
		end
		spawn_flames(pos, node.param2)
	end
end

minetest.register_node("mcl_blast_furnace:blast_furnace", {
	description = S("Blast Furnace"),
	tiles = {
		"blast_furnace_top.png", "blast_furnace_top.png",
		"blast_furnace_side.png", "blast_furnace_side.png",
		"blast_furnace_side.png", "blast_furnace_front.png"
	},
	paramtype2 = "facedir",
	groups = { pickaxey = 1, container = 2, deco_block = 1, material_stone = 1 },
	is_ground_content = false,
	sounds = mcl_sounds.node_sound_stone_defaults(),

	on_timer = blast_furnace_node_timer,
	after_dig_node = function(pos, oldnode, oldmetadata, digger)
		local meta = minetest.get_meta(pos)
		local meta2 = meta:to_table()
		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
				minetest.add_item(vector.offset(pos, math.random(0, 10) / 10 - 0.5, 0, math.random(0, 10) / 10 - 0.5), stack)
			end
		end
		meta:from_table(meta2)
	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_destruct = function(pos)
		mcl_particles.delete_node_particlespawners(pos)
		give_xp(pos)
	end,

	on_metadata_inventory_move = function(pos, from_list, from_index, to_list, to_index, count, player)
		-- Reset accumulated game time when player works with furnace:
		blast_furnace_reset_delta_time(pos)
		minetest.get_node_timer(pos):start(1.0)

		on_metadata_inventory_move(pos, from_list, from_index, to_list, to_index, count, player)
	end,
	on_metadata_inventory_put = function(pos)
		-- Reset accumulated game time when player works with furnace:
		blast_furnace_reset_delta_time(pos)
		-- start timer function, it will sort out whether furnace can burn or not.
		minetest.get_node_timer(pos):start(1.0)
	end,
	on_metadata_inventory_take = function(pos, listname, index, stack, player)
		-- Reset accumulated game time when player works with furnace:
		blast_furnace_reset_delta_time(pos)
		-- start timer function, it will helpful if player clears dst slot
		minetest.get_node_timer(pos):start(1.0)

		on_metadata_inventory_take(pos, listname, index, stack, player)
	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_receive_fields = receive_fields,
	_mcl_blast_resistance = 3.5,
	_mcl_hardness = 3.5,
	on_rotate = on_rotate,
	_mcl_hoppers_on_try_pull = mcl_furnaces.hoppers_on_try_pull,
	_mcl_hoppers_on_try_push = mcl_furnaces.hoppers_on_try_push,
	_mcl_hoppers_on_after_push = function(pos)
		minetest.get_node_timer(pos):start(1.0)
	end,
})

minetest.register_node("mcl_blast_furnace:blast_furnace_active", {
	description = S("Burning Blast Furnace"),
	tiles = {
		"blast_furnace_top.png", "blast_furnace_top.png",
		"blast_furnace_side.png", "blast_furnace_side.png",
		"blast_furnace_side.png", {
		name = "blast_furnace_front_on.png",
		animation = { type = "vertical_frames", aspect_w = 16, aspect_h = 16, length = 48 }
	},
	},
	paramtype2 = "facedir",
	paramtype = "light",
	light_source = LIGHT_ACTIVE_FURNACE,
	drop = "mcl_blast_furnace:blast_furnace",
	groups = { pickaxey = 1, container = 2, deco_block = 1, not_in_creative_inventory = 1, material_stone = 1 },
	is_ground_content = false,
	sounds = mcl_sounds.node_sound_stone_defaults(),
	on_timer = blast_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 = vector.new(
					pos.x + math.random(0, 10) / 10 - 0.5,
					pos.y,
					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 node = minetest.get_node(pos)
		spawn_flames(pos, node.param2)
	end,
	on_destruct = function(pos)
		mcl_particles.delete_node_particlespawners(pos)
		give_xp(pos)
	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_move = on_metadata_inventory_move,
	on_metadata_inventory_take = on_metadata_inventory_take,
	on_receive_fields = receive_fields,
	_mcl_blast_resistance = 3.5,
	_mcl_hardness = 3.5,
	on_rotate = on_rotate,
	after_rotate = after_rotate_active,
	_mcl_hoppers_on_try_pull = mcl_furnaces.hoppers_on_try_pull,
	_mcl_hoppers_on_try_push = mcl_furnaces.hoppers_on_try_push,
})

minetest.register_craft({
	output = "mcl_blast_furnace:blast_furnace",
	recipe = {
		{ "mcl_core:iron_ingot",   "mcl_core:iron_ingot",   "mcl_core:iron_ingot" },
		{ "mcl_core:iron_ingot",   "mcl_furnaces:furnace",  "mcl_core:iron_ingot" },
		{ "mcl_core:stone_smooth", "mcl_core:stone_smooth", "mcl_core:stone_smooth" },
	}
})

minetest.register_lbm({
	label = "Active blast_furnace flame particles",
	name = "mcl_blast_furnace:flames",
	nodenames = { "mcl_blast_furnace:blast_furnace_active" },
	run_at_every_load = true,
	action = function(pos, node)
		spawn_flames(pos, node.param2)
	end,
})