local S = minetest.get_translator(minetest.get_current_modname())

local MAX_WEAR = 65535

local function get_grindstone_formspec()
	return "size[9,8.75]"..
	"image[3,1.5;1.5,1;gui_crafting_arrow.png]"..
	"label[0,4.0;"..minetest.formspec_escape(minetest.colorize("#313131", S("Inventory"))).."]"..
	"label[1,0.1;"..minetest.formspec_escape(minetest.colorize("#313131", S("Repair & Disenchant"))).."]"..
	"list[context;main;0,0;8,4;]"..
	"list[current_player;main;0,4.5;9,3;9]"..
	mcl_formspec.get_itemslot_bg(0,4.5,9,3)..
	"list[current_player;main;0,7.74;9,1;]"..
	mcl_formspec.get_itemslot_bg(0,7.74,9,1)..
	"list[context;input;1,1;1,1;]"..
	mcl_formspec.get_itemslot_bg(1,1,1,1)..
	"list[context;input;1,2;1,1;1]"..
	mcl_formspec.get_itemslot_bg(1,2,1,1)..
	"list[context;output;6,1.5;1,1;]"..
	mcl_formspec.get_itemslot_bg(6,1.5,1,1)..
	"listring[context;output]"..
	"listring[current_player;main]"..
	"listring[context;input]"..
	"listring[current_player;main]"
end

-- Helper function to make sure update_anvil_slots NEVER overstacks the output slot
local function fix_stack_size(stack)
	if not stack or stack == "" then return "" end
	local count = stack:get_count()
	local max_count = stack:get_stack_max()

	if count > max_count then
		stack:set_count(max_count)
		count = max_count
	end
	return count
end

local function update_grindstone_slots(meta)
	local inv = meta:get_inventory()
	local input1 = inv:get_stack("input", 1)
	local input2 = inv:get_stack("input", 2)

	local new_output

	if (not input1:is_empty() and not input2:is_empty()) then
		-- Repair, if tool
		local def1 = input1:get_definition()
		local def2 = input2:get_definition()
		local name1 = input1:get_name()
		local name2 = input2:get_name()

		local function calculate_repair(dur1, dur2)
			local new_durability = (MAX_WEAR - dur1) + (MAX_WEAR - dur2) * 1.05
			return math.max(0, math.min(MAX_WEAR, MAX_WEAR - new_durability))
		end

		if def1.type == "tool" and def2.type == "tool" and name1 == name2 then
			local new_wear = calculate_repair(input1:get_wear(), input2:get_wear())
			input1:set_wear(new_wear)
			new_output = input1
		else
			new_output = ""
		end
	else
		new_output = ""
	end

	-- Set the new output slot
	if new_output then
		fix_stack_size(new_output)
		inv:set_stack("output", 1, new_output)
	end
end

minetest.register_node("mcl_grindstone:grindstone", {
	description = S("Grindstone"),
	_tt_help = S("Used to disenchant/fix tools"),
	_doc_items_longdesc = S("This is currently a decorative block which serves as the weapon smith's work station.  In minecraft this is used to disenchant/fix tools howerver this has not yet been implemented"),
	tiles = {
		"grindstone_top.png",
		"grindstone_top.png",
		"grindstone_side.png",
		"grindstone_side.png",
		"grindstone_front.png",
		"grindstone_front.png"
	},
	drawtype = "nodebox",
	paramtype2 = "facedir",
	node_box = {
		type = "fixed",
		-- created with nodebox editor
		fixed = {
			{-0.25, -0.25, -0.375, 0.25, 0.5, 0.375},
			{-0.375, -0.0625, -0.1875, -0.25, 0.3125, 0.1875},
			{0.25, -0.0625, -0.1875, 0.375, 0.3125, 0.1875},
			{0.25, -0.5, -0.125, 0.375, -0.0625, 0.125},
			{-0.375, -0.5, -0.125, -0.25, -0.0625, 0.125},
		}
	},
	selection_box = node_box,
	groups = {pickaxey = 1, deco_block = 1},

	allow_metadata_inventory_take = function(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
		else
			return stack:get_count()
		end
	end,
	allow_metadata_inventory_put = function(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
		elseif listname == "output" then
			return 0
		else
			return stack:get_count()
		end
	end,
	allow_metadata_inventory_move = function(pos, from_list, from_index, to_list, to_index, count, player)
		local name = player:get_player_name()
		if minetest.is_protected(pos, name) then
			minetest.record_protection_violation(pos, name)
			return 0
		elseif to_list == "output" then
			return 0
		elseif from_list == "output" and to_list == "input" then
			local meta = minetest.get_meta(pos)
			local inv = meta:get_inventory()
			if inv:get_stack(to_list, to_index):is_empty() then
				return count
			else
				return 0
			end
		else
			return count
		end
	end,

	on_metadata_inventory_put = function(pos, listname, index, stack, player)
		local meta = minetest.get_meta(pos)
		update_grindstone_slots(meta)
	end,

	on_metadata_inventory_move = function(pos, from_list, from_index, to_list, to_index, count, player)
		local meta = minetest.get_meta(pos)
		if from_list == "output" and to_list == "input" then
			local inv = meta:get_inventory()
			for i=1, inv:get_size("input") do
				if i ~= to_index then
					local istack = inv:get_stack("input", i)
					istack:set_count(math.max(0, istack:get_count() - count))
					inv:set_stack("input", i, istack)
				end
			end
		end
		update_grindstone_slots(meta)
	end,
	on_metadata_inventory_take = function(pos, listname, index, stack, player)
		local meta = minetest.get_meta(pos)
		if listname == "output" then
			local inv = meta:get_inventory()
			local input1 = inv:get_stack("input", 1)
			local input2 = inv:get_stack("input", 2)
			-- Both slots occupied?
			if not input1:is_empty() and not input2:is_empty() then
				input1:take_item()
				input2:take_item()
				inv:set_stack("input", 1, input1)
				inv:set_stack("input", 2, input2)
			else
				if not input1:is_empty() then
					input1:set_count(math.max(0, input1:get_count() - stack:get_count()))
					inv:set_stack("input", 1, input1)
				end
				if not input2:is_empty() then
					input2:set_count(math.max(0, input2:get_count() - stack:get_count()))
					inv:set_stack("input", 2, input2)
				end
			end
		elseif listname == "input" then
			update_grindstone_slots(meta)
		end
	end,

	on_construct = function(pos)
		local meta = minetest.get_meta(pos)
		local inv = meta:get_inventory()
		inv:set_size("input", 2)
		inv:set_size("output", 1)
		local form = get_grindstone_formspec()
		meta:set_string("formspec", form)
	end,
	on_rightclick = function(pos, node, player, itemstack)
		if not player:get_player_control().sneak then
			local meta = minetest.get_meta(pos)
			update_grindstone_slots(meta)
			meta:set_string("formspec", get_grindstone_formspec())
		end
	end,
	_mcl_blast_resistance = 6,
	_mcl_hardness = 2
})

minetest.register_craft({
	output = "mcl_grindstone:grindstone",
	recipe = {
		{ "mcl_core:stick", "mcl_stairs:slab_stone_rough", "mcl_core:stick"},
		{ "group:wood", "", "group:wood"},
	}
})