-- The electric generator.
-- A simple device to get started on the electric machines.
-- Inefficient and expensive in fuel (200EU per tick)
-- Also only allows for LV machinery to run.

minetest.register_alias("generator", "technic:generator")
minetest.register_alias("generator", "technic:generator_active")

minetest.register_craft({
	output = 'technic:generator',
	recipe = {
		{'default:stone', 'default:stone',        'default:stone'},
		{'default:stone', '',                     'default:stone'},
		{'default:stone', 'default:copper_ingot', 'default:stone'},
	}
})

local generator_formspec =
	"invsize[8,9;]"..
	"label[0,0;Generator]"..
	"list[current_name;src;3,1;1,1;]"..
	"image[4,1;1,1;default_furnace_fire_bg.png]"..
	"list[current_player;main;0,5;8,4;]"
	

minetest.register_node("technic:generator", {
	description = "Electric Generator",
	tiles = {"technic_generator_top.png", "technic_machine_bottom.png", "technic_generator_side.png",
	         "technic_generator_side.png", "technic_generator_side.png", "technic_generator_front.png"},
	paramtype2 = "facedir",
	groups = {snappy=2, choppy=2, oddly_breakable_by_hand=2},
	legacy_facedir_simple = true,
	sounds = default.node_sound_wood_defaults(),
	on_construct = function(pos)
		local meta = minetest.get_meta(pos)
		meta:set_string("infotext", "Electric Generator")
		meta:set_int("LV_EU_supply", 0)
		-- Signal to the switching station that this device burns some
		-- sort of fuel and needs special handling
		meta:set_int("LV_EU_from_fuel", 1)
		meta:set_int("burn_time", 0)
		meta:set_string("formspec", generator_formspec)
		local inv = meta:get_inventory()
		inv:set_size("src", 1)
	end,	
	can_dig = function(pos,player)
		local meta = minetest.get_meta(pos);
		local inv = meta:get_inventory()
		if not inv:is_empty("src") then
			minetest.chat_send_player(player:get_player_name(),
				"Machine cannot be removed because it is not empty");
			return false
		else
			return true
		end
	end,
})

minetest.register_node("technic:generator_active", {
	description = "Electric Generator",
	tiles = {"technic_generator_top.png",  "technic_machine_bottom.png",
	         "technic_generator_side.png", "technic_generator_side.png",
	         "technic_generator_side.png", "technic_generator_front_active.png"},
	paramtype2 = "facedir",
	groups = {snappy=2, choppy=2, oddly_breakable_by_hand=2,
		not_in_creative_inventory=1},
	legacy_facedir_simple = true,
	sounds = default.node_sound_wood_defaults(),
	drop = "technic:generator",
	can_dig = function(pos,player)
		local meta = minetest.get_meta(pos);
		local inv = meta:get_inventory()
		if not inv:is_empty("src") then
			minetest.chat_send_player(player:get_player_name(),
				"Machine cannot be removed because it is not empty");
			return false
		else
			return true
		end
	end,
})

minetest.register_abm({
	nodenames = {"technic:generator", "technic:generator_active"},
	interval = 1,
	chance   = 1,
	action = function(pos, node, active_object_count, active_object_count_wider)
		local meta = minetest.get_meta(pos)
		local burn_time = meta:get_int("burn_time")
		local burn_totaltime = meta:get_int("burn_totaltime")

		-- If more to burn and the energy produced was used: produce some more
		if burn_time > 0 then
			meta:set_int("LV_EU_supply", 200) -- Give 200EUs
			burn_time = burn_time - 1
			meta:set_int("burn_time", burn_time)
		end

		-- Burn another piece of fuel
		if burn_time == 0 then
			local inv = meta:get_inventory()
			if not inv:is_empty("src") then 
				local fuellist = inv:get_list("src")
				fuel = minetest.get_craft_result({method = "fuel", width = 1, items = fuellist})
				if not fuel or fuel.time == 0 then
					meta:set_string("infotext", "Generator out of fuel")
					hacky_swap_node(pos, "technic:generator")
					return
				end
				meta:set_int("burn_time", fuel.time)
				meta:set_int("burn_totaltime", fuel.time)


				local stack = inv:get_stack("src", 1)
				stack:take_item()
				inv:set_stack("src", 1, stack)
				hacky_swap_node(pos, "technic:generator_active")
				meta:set_int("LV_EU_supply", 200) -- Give 200EUs
			else
				hacky_swap_node(pos, "technic:generator")
				meta:set_int("LV_EU_supply", 0)
			end
		end

		local percent = math.floor((burn_time / burn_totaltime) * 100)
		meta:set_string("infotext", "Electric Generator ("..percent.."%)")
		meta:set_string("formspec",
			"size[8,9]"..
			"label[0,0;Generator]"..
			"list[current_name;src;3,1;1,1;]"..
			"image[4,1;1,1;default_furnace_fire_bg.png^[lowpart:"..
			(percent)..":default_furnace_fire_fg.png]"..
			"list[current_player;main;0,5;8,4;]")
	end
})

technic.register_machine("LV", "technic:generator",        technic.producer)
technic.register_machine("LV", "technic:generator_active", technic.producer)