--[[

	TechAge
	=======

	Copyright (C) 2019-2020 Joachim Stolberg

	GPL v3
	See LICENSE.txt for more information
	
	TA3 Tiny Power Generator

]]--

-- for lazy programmers
local M = minetest.get_meta
local S = techage.S

local Cable = techage.ElectricCable
local firebox = techage.firebox
local power = techage.power
local fuel = techage.fuel
local Pipe = techage.LiquidPipe
local liquid = techage.liquid
local networks = techage.networks

local CYCLE_TIME = 2
local PWR_CAPA = 12
local EFFICIENCY = 2.5

local function formspec(self, pos, nvm)
	return "size[5,4]"..
		default.gui_bg..
		default.gui_bg_img..
		default.gui_slots..
		"box[0,-0.1;4.8,0.5;#c6e8ff]"..
		"label[1.5,-0.1;"..minetest.colorize( "#000000", S("Tiny Generator")).."]"..
		fuel.fuel_container(0, 0.9, nvm)..
		"image[1.4,1.6;1,1;techage_form_arrow_bg.png^[transformR270]"..
		"image_button[1.4,3.2;1,1;".. self:get_state_button_image(nvm) ..";state_button;]"..
		"tooltip[1.5,3;1,1;"..self:get_state_tooltip(nvm).."]"..
		power.formspec_label_bar(2.5, 0.8, S("Electricity"), PWR_CAPA, nvm.provided)
end

local function play_sound(pos)
	local mem = techage.get_mem(pos)
	if not mem.handle or mem.handle == -1 then
		mem.handle = minetest.sound_play("techage_generator", {
			pos = pos, 
			gain = 1,
			max_hear_distance = 10,
			loop = true})
		if mem.handle == -1 then
			minetest.after(1, play_sound, pos)
		end
	end
end

local function stop_sound(pos)
	local mem = techage.get_mem(pos)
	if mem.handle then
		minetest.sound_stop(mem.handle)
		mem.handle = nil
	end
end

local function can_start(pos, nvm, state)
	if (nvm.burn_cycles or 0) > 0 or (nvm.liquid and nvm.liquid.amount and nvm.liquid.amount > 0) then 
		return true 
	end
	return S("no fuel")
end

local function start_node(pos, nvm, state)
	nvm.running = true -- needed by fuel_lib
	local outdir = M(pos):get_int("outdir")
	power.generator_start(pos, Cable, CYCLE_TIME, outdir)
	play_sound(pos)
end

local function stop_node(pos, nvm, state)
	nvm.running = false
	nvm.provided = 0
	local outdir = M(pos):get_int("outdir")
	power.generator_stop(pos, Cable, outdir)
	stop_sound(pos)
end

local State = techage.NodeStates:new({
	node_name_passive = "techage:tiny_generator",
	node_name_active = "techage:tiny_generator_on",
	cycle_time = CYCLE_TIME,
	standby_ticks = 0,
	formspec_func = formspec,
	infotext_name = S("TA3 Tiny Power Generator"),
	can_start = can_start,
	start_node = start_node,
	stop_node = stop_node,
})

local function burning(pos, nvm)
	local ratio = math.max((nvm.provided or PWR_CAPA) / PWR_CAPA, 0.02)
	
	nvm.liquid = nvm.liquid or {}
	nvm.liquid.amount = nvm.liquid.amount or 0
	nvm.burn_cycles = (nvm.burn_cycles or 0) - ratio
	if nvm.burn_cycles <= 0 then
		if nvm.liquid.amount > 0 then
			nvm.liquid.amount = nvm.liquid.amount - 1
			nvm.burn_cycles = fuel.burntime(nvm.liquid.name) * EFFICIENCY / CYCLE_TIME
			nvm.burn_cycles_total = nvm.burn_cycles
			return true
		else
			nvm.liquid.name = nil 
			State:fault(pos, nvm, S("no fuel"))
			stop_sound(pos)
			return false
		end
	else
		return true
	end
end

local function node_timer(pos, elapsed)
	local nvm = techage.get_nvm(pos)
	local outdir = M(pos):get_int("outdir")
	if nvm.running and burning(pos, nvm) then
		nvm.provided = power.generator_alive(pos, Cable, CYCLE_TIME, outdir)
	else
		nvm.provided = 0
	end
	if techage.is_activeformspec(pos) then
		M(pos):set_string("formspec", formspec(State, pos, nvm))
	end
	return true
end

local function on_receive_fields(pos, formname, fields, player)
	if minetest.is_protected(pos, player:get_player_name()) then
		return
	end
	local nvm = techage.get_nvm(pos)
	State:state_button_event(pos, nvm, fields)
	M(pos):set_string("formspec", formspec(State, pos, nvm))
end

local function on_rightclick(pos, node, clicker)
	techage.set_activeformspec(pos, clicker)
	local nvm = techage.get_nvm(pos)
	M(pos):set_string("formspec", formspec(State, pos, nvm))
end

local liquid_def = {
	fuel_cat = fuel.BT_NAPHTHA,
	capa = fuel.CAPACITY,
	peek = liquid.srv_peek,
	put = function(pos, indir, name, amount)
		if fuel.valid_fuel(name, fuel.BT_OIL) then
			local res = liquid.srv_put(pos, indir, name, amount)
			if techage.is_activeformspec(pos) then
				local nvm = techage.get_nvm(pos)
				M(pos):set_string("formspec", formspec(State, pos, nvm))
			end
			return res
		end
		return amount
	end,
	take = function(pos, indir, name, amount)
		amount, name = liquid.srv_take(pos, indir, name, amount)
		if techage.is_activeformspec(pos) then
			local nvm = techage.get_nvm(pos)
			M(pos):set_string("formspec", formspec(State, pos, nvm))
		end
		return amount, name
	end
}

local net_def = {
	pipe2 = {
		sides = techage.networks.AllSides, -- Pipe connection sides
		ntype = "tank",
	},
	ele1 = {
		sides = {R = 1},
		ntype = "gen1",
		nominal = PWR_CAPA,
	},
}

minetest.register_node("techage:tiny_generator", {
	description = S("TA3 Tiny Power Generator"),
	tiles = {
		-- up, down, right, left, back, front
		"techage_appl_electric_gen_top.png^techage_frame_ta3_top.png",
		"techage_appl_electric_gen_top.png^techage_frame_ta3.png",
		"techage_appl_electric_gen_side.png^techage_appl_hole_electric.png^techage_frame_ta3.png",
		"techage_appl_electric_gen_side.png^techage_frame_ta3.png",
		"techage_appl_electric_gen_front.png^[transformFX]^techage_frame_ta3.png",
		"techage_appl_electric_gen_front.png^techage_frame_ta3.png",
	},
	paramtype2 = "facedir",
	groups = {cracky=2, crumbly=2, choppy=2},
	on_rotate = screwdriver.disallow,
	is_ground_content = false,

	after_place_node = function(pos)
		local nvm = techage.get_nvm(pos)
		local number = techage.add_node(pos, "techage:tiny_generator")
		nvm.running = false
		nvm.burn_cycles = 0
		State:node_init(pos, nvm, number)
		M(pos):set_string("formspec", formspec(State, pos, nvm))
		M(pos):set_int("outdir", networks.side_to_outdir(pos, "R"))
		Pipe:after_place_node(pos)
		Cable:after_place_node(pos)
	end,
	
	after_dig_node = function(pos, oldnode)
		Pipe:after_dig_node(pos)
		Cable:after_dig_node(pos)
		techage.del_mem(pos)
	end,

	on_receive_fields = on_receive_fields,
	on_rightclick = on_rightclick,
	on_punch = fuel.on_punch,
	on_timer = node_timer,
	can_dig = fuel.can_dig,
	liquid = liquid_def,
	networks = net_def,
})

minetest.register_node("techage:tiny_generator_on", {
	description = S("TA3 Tiny Power Generator"),
	tiles = {
		-- up, down, right, left, back, front
		"techage_appl_electric_gen_top.png^techage_frame_ta3_top.png",
		"techage_appl_electric_gen_top.png^techage_frame_ta3.png",
		"techage_appl_electric_gen_side.png^techage_appl_hole_electric.png^techage_frame_ta3.png",
		"techage_appl_electric_gen_side.png^techage_frame_ta3.png",
		{
			image = "techage_appl_electric_gen_front4.png^[transformFX]^techage_frame4_ta3.png",
			backface_culling = false,
			animation = {
				type = "vertical_frames",
				aspect_w = 32,
				aspect_h = 32,
				length = 0.8,
			},
		},
		{
			image = "techage_appl_electric_gen_front4.png^techage_frame4_ta3.png",
			backface_culling = false,
			animation = {
				type = "vertical_frames",
				aspect_w = 32,
				aspect_h = 32,
				length = 0.8,
			},
		},
	},
	
	paramtype = "light",
	paramtype2 = "facedir",
	groups = {not_in_creative_inventory=1},
	diggable = false,
	light_source = 4,
	on_rotate = screwdriver.disallow,
	is_ground_content = false,

	on_receive_fields = on_receive_fields,
	on_rightclick = on_rightclick,
	on_punch = fuel.on_punch,
	on_timer = node_timer,
	can_dig = fuel.can_dig,
	liquid = liquid_def,
	networks = net_def,
})

Pipe:add_secondary_node_names({"techage:tiny_generator", "techage:tiny_generator_on"})
Cable:add_secondary_node_names({"techage:tiny_generator", "techage:tiny_generator_on"})

techage.register_node({"techage:tiny_generator", "techage:tiny_generator_on"}, {
	on_recv_message = function(pos, src, topic, payload)
		local nvm = techage.get_nvm(pos)
		if topic == "power" then
			return nvm.provided or 0
		elseif topic == "fuel" then
			return techage.fuel.get_fuel_amount(nvm)
		else
			return State:on_receive_message(pos, topic, payload)
		end
	end,
	on_node_load = function(pos, node)
		State:on_node_load(pos)
		if node.name == "techage:tiny_generator_on" then
			play_sound(pos)
		end
		local inv = M(pos):get_inventory()
		if not inv:is_empty("fuel") then
			local nvm = techage.get_nvm(pos)
			nvm.liquid = nvm.liquid or {}
			local count = inv:get_stack("fuel", 1):get_count()
			nvm.liquid.amount = (nvm.liquid.amount or 0) + count
			nvm.liquid.name = "techage:gasoline"
			inv:set_stack("fuel", 1, nil)
		end	
	end,
})	

minetest.register_craft({
	output = "techage:tiny_generator",
	recipe = {
		{'default:steel_ingot', 'techage:usmium_nuggets', 'default:steel_ingot'},
		{'dye:red', 'basic_materials:gear_steel', 'techage:electric_cableS'},
		{'default:steel_ingot', 'techage:vacuum_tube', 'default:steel_ingot'},
	},
})