--[[

	TechAge
	=======

	Copyright (C) 2019 Joachim Stolberg

	GPL v3
	See LICENSE.txt for more information
	
	Firebox basic functions

]]--

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

techage.firebox = {}

techage.firebox.Burntime = {
	["techage:charcoal"] = true, -- will be replaced by burntime
	["default:coal_lump"] = true,
	["default:coalblock"] = true,
	["techage:oil_source"] = true,
	["techage:gas"] = true,
	["techage:gasoline"] = true,
	["techage:naphtha"] = true,
	["techage:fueloil"] = true,
}

techage.firebox.ValidOilFuels = {
	["techage:gasoline"] = 1, -- category
	["techage:naphtha"] = 2,
	["techage:fueloil"] = 3,
	["techage:oil_source"] = 4,
}


local function determine_burntimes()
	for k,_ in pairs(techage.firebox.Burntime)do
		local fuel,_ = minetest.get_craft_result({method = "fuel", width = 1, items = {k}})
		techage.firebox.Burntime[k] = fuel.time
	end
end	
minetest.after(1, determine_burntimes)

function techage.firebox.formspec(mem)
	local fuel_percent = 0
	if mem.running then
		fuel_percent = ((mem.burn_cycles or 1) * 100) / (mem.burn_cycles_total or 1)
	end
	if mem.power_level then
		return "size[8,6.5]"..
			default.gui_bg..
			default.gui_bg_img..
			default.gui_slots..
			"list[current_name;fuel;1,0.5;1,1;]"..
			"image[2,0.5;1,1;default_furnace_fire_bg.png^[lowpart:"..
			fuel_percent..":default_furnace_fire_fg.png]"..
			"label[4.5,0.1;"..S("Power")..":]"..
			"dropdown[6,0;1.8;power_level;25%,50%,75%,100%;"..mem.power_level.."]"..
			"button[1,1.5;1.8,1;update;"..S("Update").."]"..
			"list[current_player;main;0,2.8;8,4;]"..
			"listring[current_name;fuel]"..
			"listring[current_player;main]"..
			default.get_hotbar_bg(0, 2.8)
	else
		return "size[8,6]"..
			default.gui_bg..
			default.gui_bg_img..
			default.gui_slots..
			"list[current_name;fuel;1,0.5;1,1;]"..
			"image[3,0.5;1,1;default_furnace_fire_bg.png^[lowpart:"..
			fuel_percent..":default_furnace_fire_fg.png]"..
			"button[5,0.5;1.8,1;update;"..S("Update").."]"..
			"list[current_player;main;0,2;8,4;]"..
			"listring[current_name;fuel]"..
			"listring[current_player;main]"..
			default.get_hotbar_bg(0, 2)
	end
end

function techage.firebox.can_dig(pos, player)
	local inv = M(pos):get_inventory()
	return inv:is_empty("fuel")
end

function techage.firebox.allow_metadata_inventory_put(pos, listname, index, stack, player)
	if minetest.is_protected(pos, player:get_player_name()) then
		return 0
	end
	if techage.firebox.Burntime[stack:get_name()] then
		return stack:get_count()
	end
	return 0
end

function techage.firebox.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 PowerLevel = {
	["25%"] = 1,
	["50%"] = 2,
	["75%"] = 3,
	["100%"] = 4,
}

function techage.firebox.on_receive_fields(pos, formname, fields, player)
	if minetest.is_protected(pos, player:get_player_name()) then
		return
	end
	if fields.update then
		local mem = tubelib2.get_mem(pos)
		M(pos):set_string("formspec", techage.firebox.formspec(mem))
	end
	if fields.power_level then
		local mem = tubelib2.get_mem(pos)
		mem.power_level = PowerLevel[fields.power_level]
	end
end

function techage.firebox.on_rightclick(pos, node, clicker)
	local mem = tubelib2.get_mem(pos)
	M(pos):set_string("formspec", techage.firebox.formspec(mem))
end

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

function techage.firebox.get_fuel(pos)
	local inv = M(pos):get_inventory()
	local items = inv:get_stack("fuel", 1)
	if items:get_count() > 0 then
		local taken = items:take_item(1)
		inv:set_stack("fuel", 1, items)
		return taken
	end
end

function techage.firebox.has_fuel(pos)
	local inv = M(pos):get_inventory()
	local items = inv:get_stack("fuel", 1)
	return items:get_count() > 0
end