local f = string.format

-- TODO: this coloring stuff doesn't work because HUDs don't support it :(
local function get_food_color(percent)
	local red, green
	if percent > 0.5 then
		red = f("%02x", math.round(510 * (1 - percent)))
		green = "ff"
	else
		red = "ff"
		green = f("%02x", math.round(510 * percent))
	end
	return f("#%s%s00", red, green)
end

balanced_diet.diet_hud = futil.define_hud("balanced_diet:diet", {
	period = 1,
	enabled_by_default = true,
	get_hud_def = function(player)
		local now = os.time()
		local eaten = balanced_diet.get_eaten(player, now)
		local player_name = player:get_player_name()
		local lang_code = minetest.get_player_information(player_name).lang_code
		local lines = {}
		local function sort_key(value)
			return minetest.get_translated_string(lang_code, minetest.strip_colors(value)):lower()
		end
		local function cmp(a, b)
			return sort_key(a) < sort_key(b)
		end

		for item, remaining in pairs(eaten) do
			local food_def = balanced_diet.get_food_def(item)
			local remaining_percent = remaining / food_def.duration
			local description = futil.get_safe_short_description(item)
			description = minetest.colorize(
				get_food_color(remaining_percent),
				f("%s: %.1f%%", description, 100 * remaining_percent)
			)
			lines[#lines + 1] = description
		end

		table.sort(lines, cmp)

		if #lines > 0 then
			table.insert(lines, "---------------")
		end

		for nutrient, def in
			futil.table.pairs_by_value(balanced_diet.registered_nutrients, function(a, b)
				return cmp(a.description, b.description)
			end)
		do
			local value = balanced_diet.check_nutrient_value(player, nutrient, now)
			lines[#lines + 1] = f("%s: %.1f", def.description, value)
		end

		local text = table.concat(lines, "\n")
		return {
			hud_elem_type = "text",
			text = text,
			number = 0xFFFFFF, --
			direction = 0, -- left to right
			position = { x = 1, y = 1 },
			alignment = { x = -1, y = -1 },
			offset = { x = -10, y = -10 },
			style = 1,
		}
	end,
})

minetest.register_chatcommand("toggle_diet_hud", {
	func = function(name)
		local player = minetest.get_player_by_name(name)
		if not player then
			return false, "you are not a connected player"
		end
		local enabled = balanced_diet.diet_hud:toggle_enabled(player)
		if enabled then
			return true, "hud enabled"
		else
			return true, "hud disabled"
		end
	end,
})