use fmt;
use tb = termbox2;

fn paint_cell(x: size, y: size, c: tb::uattr) void =
	tb::set_cell(x: int, y: int, ' ', tb::COLOR.DEFAULT, c)!;

fn show_colors() size = {
	let colors = [
		tb::COLOR.BLACK,
		tb::COLOR.RED,
		tb::COLOR.GREEN,
		tb::COLOR.YELLOW,
		tb::COLOR.BLUE,
		tb::COLOR.MAGENTA,
		tb::COLOR.CYAN,
		tb::COLOR.WHITE,
	];

	tb::print(0, 0, tb::COLOR.DEFAULT, tb::COLOR.DEFAULT,
		"8 regular colors:")!;
	tb::print(0, 2, tb::COLOR.DEFAULT, tb::COLOR.DEFAULT,
		"8 bright colors:")!;
	for (let i: size = 0; i < len(colors); i += 1) {
		// 8 regular colors.
		paint_cell(i, 1, colors[i]);

		// 8 bright colors.
		paint_cell(i, 3, colors[i] | tb::ATTRIBUTE.BRIGHT);
	};

	return 4;
};

export fn main() int = {
	let e = tb::init();
	if (e is tb::err)
		fmt::fatalf(tb::strerror(e as tb::err));
	defer tb::shutdown()!;

	let w = tb::width()!;
	let h = tb::height()!;
	tb::print(0, (h - 1): int, tb::COLOR.DEFAULT, tb::COLOR.DEFAULT,
		"Press any key to exit")!;

	show_colors();

	for (true) {
		let e = tb::present();
		if (e is tb::err)
			fmt::fatalf(tb::strerror(e as tb::err));
		match (tb::poll_event()) {
		case let e: tb::err => {
			if (e == tb::ERR.NO_EVENT)
				continue
			else
				tb::print(0, h:int -1,
					tb::COLOR.DEFAULT, tb::COLOR.DEFAULT,
					"Unexpected error {}!", tb::strerror(e))!;
		};
		case tb::key_event => break;
		case (tb::mouse_event | tb::resize_event) => continue;
		};
	};
	return 0;
};