using Gtk;

public class Connection {
	private InetSocketAddress host;
	public signal void response_received(uint8[] response);

	public Connection() {
		var loopback = new InetAddress.loopback(SocketFamily.IPV6);
		host = new InetSocketAddress(loopback, 12888);
	}

	public async void send(uint8[] message) throws Error {
		var client = new SocketClient();
		var conn = yield client.connect_async(host);
		yield conn.output_stream.write_async(message);

		var response = new uint8[1024];
		var len = yield conn.input_stream.read_async(response);
		response_received(response[0:len]);
	}
}

public class MainWindow : Gtk.ApplicationWindow {
	private Connection connection;
	private Gtk.Label response_label;
	private Gtk.Button connect_button;

	public MainWindow(Gtk.Application app, Connection connection) {
		Object(application: app);

		default_width = 600;
		default_height = 400;
		title = "Study System Client";

		this.connection = connection;
		connection.response_received.connect((response) => {
				response_label.label = "Response: " + (string)response;
		});

		var box = new Gtk.Box(Gtk.Orientation.VERTICAL, 10);
		box.margin_start = 10;
		box.margin_end = 10;
		box.margin_top = 10;
		box.margin_bottom = 10;

		connect_button = new Gtk.Button.with_label("Foo");
		connect_button.clicked.connect(on_connect_clicked);
		box.append(connect_button);

		response_label = new Gtk.Label("");
		response_label.wrap = true;
		box.append(response_label);

		set_child(box);
						  
		present();
	}

	private async void on_connect_clicked() {
		try {
			yield connection.send("Bar".data);
		} catch (Error e) {
			response_label.label = "Error: " + e.message;
		}
	}
}

public class StudySystemClient : Gtk.Application {
	public StudySystemClient() {
		Object(application_id: "sh.wip.study-system-client");
	}

	protected override void activate() {
		var connection = new Connection();
		new MainWindow(this, connection);
	}

	public static int main(string[] args) {
		var app = new StudySystemClient();
		return app.run(args);
	}
}