/*
 * This file is part of budgie-desktop
 *
 * Copyright © 2015-2020 Budgie Desktop Developers
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

namespace Budgie {
	[DBus (name="org.gnome.ScreenSaver")]
	public interface ScreenSaver : GLib.Object {
		public abstract void lock() throws Error;
	}

	[DBus (name="org.gnome.SessionManager")]
	public interface SessionManager : GLib.Object {
		public abstract async void Logout(uint mode) throws DBusError, IOError;
	}

	class PowerStrip : Gtk.EventBox {
		private ScreenSaver? saver = null;
		private SessionManager? session = null;

		private Gtk.Button? lock_btn = null;
		private Gtk.Button? power_btn = null;

		async void setup_dbus() {
			try {
				saver = yield Bus.get_proxy(BusType.SESSION, "org.gnome.ScreenSaver", "/org/gnome/ScreenSaver");
			} catch (Error e) {
				warning("Unable to contact login manager: %s", e.message);
				return;
			}
			try {
				session = yield Bus.get_proxy(BusType.SESSION, "org.gnome.SessionManager", "/org/gnome/SessionManager");
			} catch (Error e) {
				power_btn.sensitive = false;
				warning("Unable to contact GNOME Session: %s", e.message);
			}
		}

		public PowerStrip(Budgie.Raven? raven) {
			Gtk.Box? bottom = new Gtk.Box(Gtk.Orientation.HORIZONTAL, 20);

			margin_top = 10;
			get_style_context().add_class("raven-header");
			get_style_context().add_class("powerstrip");
			get_style_context().add_class("bottom");
			bottom.halign = Gtk.Align.CENTER;
			bottom.margin_top = 5;
			bottom.margin_bottom = 5;
			add(bottom);

			get_style_context().add_class("primary-control");

			var btn = new Gtk.Button.from_icon_name("preferences-system-symbolic", Gtk.IconSize.SMALL_TOOLBAR);
			btn.clicked.connect(() => {
				raven.set_expanded(false);
				raven.request_settings_ui();
			});
			btn.halign = Gtk.Align.START;
			btn.get_style_context().add_class("flat");
			bottom.pack_start(btn, false, false, 0);

			btn = new Gtk.Button.from_icon_name("system-lock-screen-symbolic", Gtk.IconSize.SMALL_TOOLBAR);
			btn.clicked.connect(() => {
				raven.set_expanded(false);
				lock_screen();
			});
			lock_btn = btn;
			btn.halign = Gtk.Align.START;
			btn.get_style_context().add_class("flat");
			bottom.pack_start(btn, false, false, 0);

			btn = new Gtk.Button.from_icon_name("system-log-out-symbolic", Gtk.IconSize.SMALL_TOOLBAR);
			power_btn = btn;
			btn.clicked.connect(() => {
				try {
					raven.set_expanded(false);
					if (session == null) {
						return;
					}
					session.Logout.begin(0);
				} catch (Error e) {
					message("Error invoking end session dialog: %s", e.message);
				}
			});
			btn.halign = Gtk.Align.START;
			btn.get_style_context().add_class("flat");
			bottom.pack_start(btn, false, false, 0);

			lock_btn.no_show_all = true;
			lock_btn.hide();
			setup_dbus.begin((obj, res) => {
				if (saver != null) {
					lock_btn.no_show_all = false;
					lock_btn.show_all();
				}
			});
		}

		void lock_screen() {
			try {
				saver.lock();
			} catch (Error e) {
				warning("Cannot lock screen: %s", e.message);
			}
		}
	}
}
