/*
 * Copyright 2013 Canonical Ltd.
 *
 * 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; version 3.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * Authors:
 *      Lars Uebernickel <lars.uebernickel@canonical.com>
 */

public class IndicatorSound.Service: Object {
	public Service (MediaPlayerList playerlist) {
		this.settings = new Settings ("com.canonical.indicator.sound");
		this.sharedsettings = new Settings ("com.ubuntu.sound");

		this.settings.bind ("visible", this, "visible", SettingsBindFlags.GET);
		this.notify["visible"].connect ( () => this.update_root_icon () );

		this.volume_control = new VolumeControl ();

		/* If we're on the greeter, don't export */
		if (GLib.Environment.get_user_name() != "lightdm") {
			this.accounts_service = new AccountsServiceUser();

			this.accounts_service.notify["showDataOnGreeter"].connect(() => {
				this.export_to_accounts_service = this.accounts_service.showDataOnGreeter;
				eventually_update_player_actions();
			});

			this.export_to_accounts_service = this.accounts_service.showDataOnGreeter;
		}

		this.players = playerlist;
		this.players.player_added.connect (this.player_added);
		this.players.player_removed.connect (this.player_removed);

		this.actions = new SimpleActionGroup ();
		this.actions.add_action_entries (action_entries, this);
		this.actions.add_action (this.create_silent_mode_action ());
		this.actions.add_action (this.create_mute_action ());
		this.actions.add_action (this.create_volume_action ());
		this.actions.add_action (this.create_mic_volume_action ());
		this.actions.add_action (this.create_high_volume_actions ());

		this.menus = new HashTable<string, SoundMenu> (str_hash, str_equal);
		this.menus.insert ("desktop_greeter", new SoundMenu (null, SoundMenu.DisplayFlags.SHOW_MUTE | SoundMenu.DisplayFlags.HIDE_PLAYERS | SoundMenu.DisplayFlags.GREETER_PLAYERS));
		this.menus.insert ("phone_greeter", new SoundMenu (null, SoundMenu.DisplayFlags.SHOW_SILENT_MODE | SoundMenu.DisplayFlags.HIDE_INACTIVE_PLAYERS | SoundMenu.DisplayFlags.GREETER_PLAYERS | SoundMenu.DisplayFlags.HIGH_VOLUME_WARNING));
		this.menus.insert ("desktop", new SoundMenu ("indicator.desktop-settings", SoundMenu.DisplayFlags.SHOW_MUTE));
		this.menus.insert ("phone", new SoundMenu ("indicator.phone-settings", SoundMenu.DisplayFlags.SHOW_SILENT_MODE | SoundMenu.DisplayFlags.HIDE_INACTIVE_PLAYERS | SoundMenu.DisplayFlags.HIGH_VOLUME_WARNING));

		this.menus.@foreach ( (profile, menu) => {
			this.volume_control.bind_property ("active-mic", menu, "show-mic-volume", BindingFlags.SYNC_CREATE);
		});

		this.sync_preferred_players ();
		this.settings.changed["interested-media-players"].connect ( () => {
			this.sync_preferred_players ();
		});

		if (settings.get_boolean ("show-notify-osd-on-scroll")) {
			List<string> caps = Notify.get_server_caps ();
			if (caps.find_custom ("x-canonical-private-synchronous", strcmp) != null) {
				this.notification = new Notify.Notification ("indicator-sound", "", "");
				this.notification.set_hint_string ("x-canonical-private-synchronous", "indicator-sound");
			}
		}

		sharedsettings.bind ("allow-amplified-volume", this, "allow-amplified-volume", SettingsBindFlags.GET);
	}

	~Service() {
		if (this.sound_was_blocked_timeout_id > 0) {
			Source.remove (this.sound_was_blocked_timeout_id);
			this.sound_was_blocked_timeout_id = 0;
		}
	}

	bool greeter_show_track () {
		return export_to_accounts_service;
	}

	void clear_acts_player () {
		/* NOTE: This is a bit of a hack to ensure that accounts service doesn't
		   continue to export the player by keeping a ref in the timer */
		if (this.accounts_service != null)
			this.accounts_service.player = null;
	}

	public int run () {
		if (this.loop != null) {
			warning ("service is already running");
			return 1;
		}

		Bus.own_name (BusType.SESSION, "com.canonical.indicator.sound", BusNameOwnerFlags.NONE,
			this.bus_acquired, null, this.name_lost);

		this.loop = new MainLoop (null, false);

		GLib.Unix.signal_add(GLib.ProcessSignal.TERM, () => {
			debug("SIGTERM recieved, stopping our mainloop");
			this.loop.quit();
			return false;
		});

		this.loop.run ();

		clear_acts_player();

		return 0;
	}

	public bool visible { get; set; }

	public bool allow_amplified_volume {
		get {
			return this.max_volume > 1.0;
		}

		set {
			if (value) {
				/* from pulse/volume.h: #define PA_VOLUME_UI_MAX (pa_sw_volume_from_dB(+11.0)) */
				this.max_volume = (double)PulseAudio.Volume.sw_from_dB(11.0) / PulseAudio.Volume.NORM;
			}
			else {
				this.max_volume = 1.0;
			}

			/* Normalize volume, because the volume action's state is [0.0, 1.0], see create_volume_action() */
			this.actions.change_action_state ("volume", this.volume_control.get_volume () / this.max_volume);
		}
	}

	const ActionEntry[] action_entries = {
		{ "root", null, null, "@a{sv} {}", null },
		{ "scroll", activate_scroll_action, "i", null, null },
		{ "desktop-settings", activate_desktop_settings, null, null, null },
		{ "phone-settings", activate_phone_settings, null, null, null },
	};

	MainLoop loop;
	SimpleActionGroup actions;
	HashTable<string, SoundMenu> menus;
	Settings settings;
	Settings sharedsettings;
	VolumeControl volume_control;
	MediaPlayerList players;
	uint player_action_update_id;
	bool mute_blocks_sound;
	uint sound_was_blocked_timeout_id;
	Notify.Notification notification;
	bool syncing_preferred_players = false;
	AccountsServiceUser? accounts_service = null;
	bool export_to_accounts_service = false;

	/* Maximum volume as a scaling factor between the volume action's state and the value in
	 * this.volume_control. See create_volume_action().
	 */
	double max_volume = 1.0;

	const double volume_step_percentage = 0.06;

	void activate_scroll_action (SimpleAction action, Variant? param) {
		int delta = param.get_int32(); /* positive for up, negative for down */

		double v = this.volume_control.get_volume () + volume_step_percentage * delta;
		this.volume_control.set_volume (v.clamp (0.0, this.max_volume));

		if (this.notification != null) {
			string icon;
			if (v <= 0.0)
				icon = "notification-audio-volume-off";
			else if (v <= 0.3)
				icon = "notification-audio-volume-low";
			else if (v <= 0.7)
				icon = "notification-audio-volume-medium";
			else
				icon = "notification-audio-volume-high";

			this.notification.update ("indicator-sound", "", icon);
			this.notification.set_hint_int32 ("value", ((int32) (100 * v / this.max_volume)).clamp (-1, 101));
			try {
				this.notification.show ();
			}
			catch (Error e) {
				warning ("unable to show notification: %s", e.message);
			}
		}
	}

	void activate_desktop_settings (SimpleAction action, Variant? param) {
		var env = Environment.get_variable ("DESKTOP_SESSION");
		string cmd;
		if (env == "xubuntu" || env == "ubuntustudio")
			cmd = "pavucontrol";
		else
		{
			if (Environment.get_variable ("XDG_CURRENT_DESKTOP") == "Unity" && Environment.find_program_in_path ("unity-control-center") != null)
				cmd = "unity-control-center sound";
			else
				cmd = "gnome-control-center sound";
		}

		try {
			Process.spawn_command_line_async (cmd);
		} catch (Error e) {
			warning ("unable to launch sound settings: %s", e.message);
		}
	}

	void activate_phone_settings (SimpleAction action, Variant? param) {
		UrlDispatch.send ("settings:///system/sound");
	}

	/* Returns a serialized version of @icon_name suited for the panel */
	static Variant serialize_themed_icon (string icon_name)
	{
		var icon = new ThemedIcon.with_default_fallbacks (icon_name);
		return icon.serialize ();
	}

	void update_root_icon () {
		double volume = this.volume_control.get_volume ();
		string icon;
		if (this.volume_control.mute)
			icon = this.mute_blocks_sound ? "audio-volume-muted-blocking-panel" : "audio-volume-muted-panel";
		else if (volume <= 0.0)
			icon = "audio-volume-low-zero-panel";
		else if (volume <= 0.3)
			icon = "audio-volume-low-panel";
		else if (volume <= 0.7)
			icon = "audio-volume-medium-panel";
		else
			icon  = "audio-volume-high-panel";

		string accessible_name;
		if (this.volume_control.mute) {
			accessible_name = _("Volume (muted)");
		} else {
			int volume_int = (int)(volume * 100);
			accessible_name = "%s (%d%%)".printf (_("Volume"), volume_int);
		}

		var root_action = actions.lookup_action ("root") as SimpleAction;
		var builder = new VariantBuilder (new VariantType ("a{sv}"));
		builder.add ("{sv}", "title", new Variant.string (_("Sound")));
		builder.add ("{sv}", "accessible-desc", new Variant.string (accessible_name));
		builder.add ("{sv}", "icon", serialize_themed_icon (icon));
		builder.add ("{sv}", "visible", new Variant.boolean (this.visible));
		root_action.set_state (builder.end());
	}

	Action create_silent_mode_action () {
		bool silentNow = false;
		if (this.accounts_service != null) {
			silentNow = this.accounts_service.silentMode;
		}

		var silent_action = new SimpleAction.stateful ("silent-mode", null, new Variant.boolean (silentNow));

		/* If we're not dealing with accounts service, we'll just always be out
		   of silent mode and that's cool. */
		if (this.accounts_service == null) {
			return silent_action;
		}

		this.accounts_service.notify["silentMode"].connect(() => {
			silent_action.set_state(new Variant.boolean(this.accounts_service.silentMode));
			this.update_root_icon ();
		});

		silent_action.activate.connect ((action, param) => {
			action.change_state (new Variant.boolean (!action.get_state().get_boolean()));
		});

		silent_action.change_state.connect ((action, val) => {
			this.accounts_service.silentMode = val.get_boolean();
		});

		return silent_action;
	}

	Action create_mute_action () {
		var mute_action = new SimpleAction.stateful ("mute", null, new Variant.boolean (this.volume_control.mute));

		mute_action.activate.connect ( (action, param) => {
			action.change_state (new Variant.boolean (!action.get_state ().get_boolean ()));
		});

		mute_action.change_state.connect ( (action, val) => {
			volume_control.set_mute (val.get_boolean ());
		});

		this.volume_control.notify["mute"].connect ( () => {
			mute_action.set_state (new Variant.boolean (this.volume_control.mute));
			this.update_root_icon ();
		});

		this.volume_control.notify["is-playing"].connect( () => {
			if (!this.volume_control.mute) {
				this.mute_blocks_sound = false;
				return;
			}

			if (this.volume_control.is_playing) {
				this.mute_blocks_sound = true;
			}
			else if (this.mute_blocks_sound) {
				/* Continue to show the blocking icon five seconds after a player has tried to play something */
				if (this.sound_was_blocked_timeout_id > 0)
					Source.remove (this.sound_was_blocked_timeout_id);

				this.sound_was_blocked_timeout_id = Timeout.add_seconds (5, () => {
					this.mute_blocks_sound = false;
					this.sound_was_blocked_timeout_id = 0;
					this.update_root_icon ();
					return false;
				});
			}

			this.update_root_icon ();
		});

		return mute_action;
	}

	void volume_changed (double volume) {
		var volume_action = this.actions.lookup_action ("volume") as SimpleAction;

		/* Normalize volume, because the volume action's state is [0.0, 1.0], see create_volume_action() */
		volume_action.set_state (new Variant.double (volume / this.max_volume));

		this.update_root_icon ();
	}

	Action create_volume_action () {
		/* The action's state is between be in [0.0, 1.0] instead of [0.0,
		 * max_volume], so that we don't need to update the slider menu item
		 * every time allow-amplified-volume is changed.  Convert between the
		 * two here, so that we always pass the full range into
		 * volume_control.set_volume().
		 */

		double volume = this.volume_control.get_volume () / this.max_volume;

		var volume_action = new SimpleAction.stateful ("volume", VariantType.INT32, new Variant.double (volume));

		volume_action.change_state.connect ( (action, val) => {
			double v = val.get_double () * this.max_volume;
			volume_control.set_volume (v.clamp (0.0, this.max_volume));
		});

		/* activating this action changes the volume by the amount given in the parameter */
		volume_action.activate.connect ( (action, param) => {
			int delta = param.get_int32 ();
			double v = volume_control.get_volume () + volume_step_percentage * delta;
			volume_control.set_volume (v.clamp (0.0, this.max_volume));
		});

		this.volume_control.volume_changed.connect (volume_changed);

		this.volume_control.bind_property ("ready", volume_action, "enabled", BindingFlags.SYNC_CREATE);

		return volume_action;
	}

	Action create_mic_volume_action () {
		var volume_action = new SimpleAction.stateful ("mic-volume", null, new Variant.double (this.volume_control.get_mic_volume ()));

		volume_action.change_state.connect ( (action, val) => {
			volume_control.set_mic_volume (val.get_double ());
		});

		this.volume_control.mic_volume_changed.connect ( (volume) => {
			volume_action.set_state (new Variant.double (volume));
		});

		this.volume_control.bind_property ("ready", volume_action, "enabled", BindingFlags.SYNC_CREATE);

		return volume_action;
	}

	Action create_high_volume_actions () {
		var high_volume_action = new SimpleAction.stateful("high-volume", null, new Variant.boolean (this.volume_control.high_volume));

		this.volume_control.notify["high_volume"].connect( () =>
			high_volume_action.set_state(new Variant.boolean (this.volume_control.high_volume)));

		/* So this is a bit confusing, putting it here because everywhere else
		   sucks too. It might create an action and put it into the action group.
		   Which is sneaky. Better to have the code not duplicated, but no good
		   place to put code like that. */
		setup_high_volume_menu_action();

		return high_volume_action;
	}

	void setup_high_volume_menu_action () {
		this.volume_control.notify["high_volume"].connect(update_high_volume_menu_action);
		update_high_volume_menu_action();
	}

	void update_high_volume_menu_action () {
		if (this.volume_control.high_volume) {
			var menu_action = new SimpleAction("high-volume-menu", null);
			menu_action.set_enabled(false);
			this.actions.add_action(menu_action);
		} else {
			this.actions.remove_action("high-volume-menu");
		}
	}

	void bus_acquired (DBusConnection connection, string name) {
		try {
			connection.export_action_group ("/com/canonical/indicator/sound", this.actions);
		} catch (Error e) {
			critical ("%s", e.message);
		}

		this.menus.@foreach ( (profile, menu) => menu.export (connection, @"/com/canonical/indicator/sound/$profile"));
	}

	void name_lost (DBusConnection connection, string name) {
		this.loop.quit ();
	}

	Variant action_state_for_player (MediaPlayer player, bool show_track = true) {
		var builder = new VariantBuilder (new VariantType ("a{sv}"));
		builder.add ("{sv}", "running", new Variant ("b", player.is_running));
		builder.add ("{sv}", "state", new Variant ("s", player.state));
		if (player.current_track != null && show_track) {
			builder.add ("{sv}", "title", new Variant ("s", player.current_track.title));
			builder.add ("{sv}", "artist", new Variant ("s", player.current_track.artist));
			builder.add ("{sv}", "album", new Variant ("s", player.current_track.album));
			builder.add ("{sv}", "art-url", new Variant ("s", player.current_track.art_url));
		}
		return builder.end ();
	}

	bool update_player_actions () {
		bool clear_accounts_player = true;

		foreach (var player in this.players) {
			SimpleAction? action = this.actions.lookup_action (player.id) as SimpleAction;
			if (action != null) {
				action.set_state (this.action_state_for_player (player));
				action.set_enabled (player.can_raise);
			}
			
			SimpleAction? greeter_action = this.actions.lookup_action (player.id + ".greeter") as SimpleAction;
			if (greeter_action != null) {
				greeter_action.set_state (this.action_state_for_player (player, greeter_show_track()));
				greeter_action.set_enabled (player.can_raise);
			}
			
			/* If we're playing then put that data in accounts service */
			if (player.is_running && export_to_accounts_service && accounts_service != null) {
				accounts_service.player = player;
				clear_accounts_player = false;
			}
		}

		if (clear_accounts_player)
			clear_acts_player();

		this.player_action_update_id = 0;
		return false;
	}

	void eventually_update_player_actions () {
		if (player_action_update_id == 0)
			this.player_action_update_id = Idle.add (this.update_player_actions);
	}


	void sync_preferred_players () {
		this.syncing_preferred_players = true;
		this.players.sync (settings.get_strv ("interested-media-players"));
		this.syncing_preferred_players = false;
	}

	void update_preferred_players () {
		/* only write the key if we're not getting this call because we're syncing from the key right now */
		if (!this.syncing_preferred_players) {
			var builder = new VariantBuilder (VariantType.STRING_ARRAY);
			foreach (var player in this.players)
				builder.add ("s", player.id);
			this.settings.set_value ("interested-media-players", builder.end ());
		}
	}

	void player_added (MediaPlayer player) {
		this.menus.@foreach ( (profile, menu) => menu.add_player (player));

		SimpleAction action = new SimpleAction.stateful (player.id, null, this.action_state_for_player (player));
		action.set_enabled (player.can_raise);
		action.activate.connect ( () => { player.activate (); });
		this.actions.add_action (action);

		SimpleAction greeter_action = new SimpleAction.stateful (player.id + ".greeter", null, this.action_state_for_player (player, greeter_show_track()));
		greeter_action.set_enabled (player.can_raise);
		greeter_action.activate.connect ( () => { player.activate (); });
		this.actions.add_action (greeter_action);

		var play_action = new SimpleAction.stateful ("play." + player.id, null, player.state);
		play_action.activate.connect ( () => player.play_pause () );
		this.actions.add_action (play_action);
		player.notify["state"].connect ( (object, pspec) => {
			play_action.set_state (player.state);
		});

		var next_action = new SimpleAction ("next." + player.id, null);
		next_action.activate.connect ( () => player.next () );
		this.actions.add_action (next_action);

		var prev_action = new SimpleAction ("previous." + player.id, null);
		prev_action.activate.connect ( () => player.previous () );
		this.actions.add_action (prev_action);

		var playlist_action = new SimpleAction ("play-playlist." + player.id, VariantType.STRING);
		playlist_action.activate.connect ( (parameter) => player.activate_playlist_by_name (parameter.get_string ()) );
		this.actions.add_action (playlist_action);

		player.notify.connect (this.eventually_update_player_actions);

		this.update_preferred_players ();
	}

	void player_removed (MediaPlayer player) {
		this.actions.remove_action (player.id);
		this.actions.remove_action ("play." + player.id);
		this.actions.remove_action ("next." + player.id);
		this.actions.remove_action ("previous." + player.id);
		this.actions.remove_action ("play-playlist." + player.id);

		player.notify.disconnect (this.eventually_update_player_actions);

		this.menus.@foreach ( (profile, menu) => menu.remove_player (player));

		this.update_preferred_players ();
	}
}