/*
 * 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 SoundMenu: Object
{
	public enum DisplayFlags {
		NONE = 0,
		SHOW_MUTE = 1,
		HIDE_INACTIVE_PLAYERS = 2,
		HIDE_PLAYERS = 4,
		GREETER_PLAYERS = 8,
		SHOW_SILENT_MODE = 16, 
		HIDE_INACTIVE_PLAYERS_PLAY_CONTROLS = 32,
		ADD_PLAY_CONTROL_INACTIVE_PLAYER = 64
	}

	public enum PlayerSectionPosition {
		LABEL = 0,
		PLAYER_CONTROLS = 1,
		PLAYLIST = 2
	}

	const string PLAYBACK_ITEM_TYPE = "com.canonical.unity.playback-item";

	public SoundMenu (string? settings_action, DisplayFlags flags, string default_player_id) {
		/* A sound menu always has at least two sections: the volume section (this.volume_section)
		 * at the start of the menu, and the settings section at the end. Between those two,
		 * it has a dynamic amount of player sections, one for each registered player.
		 */

		this.volume_section = new Menu ();

		if ((flags & DisplayFlags.SHOW_MUTE) != 0)
			volume_section.append (_("Mute"), "indicator.mute");
		if ((flags & DisplayFlags.SHOW_SILENT_MODE) != 0) {
			var item = new MenuItem(_("Silent Mode"), "indicator.silent-mode");
			item.set_attribute("x-canonical-type", "s", "com.canonical.indicator.switch");
			volume_section.append_item(item);
		}

		volume_section.append_item (this.create_slider_menu_item (_("Volume"), "indicator.volume(0)", 0.0, 1.0, 0.01,
																  "audio-volume-low-zero-panel",
																  "audio-volume-high-panel", true));

		this.menu = new Menu ();
		this.menu.append_section (null, volume_section);

		if (settings_action != null) {
			settings_shown = true;
			this.menu.append (_("Sound Settings…"), settings_action);
		}

		var root_item = new MenuItem (null, "indicator.root");
		root_item.set_attribute ("x-canonical-type", "s", "com.canonical.indicator.root");
		root_item.set_attribute ("x-canonical-scroll-action", "s", "indicator.scroll");
		root_item.set_attribute ("x-canonical-secondary-action", "s", "indicator.mute");
		root_item.set_attribute ("submenu-action", "s", "indicator.indicator-shown");
		root_item.set_submenu (this.menu);

		this.root = new Menu ();
		root.append_item (root_item);

		this.hide_players = (flags & DisplayFlags.HIDE_PLAYERS) != 0;
		this.hide_inactive = (flags & DisplayFlags.HIDE_INACTIVE_PLAYERS) != 0;
		this.hide_inactive_player_controls = (flags & DisplayFlags.HIDE_INACTIVE_PLAYERS_PLAY_CONTROLS) != 0;
		this.add_play_button_inactive_player = (flags & DisplayFlags.ADD_PLAY_CONTROL_INACTIVE_PLAYER) != 0;
		this.notify_handlers = new HashTable<MediaPlayer, ulong> (direct_hash, direct_equal);

		this.greeter_players = (flags & DisplayFlags.GREETER_PLAYERS) != 0;

		this.default_player = default_player_id;

	}

	~SoundMenu () {
		if (export_id != 0) {
			bus.unexport_menu_model(export_id);
			export_id = 0;
		}
	}

	DBusConnection? bus = null;
	uint export_id = 0;

	public void export (DBusConnection connection, string object_path) {
		bus = connection;
		try {
			export_id = bus.export_menu_model (object_path, this.root);
		} catch (Error e) {
			critical ("%s", e.message);
		}
	}

	public bool show_mic_volume {
		get {
			return this.mic_volume_shown;
		}
		set {
			if (value && !this.mic_volume_shown) {
				var slider = this.create_slider_menu_item (_("Microphone Volume"), "indicator.mic-volume", 0.0, 1.0, 0.01,
														   "audio-input-microphone-low-zero-panel",
														   "audio-input-microphone-high-panel", false);
				volume_section.append_item (slider);
				this.mic_volume_shown = true;
			}
			else if (!value && this.mic_volume_shown) {
				int location = -1;
				while ((location = find_action(this.volume_section, "indicator.mic-volume")) != -1) {
					this.volume_section.remove (location);
				}
				this.mic_volume_shown = false;
			}
		}
	}

	public bool show_high_volume_warning {
		get {
			return this.high_volume_warning_shown;
		}
		set {
			if (value && !this.high_volume_warning_shown) {
				/* NOTE: Action doesn't really exist, just used to find below when removing */
				var item = new MenuItem(_("High volume can damage your hearing."), "indicator.high-volume-warning-item");
				volume_section.append_item (item);
				this.high_volume_warning_shown = true;
			}
			else if (!value && this.high_volume_warning_shown) {
				int location = -1;
				while ((location = find_action(this.volume_section, "indicator.high-volume-warning-item")) != -1) {
					this.volume_section.remove (location);
				}
				this.high_volume_warning_shown = false;
			}
		}
	}

	int find_action (Menu menu, string in_action) {
		int n = menu.get_n_items ();
		for (int i = 0; i < n; i++) {
			string action;
			menu.get_item_attribute (i, "action", "s", out action);
			if (in_action == action)
				return i;
		}

		return -1;
	}

	public void update_all_players_play_section() {
		foreach (var player_stored in notify_handlers.get_keys ()) {
			int index = this.find_player_section(player_stored);
			if (index != -1) {
				// just update to verify if we must hide the player controls
				update_player_section (player_stored, index);
			}
		}
	}

	public void add_player (MediaPlayer player) {
		if (this.notify_handlers.contains (player))
			return;

		if (player.is_running || !this.hide_inactive)
			this.insert_player_section (player);
		this.update_playlists (player);

		var handler_id = player.notify["is-running"].connect ( () => {
			int index = this.find_player_section(player);
			if (player.is_running) {
				if (index == -1) {
					this.insert_player_section (player);
				}
				number_of_running_players++;
			}
			else {
				number_of_running_players--;
				if (this.hide_inactive)
					this.remove_player_section (player);
			}
			this.update_playlists (player);

			// we need to update the rest of players, because we might have
			// a non running player still showing the playback controls
			update_all_players_play_section();
		});
		this.notify_handlers.insert (player, handler_id);

		player.playlists_changed.connect (this.update_playlists);
		player.playbackstatus_changed.connect (this.update_playbackstatus);
	}

	public void remove_player (MediaPlayer player) {
		this.remove_player_section (player);

		var id = this.notify_handlers.lookup(player);
		if (id != 0) {
			player.disconnect(id);
		}

		player.playlists_changed.disconnect (this.update_playlists);

		/* this'll drop our ref to it */
		this.notify_handlers.remove (player);
	}

	public void update_volume_slider (VolumeControl.ActiveOutput active_output) {
		int index = find_action (this.volume_section, "indicator.volume");
		if (index != -1) {
			string label = "Volume";
			switch (active_output) {
				case VolumeControl.ActiveOutput.SPEAKERS:
					label = _("Volume");
					break;
				case VolumeControl.ActiveOutput.HEADPHONES:
					label = _("Volume (Headphones)");
					break;
				case VolumeControl.ActiveOutput.BLUETOOTH_SPEAKER:
					label = _("Volume (Bluetooth)");
					break;
				case VolumeControl.ActiveOutput.USB_SPEAKER:
					label = _("Volume (Usb)");
					break;
				case VolumeControl.ActiveOutput.HDMI_SPEAKER:
					label = _("Volume (HDMI)");
					break;
				case VolumeControl.ActiveOutput.BLUETOOTH_HEADPHONES:
					label = _("Volume (Bluetooth headphones)");
					break;
				case VolumeControl.ActiveOutput.USB_HEADPHONES:
					label = _("Volume (Usb headphones)");
					break;
				case VolumeControl.ActiveOutput.HDMI_HEADPHONES:
					label = _("Volume (HDMI headphones)");
					break;
			}
			this.volume_section.remove (index);
			this.volume_section.insert_item (index, this.create_slider_menu_item (_(label), "indicator.volume(0)", 0.0, 1.0, 0.01,
																  "audio-volume-low-zero-panel",
																  "audio-volume-high-panel", true));
		}
	}

	public Menu root;
	public Menu menu;
	Menu volume_section;
	bool mic_volume_shown;
	bool settings_shown = false;
	bool high_volume_warning_shown = false;
	bool hide_inactive;
	bool hide_players = false;
	bool hide_inactive_player_controls = false;
	bool add_play_button_inactive_player = false;
	HashTable<MediaPlayer, ulong> notify_handlers;
	bool greeter_players = false;
	int number_of_running_players = 0;
	string default_player = "";

	/* returns the position in this.menu of the section that's associated with @player */
	int find_player_section (MediaPlayer player) {
		debug("Looking for player: %s", player.id);
		string action_name = @"indicator.$(player.id)";
		int n = this.menu.get_n_items ();
		for (int i = 0; i < n; i++) {
			var section = this.menu.get_item_link (i, Menu.LINK_SECTION);
			if (section == null) continue;

			string action;
			section.get_item_attribute (0, "action", "s", out action);
			if (action == action_name)
				return i;
		}

		debug("Unable to find section for player: %s", player.id);
		return -1;
	}

	int find_player_playback_controls_section (Menu player_menu) {
		int n = player_menu.get_n_items ();
		for (int i = 0; i < n; i++) {
			string type;
			player_menu.get_item_attribute (i, "x-canonical-type", "s", out type);
			if (type == PLAYBACK_ITEM_TYPE)
				return i;
		}

		return -1;
	}

	MenuItem create_playback_menu_item (MediaPlayer player) {
		var playback_item = new MenuItem (null, null);
		playback_item.set_attribute ("x-canonical-type", "s", PLAYBACK_ITEM_TYPE);
		if (player.is_running) {
			if (player.can_do_play) {
				playback_item.set_attribute ("x-canonical-play-action", "s", "indicator.play." + player.id);
			}
			if (player.can_do_next) {
				playback_item.set_attribute ("x-canonical-next-action", "s", "indicator.next." + player.id);
			}
			if (player.can_do_prev) {
				playback_item.set_attribute ("x-canonical-previous-action", "s", "indicator.previous." + player.id);
			}
		} else {
			if (this.add_play_button_inactive_player) {
				playback_item.set_attribute ("x-canonical-play-action", "s", "indicator.play." + player.id);
			}
		}
		return playback_item;
	}

	void insert_player_section (MediaPlayer player) {
		if (this.hide_players)
			return;

		var section = new Menu ();
		Icon icon;

		debug("Adding section for player: %s (%s)", player.id, player.is_running ? "running" : "not running");

		icon = player.icon;
		if (icon == null)
			icon = new ThemedIcon.with_default_fallbacks ("application-default-icon");

		var base_action = "indicator." + player.id;
		if (this.greeter_players)
			base_action += ".greeter";

		var player_item = new MenuItem (player.name, base_action);
		player_item.set_attribute ("x-canonical-type", "s", "com.canonical.unity.media-player");
		if (icon != null)
			player_item.set_attribute_value ("icon", icon.serialize ());
		section.append_item (player_item);

		if (player.is_running|| !this.hide_inactive_player_controls || player.id == this.default_player) {
			var playback_item = create_playback_menu_item (player);
			section.insert_item (PlayerSectionPosition.PLAYER_CONTROLS, playback_item);
		}

		/* Add new players to the end of the player sections, just before the settings */
		if (settings_shown) {
			this.menu.insert_section (this.menu.get_n_items () -1, null, section);
		} else {
			this.menu.append_section (null, section);
		}
	}

	void remove_player_section (MediaPlayer player) {
		if (this.hide_players)
			return;

		int index = this.find_player_section (player);
		if (index >= 0)
			this.menu.remove (index);
	}

	void update_player_section (MediaPlayer player, int index) {
		var player_section = this.menu.get_item_link(index, Menu.LINK_SECTION) as Menu;

		int play_control_index = find_player_playback_controls_section (player_section);
		if (player.is_running && number_of_running_players == 1) {
			// this is the first or the last player running...
			// store its id
			this.last_player_updated (player.id);
		}
		if (player.is_running || !this.hide_inactive_player_controls) {
			MenuItem playback_item = create_playback_menu_item (player);
			if (play_control_index != -1) {
				player_section.remove (PlayerSectionPosition.PLAYER_CONTROLS);	
			}
			player_section.insert_item (PlayerSectionPosition.PLAYER_CONTROLS, playback_item);
		} else {
			if (play_control_index != -1 && number_of_running_players >= 1) {
				// remove both, playlist and play controls
				player_section.remove (PlayerSectionPosition.PLAYLIST);
				player_section.remove (PlayerSectionPosition.PLAYER_CONTROLS);	
			}
		}
	}

	void update_playlists (MediaPlayer player) {
		int index = find_player_section (player);
		if (index < 0)
			return;

		var player_section = this.menu.get_item_link (index, Menu.LINK_SECTION) as Menu;

		/* if a section has three items, the playlists menu is in it */
		if (player_section.get_n_items () == 3)
			player_section.remove (2);

		if (!player.is_running)
			return;

		var count = player.get_n_playlists ();
		if (count == 0)
			return;

		var playlists_section = new Menu ();
		for (int i = 0; i < count; i++) {
			var playlist_id = player.get_playlist_id (i);
			playlists_section.append (player.get_playlist_name (i),
									  @"indicator.play-playlist.$(player.id)::$playlist_id");

		}

		var submenu = new Menu ();
		submenu.append_section (null, playlists_section);
		player_section.append_submenu (_("Choose Playlist"), submenu);
	}
	
	void update_playbackstatus (MediaPlayer player) {
		int index = find_player_section (player);
		if (index != -1) {
			update_player_section (player, index);	
		}
	}

	MenuItem create_slider_menu_item (string label, string action, double min, double max, double step, string min_icon_name, string max_icon_name, bool sync_action) {
		var min_icon = new ThemedIcon.with_default_fallbacks (min_icon_name);
		var max_icon = new ThemedIcon.with_default_fallbacks (max_icon_name);

		var slider = new MenuItem (label, action);
		slider.set_attribute ("x-canonical-type", "s", "com.canonical.unity.slider");
		slider.set_attribute_value ("min-icon", min_icon.serialize ());
		slider.set_attribute_value ("max-icon", max_icon.serialize ());
		slider.set_attribute ("min-value", "d", min);
		slider.set_attribute ("max-value", "d", max);
		slider.set_attribute ("step", "d", step);
		if (sync_action) {
			slider.set_attribute ("x-canonical-sync-action", "s", "indicator.volume-sync");
		}

		return slider;
	}

	public signal void last_player_updated (string player_id);
}