/*

 * Compile using:

 * valac --pkg gtk+-2.0 --pkg gstreamer-0.10 audio-player.vala

 *

 */

using Gtk;

using Gst;

public class AudioPlayer : Gtk.Window

{

  private Gst.Element playbin;

  private string[] files;

  private Gtk.Label label;

  private int song = 0;

  private bool playing;

  private Gtk.Button play_pause_button;

  public AudioPlayer ()

  {

    this.set_size_request (600, 200);

    this.destroy.connect (Gtk.main_quit);

    var vbox = new Gtk.VBox (false, 0);

    this.label = new Gtk.Label ("Audio Player");

    vbox.pack_start (this.label, true, true, 0);

    this.play_pause_button = new Gtk.Button.from_stock (Gtk.STOCK_MEDIA_PLAY);

    this.play_pause_button.clicked.connect (on_play_pause);

    var next_button = new Gtk.Button.from_stock (Gtk.STOCK_MEDIA_NEXT);

    next_button.clicked.connect (on_next);

    var button_box = new Gtk.HButtonBox ();

    button_box.add (this.play_pause_button);

    button_box.add (next_button);

    vbox.pack_start (button_box, false, true, 0);

    this.add (vbox);

    this.playbin = Gst.ElementFactory.make ("playbin", "play");

  }

  private void on_play_pause ()

  {

    if (this.playing)

    {

      this.playbin.set_state (Gst.State.PAUSED);

      this.play_pause_button.set_label (Gtk.STOCK_MEDIA_PAUSE);

    }

    else

    {

      this.playbin.set_state (Gst.State.PLAYING);

      this.play_pause_button.set_label (Gtk.STOCK_MEDIA_PLAY);

    }

    this.playing = !this.playing;

  }

  private void on_next ()

  {

    this.playbin.set_state (Gst.State.NULL);

    this.playbin.set ("uri", "file://" + this.files[song]);

    this.label.set_text (this.files[song]);

    this.song++;

    if (this.files.length <= this.song)

    {

      this.song = 0;

    }

    this.playbin.set_state (Gst.State.PLAYING);

    this.play_pause_button.set_label (Gtk.STOCK_MEDIA_PLAY);

    this.playing = true;

  }

  public static int main (string[] args)

  {

    Gst.init (ref args);

    Gtk.init (ref args);

    if (args.length < 2)

    {

      print ("usage: audio-player [files...]\n");

      return 1;

    }

    var audio_player = new AudioPlayer ();

    audio_player.files = args[1:args.length];

    audio_player.show_all ();

    audio_player.on_next ();

    Gtk.main ();

    return 0;

  }

}