using System;
using GLib;
using Gst;
using Gst.BasePlugins;

public class PlayBinPlayer {
  private static MainLoop loop;
  private static string[] songs;
  private static int song_idx = 0;
  private static PlayBin play;

  public static void Main (string[] args) {
    if (args.Length < 1) {
      Console.WriteLine ("usage: mono playbin-player.exe audio_file_uri");
      return;
    }

    songs = args;

    Gst.Application.Init ();
    loop = new MainLoop ();

    play = ElementFactory.Make ("playbin", "play") as PlayBin;

    if (play == null) {
      Console.WriteLine ("error creating a playbin gstreamer object");
      return;
    }

    play.Uri = songs[song_idx++];
    play.Bus.AddWatch (new BusFunc (BusCb));
    play.SetState (State.Playing);

    loop.Run ();
  }

  private static bool BusCb (Bus bus, Message message) {
    switch (message.Type) {
      case MessageType.Error:
        Enum err;
        string msg;
        message.ParseError (out err, out msg);
        Console.WriteLine ("Gstreamer error: {0}", msg);
        loop.Quit ();
        break;
      case MessageType.Eos:
        if (song_idx >= songs.Length) {
          Console.WriteLine ("Thank you, come again");
          loop.Quit ();
        } else {
          play.SetState (State.Null);
          play.Uri = songs[song_idx++];
          play.SetState (State.Playing);
        }
        break;
    }

    return true;
  }
}