/**
  * mp3playa - Streaming Flash Mp3 player
  *
  * Copyright (C) 2004,2005  Troels Knak-Nielsen <troels@kyberfabrikken.dk>
  * 
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation;
  * version 2.1 of the License.
  * 
  * This library 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
  * Lesser General Public License for more details.
  * 
  * You should have received a copy of the GNU Lesser General Public
  * License along with this library; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  *
  * @version 1.5
  *
  * Modified by robert@grandcentral.com 6/6/2006
  * - Addition of Playa.surl to hold currently played url in memory
  * - Playa loaded through Prototype's Event.observe
  */

var Playa = {};

// constants
Playa.VERSION = "1.5";
Playa.STATE_STOPPED = 0;
Playa.STATE_PLAYING = 1;

// private
Playa.__isStarted = false;

// events
Playa.onPlayStop = function() {};
Playa.onPlayStart = function() {};
Playa.onStateChange = function() {};

// public properties
Playa.title = "";
Playa.playListPosition = -1;
Playa.playlistSize = -1;
Playa.path = "";
Playa.state = Playa.STATE_STOPPED;
Playa.btnState = "Loading";
Playa.surl = "";

/**
  * Internal function to retrieve player-object
  * @private
  */
Playa.__getPlaya = function() {
  //using prototype to get the playa.
  //var p = $('playa');
  //IE
  if (navigator.appName.indexOf("Microsoft Internet Explorer") !=-1) {
    var p = document.getElementById("playa");
    //var p = window["playa"];
  } else {
    var p = document["playa"];
  }
  //var p = document.getElementById('playa');
  
  if (typeof(p) != "undefined") {
    //alert(typeof(p));
    if (p.PercentLoaded() == 100) {
      return p;
    }
  }
  return p;
};

/**
  * This is the main loop
  * @private
  */
Playa.poll = function() {
  var p = Playa.__getPlaya();
  setTimeout("Playa.poll()", 200);
  if (p != null) {
    var previousState = Playa.state;
    var previousPath = Playa.path;

    Playa.title = p.GetVariable("Response_title");
    Playa.playListPosition = parseInt(p.GetVariable("Response_playListPosition"));
    Playa.path = p.GetVariable("Response_path");
    Playa.btnState = p.GetVariable("Response_btnState");
    Playa.playlistSize = parseInt(p.GetVariable("Response_playlistSize"));

    // update state
    if (Playa.btnState == "Play") {
      Playa.state = Playa.STATE_STOPPED;
    } else if (Playa.btnState == "Stop") {
      Playa.state = Playa.STATE_PLAYING;
    }

    // trigger events
    if (Playa.state != previousState || previousPath != Playa.path) {
      if (Playa.state == Playa.STATE_STOPPED) {
        Playa.onPlayStop();
      } else {
        Playa.onPlayStart();
      }
      Playa.onStateChange();
    }
  }
};

/**
  * Starts the playa
  * @public
  */
Playa.start = function() {
  if (Playa.__isStarted) {
    return;
  }
  Playa.poll();
  Playa.__isStarted = true;
};

/**
  * Fire this event when user press the play/stop button
  * Toggles between playing/stopped state.
  * @public
  */
Playa.doPlayStop = function() {
  var p = Playa.__getPlaya();
  if (p != null) {
    p.SetVariable("Request_command", "PlayStop");
  }
};

/**
  * Starts playing, if the playback is stopped
  * @public
  */
Playa.doPlay = function() {
  var p = Playa.__getPlaya();
  if (p != null) {
    p.SetVariable("Request_command", "Play");
  }
};

/**
  * Stops playback if it's playing
  * @public
  */
Playa.doStop = function() {
  var p = Playa.__getPlaya();
  if (p != null) {
    p.SetVariable("Request_command", "Stop");
  }
};

/**
  * Fire this event when user press the next button
  * @public
  */
Playa.doNext = function() {
  var p = Playa.__getPlaya();
  if (p != null) {
    p.SetVariable("Request_command", "Next");
  }
};

/**
  * Fire this event when user press the prev button
  * @public
  */
Playa.doPrev = function() {
  var p = Playa.__getPlaya();
  if (p != null) {
    p.SetVariable("Request_command", "Prev");
  }
};

/**
  * Plays a file.
  * @param    url    String
  * @public
  */
Playa.doPlayUrl = function(sUrl) {
  var p = Playa.__getPlaya();
  
  if (p != null) {
    p.SetVariable("Request_args", sUrl);
    p.SetVariable("Request_command", "PlayUrl");
  }
  Playa.surl = sUrl;
};

/**
  * Jumps to a position in the playlist.
  * @param    index    Integer
  * @public
  */
Playa.doJump = function(nIndex) {
  var p = Playa.__getPlaya();
  if (p != null) {
    p.SetVariable("Request_args", "" + nIndex);
    p.SetVariable("Request_command", "PlayPosition");
  }
};


/*** Start processing */
Event.observe(window, 'load', function (e) { Try.these( function() { Playa.start(); }) }, false);