// must-have functions.
function isIPhone( ) {
	// test for iPhone and iPod Touch
	var iPhoneCheck = /iPhone|iPod/;
	var b_version=navigator.appVersion;
	
	return iPhoneCheck.test(b_version);
}

// general data container.
data = { 
	scrollFudgeFactor: isIPhone( ) ? 11 : -5
};

listener = new Listen();
serverProxy = new ServerProxy( "http://scramboni.com/Byteclub/component.op" );

function $(element) {
  if (arguments.length > 1) {
    for (var i = 0, elements = [], length = arguments.length; i < length; i++)
      elements.push($(arguments[i]));
    return elements;
  }

  if (typeof element == 'string')
    element = document.getElementById(element);

  return element;
};


/*
 * 
 */
AjaxUtils = new Object( );

AjaxUtils.toJSON = function(req) {
	try {
      var json = AjaxUtils.getHeader(req, 'X-JSON');
      return json ? eval('(' + json + ')') : null;
	} catch (e) { return null }
}

AjaxUtils.getHeader = function(req, name) {
    try {
      return req.getResponseHeader(name);
    } catch (e) { return null }
}

/*
 * 
 */
function Listen( ) {
	var url = "http://scramboni.com/Byteclub/listen.op";
	var watchdogTimerId = null;
	var shutdown = false;
	
	/*
	 * 
	 */
	function execute_listen( ) {
		if ( shutdown ) {
			return;
		}
		
		if ( watchdogTimerId != null ) {
			clearTimeout( watchdogTimerId );
		}
		watchdogTimerId = setTimeout( execute_listen, 35000 );
		AjaxRequest.post( {
		  url: url,
		  //timeout: 10000,
		  parameters: { qid: "$qid" },
		  onSuccess: function( transport ) {
				if ( transport.responseText != null )  {
					messages = eval( transport.responseText );
					if ( typeof messages == 'object' ) {
						for( var len = 0; len < messages.length; ++len ) {
							var hash = messages[len];
							try {
								//var script = hash['operation'] + "(" + JSON.stringify( hash ) + ")";
								var script = hash;
								eval( script );
							}
							catch( ex ) {
								//alert( "Exception while eval'ing [" + script + "]\n" + ex );
							}
						}
					}
				}
				// reschedule call again.
				setTimeout( execute_listen, 1000 );
			},
			
		  onError: function( transport ) {
			// reschedule call again.
			setTimeout( execute_listen, 1000 );
			},
		  onTimeout: function( transport ) {
			// reschedule call again.
			setTimeout( execute_listen, 1000 );
		  }
			
		});
	}

	/*
	 * 
	 */
	this.start = function( ) {
		execute_listen( );
	}
	
	this.stop = function( ) {
		if ( watchdogTimerId != null ) {
			clearTimeout( watchdogTimerId );
			watchdogTimerId = null;
		}
		shutdown = true;
	}
}

/*
 * Server rpc proxy object.
 */

function ServerProxy( url ) {
	var url = url;
	var timerId = null;
	
	this.send = function( args, onResultCallback ) {
		internal_send( args, onResultCallback );
	}
	
	function internal_send( args, onResultCallback ) {
		// cancel pending call if scheduled.
		if ( timerId !== null )  {
			clearTimeout( timerId );
			timerId = null;
		}
	
		AjaxRequest.post( {
		  url: url,
		  parameters: {json: JSON.stringify( args )},
		  onSuccess: function( transport ) {
		  	if ( typeof(onResultCallback) == "function") {
				onResultCallback( "ok", transport.responseText );
			}
		  },
		  onError: function( transport ) {
		  	if ( typeof(onResultCallback) == "function") {
				onResultCallback( "error", transport.responseText );
				return;
			}
			
			timerId = setTimeout( function( ) { internal_send( args, onResultCallback ); }, 500 ); 
		}

		});
	}
}


function forced_logout( args ) {
	if ( args.reason == "LOGGEDIN_ELSEWHERE" ) {
		listener.stop( );
		alert( "You logged in from a different location." );
		window.document.location = "http://scramboni.com/Byteclub/";
	}
}

function getCookie( cookieName ) {
	var results = document.cookie.match('(^|;) ?'+cookieName+'=([^;]*)(;|$)');
	return ( results ? unescape ( results[2] ) : null );
}

function setCookie( cookieName, cookieValue, expires, path ) {
	var cookieString = cookieName + "=" + cookieValue + ";";
	if ( expires ) {
		cookieString += " expires=" +  expires.toGMTString() + ";";
	}
	
	if ( path ) {
		cookieString += " path=" + path;
	}
	
	document.cookie = cookieString;
}