/**
 * Cart Status Class
 * Retrieves trivial statistics from the current PHP session's MediaCart.
 * 
 **/
var CartStatus = new Class({ Implements: Options,
	options: {
		// The absolute url to request session information from
		requestURL: 'http://localhost/essentialradio/media-zip.php?act=status',
		// Function to run when AJAX data has been updated in the CartStatus object (bound as `this`).
		onComplete: function() {}
	},
	
	initialize: function(options)
	{
		this.mNumItems = 0; // number of items in cart
		this.mTotalFilesize = '0 B'; // filesize of cart contents (uncompressed)
		
		this.setOptions(options);
		this.options.onComplete = this.options.onComplete.bind(this);
		
		this.request = new Request.JSON(
		{
			'url': this.options.requestURL,
			
			onComplete: function(result)
			{
				if (result != null)
				{
					this.cartStatusObject.mNumItems = result.numItems;
					this.cartStatusObject.mTotalFilesize = result.totalFilesize;
					this.cartStatusObject.options.onComplete();
				}
				
				// break closure loop
				this.cartStatusObject.request = null;
				this.cartStatusObject = null;
				return;				
			}
		});
		this.request.cartStatusObject = this;
		this.request.get();
	}	
});