/**
 * bit.ly access library code.
 */
var Shortener = new JS.Singleton('Shortener', {
	shorten: function() {
	  var uri, callback;
	  
	  if (typeof arguments[0] == 'string') {
	    uri      = arguments[0];
	    callback = arguments[1];
	  } else {
	    uri      = window.location.href;
	    callback = arguments[0];
	  }
    
		var name = this._registerCallback(callback);
		
		if (!(name && this.CLIENT)) return;
		
		this.CLIENT.call('shorten', {
			'longUrl': uri
		}, 'BitlyCB.' + name);
	},
	
	_dispatcher: function(callback, data) {
		var result;
		
	    // Results are keyed by longUrl, so we need to grab the first one.
	    for (var r in data.results) {
				result = data.results[r];
				break;
	    }
		
		callback(result, data);
	},
	
	_registerCallback: function(callback) {
	  if (!this.NAMESPACE) return false;
	  
		var name = 'abbr' + this.callbackCount;
		this.callbackCount += 1;
		
		this.NAMESPACE[name] = function(data) {
			this._dispatcher(callback, data);
		}.bind(this);
		
		return name;
	},
	
	callbackCount: 0,
	
	CLIENT:   BitlyClient || null,
  NAMESPACE:  BitlyCB     || null
});