(function(window) {

	var SegmentParser = window.videojs.hls.SegmentParser;

	window.videojs.hls.SegmentController = function(){

		var self = this;
		var url;
		var parser;
		var requestTimestamp;
		var responseTimestamp;
		var data;

		var onDataCallback;
		var onErrorCallback;
		var onUpdateCallback;

		self.loadSegment = function ( segmentUrl, onDataCallback, onErrorCallback, onUpdateCallback ) {
			self.url = segmentUrl;
			self.onDataCallback = onDataCallback;
			self.onErrorCallback = onErrorCallback;
			self.onUpdateCallback = onUpdateCallback;
			self.requestTimestamp = new Date().getTime();

			vjs.get(segmentUrl, self.onSegmentLoadComplete, self.onSegmentLoadError);
		};

		self.parseSegment = function ( incomingData ) {
			// Add David's code later //

			self.data = {};
			self.data.url = self.url;
			self.data.isCached = false;
			self.data.requestTimestamp = self.requestTimestamp;
			self.data.responseTimestamp = self.responseTimestamp;
			self.data.byteLength = incomingData.byteLength;
			self.data.isCached = ( parseInt(self.responseTimestamp - self.requestTimestamp) < 75 );
			self.data.throughput = self.calculateThroughput(self.data.byteLength, self.requestTimestamp ,self.responseTimestamp)

			return self.data;
		};

		self.calculateThroughput = function(dataAmount, startTime, endTime) {
			return Math.round(dataAmount/(endTime-startTime)*1000)*8;
		}

		self.onSegmentLoadComplete = function(response) {
			self.responseTimestamp = new Date().getTime();

			var output = self.parseSegment(response);

			if(self.onDataCallback != undefined)
			{
				self.onDataCallback(output);
			}
		};

		self.onSegmentLoadError = function(err) {
			if(err)
			{
				console.log(err.message);
			}

			if(self.onErrorCallback != undefined)
			{
				onErrorCallback((err != undefined) ? err : null);
			}
		};
	}
})(this);