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+/*!
+ * Ext JS Library 3.0.0
+ * Copyright(c) 2006-2009 Ext JS, LLC
+ * licensing@extjs.com
+ * http://www.extjs.com/license
+ */
+/*
+	Speed Plug-in
+	
+	Features:
+		*Adds several properties to the 'file' object indicated upload speed, time left, upload time, etc.
+			- currentSpeed -- String indicating the upload speed, bytes per second
+			- averageSpeed -- Overall average upload speed, bytes per second
+			- movingAverageSpeed -- Speed over averaged over the last several measurements, bytes per second
+			- timeRemaining -- Estimated remaining upload time in seconds
+			- timeElapsed -- Number of seconds passed for this upload
+			- percentUploaded -- Percentage of the file uploaded (0 to 100)
+			- sizeUploaded -- Formatted size uploaded so far, bytes
+		
+		*Adds setting 'moving_average_history_size' for defining the window size used to calculate the moving average speed.
+		
+		*Adds several Formatting functions for formatting that values provided on the file object.
+			- SWFUpload.speed.formatBPS(bps) -- outputs string formatted in the best units (Gbps, Mbps, Kbps, bps)
+			- SWFUpload.speed.formatTime(seconds) -- outputs string formatted in the best units (x Hr y M z S)
+			- SWFUpload.speed.formatSize(bytes) -- outputs string formatted in the best units (w GB x MB y KB z B )
+			- SWFUpload.speed.formatPercent(percent) -- outputs string formatted with a percent sign (x.xx %)
+			- SWFUpload.speed.formatUnits(baseNumber, divisionArray, unitLabelArray, fractionalBoolean)
+				- Formats a number using the division array to determine how to apply the labels in the Label Array
+				- factionalBoolean indicates whether the number should be returned as a single fractional number with a unit (speed)
+				    or as several numbers labeled with units (time)
+	*/
+
+var SWFUpload;
+if (typeof(SWFUpload) === "function") {
+	SWFUpload.speed = {};
+	
+	SWFUpload.prototype.initSettings = (function (oldInitSettings) {
+		return function () {
+			if (typeof(oldInitSettings) === "function") {
+				oldInitSettings.call(this);
+			}
+			
+			this.ensureDefault = function (settingName, defaultValue) {
+				this.settings[settingName] = (this.settings[settingName] == undefined) ? defaultValue : this.settings[settingName];
+			};
+
+			// List used to keep the speed stats for the files we are tracking
+			this.fileSpeedStats = {};
+			this.speedSettings = {};
+
+			this.ensureDefault("moving_average_history_size", "10");
+			
+			this.speedSettings.user_file_queued_handler = this.settings.file_queued_handler;
+			this.speedSettings.user_file_queue_error_handler = this.settings.file_queue_error_handler;
+			this.speedSettings.user_upload_start_handler = this.settings.upload_start_handler;
+			this.speedSettings.user_upload_error_handler = this.settings.upload_error_handler;
+			this.speedSettings.user_upload_progress_handler = this.settings.upload_progress_handler;
+			this.speedSettings.user_upload_success_handler = this.settings.upload_success_handler;
+			this.speedSettings.user_upload_complete_handler = this.settings.upload_complete_handler;
+			
+			this.settings.file_queued_handler = SWFUpload.speed.fileQueuedHandler;
+			this.settings.file_queue_error_handler = SWFUpload.speed.fileQueueErrorHandler;
+			this.settings.upload_start_handler = SWFUpload.speed.uploadStartHandler;
+			this.settings.upload_error_handler = SWFUpload.speed.uploadErrorHandler;
+			this.settings.upload_progress_handler = SWFUpload.speed.uploadProgressHandler;
+			this.settings.upload_success_handler = SWFUpload.speed.uploadSuccessHandler;
+			this.settings.upload_complete_handler = SWFUpload.speed.uploadCompleteHandler;
+			
+			delete this.ensureDefault;
+		};
+	})(SWFUpload.prototype.initSettings);
+
+	
+	SWFUpload.speed.fileQueuedHandler = function (file) {
+		if (typeof this.speedSettings.user_file_queued_handler === "function") {
+			file = SWFUpload.speed.extendFile(file);
+			
+			return this.speedSettings.user_file_queued_handler.call(this, file);
+		}
+	};
+	
+	SWFUpload.speed.fileQueueErrorHandler = function (file, errorCode, message) {
+		if (typeof this.speedSettings.user_file_queue_error_handler === "function") {
+			file = SWFUpload.speed.extendFile(file);
+			
+			return this.speedSettings.user_file_queue_error_handler.call(this, file, errorCode, message);
+		}
+	};
+
+	SWFUpload.speed.uploadStartHandler = function (file) {
+		if (typeof this.speedSettings.user_upload_start_handler === "function") {
+			file = SWFUpload.speed.extendFile(file, this.fileSpeedStats);
+			return this.speedSettings.user_upload_start_handler.call(this, file);
+		}
+	};
+	
+	SWFUpload.speed.uploadErrorHandler = function (file, errorCode, message) {
+		file = SWFUpload.speed.extendFile(file, this.fileSpeedStats);
+		SWFUpload.speed.removeTracking(file, this.fileSpeedStats);
+
+		if (typeof this.speedSettings.user_upload_error_handler === "function") {
+			return this.speedSettings.user_upload_error_handler.call(this, file, errorCode, message);
+		}
+	};
+	SWFUpload.speed.uploadProgressHandler = function (file, bytesComplete, bytesTotal) {
+		this.updateTracking(file, bytesComplete);
+		file = SWFUpload.speed.extendFile(file, this.fileSpeedStats);
+
+		if (typeof this.speedSettings.user_upload_progress_handler === "function") {
+			return this.speedSettings.user_upload_progress_handler.call(this, file, bytesComplete, bytesTotal);
+		}
+	};
+	
+	SWFUpload.speed.uploadSuccessHandler = function (file, serverData) {
+		if (typeof this.speedSettings.user_upload_success_handler === "function") {
+			file = SWFUpload.speed.extendFile(file, this.fileSpeedStats);
+			return this.speedSettings.user_upload_success_handler.call(this, file, serverData);
+		}
+	};
+	SWFUpload.speed.uploadCompleteHandler = function (file) {
+		file = SWFUpload.speed.extendFile(file, this.fileSpeedStats);
+		SWFUpload.speed.removeTracking(file, this.fileSpeedStats);
+
+		if (typeof this.speedSettings.user_upload_complete_handler === "function") {
+			return this.speedSettings.user_upload_complete_handler.call(this, file);
+		}
+	};
+	
+	// Private: extends the file object with the speed plugin values
+	SWFUpload.speed.extendFile = function (file, trackingList) {
+		var tracking;
+		
+		if (trackingList) {
+			tracking = trackingList[file.id];
+		}
+		
+		if (tracking) {
+			file.currentSpeed = tracking.currentSpeed;
+			file.averageSpeed = tracking.averageSpeed;
+			file.movingAverageSpeed = tracking.movingAverageSpeed;
+			file.timeRemaining = tracking.timeRemaining;
+			file.timeElapsed = tracking.timeElapsed;
+			file.percentUploaded = tracking.percentUploaded;
+			file.sizeUploaded = tracking.bytesUploaded;
+
+		} else {
+			file.currentSpeed = 0;
+			file.averageSpeed = 0;
+			file.movingAverageSpeed = 0;
+			file.timeRemaining = 0;
+			file.timeElapsed = 0;
+			file.percentUploaded = 0;
+			file.sizeUploaded = 0;
+		}
+		
+		return file;
+	};
+	
+	// Private: Updates the speed tracking object, or creates it if necessary
+	SWFUpload.prototype.updateTracking = function (file, bytesUploaded) {
+		var tracking = this.fileSpeedStats[file.id];
+		if (!tracking) {
+			this.fileSpeedStats[file.id] = tracking = {};
+		}
+		
+		// Sanity check inputs
+		bytesUploaded = bytesUploaded || tracking.bytesUploaded || 0;
+		if (bytesUploaded < 0) {
+			bytesUploaded = 0;
+		}
+		if (bytesUploaded > file.size) {
+			bytesUploaded = file.size;
+		}
+		
+		var tickTime = (new Date()).getTime();
+		if (!tracking.startTime) {
+			tracking.startTime = (new Date()).getTime();
+			tracking.lastTime = tracking.startTime;
+			tracking.currentSpeed = 0;
+			tracking.averageSpeed = 0;
+			tracking.movingAverageSpeed = 0;
+			tracking.movingAverageHistory = [];
+			tracking.timeRemaining = 0;
+			tracking.timeElapsed = 0;
+			tracking.percentUploaded = bytesUploaded / file.size;
+			tracking.bytesUploaded = bytesUploaded;
+		} else if (tracking.startTime > tickTime) {
+			this.debug("When backwards in time");
+		} else {
+			// Get time and deltas
+			var now = (new Date()).getTime();
+			var lastTime = tracking.lastTime;
+			var deltaTime = now - lastTime;
+			var deltaBytes = bytesUploaded - tracking.bytesUploaded;
+			
+			if (deltaBytes === 0 || deltaTime === 0) {
+				return tracking;
+			}
+			
+			// Update tracking object
+			tracking.lastTime = now;
+			tracking.bytesUploaded = bytesUploaded;
+			
+			// Calculate speeds
+			tracking.currentSpeed = (deltaBytes * 8 ) / (deltaTime / 1000);
+			tracking.averageSpeed = (tracking.bytesUploaded * 8) / ((now - tracking.startTime) / 1000);
+
+			// Calculate moving average
+			tracking.movingAverageHistory.push(tracking.currentSpeed);
+			if (tracking.movingAverageHistory.length > this.settings.moving_average_history_size) {
+				tracking.movingAverageHistory.shift();
+			}
+			
+			tracking.movingAverageSpeed = SWFUpload.speed.calculateMovingAverage(tracking.movingAverageHistory);
+			
+			// Update times
+			tracking.timeRemaining = (file.size - tracking.bytesUploaded) * 8 / tracking.movingAverageSpeed;
+			tracking.timeElapsed = (now - tracking.startTime) / 1000;
+			
+			// Update percent
+			tracking.percentUploaded = (tracking.bytesUploaded / file.size * 100);
+		}
+		
+		return tracking;
+	};
+	SWFUpload.speed.removeTracking = function (file, trackingList) {
+		try {
+			trackingList[file.id] = null;
+			delete trackingList[file.id];
+		} catch (ex) {
+		}
+	};
+	
+	SWFUpload.speed.formatUnits = function (baseNumber, unitDivisors, unitLabels, singleFractional) {
+		var i, unit, unitDivisor, unitLabel;
+
+		if (baseNumber === 0) {
+			return "0 " + unitLabels[unitLabels.length - 1];
+		}
+		
+		if (singleFractional) {
+			unit = baseNumber;
+			unitLabel = unitLabels.length >= unitDivisors.length ? unitLabels[unitDivisors.length - 1] : "";
+			for (i = 0; i < unitDivisors.length; i++) {
+				if (baseNumber >= unitDivisors[i]) {
+					unit = (baseNumber / unitDivisors[i]).toFixed(2);
+					unitLabel = unitLabels.length >= i ? " " + unitLabels[i] : "";
+					break;
+				}
+			}
+			
+			return unit + unitLabel;
+		} else {
+			var formattedStrings = [];
+			var remainder = baseNumber;
+			
+			for (i = 0; i < unitDivisors.length; i++) {
+				unitDivisor = unitDivisors[i];
+				unitLabel = unitLabels.length > i ? " " + unitLabels[i] : "";
+				
+				unit = remainder / unitDivisor;
+				if (i < unitDivisors.length -1) {
+					unit = Math.floor(unit);
+				} else {
+					unit = unit.toFixed(2);
+				}
+				if (unit > 0) {
+					remainder = remainder % unitDivisor;
+					
+					formattedStrings.push(unit + unitLabel);
+				}
+			}
+			
+			return formattedStrings.join(" ");
+		}
+	};
+	
+	SWFUpload.speed.formatBPS = function (baseNumber) {
+		var bpsUnits = [1073741824, 1048576, 1024, 1], bpsUnitLabels = ["Gbps", "Mbps", "Kbps", "bps"];
+		return SWFUpload.speed.formatUnits(baseNumber, bpsUnits, bpsUnitLabels, true);
+	
+	};
+	SWFUpload.speed.formatTime = function (baseNumber) {
+		var timeUnits = [86400, 3600, 60, 1], timeUnitLabels = ["d", "h", "m", "s"];
+		return SWFUpload.speed.formatUnits(baseNumber, timeUnits, timeUnitLabels, false);
+	
+	};
+	SWFUpload.speed.formatBytes = function (baseNumber) {
+		var sizeUnits = [1073741824, 1048576, 1024, 1], sizeUnitLabels = ["GB", "MB", "KB", "bytes"];
+		return SWFUpload.speed.formatUnits(baseNumber, sizeUnits, sizeUnitLabels, true);
+	
+	};
+	SWFUpload.speed.formatPercent = function (baseNumber) {
+		return baseNumber.toFixed(2) + " %";
+	};
+	
+	SWFUpload.speed.calculateMovingAverage = function (history) {
+		var vals = [], size, sum = 0.0, mean = 0.0, varianceTemp = 0.0, variance = 0.0, standardDev = 0.0;
+		var i;
+		var mSum = 0, mCount = 0;
+		
+		size = history.length;
+		
+		// Check for sufficient data
+		if (size >= 8) {
+			// Clone the array and Calculate sum of the values 
+			for (i = 0; i < size; i++) {
+				vals[i] = history[i];
+				sum += vals[i];
+			}
+
+			mean = sum / size;
+
+			// Calculate variance for the set
+			for (i = 0; i < size; i++) {
+				varianceTemp += Math.pow((vals[i] - mean), 2);
+			}
+
+			variance = varianceTemp / size;
+			standardDev = Math.sqrt(variance);
+			
+			//Standardize the Data
+			for (i = 0; i < size; i++) {
+				vals[i] = (vals[i] - mean) / standardDev;
+			}
+
+			// Calculate the average excluding outliers
+			var deviationRange = 2.0;
+			for (i = 0; i < size; i++) {
+				
+				if (vals[i] <= deviationRange && vals[i] >= -deviationRange) {
+					mCount++;
+					mSum += history[i];
+				}
+			}
+			
+		} else {
+			// Calculate the average (not enough data points to remove outliers)
+			mCount = size;
+			for (i = 0; i < size; i++) {
+				mSum += history[i];
+			}
+		}
+
+		return mSum / mCount;
+	};
+	
+}
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