Remaining time estimate

Core/Utility/TimeInProgressEstimater.cs

@@ -0,0 +1,53 @@
+using System;
+using System.Collections.Generic;
+using LeafWeb.Core.Entities;
+using MathNet.Numerics;
+
+namespace LeafWeb.Core.Utility
+{
+	public class TimeInProgressEstimater
+	{
+		private readonly double[] _xData;
+		private readonly double[] _yData;
+
+		public TimeInProgressEstimater(IEnumerable<ILeafInput> leafInputs)
+		{
+			var xData = new List<double>();
+			var yData = new List<double>();
+			foreach (var leafInput in leafInputs)
+			{
+				xData.Add(leafInput.InputFiles.Count);
+				yData.Add(ConvertFromTimeSpan(leafInput.TimeInProgress));
+			}
+			_xData = xData.ToArray();
+			_yData = yData.ToArray();
+		}
+
+		public TimeSpan EstimateTimeInProgress(ILeafInput leafInput)
+		{
+			//var lineFunc = Fit.LineFunc(_xData, _yData);
+			var lineFunc = Fit.PolynomialFunc(_xData, _yData, 3);
+			var estimate = lineFunc(leafInput.InputFiles.Count);
+			return ConvertToTimeSpan(estimate);
+		}
+
+		private static double ConvertFromTimeSpan(TimeSpan timeSpan)
+		{
+			return timeSpan.TotalSeconds;
+		}
+
+		private static TimeSpan ConvertToTimeSpan(double estimate)
+		{
+			int int32;
+			try
+			{
+				int32 = Convert.ToInt32(estimate);
+			}
+			catch (OverflowException)
+			{
+				int32 = int.MaxValue;
+			}
+			return TimeSpan.FromSeconds(int32);
+		}
+	}
+}