using System;

using System.Collections.Generic;

using System.Text;

using System.Diagnostics;

namespace Aga.Controls

{

	/// <summary>

	/// Is used to analyze code performance

	/// </summary>

	public static class PerformanceAnalyzer

	{

		public class PerformanceInfo

		{

			private string _name;

			public string Name

			{

				get { return _name; }

			}

			private int _count = 0;

			public int Count

			{

				get { return _count; }

				set { _count = value; }

			}

			private double _totalTime = 0;

			public double TotalTime

			{

				get { return _totalTime; }

				set { _totalTime = value; }

			}

			private Int64 _start;

			public Int64 Start

			{

				get { return _start; }

				set { _start = value; }

			}

			public PerformanceInfo(string name)

			{

				_name = name;

			}

		}

		private static Dictionary<string, PerformanceInfo> _performances = new Dictionary<string, PerformanceInfo>();

		public static IEnumerable<PerformanceInfo> Performances

		{

			get

			{

				return _performances.Values;

			}

		}

		[Conditional("DEBUG")]

		public static void Start(string pieceOfCode)

		{

			PerformanceInfo info = null;

			lock(_performances)

			{

				if (_performances.ContainsKey(pieceOfCode))

					info = _performances[pieceOfCode];

				else

				{

					info = new PerformanceInfo(pieceOfCode);

					_performances.Add(pieceOfCode, info);

				}

				info.Count++;

				info.Start = TimeCounter.GetStartValue();

			}

		}

		[Conditional("DEBUG")]

		public static void Finish(string pieceOfCode)

		{

			lock (_performances)

			{

				if (_performances.ContainsKey(pieceOfCode))

				{

					PerformanceInfo info = _performances[pieceOfCode];

					info.Count++;

					info.TotalTime += TimeCounter.Finish(info.Start);

				}

			}

		}

		public static void Reset()

		{

			_performances.Clear();

		}

		public static string GenerateReport()

		{

			return GenerateReport(0);

		}

		public static string GenerateReport(string mainPieceOfCode)

		{

			if (_performances.ContainsKey(mainPieceOfCode))

				return GenerateReport(_performances[mainPieceOfCode].TotalTime);

			else

				return GenerateReport(0);

		}

		public static string GenerateReport(double totalTime)

		{

			StringBuilder sb = new StringBuilder();

			int len = 0;

			foreach (PerformanceInfo info in Performances)

				len = Math.Max(info.Name.Length, len);

			sb.AppendLine("Name".PadRight(len) + " Count              Total Time, ms    Avg. Time, ms       Percentage, %");

			sb.AppendLine("----------------------------------------------------------------------------------------------");

			foreach (PerformanceInfo info in Performances)

			{

				sb.Append(info.Name.PadRight(len));

				double p = 0;

				double avgt = 0;

				if (totalTime != 0)

					p = info.TotalTime / totalTime;

				if (info.Count > 0)

					avgt = info.TotalTime * 1000 / info.Count;

				string c = info.Count.ToString("0,0").PadRight(20);

				string tt = (info.TotalTime * 1000).ToString("0,0.00").PadRight(20);

				string t = avgt.ToString("0.0000").PadRight(20);

				string sp = (p * 100).ToString("###").PadRight(20);

				sb.AppendFormat(" " + c + tt + t + sp + "\n");

			}

			return sb.ToString();

		}

	}

}