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/*
 * Some experimenting with linq perforamnce inspired by http://tiredblogger.wordpress.com/2008/07/25/iqueryable-methods-on-activereports-controlcollections/ .
 * Author: Scott Willeke, http://blog.scott.willeke.com, scott at willeke dot com
 * 
 */
using System;
using System.Collections.Generic;
using System.Linq;


namespace LinqWithCollections
{
	class Program
	{
		List<Label> _controlsSimpleList;
		IQueryable<Label> _controlsQueryable;
		List<Indicator> _indicators;
		private bool IsSpanish;
		const int TestIterationCount = 10;
		const int indicatorCount = 400;
		
		static void Main()
		{
			Program p = new Program();
			p.CreateSampleData();
			TimeTest(p.NoLinqTest);
			TimeTest(p.WithLinqExtensionMethods); 
			TimeTest(p.WithLinqQueryable);
			Console.ReadLine();
		}

		private void WithLinqQueryable()
		{
			var foundCount = 0;
			foreach (var indicator in _indicators)
			{
				var indicatorHeader = string.Format("i{0}", indicator.Id);
				var indicatorControl = _controlsQueryable.SingleOrDefault(x => x.Name == indicatorHeader);
				if (indicatorControl != null)
				{
					foundCount++;
					indicatorControl.Text = IsSpanish
						? indicator.SpanishText
						: indicator.EnglishText;
				}
			}
			if (foundCount != indicatorCount/2)
				throw new InvalidOperationException("invalid foundCount");
		}

		private void WithLinqExtensionMethods()
		{
			var foundCount = 0;
			foreach (var indicator in _indicators)
			{
				var indicatorHeader = string.Format("i{0}", indicator.Id);
				var indicatorControl = _controlsSimpleList.SingleOrDefault(x => x.Name == indicatorHeader);
				if (indicatorControl != null)
				{
					foundCount++;
					indicatorControl.Text = IsSpanish
						? indicator.SpanishText
						: indicator.EnglishText;
				}
			}
			if (foundCount != indicatorCount / 2)
				throw new InvalidOperationException("invalid foundCount");
		}

		private void NoLinqTest()
		{
			var controlLookup = new Dictionary<string, Label>();
			_controlsSimpleList.ForEach(x => controlLookup[x.Name] = x);

			var foundCount = 0;
			foreach (var indicator in _indicators)
			{
				var indicatorHeader = string.Format("i{0}", indicator.Id);
				Label indicatorControl;
				if (controlLookup.TryGetValue(indicatorHeader, out indicatorControl))
				{
					foundCount++;
					indicatorControl.Text = IsSpanish
						? indicator.SpanishText
						: indicator.EnglishText;
				}
			}
			if (foundCount != indicatorCount/2)
				throw new InvalidOperationException("invalid foundCount");
		}

		#region Helper Methods
		private static void TimeTest(Action testMethod)
		{
			var testName = testMethod.Method.Name;
			using (new TimerX(testName))
			{
				for (var i = 0; i < TestIterationCount; i++)
				{
					testMethod();
				}
			}
		}

		private void CreateSampleData()
		{
			_indicators = new List<Indicator>();
			for (var i = 0; i < indicatorCount; i++)
			{
				_indicators.Add(new Indicator(i));
			}
			_controlsSimpleList = new List<Label>();
			for (var i = 0; i < indicatorCount; i = i + 2)
			{
				_controlsSimpleList.Add(new Label(i));
			}
			_controlsQueryable = _controlsSimpleList.AsQueryable();
		}
		#endregion
	}

	#region Helper Classes
	internal class TimerX : IDisposable
	{
		private DateTime _startTime;
		private DateTime _stopTime;
		private readonly string _label;

		public TimerX(string label)
		{
			_label = label;
			Start();
		}

		private void Start()
		{
			_startTime = DateTime.Now;
		}

		public void Stop()
		{
			_stopTime = DateTime.Now;
		}

		void IDisposable.Dispose()
		{
			Stop();
			Trace();
		}

		private void Trace()
		{
			var msg = _label + ": " + (_stopTime - _startTime).TotalMilliseconds + " ms";
			Console.WriteLine(msg);
		}
	}
	
	internal class Label
	{
		public Label(int i)
		{
			this.Name = "i" + i;
			this.Text = "text" + i;
		}

		public string Name;
		public string Text;
	}

	internal class Indicator
	{
		public int Id;
		public string SpanishText;
		public string EnglishText;

		public Indicator(int i)
		{
			this.Id = i;
			this.SpanishText = "spanish" + i;
			this.EnglishText = "english" + i;
		}
	}
	#endregion
}