using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Volian.Base.Library
{
	/// <summary>
	/// VolianTimer Class - Times from Open to Close
	/// Stores the results in a static list
	/// </summary>
	public class VolianTimer
	{
		private static readonly log4net.ILog _MyLog = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
		static List<VolianTimer> _Timers = new List<VolianTimer>();
		/// <summary>
		/// User defined name - should be as specific as possible 
		/// Include Method Name, File Name and Line Number
		/// </summary>
		private string _Name;
		public string Name
		{
			get { return _Name; }
			set { _Name = value; }
		}
		/// <summary>
		/// Set on open
		/// </summary>
		private DateTime _Start;
		public DateTime Start
		{
			get { return _Start; }
			set { _Start = value; }
		}
		/// <summary>
		/// Calculate on Close
		/// </summary>
		private long _Ticks;
		public long Ticks
		{
			get { return _Ticks; }
			set { _Ticks = value; }
		}
		/// <summary>
		/// Number of times open/close has been run
		/// </summary>
		private int _Count;
		public int Count
		{
			get { return _Count; }
			set { _Count = value; }
		}
		/// <summary>
		/// Constructor
		/// </summary>
		public VolianTimer()
		{
			Count = 0;
			Ticks = 0;
		}
		/// <summary>
		/// Command Line Parameter /Timing turns timing on
		/// </summary>
		private static bool? _TimingsOn = null;
		public static bool TimingsOn
		{
			get 
			{
				if (_TimingsOn == null)
					_TimingsOn = Volian.Base.Library.VlnSettings.GetCommandFlag("Timing");
				return (bool) _TimingsOn; 
			}
		}
		/// <summary>
		/// Constructor with Module and line number
		/// </summary>
		/// <param name="module">Method Name, File Name</param>
		/// <param name="line">Code Line Number</param>
		public VolianTimer(string module, int line)
		{
			Count = 0;
			Ticks = 0;
			Name = string.Format("{0}:{1}", module, line);
			if(TimingsOn) _Timers.Add(this);
		}
		/// <summary>
		/// Start Timer
		/// </summary>
		public void Open()
		{
			Start = DateTime.Now;
			Count++;
		}
		/// <summary>
		/// Stop Timer record statistics
		/// </summary>
		public void Close()
		{
			DateTime end = DateTime.Now;
			TimeSpan ts = TimeSpan.FromTicks(end.Ticks - Start.Ticks);
			Ticks += ts.Ticks;
		}
		/// <summary>
		/// Show the results in the error log
		/// </summary>
		/// <returns></returns>
		public static string ShowTimers()
		{
			StringBuilder sb = new StringBuilder();
			if (TimingsOn)
			{
				sb.AppendLine(
					"===============================================\r\n" +
					"Count\tSeconds\tEvent\r\n" +
					"----------------------------------------------- ");
				foreach (VolianTimer tmr in _Timers)
					sb.AppendLine(string.Format("{0}\t{1:N1}\t{2}", tmr.Count, TimeSpan.FromTicks(tmr.Ticks).TotalSeconds, tmr.Name));
				sb.AppendLine("===============================================\r\n");
				_MyLog.InfoFormat(sb.ToString());
			}
			return sb.ToString();
		}
	}
}