using System;
using System.Collections.Generic;
using System.Text;

namespace Volian.Base.Library
{
	/// <summary>
	/// VolianTimer Class - Times from Open to Close
	/// Stores the results in a static list
	/// </summary>
	public class VolianTimer
	{
#pragma warning disable S6669
        private static readonly log4net.ILog _MyLog = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
#pragma warning restore S6669
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Style", "IDE0044:Add readonly modifier", Justification = "Keeping Collections Not ReadOnly")]
        static List<VolianTimer> _Timers = new List<VolianTimer>();

        public string Name { get; set; }
        public DateTime Start { get; set; }
        public long Ticks { get; set; }
        public int Count { get; set; }
        /// <summary>
        /// Constructor
        /// </summary>
        public VolianTimer()
		{
			Count = 0;
			Ticks = 0;
		}
        /// <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>
        /// 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>
		/// 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();
		}
	}
}