using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.VisualBasic;

namespace CircleViewer
{
    public class MinLogging
    {
        public string LoggerName = string.Empty;

        static string LogFile = @"CircleViewer.txt";
        static MinLogging()
        {
            try
            {
                LogFile = Path.Combine(Constants.CircleFolder, LogFile);
                if (File.Exists(LogFile))
                {
                    System.IO.FileInfo fi = new System.IO.FileInfo(LogFile);
                    if (fi.Length > 10000000) // don't let the log file get larger than 10MB
                    {
                        try
                        {
                            File.Delete(LogFile);
                        }
                        catch (Exception e)
                        {
                            Trace.WriteLine(e);
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                Trace.WriteLine(ex);
            }
        }

        public static void LogIt(string str)
        {
            try
            {
                // only log to file if THIS is the same or higher level of detail as my desired logging level
                str = string.Format("{0}|{1}|{2}", DateTime.Now, Thread.CurrentThread.ManagedThreadId, str);
                lock (LogFile)
                {
                    File.AppendAllText(LogFile, str + Environment.NewLine);
                    if (str.Length < 512)
                    {
                        byte[] data = Encoding.ASCII.GetBytes(str);
                    }
                    else
                    {
                        byte[] data = Encoding.ASCII.GetBytes(string.Format($"String to long. Length: {str.Length}"));
                    }
                }
            }
            catch (Exception ex)
            {
                Trace.WriteLine(ex);
            }
        }
    }
    public class LogMethod : IDisposable
    {
        private string _methodName;
        private Stopwatch _sw;

        /// <summary>
        /// Ctor now private - just called from the static Log method
        /// </summary>
        /// <param name="methodName">The name of the method being logged</param>
        private LogMethod(string methodName)
        {
            _methodName = methodName;
            _sw = new Stopwatch();
            _sw.Start();

            string msg = string.Format(">> Entering {0}", _methodName);
            MinLogging.LogIt(msg);
        }

        /// <summary>
        /// Tidy up
        /// </summary>
        public void Dispose()
        {
            _sw.Stop();
            string msg = string.Format("<< Exiting {0}: elapsed Time: {1} ms", _methodName, _sw.ElapsedMilliseconds);
            MinLogging.LogIt(msg);
        }

        public static IDisposable Log(string callingMethodTypeHardcode)
        {
            return new LogMethod(callingMethodTypeHardcode);
        }
    }
}