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

namespace Eugen.ESystem
{
    public class Time
    {
        #region Version und Copyright
        // Version und Copyright
        static string dllName = Path.GetFileNameWithoutExtension(System.Reflection.Assembly.GetExecutingAssembly().GetName().CodeBase); //Den Programmnamen auslesen
        static string dllVersion = System.Reflection.Assembly.GetExecutingAssembly().GetName().Version.ToString();
        static object[] attributes = Assembly.GetExecutingAssembly().GetCustomAttributes(typeof(AssemblyCopyrightAttribute), false);
        static string copyright = GenerateCopyright();

        //Assembly Datum und Zeit
        static DateTime value = AssemblyDateTime();
        static string date = value.ToShortDateString();
        static string time = value.ToLongTimeString();

        private static DateTime AssemblyDateTime()
        {
            var version = System.Reflection.Assembly.GetExecutingAssembly().GetName().Version;
            var buildDateTime = new DateTime(2000, 1, 1).Add(new TimeSpan(TimeSpan.TicksPerDay * version.Build + TimeSpan.TicksPerSecond * 2 * version.Revision));
            //Tage seit dem 1. Januar 2000 und Sekunden seit Mitternacht, (multiplizier mit 2 ergibt das Original)
            return buildDateTime;
        }

        private static string CurrentYear()
        {
            DateTime dtn = DateTime.Now;
            return dtn.Year.ToString();
        }

        private static string StartYear()
        {
            string startYear = "";
            if (((AssemblyCopyrightAttribute)attributes[0]).Copyright.Contains("Copyright © "))
            {
                startYear = ((AssemblyCopyrightAttribute)attributes[0]).Copyright.Replace("Copyright © ", "");
                while (startYear.StartsWith(" "))
                {
                    startYear = startYear.Remove(0, 1);
                }

                if (startYear.Contains("-"))
                {
                    startYear = startYear.Remove(startYear.IndexOf("-"));
                }
                else
                {
                    startYear = startYear.Remove(startYear.IndexOf(" "));
                }
                return startYear;
            }
            else
            {
                DateTime dtn = DateTime.Now;
                return dtn.Year.ToString();
            }
        }

        private static string GenerateCopyright()
        {
            string startYear = StartYear();
            string currentYear = CurrentYear();

            if (startYear == currentYear)
            {
                return ((AssemblyCopyrightAttribute)attributes[0]).Copyright;
            }
            else
            {
                string temp = ((AssemblyCopyrightAttribute)attributes[0]).Copyright;
                string start = temp.Remove(temp.IndexOf(startYear) - 1);
                string end = (temp.Remove(0, temp.IndexOf(" by")));

                return String.Concat(start, " ", startYear, "-", currentYear, end);
            }
        }
        #endregion

        #region DLL-Info
        /// <summary>
        /// Contains the name of the dll file.
        /// </summary>
        public static string DllName { private set; get; }

        /// <summary>
        /// Contains the version of the dll file.
        /// </summary>
        public static string DllVersion { private set; get; }

        /// <summary>
        /// Contains the copyright notice.
        /// </summary>
        public static string Copyright { private set; get; }

        /// <summary>
        /// Contains the name-, version- and copyright-information of the dll file.
        /// </summary>
        public static string[] DllInfo { private set; get; }

        private static void SetDllInfo()
        {
            //Name, Version und Copyright setzen
            DllName = dllName;
            DllVersion = dllVersion;
            Copyright = copyright;

            string[] dllInfo = new string[3];
            dllInfo[0] = dllName;
            dllInfo[1] = dllVersion;
            dllInfo[2] = copyright;
            DllInfo = dllInfo;
        }

        protected string ProgramName { private set; get; }
        protected string ProgramVersion { private set; get; }
        protected string ProgramCopyright { private set; get; }
        #endregion

        static Time()
        {
            SetDllInfo();
        }

        public Time()
        {
            SetDllInfo();
        }

        /// <summary>
        /// Write milliseconds or no
        /// </summary>
        public enum WriteMillisecond
        {
            Yes,
            No
        }

        private static string messageFormat = "{0:T}.{1}"; // Definiert das Mitteilungsformat

        /// <summary>
        /// Current day
        /// </summary>
        /// <returns>The current day</returns>
        public static string CurrentDay()
        {
            return DateTime.Now.ToString("dddd");
        }

        /// <summary>
        /// Current date
        /// </summary>
        /// <returns>The current date</returns>
        public static string CurrentDate()
        {
            return DateTime.Now.ToString("dd.MM.yyyy");
        }

        /// <summary>
        /// Current time
        /// </summary>
        /// <param name="choice">Write milliseconds or not</param>
        /// <returns>The current time</returns>
        public static string CurrentTime(WriteMillisecond choice)
        {
            if (choice == WriteMillisecond.Yes)
            {
                DateTime time = DateTime.Now;
                int ms = time.Millisecond;
                return String.Format(messageFormat, new object[] { time, ms.ToString("000") });
            }
            else
            {
                return DateTime.Now.ToString("hh:mm:ss");
            }
        }

        /// <summary>
        /// Current date and time
        /// </summary>
        /// <param name="choice">Write milliseconds or not</param>
        /// <returns>The current date and time</returns>
        public static string CurrentDateAndTime(WriteMillisecond choice)
        {
            if (choice == WriteMillisecond.Yes)
            {
                DateTime time = DateTime.Now;
                int ms = time.Millisecond;
                return String.Format(messageFormat, new object[] { time.ToString(), ms.ToString("000") });
            }
            else
            {
                return DateTime.Now.ToString();
            }
        }

        /// <summary>
        /// Current day, date and time
        /// </summary>
        /// <returns>The current day, date and time</returns>
        public static string CurrentDayDateTime()
        {
            return DateTime.Now.ToString("dddd, dd.MM.yyyy hh:mm:ss");
        }

        /// <summary>
        /// Stop watch
        /// </summary>
        public class StopWatch
        {
            private DateTime startTime;
            private DateTime endTime;

            /// <summary>
            /// Starts the stopwatch
            /// </summary>
            /// <returns>Returns the start time</returns>
            public string Start()
            {
                startTime = DateTime.Now;
                return startTime.ToString("yyyy-MM-dd HH:mm:ss.ms");
            }

            /// <summary>
            /// Stops the stopwatch
            /// </summary>
            /// <returns>Returns the stop time</returns>
            public string Stop()
            {
                endTime = DateTime.Now;
                return endTime.ToString("yyyy-MM-dd HH:mm:ss.ms");
            }

            /// <summary>
            /// The time difference
            /// </summary>
            /// <returns>Returns the time difference</returns>
            public string DurationTime()
            {
                if (startTime.ToString()!="01.01.0001 00:00:00" && startTime<=endTime)
                {
                    TimeSpan timeSpan = endTime.Subtract(startTime);
                    return String.Format("{0:00}D{1:00}:{2:00}:{3:00}.{4:000}", timeSpan.Days, timeSpan.Hours, timeSpan.Minutes, timeSpan.Seconds, timeSpan.Milliseconds);
                }
                else
                {
                    return String.Empty;
                }
            }
        }
    }
}