using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Security.Cryptography.X509Certificates;
using System.Text;
using System.Threading.Tasks;
using static System.Net.Mime.MediaTypeNames;

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

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

        private static DateTime Assembly_DateTime()
        {
            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 Current_Year()
        //{
        //    DateTime dtn = DateTime.Now;
        //    return dtn.Year.ToString();
        //}

        private static string Start_Year()
        {
            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 Generate_Copyright()
        {
            string startYear = Start_Year();
            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 Programm-Info
        /// <summary>
        /// Contains the name of the program file
        /// </summary>
        public static string ProgramName { set; get; }

        /// <summary>
        /// Contains the version of the program file
        /// </summary>
        public static string ProgramVersion { set; get; }

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

        private static void SetProgramInfo()
        {
            //Name, Version und Copyright setzen
            ProgramName = programName;
            ProgramVersion = programVersion;
            Copyright = copyright;
        }
        #endregion

        static void Main(string[] args)
        {
            // Programminformationen setzen
            SetProgramInfo();

            ////////////////////////////////////////////////////////////////
            //
            // TODO: Hier Programmcode einfügen
            string copyright = GenerateCopyright();
            string icon = Application.StartupPath + "\\Info.bmp";
            //Assembly Datum und Zeit
            static DateTime value = AssemblyDateTime();
            string date = value.ToShortDateString();
            string time = value.ToLongTimeString();


            
            //
            ////////////////////////////////////////////////////////////////
        }

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

            if (startYear == currentYear)
            {
                return copyright;
            }
            else
            {
                return copyright.Replace(startYear, String.Concat(startYear, "-", currentYear));
            }
        }

        //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 copyright)
        {
            //string startYear = ((AssemblyCopyrightAttribute)attributes[0]).Copyright;
            //return startYear.Remove(0, startYear.LastIndexOf(" ") + 1);
            string startYear = "";
            if (copyright.Contains("Copyright © "))
            {
                startYear = copyright.Replace("Copyright © ", "");
                while (startYear.StartsWith(" "))
                {
                    startYear = startYear.Remove(0, 1);
                }
                startYear = startYear.Remove(startYear.IndexOf(" "));
                return startYear;
            }
            else
            {
                DateTime dtn = DateTime.Now;
                return dtn.Year.ToString();
            }
        }
    }
}