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

namespace Eugen.ESystem.IO
{
    public class ReadFileLineByLine
    {
        #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();
        string icon = Application.StartupPath + "\\Info.bmp";
        //Assembly Datum und Zeit
        static DateTime value = AssemblyDateTime();
        string date = value.ToShortDateString();
        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);
                }
                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
            {
                return ((AssemblyCopyrightAttribute)attributes[0]).Copyright.Replace(startYear, String.Concat(startYear, "-", currentYear));
            }
        }
        #endregion

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

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

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

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

        /// <summary>
		/// Read a text file line by line and store each line in a list.
		/// </summary>
        static ReadFileLineByLine()
        {
            SetDllInfo(); //Name, Version und Copyright setzen
        }
        
        private void FileExist(string fileName)
        {
            //Wenn der Dateiname nicht existiert, dann eine Exception werfen
            if (!File.Exists(fileName))
            {
                throw new FileNotFoundException(fileName);
            }
        }

        /// <summary>
        /// Reads the specified file line by line
        /// </summary>
        /// <param name="fileName">A valid file name with full path.</param>
        /// <returns></returns>
        public static List<string> Read(string fileName)
        {
            List<string> lines = new List<string>();
            if (lines != null)
            {
                lines.Clear(); //Liste leeren
            }

            try
            {
                foreach (string line in File.ReadAllLines(fileName, Encoding.Default))
                {
                    lines.Add(line);
                }
            }
            catch
            {
                //Wenn nicht bis zum Ende gelesen werden kann, dann eine Exception werfen
                throw new CannotReadFileToEndException(fileName);
            }

            return lines;
        }
    }

    #region Exception
    public class CannotReadFileToEndException : ApplicationException
    {
        public CannotReadFileToEndException()
        { }

        public CannotReadFileToEndException(string message) : base(message)
        { }

        public CannotReadFileToEndException(string message, Exception inner) : base(message, inner)
        { }
    }
    #endregion
}