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
{
    public static class FixedLineLength
    {
        #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();
        static string icon = Application.StartupPath + "\\Info.bmp";
        //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);
                }
                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 dll file
        /// </summary>
        public static string DllName { set; get; }

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

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

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

        static FixedLineLength()
        {
            SetDllInfo();
        }

        /// <summary>
        /// Formats a string with a fixed line length.
        /// </summary>
        /// <param name="text">String to be formatted.</param>
        /// <param name="lineLenght">Maximum line length</param>
        /// <returns></returns>
        public static string Format(string text, int lineLenght)
        {
            int pos = 0;
            int spacePos = 0;
            string character = "";
            string temp = "";
            string result = "";

            while (text.Length > 0)
            {
                if (text.Length <= lineLenght)
                {
                    result = String.Concat(result, text);
                    text = "";
                }
                else
                {
                    while (pos <= lineLenght)
                    {
                        character = text.Remove(0, pos).Remove(1);

                        //Bei einem Zeilenumbruch oder Wagenrücklauf eine neu Zeile beginnen
                        if (character == "\n" || character == "\r")
                        {
                            spacePos = text.IndexOf("\n") + 1;
                            break;
                        }

                        if (character == " " || character == "\\")
                        {
                            spacePos = pos + 1;
                        }

                        pos++;
                    }

                    if (spacePos - 1 > 0)
                    {
                        temp = text.Remove(spacePos);
                        if (temp.EndsWith(" "))
                        {
                            temp = temp.Remove(spacePos - 1);
                        }
                    }

                    if (temp.EndsWith("\n") || temp.EndsWith("\r"))
                    {
                        while (temp.EndsWith("\n") || temp.EndsWith("\r"))
                        {
                            temp = temp.Remove(temp.Length - 1);// Ein schon enthaltenes '\n' oder '\r' am Ende des temporären Strings muss entfernt werden
                        }
                    }
                    text = text.Remove(0, spacePos);
                    result = String.Concat(result, temp, "\r\n");
                    pos = 0;
                    spacePos = 0;
                }
            }

            return result;
        }
    }
}