using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
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 partial class ReadFilesFromFolder : Form
    {
        #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();
        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);
                }

                if (startYear.Contains(" "))
                {
                    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 { 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

        /// <summary>
        /// Reads all files from a directory. Serves only to set the DLL information.
        /// </summary>
        static ReadFilesFromFolder()
        {
            SetDllInfo();
        }

        /// <summary>
        /// Reads all files from a directory.
        /// </summary>
        /// <param name="folder">A valid directory which is to be read out.</param>
        public ReadFilesFromFolder(string folder)
        {
            SetDllInfo();

            ClearFilesFound();

            try
            {
                FilesFound = ReadFiles(folder, "", "", false, false);
            }
            catch (Exception)
            {
                throw;
            }
        }

        /// <summary>
        /// Reads all files from a directory.
        /// </summary>
        /// <param name="folder">A valid directory which is to be read out.</param>
        /// <param name="extension">Files which have the specified extension will be returned.</param>
        public ReadFilesFromFolder(string folder, string extension)
        {
            SetDllInfo();

            ClearFilesFound();

            try
            {
                FilesFound = ReadFiles(folder, extension, "", false, false);
            }
            catch (Exception)
            {
                throw;
            }
        }

        /// <summary>
        /// Reads all files from a directory.
        /// </summary>
        /// <param name="folder">A valid directory which is to be read out.</param>
        /// <param name="pattern">Only files containing the specified pattern will be returned.</param>
        /// <param name="startsWithPattern">If the value is true, then the pattern is searched at the beginning of the directory name. Only 'startsWithPattern' or 'endsWithPattern' may be true, never both values.</param>
        /// <param name="endsWithPattern">If the value is true, then the pattern is searched at the end of the directory name.</param>
        public ReadFilesFromFolder(string folder, string pattern, bool startsWithPattern, bool endsWithPattern)
        {
            SetDllInfo();

            ClearFilesFound();

            try
            {
                FilesFound = ReadFiles(folder, "", pattern, startsWithPattern, endsWithPattern);
            }
            catch (Exception)
            {
                throw;
            }
        }

        /// <summary>
        /// Reads all files from a directory.
        /// </summary>
        /// <param name="folder">A valid directory which is to be read out.</param>
        /// <param name="extension">Files which have the specified extension will be returned.</param>
        /// <param name="pattern">Only files containing the specified pattern will be returned.</param>
        /// <param name="startsWithPattern">If the value is true, then the pattern is searched at the beginning of the directory name. Only 'startsWithPattern' or 'endsWithPattern' may be true, never both values.</param>
        /// <param name="endsWithPattern">If the value is true, then the pattern is searched at the end of the directory name.</param>
        public ReadFilesFromFolder(string folder, string extension, string pattern, bool startsWithPattern, bool endsWithPattern)
        {
            SetDllInfo();

            ClearFilesFound();

            try
            {
                FilesFound = ReadFiles(folder, extension, pattern, startsWithPattern, endsWithPattern);
            }
            catch (Exception)
            {
                throw;
            }
        }

        /// <summary>
        /// List of all found files.
        /// </summary>
        public List<string> FilesFound { private set; get; }

        private void ClearFilesFound()
        {
            if (FilesFound != null)
            {
                FilesFound.Clear(); //Liste löschen
            }
        }

        private List<string> ReadFiles(string folder, string extension, string pattern, bool startsWithPattern, bool endsWithPattern)
        {
            if (startsWithPattern & endsWithPattern)
            {
                throw new ArgumentException();
            }

            List<string> files = new List<string>();

            if (!Directory.Exists(folder))
            {
                throw new DirectoryNotFoundException();
            }
            else
            {
                //Alle Dateien einlesen
                foreach (var item in Directory.GetFiles(folder))
                {
                    //Prüfen ob 'extension' gestzt ist
                    if (String.IsNullOrEmpty(extension))
                    {
                        //Wenn keine 'extension' gesetzt ist, dann zur Liste hinzufügen
                        //Prüfen ob 'pattern' gesetzt ist
                        if (String.IsNullOrEmpty(pattern))
                        {
                            files.Add(item); //Wenn kein 'pattern' gesetzt ist, dann zur Liste hinzufügen
                        }
                        else
                        {
                            if (startsWithPattern && item.Remove(0, item.LastIndexOf("\\") + 1).StartsWith(pattern))
                            {
                                files.Add(item); //Wenn ein 'pattern' am Anfang gesetzt ist, dann zur List hinzufügen, wenn die Datei das 'pattern' enthält
                            }

                            if (endsWithPattern && item.Remove(0, item.LastIndexOf("\\")).EndsWith(pattern))
                            {
                                files.Add(item); //Wenn ein 'pattern' am Ende gesetzt ist, dann zur List hinzufügen, wenn die Datei das 'pattern' enthält
                            }

                            if ((!startsWithPattern & !endsWithPattern) & item.Remove(0, item.LastIndexOf("\\") + 1).Contains(pattern))
                            {
                                files.Add(item); //Wenn ein 'pattern' gesetzt ist, dann zur List hinzufügen, wenn die Datei das 'pattern' enthält
                            }
                        }
                    }
                    else
                    {
                        if (Path.GetExtension(item) == string.Concat(".", extension))
                        {
                            //Wenn eine 'extension' gesetzt ist und diese übereinstimmt, dann zur Liste hinzufügen
                            //Prüfen ob 'pattern' gesetzt ist
                            if (String.IsNullOrEmpty(pattern))
                            {
                                files.Add(item); //Wenn kein 'pattern' gesetzt ist, dann zur Liste hinzufügen
                            }
                            else
                            {
                                if (startsWithPattern && Path.GetFileName(item).Replace(Path.GetExtension(item), "").StartsWith(pattern))
                                {
                                    files.Add(item); //Wenn ein 'pattern' am Anfang gesetzt ist, dann zur List hinzufügen, wenn die Datei das 'pattern' enthält
                                }
                                
                                if (endsWithPattern && Path.GetFileName(item).Replace(Path.GetExtension(item), "").EndsWith(pattern))
                                {
                                    files.Add(item); //Wenn ein 'pattern' am Ende gesetzt ist, dann zur List hinzufügen, wenn die Datei das 'pattern' enthält
                                }

                                if ((!startsWithPattern & !endsWithPattern) & Path.GetFileName(item).Replace(Path.GetExtension(item), "").Contains(pattern))
                                {
                                    files.Add(item); //Wenn ein 'pattern' gesetzt ist, dann zur List hinzufügen, wenn die Datei das 'pattern' enthält
                                }
                            }
                        }
                    }
                }
            }

            return files;
        }
    }
}