using System;
using System.Collections.Generic;
using System.IO;
using System.Runtime.InteropServices;
using System.Text;

namespace RVIO
{
    [Flags]
    [ComVisible(true)]
    [Serializable]
    public enum FileAttributes
    {
        ReadOnly = 1,
        Hidden = 2,
        System = 4,
        Directory = 16,
        Archive = 32,
        Device = 64,
        Normal = 128,
        Temporary = 256,
        SparseFile = 512,
        ReparsePoint = 1024,
        Compressed = 2048,
        Offline = 4096,
        NotContentIndexed = 8192,
        Encrypted = 16384,
    }
    public static class Error
    {
        public static int GetLastError()
        {
            return Marshal.GetLastWin32Error();
        }
    }

    public static class Unix
    {
        public static bool IsUnix
        {
            get
            {
                int p = (int)Environment.OSVersion.Platform;
                return ((p == 4) || (p == 6) || (p == 128));
            }
        }
    }

    public class FileInfo
    {
        public string Name;
        public string FullName;
        public long LastWriteTime;
        public long LastAccessTime;
        public long CreationTime;
        public long Length;

        public FileInfo(string name, string fullName)
        {
            Name = name;
            FullName = fullName;
        }

        public FileInfo(string path)
        {
            FullName = path;
            Name = Path.GetFileName(path);

            System.IO.FileInfo fi = new System.IO.FileInfo(NameFix.AddLongPathPrefix(path));

            if (!fi.Exists) return;

            Length = fi.Length;
            try { LastWriteTime = fi.LastWriteTimeUtc.Ticks; } catch { LastWriteTime = 0; }
            try { LastAccessTime = fi.LastAccessTimeUtc.Ticks; } catch { LastAccessTime = 0; }
            try { CreationTime = fi.CreationTimeUtc.Ticks; } catch { CreationTime = 0; }
        }
    }

    public class DirectoryInfo
    {
        public string Name;
        public string FullName;
        public long LastWriteTime;
        public long LastAccessTime;
        public long CreationTime;

        public DirectoryInfo(string name, string fullName)
        {
            Name = name;
            FullName = fullName;
        }
        public DirectoryInfo(string path)
        {
            FullName = path;
            Name = Path.GetFileName(path);

            System.IO.DirectoryInfo fi = new System.IO.DirectoryInfo(NameFix.AddLongPathPrefix(path));

            if (!fi.Exists) return;

            try { LastWriteTime = fi.LastWriteTimeUtc.Ticks; } catch { LastWriteTime = 0; }
            try { LastAccessTime = fi.LastAccessTimeUtc.Ticks; } catch { LastAccessTime = 0; }
            try { CreationTime = fi.CreationTimeUtc.Ticks; } catch { CreationTime = 0; }
        }

        public DirectoryInfo[] GetDirectories()
        {
            List<DirectoryInfo> dirs = new List<DirectoryInfo>();

            try
            {
                System.IO.DirectoryInfo di = new System.IO.DirectoryInfo(NameFix.AddLongPathPrefix(FullName));
                if (!di.Exists)
                    return dirs.ToArray();

                System.IO.DirectoryInfo[] arrDi = di.GetDirectories();
                foreach (System.IO.DirectoryInfo tDi in arrDi)
                {
                    try
                    {
                        DirectoryInfo lDi = new DirectoryInfo(tDi.Name, Path.Combine(FullName, tDi.Name));
                        try { lDi.LastWriteTime = tDi.LastWriteTimeUtc.Ticks; } catch { lDi.LastWriteTime = 0; }
                        try { lDi.LastAccessTime = tDi.LastAccessTimeUtc.Ticks; } catch { lDi.LastAccessTime = 0; }
                        try { lDi.CreationTime = tDi.CreationTimeUtc.Ticks; } catch { lDi.CreationTime = 0; }

                        dirs.Add(lDi);
                    }
                    catch { }
                }
            }
            catch
            {

            }
            return dirs.ToArray();
        }

        public FileInfo[] GetFiles(string SearchPattern = "*")
        {
            List<FileInfo> files = new List<FileInfo>();

            try
            {
                System.IO.DirectoryInfo di = new System.IO.DirectoryInfo(NameFix.AddLongPathPrefix(FullName));
                if (!di.Exists)
                    return files.ToArray();

                System.IO.FileInfo[] arrDi = di.GetFiles(SearchPattern);
                foreach (System.IO.FileInfo tDi in arrDi)
                {
                    try
                    {
                        FileInfo lFi = new FileInfo(tDi.Name, Path.Combine(FullName, tDi.Name)) { Length = tDi.Length };
                        try { lFi.LastWriteTime = tDi.LastWriteTimeUtc.Ticks; } catch { lFi.LastWriteTime = 0; }
                        try { lFi.LastAccessTime = tDi.LastAccessTimeUtc.Ticks; } catch { lFi.LastAccessTime = 0; }
                        try { lFi.CreationTime = tDi.CreationTimeUtc.Ticks; } catch { lFi.CreationTime = 0; }

                        files.Add(lFi);
                    }
                    catch { }
                }
            }
            catch
            {
            }

            return files.ToArray();
        }
    }


    public static class Directory
    {
        public static bool Exists(string path)
        {
            return System.IO.Directory.Exists(NameFix.AddLongPathPrefix(path));
        }

        public static void Move(string sourceDirName, string destDirName)
        {
            System.IO.Directory.Move(NameFix.AddLongPathPrefix(sourceDirName), NameFix.AddLongPathPrefix(destDirName));
        }

        public static void Delete(string path)
        {
            System.IO.Directory.Delete(NameFix.AddLongPathPrefix(path));
        }

        public static void CreateDirectory(string path)
        {
            System.IO.Directory.CreateDirectory(NameFix.AddLongPathPrefix(path));
        }
    }

    public static class File
    {
        public static bool Exists(string path)
        {
            return System.IO.File.Exists(NameFix.AddLongPathPrefix(path));
        }
        public static void Copy(string sourceFileName, string destfileName)
        {
            Copy(sourceFileName, destfileName, true);
        }
        public static void Copy(string sourceFileName, string destFileName, bool overwrite)
        {
            System.IO.File.Copy(NameFix.AddLongPathPrefix(sourceFileName), NameFix.AddLongPathPrefix(destFileName), overwrite);
        }

        public static void Move(string sourceFileName, string destFileName)
        {
            System.IO.File.Move(NameFix.AddLongPathPrefix(sourceFileName), NameFix.AddLongPathPrefix(destFileName));

        }

        public static void Delete(string path)
        {
            System.IO.File.Delete(NameFix.AddLongPathPrefix(path));

        }

        public static void WriteAllBytes(string path, byte[] data)
        {
            System.IO.File.WriteAllBytes(NameFix.AddLongPathPrefix(path), data);
        }
        public static void WriteAllText(string path, string contents)
        {
            System.IO.File.WriteAllText(NameFix.AddLongPathPrefix(path), contents);
        }


        public static bool SetAttributes(string path, FileAttributes fileAttributes)
        {
            try
            {
                System.IO.File.SetAttributes(NameFix.AddLongPathPrefix(path), (System.IO.FileAttributes)fileAttributes);
                return true;
            }
            catch (Exception)
            {
                return false;
            }
        }

        public static StreamWriter? CreateText(string filename)
        {
            int errorCode = FileStream.OpenFileWrite(filename, out Stream? fStream);
            return errorCode != 0 ? null : new StreamWriter(fStream!);
        }
        public static StreamReader? OpenText(string filename, Encoding Enc)
        {
            int errorCode = FileStream.OpenFileRead(filename, out Stream? fStream);
            return errorCode != 0 ? null : new StreamReader(fStream!, Enc);
        }

        public static string ReadAllText(string filename)
        {
            return System.IO.File.ReadAllText(NameFix.AddLongPathPrefix(filename));
        }
        public static byte[] ReadAllBytes(string filename)
        {
            return System.IO.File.ReadAllBytes(NameFix.AddLongPathPrefix(filename));
        }
    }

    public static class Path
    {
        private const char DirectorySeparatorChar = '\\';
        private const char AltDirectorySeparatorChar = '/';
        private const char VolumeSeparatorChar = ':';

        public static char DirSeparatorChar
        {
            get { return Unix.IsUnix ? AltDirectorySeparatorChar : DirectorySeparatorChar; }
        }

        public static string FixSlash(string path)
        {
            return !Unix.IsUnix ? path : path.Replace(DirectorySeparatorChar, AltDirectorySeparatorChar);
        }

        public static string GetExtension(string path)
        {
            return System.IO.Path.GetExtension(path);
        }
        public static string Combine(string path1, string path2)
        {
            if (Unix.IsUnix)
                return System.IO.Path.Combine(path1, path2);

            if (path1 == null || path2 == null)
                throw new ArgumentNullException((path1 == null) ? "path1" : "path2");
            //CheckInvalidPathChars(path1);
            //CheckInvalidPathChars(path2);

            if (path2.Length == 0)
                return path1;

            if (path1.Length == 0)
                return path2;

            if (IsPathRooted(path2))
                return path2;

            char ch = path1[path1.Length - 1];
            if (ch != DirectorySeparatorChar && ch != AltDirectorySeparatorChar && ch != VolumeSeparatorChar)
                return path1 + DirectorySeparatorChar + path2;
            return path1 + path2;
        }
        private static bool IsPathRooted(string path)
        {
            if (path != null)
            {
                //CheckInvalidPathChars(path);

                int length = path.Length;
                if (
                    (length >= 1 && (path[0] == DirectorySeparatorChar || path[0] == AltDirectorySeparatorChar)) ||
                    (length >= 2 && path[1] == VolumeSeparatorChar)
                ) return true;
            }
            return false;
        }

        public static string GetFileNameWithoutExtension(string path)
        {
            return System.IO.Path.GetFileNameWithoutExtension(path);
        }

        public static string GetFileName(string path)
        {
            return System.IO.Path.GetFileName(path);
        }
        public static string? GetDirectoryName(string path)
        {
            return System.IO.Path.GetDirectoryName(path);

        }
    }


    public static class FileStream
    {
        public static Stream? OpenFileRead(string path, out int result)
        {
            result = OpenFileRead(path, out Stream? stream);
            return stream;
        }

        public static int OpenFileRead(string path, out Stream? stream)
        {
            try
            {
                stream = new System.IO.FileStream(NameFix.AddLongPathPrefix(path), FileMode.Open, FileAccess.Read);
                return 0;
            }
            catch (Exception e)
            {
                stream = null;
#if NET462_OR_GREATER || NETCOREAPP
                return e.HResult;
#else
                return -1;
#endif
            }
        }

        public static int OpenFileWrite(string path, out Stream? stream)
        {
            try
            {
                stream = new System.IO.FileStream(NameFix.AddLongPathPrefix(path), FileMode.Create, FileAccess.ReadWrite);
                return 0;
            }
            catch (Exception e)
            {
                stream = null;
#if NET462_OR_GREATER || NETCOREAPP
                return e.HResult;
#else
                return -1;
#endif
            }
        }
    }

    public static class NameFix
    {
        public static string AddLongPathPrefix(string path)
        {
            if (Unix.IsUnix)
                return path;

            if (string.IsNullOrEmpty(path) || path.StartsWith(@"\\?\"))
                return path;

            if (path.StartsWith(@"\\"))
                return @"\\?\UNC\" + path.Substring(2);

            string retPath = path;
            if (path.Substring(1, 1) != ":")
                retPath = Path.Combine(System.IO.Directory.GetCurrentDirectory(), retPath);

            retPath = CleanDots(retPath);

            return @"\\?\" + retPath;
        }

        private static string CleanDots(string path)
        {
            string retPath = path;
            while (retPath.Contains(@"\..\"))
            {
                int index = retPath.IndexOf(@"\..\");
                string path1 = retPath.Substring(0, index);
                string path2 = retPath.Substring(index + 4);

                int path1Back = path1.LastIndexOf(@"\");

                retPath = path1.Substring(0, path1Back + 1) + path2;
            }
            return retPath;

        }
    }
}