/*
    Tesses.VirtualFilesystem a library for virtual filesystems in .NET
    Copyright (C) 2023  Mike Nolan

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.
*/
using Zio;
using Zio.FileSystems;
using Tesses.VirtualFilesystem;
using System.Collections.Generic;
using System;
using System.IO;

namespace Tesses.VirtualFilesystem.Filesystems
{
    
    public class ZioFileSystem : SyncFileSystem
    {
        IFileSystem fs;
        public ZioFileSystem(IFileSystem fs)
        {
            this.fs = fs;
        }
        public UPath ConvertUPathFromUnixPath(UnixPath path)
        {
            return path.Path;
        }
        public UnixPath ConvertUPathToUnixPath(UPath path)
        {
            return new UnixPath(path.ToString());
        }
        public override void CreateDirectory(UnixPath directory)
        {
            fs.CreateDirectory(ConvertUPathFromUnixPath(directory));
        }

        public override void DeleteDirectory(UnixPath path)
        {
            fs.DeleteDirectory(ConvertUPathFromUnixPath(path),false);
        }

        public override void DeleteFile(UnixPath path)
        {
            fs.DeleteFile(ConvertUPathFromUnixPath(path));
        }

        public override bool DirectoryExists(UnixPath path)
        {
            return fs.DirectoryExists(ConvertUPathFromUnixPath(path));
        }

      

        public override bool FileExists(UnixPath path)
        {
            return fs.FileExists(ConvertUPathFromUnixPath(path));
        }

        public override DateTime GetCreationTime(UnixPath path)
        {
            return fs.GetCreationTime(ConvertUPathFromUnixPath(path));
        }

        public override DateTime GetLastAccessTime(UnixPath path)
        {
             return fs.GetLastAccessTime(ConvertUPathFromUnixPath(path));
        }

        public override DateTime GetLastWriteTime(UnixPath path)
        {
             return fs.GetLastWriteTime(ConvertUPathFromUnixPath(path));
        }

        public override void MoveDirectory(UnixPath src, UnixPath dest)
        {
            fs.MoveDirectory(ConvertUPathFromUnixPath(src),ConvertUPathFromUnixPath(dest));
        }

        public override void MoveFile(UnixPath src, UnixPath dest)
        {
            fs.MoveFile(ConvertUPathFromUnixPath(src),ConvertUPathFromUnixPath(dest));
        }

        public override Stream Open(UnixPath path, FileMode mode, FileAccess access, FileShare share)
        {
            return fs.OpenFile(ConvertUPathFromUnixPath(path),mode,access,share);
        }

        public override void SetCreationTime(UnixPath path, DateTime time)
        {
            fs.SetCreationTime(ConvertUPathFromUnixPath(path),time);
        }

        public override void SetLastAccessTime(UnixPath path, DateTime time)
        {
            fs.SetLastAccessTime(ConvertUPathFromUnixPath(path),time);
        }

        public override void SetLastWriteTime(UnixPath path, DateTime time)
        {
           fs.SetLastWriteTime(ConvertUPathFromUnixPath(path),time);
        }
        public override void SetAttributes(UnixPath path, FileAttributes attributes)
        {
           fs.SetAttributes(ConvertUPathFromUnixPath(path),attributes);
        }
        public override FileAttributes GetAttributes(UnixPath path)
        {
            return fs.GetAttributes(ConvertUPathFromUnixPath(path));
        }
        public override bool CanWatch(UnixPath path)
        {
            return fs.CanWatch(ConvertUPathFromUnixPath(path));
        }
        public override IVirtualWatcher WatchDirectory(UnixPath dir)
        {
            return new ZioWatcher(this,fs,dir);
        }

        public override IEnumerable<UnixPath> EnumerateFileSystemEntries(UnixPath path)
        {
            foreach(var item in fs.EnumeratePaths(ConvertUPathFromUnixPath(path)))
            {
                yield return ConvertUPathToUnixPath(item);
            }
        }

        private class ZioWatcher : IVirtualWatcher
        {
            Zio.IFileSystemWatcher watcher;
            ZioFileSystem _fs;
            public ZioWatcher(ZioFileSystem fs,IFileSystem fs2,UnixPath path)
            {
                watcher = fs2.Watch(fs.ConvertUPathFromUnixPath(path));
                watcher.Changed += (sender,e)=>{
                    Changed?.Invoke(this,new VirtualWatcherChangedArgs(fs,(System.IO.WatcherChangeTypes)(int)e.ChangeType,fs.ConvertUPathToUnixPath(e.FullPath)));
                };
                watcher.Created += (sender,e)=>{
                    Created?.Invoke(this,new VirtualWatcherChangedArgs(fs,(System.IO.WatcherChangeTypes)(int)e.ChangeType,fs.ConvertUPathToUnixPath(e.FullPath)));
                };
                watcher.Deleted += (sender,e)=>{
                    Deleted?.Invoke(this,new VirtualWatcherChangedArgs(fs,(System.IO.WatcherChangeTypes)(int)e.ChangeType,fs.ConvertUPathToUnixPath(e.FullPath)));
                };
                watcher.Error += (sender,e)=>{
                    Error?.Invoke(this,new ErrorEventArgs(e.Exception));
                };
                watcher.Renamed += (sender,e)=>{
                    Renamed?.Invoke(this,new VirtualWatcherRenamedEventArgs(fs,(System.IO.WatcherChangeTypes)(int)e.ChangeType,fs.ConvertUPathToUnixPath(e.FullPath),fs.ConvertUPathToUnixPath(e.OldFullPath)));
                };
                _fs=fs;
            }
            public int InternalBufferSize { get => watcher.InternalBufferSize; set => watcher.InternalBufferSize=value;}
            public System.IO.NotifyFilters NotifyFilter { get => (System.IO.NotifyFilters)watcher.NotifyFilter; set => watcher.NotifyFilter=(Zio.NotifyFilters)value; }
            public bool EnableRaisingEvents { get => watcher.EnableRaisingEvents; set => watcher.EnableRaisingEvents=value; }
            public string Filter { get => watcher.Filter; set => watcher.Filter=value; }
            public bool IncludeSubdirectories { get => watcher.IncludeSubdirectories; set => watcher.IncludeSubdirectories=value;}

            public event EventHandler<VirtualWatcherChangedArgs> Changed;
            public event EventHandler<VirtualWatcherChangedArgs> Created;
            public event EventHandler<VirtualWatcherChangedArgs> Deleted;
            public event EventHandler<VirtualWatcherRenamedEventArgs> Renamed;
            public event EventHandler<ErrorEventArgs> Error;
        }

    }
}