//============================================================================
// BDInfo - Blu-ray Video and Audio Analysis Tool
// Copyright © 2010 Cinema Squid
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library 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
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//=============================================================================

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using MediaBrowser.Model.IO;

namespace BDInfo
{
    public class BDROM
    {
        public FileSystemMetadata DirectoryRoot = null;
        public FileSystemMetadata DirectoryBDMV = null;
        public FileSystemMetadata DirectoryBDJO = null;
        public FileSystemMetadata DirectoryCLIPINF = null;
        public FileSystemMetadata DirectoryPLAYLIST = null;
        public FileSystemMetadata DirectorySNP = null;
        public FileSystemMetadata DirectorySSIF = null;
        public FileSystemMetadata DirectorySTREAM = null;

        public string VolumeLabel = null;
        public ulong Size = 0;
        public bool IsBDPlus = false;
        public bool IsBDJava = false;
        public bool IsDBOX = false;
        public bool IsPSP = false;
        public bool Is3D = false;
        public bool Is50Hz = false;

        private readonly IFileSystem _fileSystem;

        public Dictionary<string, TSPlaylistFile> PlaylistFiles =
            new Dictionary<string, TSPlaylistFile>();
        public Dictionary<string, TSStreamClipFile> StreamClipFiles =
            new Dictionary<string, TSStreamClipFile>();
        public Dictionary<string, TSStreamFile> StreamFiles =
            new Dictionary<string, TSStreamFile>();
        public Dictionary<string, TSInterleavedFile> InterleavedFiles =
            new Dictionary<string, TSInterleavedFile>();

        public delegate bool OnStreamClipFileScanError(
            TSStreamClipFile streamClipFile, Exception ex);

        public event OnStreamClipFileScanError StreamClipFileScanError;

        public delegate bool OnStreamFileScanError(
            TSStreamFile streamClipFile, Exception ex);

        public event OnStreamFileScanError StreamFileScanError;

        public delegate bool OnPlaylistFileScanError(
            TSPlaylistFile playlistFile, Exception ex);

        public event OnPlaylistFileScanError PlaylistFileScanError;

        public BDROM(string path, IFileSystem fileSystem)
        {
            if (string.IsNullOrEmpty(path))
            {
                throw new ArgumentNullException(nameof(path));
            }

            _fileSystem = fileSystem;
            //
            // Locate BDMV directories.
            //

            DirectoryBDMV =
                GetDirectoryBDMV(path);

            if (DirectoryBDMV == null)
            {
                throw new Exception("Unable to locate BD structure.");
            }

            DirectoryRoot =
                _fileSystem.GetDirectoryInfo(Path.GetDirectoryName(DirectoryBDMV.FullName));
            DirectoryBDJO =
                GetDirectory("BDJO", DirectoryBDMV, 0);
            DirectoryCLIPINF =
                GetDirectory("CLIPINF", DirectoryBDMV, 0);
            DirectoryPLAYLIST =
                GetDirectory("PLAYLIST", DirectoryBDMV, 0);
            DirectorySNP =
                GetDirectory("SNP", DirectoryRoot, 0);
            DirectorySTREAM =
                GetDirectory("STREAM", DirectoryBDMV, 0);
            DirectorySSIF =
                GetDirectory("SSIF", DirectorySTREAM, 0);

            if (DirectoryCLIPINF == null
                || DirectoryPLAYLIST == null)
            {
                throw new Exception("Unable to locate BD structure.");
            }

            //
            // Initialize basic disc properties.
            //

            VolumeLabel = GetVolumeLabel(DirectoryRoot);
            Size = (ulong)GetDirectorySize(DirectoryRoot);

            if (null != GetDirectory("BDSVM", DirectoryRoot, 0))
            {
                IsBDPlus = true;
            }
            if (null != GetDirectory("SLYVM", DirectoryRoot, 0))
            {
                IsBDPlus = true;
            }
            if (null != GetDirectory("ANYVM", DirectoryRoot, 0))
            {
                IsBDPlus = true;
            }

            if (DirectoryBDJO != null &&
                _fileSystem.GetFilePaths(DirectoryBDJO.FullName).Any())
            {
                IsBDJava = true;
            }

            if (DirectorySNP != null &&
                GetFilePaths(DirectorySNP.FullName, ".mnv").Any())
            {
                IsPSP = true;
            }

            if (DirectorySSIF != null &&
                _fileSystem.GetFilePaths(DirectorySSIF.FullName).Any())
            {
                Is3D = true;
            }

            if (File.Exists(Path.Combine(DirectoryRoot.FullName, "FilmIndex.xml")))
            {
                IsDBOX = true;
            }

            //
            // Initialize file lists.
            //

            if (DirectoryPLAYLIST != null)
            {
                FileSystemMetadata[] files = GetFiles(DirectoryPLAYLIST.FullName, ".mpls").ToArray();
                foreach (var file in files)
                {
                    PlaylistFiles.Add(
                        file.Name.ToUpper(), new TSPlaylistFile(this, file));
                }
            }

            if (DirectorySTREAM != null)
            {
                FileSystemMetadata[] files = GetFiles(DirectorySTREAM.FullName, ".m2ts").ToArray();
                foreach (var file in files)
                {
                    StreamFiles.Add(
                        file.Name.ToUpper(), new TSStreamFile(file, _fileSystem));
                }
            }

            if (DirectoryCLIPINF != null)
            {
                FileSystemMetadata[] files = GetFiles(DirectoryCLIPINF.FullName, ".clpi").ToArray();
                foreach (var file in files)
                {
                    StreamClipFiles.Add(
                        file.Name.ToUpper(), new TSStreamClipFile(file));
                }
            }

            if (DirectorySSIF != null)
            {
                FileSystemMetadata[] files = GetFiles(DirectorySSIF.FullName, ".ssif").ToArray();
                foreach (var file in files)
                {
                    InterleavedFiles.Add(
                        file.Name.ToUpper(), new TSInterleavedFile(file));
                }
            }
        }

        private IEnumerable<FileSystemMetadata> GetFiles(string path, string extension)
        {
            return _fileSystem.GetFiles(path, new[] { extension }, false, false);
        }

        private IEnumerable<string> GetFilePaths(string path, string extension)
        {
            return _fileSystem.GetFilePaths(path, new[] { extension }, false, false);
        }

        public void Scan()
        {
            var errorStreamClipFiles = new List<TSStreamClipFile>();
            foreach (var streamClipFile in StreamClipFiles.Values)
            {
                try
                {
                    streamClipFile.Scan();
                }
                catch (Exception ex)
                {
                    errorStreamClipFiles.Add(streamClipFile);
                    if (StreamClipFileScanError != null)
                    {
                        if (StreamClipFileScanError(streamClipFile, ex))
                        {
                            continue;
                        }
                        else
                        {
                            break;
                        }
                    }
                    else throw;
                }
            }

            foreach (var streamFile in StreamFiles.Values)
            {
                string ssifName = Path.GetFileNameWithoutExtension(streamFile.Name) + ".SSIF";
                if (InterleavedFiles.ContainsKey(ssifName))
                {
                    streamFile.InterleavedFile = InterleavedFiles[ssifName];
                }
            }

            TSStreamFile[] streamFiles = new TSStreamFile[StreamFiles.Count];
            StreamFiles.Values.CopyTo(streamFiles, 0);
            Array.Sort(streamFiles, CompareStreamFiles);

            var errorPlaylistFiles = new List<TSPlaylistFile>();
            foreach (var playlistFile in PlaylistFiles.Values)
            {
                try
                {
                    playlistFile.Scan(StreamFiles, StreamClipFiles);
                }
                catch (Exception ex)
                {
                    errorPlaylistFiles.Add(playlistFile);
                    if (PlaylistFileScanError != null)
                    {
                        if (PlaylistFileScanError(playlistFile, ex))
                        {
                            continue;
                        }
                        else
                        {
                            break;
                        }
                    }
                    else throw;
                }
            }

            var errorStreamFiles = new List<TSStreamFile>();
            foreach (var streamFile in streamFiles)
            {
                try
                {
                    var playlists = new List<TSPlaylistFile>();
                    foreach (var playlist in PlaylistFiles.Values)
                    {
                        foreach (var streamClip in playlist.StreamClips)
                        {
                            if (streamClip.Name == streamFile.Name)
                            {
                                playlists.Add(playlist);
                                break;
                            }
                        }
                    }
                    streamFile.Scan(playlists, false);
                }
                catch (Exception ex)
                {
                    errorStreamFiles.Add(streamFile);
                    if (StreamFileScanError != null)
                    {
                        if (StreamFileScanError(streamFile, ex))
                        {
                            continue;
                        }
                        else
                        {
                            break;
                        }
                    }
                    else throw;
                }
            }

            foreach (var playlistFile in PlaylistFiles.Values)
            {
                playlistFile.Initialize();
                if (!Is50Hz)
                {
                    foreach (var videoStream in playlistFile.VideoStreams)
                    {
                        if (videoStream.FrameRate == TSFrameRate.FRAMERATE_25 ||
                            videoStream.FrameRate == TSFrameRate.FRAMERATE_50)
                        {
                            Is50Hz = true;
                        }
                    }
                }
            }
        }

        private FileSystemMetadata GetDirectoryBDMV(
            string path)
        {
            if (string.IsNullOrEmpty(path))
            {
                throw new ArgumentNullException(nameof(path));
            }

            FileSystemMetadata dir = _fileSystem.GetDirectoryInfo(path);

            while (dir != null)
            {
                if (string.Equals(dir.Name, "BDMV", StringComparison.OrdinalIgnoreCase))
                {
                    return dir;
                }
                var parentFolder = Path.GetDirectoryName(dir.FullName);
                if (string.IsNullOrEmpty(parentFolder))
                {
                    dir = null;
                }
                else
                {
                    dir = _fileSystem.GetDirectoryInfo(parentFolder);
                }
            }

            return GetDirectory("BDMV", _fileSystem.GetDirectoryInfo(path), 0);
        }

        private FileSystemMetadata GetDirectory(
            string name,
            FileSystemMetadata dir,
            int searchDepth)
        {
            if (dir != null)
            {
                FileSystemMetadata[] children = _fileSystem.GetDirectories(dir.FullName).ToArray();
                foreach (var child in children)
                {
                    if (string.Equals(child.Name, name, StringComparison.OrdinalIgnoreCase))
                    {
                        return child;
                    }
                }
                if (searchDepth > 0)
                {
                    foreach (var child in children)
                    {
                        GetDirectory(
                            name, child, searchDepth - 1);
                    }
                }
            }
            return null;
        }

        private long GetDirectorySize(FileSystemMetadata directoryInfo)
        {
            long size = 0;

            //if (!ExcludeDirs.Contains(directoryInfo.Name.ToUpper()))  // TODO: Keep?
            {
                FileSystemMetadata[] pathFiles = _fileSystem.GetFiles(directoryInfo.FullName).ToArray();
                foreach (var pathFile in pathFiles)
                {
                    if (pathFile.Extension.ToUpper() == ".SSIF")
                    {
                        continue;
                    }
                    size += pathFile.Length;
                }

                FileSystemMetadata[] pathChildren = _fileSystem.GetDirectories(directoryInfo.FullName).ToArray();
                foreach (var pathChild in pathChildren)
                {
                    size += GetDirectorySize(pathChild);
                }
            }

            return size;
        }

        private string GetVolumeLabel(FileSystemMetadata dir)
        {
            return dir.Name;
        }

        public int CompareStreamFiles(
            TSStreamFile x,
            TSStreamFile y)
        {
            // TODO: Use interleaved file sizes

            if ((x == null || x.FileInfo == null) && (y == null || y.FileInfo == null))
            {
                return 0;
            }
            else if ((x == null || x.FileInfo == null) && (y != null && y.FileInfo != null))
            {
                return 1;
            }
            else if ((x != null || x.FileInfo != null) && (y == null || y.FileInfo == null))
            {
                return -1;
            }
            else
            {
                if (x.FileInfo.Length > y.FileInfo.Length)
                {
                    return 1;
                }
                else if (y.FileInfo.Length > x.FileInfo.Length)
                {
                    return -1;
                }
                else
                {
                    return 0;
                }
            }
        }

    }
}
