using DvdLib.Ifo;
using MediaBrowser.Common.Configuration;
using MediaBrowser.Model.Dlna;
using MediaBrowser.Controller.Chapters;
using MediaBrowser.Controller.Configuration;
using MediaBrowser.Controller.Entities;
using MediaBrowser.Controller.Entities.Movies;
using MediaBrowser.Controller.Entities.TV;
using MediaBrowser.Controller.Library;
using MediaBrowser.Controller.MediaEncoding;
using MediaBrowser.Controller.Persistence;
using MediaBrowser.Controller.Providers;
using MediaBrowser.Controller.Subtitles;
using MediaBrowser.Model.Configuration;
using MediaBrowser.Model.Entities;
using MediaBrowser.Model.IO;
using MediaBrowser.Model.Logging;
using MediaBrowser.Model.MediaInfo;
using MediaBrowser.Model.Providers;
using MediaBrowser.Model.Serialization;
using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using MediaBrowser.Model.Globalization;

namespace MediaBrowser.Providers.MediaInfo
{
    public class FFProbeVideoInfo
    {
        private readonly ILogger _logger;
        private readonly IIsoManager _isoManager;
        private readonly IMediaEncoder _mediaEncoder;
        private readonly IItemRepository _itemRepo;
        private readonly IBlurayExaminer _blurayExaminer;
        private readonly ILocalizationManager _localization;
        private readonly IApplicationPaths _appPaths;
        private readonly IJsonSerializer _json;
        private readonly IEncodingManager _encodingManager;
        private readonly IFileSystem _fileSystem;
        private readonly IServerConfigurationManager _config;
        private readonly ISubtitleManager _subtitleManager;
        private readonly IChapterManager _chapterManager;
        private readonly ILibraryManager _libraryManager;

        public FFProbeVideoInfo(ILogger logger, IIsoManager isoManager, IMediaEncoder mediaEncoder, IItemRepository itemRepo, IBlurayExaminer blurayExaminer, ILocalizationManager localization, IApplicationPaths appPaths, IJsonSerializer json, IEncodingManager encodingManager, IFileSystem fileSystem, IServerConfigurationManager config, ISubtitleManager subtitleManager, IChapterManager chapterManager, ILibraryManager libraryManager)
        {
            _logger = logger;
            _isoManager = isoManager;
            _mediaEncoder = mediaEncoder;
            _itemRepo = itemRepo;
            _blurayExaminer = blurayExaminer;
            _localization = localization;
            _appPaths = appPaths;
            _json = json;
            _encodingManager = encodingManager;
            _fileSystem = fileSystem;
            _config = config;
            _subtitleManager = subtitleManager;
            _chapterManager = chapterManager;
            _libraryManager = libraryManager;
        }

        public async Task<ItemUpdateType> ProbeVideo<T>(T item,
            MetadataRefreshOptions options,
            CancellationToken cancellationToken)
            where T : Video
        {
            var isoMount = await MountIsoIfNeeded(item, cancellationToken).ConfigureAwait(false);

            BlurayDiscInfo blurayDiscInfo = null;

            try
            {
                Model.MediaInfo.MediaInfo mediaInfoResult = null;

                if (!item.IsShortcut)
                {
                    string[] streamFileNames = null;

                    if (item.VideoType == VideoType.Iso)
                    {
                        item.IsoType = DetermineIsoType(isoMount);
                    }

                    if (item.VideoType == VideoType.Dvd || (item.IsoType.HasValue && item.IsoType == IsoType.Dvd))
                    {
                        streamFileNames = FetchFromDvdLib(item, isoMount);

                        if (streamFileNames.Length == 0)
                        {
                            _logger.Error("No playable vobs found in dvd structure, skipping ffprobe.");
                            return ItemUpdateType.MetadataImport;
                        }
                    }

                    else if (item.VideoType == VideoType.BluRay || (item.IsoType.HasValue && item.IsoType == IsoType.BluRay))
                    {
                        var inputPath = isoMount != null ? isoMount.MountedPath : item.Path;

                        blurayDiscInfo = GetBDInfo(inputPath);

                        streamFileNames = blurayDiscInfo.Files;

                        if (streamFileNames.Length == 0)
                        {
                            _logger.Error("No playable vobs found in bluray structure, skipping ffprobe.");
                            return ItemUpdateType.MetadataImport;
                        }
                    }

                    if (streamFileNames == null)
                    {
                        streamFileNames = new string[] { };
                    }

                    mediaInfoResult = await GetMediaInfo(item, isoMount, streamFileNames, cancellationToken).ConfigureAwait(false);

                    cancellationToken.ThrowIfCancellationRequested();
                }

                await Fetch(item, cancellationToken, mediaInfoResult, isoMount, blurayDiscInfo, options).ConfigureAwait(false);

            }
            finally
            {
                if (isoMount != null)
                {
                    isoMount.Dispose();
                }
            }

            return ItemUpdateType.MetadataImport;
        }

        private Task<Model.MediaInfo.MediaInfo> GetMediaInfo(Video item,
            IIsoMount isoMount,
            string[] streamFileNames,
            CancellationToken cancellationToken)
        {
            cancellationToken.ThrowIfCancellationRequested();

            var protocol = item.LocationType == LocationType.Remote
                ? MediaProtocol.Http
                : MediaProtocol.File;

            return _mediaEncoder.GetMediaInfo(new MediaInfoRequest
            {
                PlayableStreamFileNames = streamFileNames,
                MountedIso = isoMount,
                ExtractChapters = true,
                VideoType = item.VideoType,
                MediaType = DlnaProfileType.Video,
                InputPath = item.Path,
                Protocol = protocol

            }, cancellationToken);
        }

        protected async Task Fetch(Video video,
            CancellationToken cancellationToken,
            Model.MediaInfo.MediaInfo mediaInfo,
            IIsoMount isoMount,
            BlurayDiscInfo blurayInfo,
            MetadataRefreshOptions options)
        {
            List<MediaStream> mediaStreams;
            List<ChapterInfo> chapters;

            if (mediaInfo != null)
            {
                mediaStreams = mediaInfo.MediaStreams;

                video.TotalBitrate = mediaInfo.Bitrate;
                //video.FormatName = (mediaInfo.Container ?? string.Empty)
                //    .Replace("matroska", "mkv", StringComparison.OrdinalIgnoreCase);

                // For dvd's this may not always be accurate, so don't set the runtime if the item already has one
                var needToSetRuntime = video.VideoType != VideoType.Dvd || video.RunTimeTicks == null || video.RunTimeTicks.Value == 0;

                if (needToSetRuntime)
                {
                    video.RunTimeTicks = mediaInfo.RunTimeTicks;
                }

                if (video.VideoType == VideoType.VideoFile)
                {
                    var extension = (Path.GetExtension(video.Path) ?? string.Empty).TrimStart('.');

                    video.Container = extension;
                }
                else
                {
                    video.Container = null;
                }
                video.Container = mediaInfo.Container;

                chapters = mediaInfo.Chapters == null ? new List<ChapterInfo>() : mediaInfo.Chapters.ToList();
                if (blurayInfo != null)
                {
                    FetchBdInfo(video, chapters, mediaStreams, blurayInfo);
                }
            }
            else
            {
                mediaStreams = new List<MediaStream>();
                chapters = new List<ChapterInfo>();
            }

            await AddExternalSubtitles(video, mediaStreams, options, cancellationToken).ConfigureAwait(false);

            var libraryOptions = _libraryManager.GetLibraryOptions(video);

            if (mediaInfo != null)
            {
                FetchEmbeddedInfo(video, mediaInfo, options, libraryOptions);
                FetchPeople(video, mediaInfo, options);
                video.Timestamp = mediaInfo.Timestamp;
                video.Video3DFormat = video.Video3DFormat ?? mediaInfo.Video3DFormat;
            }

            video.IsHD = mediaStreams.Any(i => i.Type == MediaStreamType.Video && i.Width.HasValue && i.Width.Value >= 1260);

            var videoStream = mediaStreams.FirstOrDefault(i => i.Type == MediaStreamType.Video);

            video.DefaultVideoStreamIndex = videoStream == null ? (int?)null : videoStream.Index;

            video.HasSubtitles = mediaStreams.Any(i => i.Type == MediaStreamType.Subtitle);

            _itemRepo.SaveMediaStreams(video.Id, mediaStreams, cancellationToken);

            if (options.MetadataRefreshMode == MetadataRefreshMode.FullRefresh ||
                options.MetadataRefreshMode == MetadataRefreshMode.Default)
            {
                if (chapters.Count == 0 && mediaStreams.Any(i => i.Type == MediaStreamType.Video))
                {
                    AddDummyChapters(video, chapters);
                }

                NormalizeChapterNames(chapters);

                var extractDuringScan = false;
                if (libraryOptions != null)
                {
                    extractDuringScan = libraryOptions.ExtractChapterImagesDuringLibraryScan;
                }

                await _encodingManager.RefreshChapterImages(video, options.DirectoryService, chapters, extractDuringScan, false, cancellationToken).ConfigureAwait(false);

                _chapterManager.SaveChapters(video.Id.ToString(), chapters);
            }
        }

        private void NormalizeChapterNames(List<ChapterInfo> chapters)
        {
            var index = 1;

            foreach (var chapter in chapters)
            {
                TimeSpan time;

                // Check if the name is empty and/or if the name is a time
                // Some ripping programs do that.
                if (string.IsNullOrWhiteSpace(chapter.Name) ||
                    TimeSpan.TryParse(chapter.Name, out time))
                {
                    chapter.Name = string.Format(_localization.GetLocalizedString("ChapterNameValue"), index.ToString(CultureInfo.InvariantCulture));
                }
                index++;
            }
        }

        private void FetchBdInfo(BaseItem item, List<ChapterInfo> chapters, List<MediaStream> mediaStreams, BlurayDiscInfo blurayInfo)
        {
            var video = (Video)item;

            //video.PlayableStreamFileNames = blurayInfo.Files.ToList();

            // Use BD Info if it has multiple m2ts. Otherwise, treat it like a video file and rely more on ffprobe output
            if (blurayInfo.Files.Length > 1)
            {
                int? currentHeight = null;
                int? currentWidth = null;
                int? currentBitRate = null;

                var videoStream = mediaStreams.FirstOrDefault(s => s.Type == MediaStreamType.Video);

                // Grab the values that ffprobe recorded
                if (videoStream != null)
                {
                    currentBitRate = videoStream.BitRate;
                    currentWidth = videoStream.Width;
                    currentHeight = videoStream.Height;
                }

                // Fill video properties from the BDInfo result
                mediaStreams.Clear();
                mediaStreams.AddRange(blurayInfo.MediaStreams);

                if (blurayInfo.RunTimeTicks.HasValue && blurayInfo.RunTimeTicks.Value > 0)
                {
                    video.RunTimeTicks = blurayInfo.RunTimeTicks;
                }

                if (blurayInfo.Chapters != null)
                {
                    chapters.Clear();

                    chapters.AddRange(blurayInfo.Chapters.Select(c => new ChapterInfo
                    {
                        StartPositionTicks = TimeSpan.FromSeconds(c).Ticks

                    }));
                }

                videoStream = mediaStreams.FirstOrDefault(s => s.Type == MediaStreamType.Video);

                // Use the ffprobe values if these are empty
                if (videoStream != null)
                {
                    videoStream.BitRate = IsEmpty(videoStream.BitRate) ? currentBitRate : videoStream.BitRate;
                    videoStream.Width = IsEmpty(videoStream.Width) ? currentWidth : videoStream.Width;
                    videoStream.Height = IsEmpty(videoStream.Height) ? currentHeight : videoStream.Height;
                }
            }
        }

        private bool IsEmpty(int? num)
        {
            return !num.HasValue || num.Value == 0;
        }

        /// <summary>
        /// Gets information about the longest playlist on a bdrom
        /// </summary>
        /// <param name="path">The path.</param>
        /// <returns>VideoStream.</returns>
        private BlurayDiscInfo GetBDInfo(string path)
        {
            if (string.IsNullOrWhiteSpace(path))
            {
                throw new ArgumentNullException("path");
            }

            try
            {
                return _blurayExaminer.GetDiscInfo(path);
            }
            catch (Exception ex)
            {
                _logger.ErrorException("Error getting BDInfo", ex);
                return null;
            }
        }

        private void FetchEmbeddedInfo(Video video, Model.MediaInfo.MediaInfo data, MetadataRefreshOptions refreshOptions, LibraryOptions libraryOptions)
        {
            var isFullRefresh = refreshOptions.MetadataRefreshMode == MetadataRefreshMode.FullRefresh;

            if (!video.IsLocked && !video.LockedFields.Contains(MetadataFields.OfficialRating))
            {
                if (!string.IsNullOrWhiteSpace(data.OfficialRating) || isFullRefresh)
                {
                    video.OfficialRating = data.OfficialRating;
                }
            }

            if (!video.IsLocked && !video.LockedFields.Contains(MetadataFields.Genres))
            {
                if (video.Genres.Count == 0 || isFullRefresh)
                {
                    video.Genres.Clear();

                    foreach (var genre in data.Genres)
                    {
                        video.AddGenre(genre);
                    }
                }
            }

            if (!video.IsLocked && !video.LockedFields.Contains(MetadataFields.Studios))
            {
                if (video.Studios.Length == 0 || isFullRefresh)
                {
                    video.SetStudios(data.Studios);
                }
            }

            if (data.ProductionYear.HasValue)
            {
                if (!video.ProductionYear.HasValue || isFullRefresh)
                {
                    video.ProductionYear = data.ProductionYear;
                }
            }
            if (data.PremiereDate.HasValue)
            {
                if (!video.PremiereDate.HasValue || isFullRefresh)
                {
                    video.PremiereDate = data.PremiereDate;
                }
            }
            if (data.IndexNumber.HasValue)
            {
                if (!video.IndexNumber.HasValue || isFullRefresh)
                {
                    video.IndexNumber = data.IndexNumber;
                }
            }
            if (data.ParentIndexNumber.HasValue)
            {
                if (!video.ParentIndexNumber.HasValue || isFullRefresh)
                {
                    video.ParentIndexNumber = data.ParentIndexNumber;
                }
            }

            if (!video.IsLocked && !video.LockedFields.Contains(MetadataFields.Name))
            {
                if (!string.IsNullOrWhiteSpace(data.Name) && libraryOptions.EnableEmbeddedTitles)
                {
                    // Don't use the embedded name for extras because it will often be the same name as the movie
                    if (!video.ExtraType.HasValue && !video.IsOwnedItem)
                    {
                        video.Name = data.Name;
                    }
                }
            }

            // If we don't have a ProductionYear try and get it from PremiereDate
            if (video.PremiereDate.HasValue && !video.ProductionYear.HasValue)
            {
                video.ProductionYear = video.PremiereDate.Value.ToLocalTime().Year;
            }

            if (!video.IsLocked && !video.LockedFields.Contains(MetadataFields.Overview))
            {
                if (string.IsNullOrWhiteSpace(video.Overview) || isFullRefresh)
                {
                    video.Overview = data.Overview;
                }
            }
        }

        private void FetchPeople(Video video, Model.MediaInfo.MediaInfo data, MetadataRefreshOptions options)
        {
            var isFullRefresh = options.MetadataRefreshMode == MetadataRefreshMode.FullRefresh;

            if (!video.IsLocked && !video.LockedFields.Contains(MetadataFields.Cast))
            {
                if (isFullRefresh || _libraryManager.GetPeople(video).Count == 0)
                {
                    var people = new List<PersonInfo>();

                    foreach (var person in data.People)
                    {
                        PeopleHelper.AddPerson(people, new PersonInfo
                        {
                            Name = person.Name,
                            Type = person.Type,
                            Role = person.Role
                        });
                    }

                    _libraryManager.UpdatePeople(video, people);
                }
            }
        }

        private SubtitleOptions GetOptions()
        {
            return _config.GetConfiguration<SubtitleOptions>("subtitles");
        }

        /// <summary>
        /// Adds the external subtitles.
        /// </summary>
        /// <param name="video">The video.</param>
        /// <param name="currentStreams">The current streams.</param>
        /// <param name="options">The refreshOptions.</param>
        /// <param name="cancellationToken">The cancellation token.</param>
        /// <returns>Task.</returns>
        private async Task AddExternalSubtitles(Video video,
            List<MediaStream> currentStreams,
            MetadataRefreshOptions options,
            CancellationToken cancellationToken)
        {
            var subtitleResolver = new SubtitleResolver(_localization, _fileSystem);

            var startIndex = currentStreams.Count == 0 ? 0 : (currentStreams.Select(i => i.Index).Max() + 1);
            var externalSubtitleStreams = subtitleResolver.GetExternalSubtitleStreams(video, startIndex, options.DirectoryService, false);

            var enableSubtitleDownloading = options.MetadataRefreshMode == MetadataRefreshMode.Default ||
                                            options.MetadataRefreshMode == MetadataRefreshMode.FullRefresh;

            var subtitleOptions = GetOptions();

            if (enableSubtitleDownloading && (subtitleOptions.DownloadEpisodeSubtitles &&
                video is Episode) ||
                (subtitleOptions.DownloadMovieSubtitles &&
                video is Movie))
            {
                var downloadedLanguages = await new SubtitleDownloader(_logger,
                    _subtitleManager)
                    .DownloadSubtitles(video,
                    currentStreams.Concat(externalSubtitleStreams).ToList(),
                    subtitleOptions.SkipIfEmbeddedSubtitlesPresent,
                    subtitleOptions.SkipIfAudioTrackMatches,
                    subtitleOptions.RequirePerfectMatch,
                    subtitleOptions.DownloadLanguages,
                    cancellationToken).ConfigureAwait(false);

                // Rescan
                if (downloadedLanguages.Count > 0)
                {
                    externalSubtitleStreams = subtitleResolver.GetExternalSubtitleStreams(video, startIndex, options.DirectoryService, true);
                }
            }

            video.SubtitleFiles = externalSubtitleStreams.Select(i => i.Path).OrderBy(i => i).ToArray();

            currentStreams.AddRange(externalSubtitleStreams);
        }

        /// <summary>
        /// The dummy chapter duration
        /// </summary>
        private readonly long _dummyChapterDuration = TimeSpan.FromMinutes(5).Ticks;

        /// <summary>
        /// Adds the dummy chapters.
        /// </summary>
        /// <param name="video">The video.</param>
        /// <param name="chapters">The chapters.</param>
        private void AddDummyChapters(Video video, List<ChapterInfo> chapters)
        {
            var runtime = video.RunTimeTicks ?? 0;

            if (runtime < 0)
            {
                throw new ArgumentException(string.Format("{0} has invalid runtime of {1}", video.Name, runtime));
            }

            if (runtime < _dummyChapterDuration)
            {
                return;
            }

            long currentChapterTicks = 0;
            var index = 1;

            // Limit to 100 chapters just in case there's some incorrect metadata here
            while (currentChapterTicks < runtime && index < 100)
            {
                chapters.Add(new ChapterInfo
                {
                    StartPositionTicks = currentChapterTicks
                });

                index++;
                currentChapterTicks += _dummyChapterDuration;
            }
        }

        private string[] FetchFromDvdLib(Video item, IIsoMount mount)
        {
            var path = mount == null ? item.Path : mount.MountedPath;
            var dvd = new Dvd(path, _fileSystem);

            var primaryTitle = dvd.Titles.OrderByDescending(GetRuntime).FirstOrDefault();

            byte? titleNumber = null;

            if (primaryTitle != null)
            {
                titleNumber = primaryTitle.VideoTitleSetNumber;
                item.RunTimeTicks = GetRuntime(primaryTitle);
            }

            return _mediaEncoder.GetPrimaryPlaylistVobFiles(item.Path, mount, titleNumber)
                .Select(Path.GetFileName)
                .ToArray();
        }

        private long GetRuntime(Title title)
        {
            return title.ProgramChains
                    .Select(i => (TimeSpan)i.PlaybackTime)
                    .Select(i => i.Ticks)
                    .Sum();
        }

        /// <summary>
        /// Mounts the iso if needed.
        /// </summary>
        /// <param name="item">The item.</param>
        /// <param name="cancellationToken">The cancellation token.</param>
        /// <returns>IsoMount.</returns>
        protected Task<IIsoMount> MountIsoIfNeeded(Video item, CancellationToken cancellationToken)
        {
            if (item.VideoType == VideoType.Iso)
            {
                return _isoManager.Mount(item.Path, cancellationToken);
            }

            return Task.FromResult<IIsoMount>(null);
        }

        /// <summary>
        /// Determines the type of the iso.
        /// </summary>
        /// <param name="isoMount">The iso mount.</param>
        /// <returns>System.Nullable{IsoType}.</returns>
        private IsoType? DetermineIsoType(IIsoMount isoMount)
        {
            var fileSystemEntries = _fileSystem.GetFileSystemEntryPaths(isoMount.MountedPath).Select(Path.GetFileName).ToList();

            if (fileSystemEntries.Contains("video_ts", StringComparer.OrdinalIgnoreCase) ||
                fileSystemEntries.Contains("VIDEO_TS.IFO", StringComparer.OrdinalIgnoreCase))
            {
                return IsoType.Dvd;
            }
            if (fileSystemEntries.Contains("bdmv", StringComparer.OrdinalIgnoreCase))
            {
                return IsoType.BluRay;
            }

            return null;
        }
    }
}