#nullable disable

#pragma warning disable CS1591

using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text.Json.Serialization;
using System.Threading;
using System.Threading.Tasks;
using Jellyfin.Data.Enums;
using Jellyfin.Database.Implementations.Entities;
using Jellyfin.Extensions;
using MediaBrowser.Controller.Library;
using MediaBrowser.Controller.LiveTv;
using MediaBrowser.Controller.Persistence;
using MediaBrowser.Controller.Providers;
using MediaBrowser.Model.Dto;
using MediaBrowser.Model.Entities;
using MediaBrowser.Model.IO;
using MediaBrowser.Model.MediaInfo;
using Microsoft.Extensions.Logging;

namespace MediaBrowser.Controller.Entities
{
    /// <summary>
    /// Class Video.
    /// </summary>
    public class Video : BaseItem,
        IHasAspectRatio,
        ISupportsPlaceHolders,
        IHasMediaSources
    {
        public Video()
        {
            AdditionalParts = [];
            LocalAlternateVersions = [];
            SubtitleFiles = [];
            AudioFiles = [];
            LinkedAlternateVersions = [];
        }

        [JsonIgnore]
        public Guid? PrimaryVersionId { get; set; }

        public string[] AdditionalParts { get; set; }

        public string[] LocalAlternateVersions { get; set; }

        public LinkedChild[] LinkedAlternateVersions { get; set; }

        [JsonIgnore]
        public override bool SupportsPlayedStatus => true;

        [JsonIgnore]
        public override bool SupportsPeople => true;

        [JsonIgnore]
        public override bool SupportsInheritedParentImages => true;

        [JsonIgnore]
        public override bool SupportsPositionTicksResume
        {
            get
            {
                var extraType = ExtraType;
                if (extraType.HasValue)
                {
                    if (extraType.Value == Model.Entities.ExtraType.Sample)
                    {
                        return false;
                    }

                    if (extraType.Value == Model.Entities.ExtraType.ThemeVideo)
                    {
                        return false;
                    }

                    if (extraType.Value == Model.Entities.ExtraType.Trailer)
                    {
                        return false;
                    }
                }

                return true;
            }
        }

        [JsonIgnore]
        public override bool SupportsThemeMedia => true;

        /// <summary>
        /// Gets or sets the timestamp.
        /// </summary>
        /// <value>The timestamp.</value>
        public TransportStreamTimestamp? Timestamp { get; set; }

        /// <summary>
        /// Gets or sets the subtitle paths.
        /// </summary>
        /// <value>The subtitle paths.</value>
        public string[] SubtitleFiles { get; set; }

        /// <summary>
        /// Gets or sets the audio paths.
        /// </summary>
        /// <value>The audio paths.</value>
        public string[] AudioFiles { get; set; }

        /// <summary>
        /// Gets or sets a value indicating whether this instance has subtitles.
        /// </summary>
        /// <value><c>true</c> if this instance has subtitles; otherwise, <c>false</c>.</value>
        public bool HasSubtitles { get; set; }

        public bool IsPlaceHolder { get; set; }

        /// <summary>
        /// Gets or sets the default index of the video stream.
        /// </summary>
        /// <value>The default index of the video stream.</value>
        public int? DefaultVideoStreamIndex { get; set; }

        /// <summary>
        /// Gets or sets the type of the video.
        /// </summary>
        /// <value>The type of the video.</value>
        public VideoType VideoType { get; set; }

        /// <summary>
        /// Gets or sets the type of the iso.
        /// </summary>
        /// <value>The type of the iso.</value>
        public IsoType? IsoType { get; set; }

        /// <summary>
        /// Gets or sets the video3 D format.
        /// </summary>
        /// <value>The video3 D format.</value>
        public Video3DFormat? Video3DFormat { get; set; }

        /// <summary>
        /// Gets or sets the aspect ratio.
        /// </summary>
        /// <value>The aspect ratio.</value>
        public string AspectRatio { get; set; }

        [JsonIgnore]
        public override bool SupportsAddingToPlaylist => true;

        [JsonIgnore]
        public int MediaSourceCount
        {
            get
            {
                return GetMediaSourceCount();
            }
        }

        [JsonIgnore]
        public bool IsStacked => AdditionalParts.Length > 0;

        [JsonIgnore]
        public override bool HasLocalAlternateVersions => LibraryManager.GetLocalAlternateVersionIds(this).Any();

        public static IRecordingsManager RecordingsManager { get; set; }

        [JsonIgnore]
        public override SourceType SourceType
        {
            get
            {
                if (IsActiveRecording())
                {
                    return SourceType.LiveTV;
                }

                return base.SourceType;
            }
        }

        [JsonIgnore]
        public bool IsCompleteMedia
        {
            get
            {
                if (SourceType == SourceType.Channel)
                {
                    return !Tags.Contains("livestream", StringComparison.OrdinalIgnoreCase);
                }

                return !IsActiveRecording();
            }
        }

        [JsonIgnore]
        protected virtual bool EnableDefaultVideoUserDataKeys => true;

        [JsonIgnore]
        public override string ContainingFolderPath
        {
            get
            {
                if (IsStacked)
                {
                    return System.IO.Path.GetDirectoryName(Path);
                }

                if (!IsPlaceHolder)
                {
                    if (VideoType == VideoType.BluRay || VideoType == VideoType.Dvd)
                    {
                        return Path;
                    }
                }

                return base.ContainingFolderPath;
            }
        }

        [JsonIgnore]
        public override string FileNameWithoutExtension
        {
            get
            {
                if (IsFileProtocol)
                {
                    if (VideoType == VideoType.BluRay || VideoType == VideoType.Dvd)
                    {
                        return System.IO.Path.GetFileName(Path);
                    }

                    return System.IO.Path.GetFileNameWithoutExtension(Path);
                }

                return null;
            }
        }

        /// <summary>
        /// Gets a value indicating whether [is3 D].
        /// </summary>
        /// <value><c>true</c> if [is3 D]; otherwise, <c>false</c>.</value>
        [JsonIgnore]
        public bool Is3D => Video3DFormat.HasValue;

        /// <summary>
        /// Gets the type of the media.
        /// </summary>
        /// <value>The type of the media.</value>
        [JsonIgnore]
        public override MediaType MediaType => MediaType.Video;

        private int GetMediaSourceCount(HashSet<Guid> callstack = null)
        {
            callstack ??= [];
            if (PrimaryVersionId.HasValue)
            {
                var item = LibraryManager.GetItemById(PrimaryVersionId.Value);
                if (item is Video video)
                {
                    if (callstack.Contains(video.Id))
                    {
                        // Count alternate versions using LibraryManager
                        var linkedCount = LibraryManager.GetLinkedAlternateVersions(video).Count();
                        var localCount = LibraryManager.GetLocalAlternateVersionIds(video).Count();
                        return linkedCount + localCount + 1;
                    }

                    callstack.Add(video.Id);
                    return video.GetMediaSourceCount(callstack);
                }
            }

            // Count alternate versions using LibraryManager
            var linkedVersionCount = LibraryManager.GetLinkedAlternateVersions(this).Count();
            var localVersionCount = LibraryManager.GetLocalAlternateVersionIds(this).Count();
            return linkedVersionCount + localVersionCount + 1;
        }

        /// <inheritdoc />
        public override string GetInheritedOriginalLanguage()
        {
            if (ExtraType.GetValueOrDefault() == Model.Entities.ExtraType.Trailer)
            {
                return GetOwner()?.GetInheritedOriginalLanguage();
            }

            return OriginalLanguage ?? GetOwner()?.GetInheritedOriginalLanguage();
        }

        public override List<string> GetUserDataKeys()
        {
            var list = base.GetUserDataKeys();

            if (EnableDefaultVideoUserDataKeys)
            {
                if (ExtraType.HasValue)
                {
                    var key = this.GetProviderId(MetadataProvider.Tmdb);
                    if (!string.IsNullOrEmpty(key))
                    {
                        list.Insert(0, GetUserDataKey(key));
                    }

                    key = this.GetProviderId(MetadataProvider.Imdb);
                    if (!string.IsNullOrEmpty(key))
                    {
                        list.Insert(0, GetUserDataKey(key));
                    }
                }
                else
                {
                    var key = this.GetProviderId(MetadataProvider.Imdb);
                    if (!string.IsNullOrEmpty(key))
                    {
                        list.Insert(0, key);
                    }

                    key = this.GetProviderId(MetadataProvider.Tmdb);
                    if (!string.IsNullOrEmpty(key))
                    {
                        list.Insert(0, key);
                    }
                }
            }

            return list;
        }

        public void SetPrimaryVersionId(Guid? id)
        {
            PrimaryVersionId = id;
            PresentationUniqueKey = CreatePresentationUniqueKey();
        }

        /// <summary>
        /// Marks the played status of this video and propagates it to its alternate versions.
        /// </summary>
        /// <param name="user">The user.</param>
        /// <param name="datePlayed">The date played.</param>
        /// <param name="resetPosition">if set to <c>true</c> [reset position].</param>
        public override void MarkPlayed(User user, DateTime? datePlayed, bool resetPosition)
        {
            base.MarkPlayed(user, datePlayed, resetPosition);
            PropagatePlayedState(user, true, resetPosition);
        }

        /// <summary>
        /// Marks this video unplayed and propagates the change to its alternate versions.
        /// </summary>
        /// <param name="user">The user.</param>
        public override void MarkUnplayed(User user)
        {
            base.MarkUnplayed(user);

            // MarkUnplayed always clears the position on this video, so reset the versions too.
            PropagatePlayedState(user, false, true);
        }

        /// <summary>
        /// Propagates the played status to every alternate version of this video.
        /// </summary>
        /// <param name="user">The user.</param>
        /// <param name="played">The played status to apply to the alternate versions.</param>
        /// <param name="resetPosition">When marking played, controls whether each version's resume point
        /// is also reset (<c>true</c>) or left untouched (<c>false</c>). Ignored when marking unplayed,
        /// which always fully resets every version.</param>
        public void PropagatePlayedState(User user, bool played, bool resetPosition = true)
        {
            ArgumentNullException.ThrowIfNull(user);

            if (!PrimaryVersionId.HasValue && LinkedAlternateVersions.Length == 0 && !HasLocalAlternateVersions)
            {
                return;
            }

            foreach (var (item, _) in GetAllItemsForMediaSources())
            {
                if (item.Id.Equals(Id) || item is not Video)
                {
                    continue;
                }

                if (played)
                {
                    var dto = new UpdateUserItemDataDto { Played = true };
                    if (resetPosition)
                    {
                        dto.PlaybackPositionTicks = 0;
                    }

                    // SaveUserData only writes the fields set on the DTO, so play count and other state are preserved.
                    UserDataManager.SaveUserData(user, item, dto, UserDataSaveReason.TogglePlayed);
                }
                else
                {
                    var data = UserDataManager.GetUserData(user, item);
                    if (data is null)
                    {
                        continue;
                    }

                    ResetPlayedState(data);
                    UserDataManager.SaveUserData(user, item, data, UserDataSaveReason.TogglePlayed, CancellationToken.None);
                }
            }
        }

        /// <summary>
        /// Gets this video together with all of its alternate versions (local and linked and, when this
        /// is itself an alternate, the primary and the primary's other versions), deduplicated.
        /// </summary>
        /// <returns>This video and every alternate version of it.</returns>
        public IReadOnlyList<Video> GetAllVersions()
        {
            return GetAllItemsForMediaSources()
                .Select(i => i.Item)
                .OfType<Video>()
                .ToList();
        }

        /// <summary>
        /// Gets the alternate version of this video that matches the supplied item id.
        /// </summary>
        /// <param name="itemId">The version item id (the playback media source id).</param>
        /// <returns>The matching version, or <c>null</c> when the id is not a version of this video.</returns>
        public Video GetAlternateVersion(Guid itemId)
        {
            return GetAllVersions().FirstOrDefault(i => i.Id.Equals(itemId));
        }

        public override string CreatePresentationUniqueKey()
        {
            if (PrimaryVersionId.HasValue)
            {
                return PrimaryVersionId.Value.ToString("N", CultureInfo.InvariantCulture);
            }

            return base.CreatePresentationUniqueKey();
        }

        public override bool CanDownload()
        {
            if (VideoType == VideoType.Dvd || VideoType == VideoType.BluRay)
            {
                return false;
            }

            return IsFileProtocol;
        }

        protected override bool IsActiveRecording()
        {
            return RecordingsManager.GetActiveRecordingInfo(Path) is not null;
        }

        public override bool CanDelete()
        {
            if (IsActiveRecording())
            {
                return false;
            }

            return base.CanDelete();
        }

        public IEnumerable<Guid> GetAdditionalPartIds()
        {
            return AdditionalParts.Select(i => LibraryManager.GetNewItemId(i, typeof(Video)));
        }

        private string GetUserDataKey(string providerId)
        {
            var key = providerId + "-" + ExtraType.ToString().ToLowerInvariant();

            // Make sure different trailers have their own data.
            if (RunTimeTicks.HasValue)
            {
                key += "-" + RunTimeTicks.Value.ToString(CultureInfo.InvariantCulture);
            }

            return key;
        }

        /// <summary>
        /// Gets the additional parts.
        /// </summary>
        /// <returns>IEnumerable{Video}.</returns>
        public IOrderedEnumerable<Video> GetAdditionalParts()
        {
            return GetAdditionalPartIds()
                .Select(i => LibraryManager.GetItemById(i))
                .Where(i => i is not null)
                .OfType<Video>()
                .OrderBy(i => i.SortName);
        }

        internal override ItemUpdateType UpdateFromResolvedItem(BaseItem newItem)
        {
            var updateType = base.UpdateFromResolvedItem(newItem);

            if (newItem is Video newVideo)
            {
                if (!AdditionalParts.SequenceEqual(newVideo.AdditionalParts, StringComparer.Ordinal))
                {
                    AdditionalParts = newVideo.AdditionalParts;
                    updateType |= ItemUpdateType.MetadataImport;
                }

                if (!LocalAlternateVersions.SequenceEqual(newVideo.LocalAlternateVersions, StringComparer.Ordinal))
                {
                    LocalAlternateVersions = newVideo.LocalAlternateVersions;
                    updateType |= ItemUpdateType.MetadataImport;
                }

                if (VideoType != newVideo.VideoType)
                {
                    VideoType = newVideo.VideoType;
                    updateType |= ItemUpdateType.MetadataImport;
                }
            }

            return updateType;
        }

        protected override async Task<bool> RefreshedOwnedItems(MetadataRefreshOptions options, IReadOnlyList<FileSystemMetadata> fileSystemChildren, CancellationToken cancellationToken)
        {
            var hasChanges = await base.RefreshedOwnedItems(options, fileSystemChildren, cancellationToken).ConfigureAwait(false);

            // Clean up LocalAlternateVersions - remove paths that no longer exist
            if (LocalAlternateVersions.Length > 0)
            {
                var validPaths = LocalAlternateVersions.Where(FileSystem.FileExists).ToArray();
                if (validPaths.Length != LocalAlternateVersions.Length)
                {
                    LocalAlternateVersions = validPaths;
                    hasChanges = true;
                }
            }

            if (IsStacked)
            {
                var tasks = AdditionalParts
                    .Select(i => RefreshMetadataForOwnedVideo(options, true, i, typeof(Video), cancellationToken));

                await Task.WhenAll(tasks).ConfigureAwait(false);
            }

            // Must have a parent to have additional parts or alternate versions
            // In other words, it must be part of the Parent/Child tree
            // The additional parts won't have additional parts themselves
            if (IsFileProtocol && SupportsOwnedItems)
            {
                // Check if LinkedChildren are in sync before processing
                var existingVersionCount = LibraryManager.GetLocalAlternateVersionIds(this).Count();
                var tasks = LocalAlternateVersions
                    .Select(i => RefreshMetadataForVersions(options, false, i, cancellationToken));

                await Task.WhenAll(tasks).ConfigureAwait(false);

                if (existingVersionCount != LocalAlternateVersions.Length)
                {
                    hasChanges = true;
                }
            }

            return hasChanges;
        }

        private async Task RefreshMetadataForVersions(
            MetadataRefreshOptions options,
            bool copyTitleMetadata,
            string path,
            CancellationToken cancellationToken)
        {
            // Ensure the alternate version exists with the correct type (e.g. Movie, not Video)
            // before refreshing. This must happen here rather than in RefreshMetadataForOwnedVideo
            // because that method is also used for stacked parts which should keep their resolved type.
            var id = LibraryManager.GetNewItemId(path, GetType());
            if (LibraryManager.GetItemById(id) is not Video && FileSystem.FileExists(path))
            {
                var parentFolder = GetParent() as Folder;
                var collectionType = LibraryManager.GetContentType(this);
                var altVideo = LibraryManager.ResolveAlternateVersion(path, GetType(), parentFolder, collectionType);
                if (altVideo is not null)
                {
                    altVideo.OwnerId = Id;
                    altVideo.SetPrimaryVersionId(Id);
                    LibraryManager.CreateItem(altVideo, GetParent());
                }
            }

            await RefreshMetadataForOwnedVideo(options, copyTitleMetadata, path, cancellationToken).ConfigureAwait(false);

            // Create LinkedChild entry for this local alternate version
            // This ensures the relationship exists in the database even if the alternate version
            // was created after the primary video was first saved
            if (LibraryManager.GetItemById(id) is Video video)
            {
                LibraryManager.UpsertLinkedChild(Id, video.Id, LinkedChildType.LocalAlternateVersion);

                // Ensure PrimaryVersionId is set for existing alternate versions that may not have it
                if (!video.PrimaryVersionId.HasValue)
                {
                    video.SetPrimaryVersionId(Id);
                    await video.UpdateToRepositoryAsync(ItemUpdateType.MetadataEdit, cancellationToken).ConfigureAwait(false);
                }
            }
        }

        private new Task RefreshMetadataForOwnedVideo(
            MetadataRefreshOptions options,
            bool copyTitleMetadata,
            string path,
            CancellationToken cancellationToken)
            => RefreshMetadataForOwnedVideo(options, copyTitleMetadata, path, GetType(), cancellationToken);

        private async Task RefreshMetadataForOwnedVideo(
            MetadataRefreshOptions options,
            bool copyTitleMetadata,
            string path,
            Type itemType,
            CancellationToken cancellationToken)
        {
            var newOptions = new MetadataRefreshOptions(options)
            {
                SearchResult = null
            };

            var id = LibraryManager.GetNewItemId(path, itemType);

            // Check if the file still exists
            if (!FileSystem.FileExists(path))
            {
                // File was removed - clean up any orphaned database entry
                if (LibraryManager.GetItemById(id) is Video orphanedVideo && orphanedVideo.OwnerId.Equals(Id))
                {
                    Logger.LogInformation("Owned video file no longer exists, removing orphaned item: {Path}", path);
                    LibraryManager.DeleteItem(orphanedVideo, new DeleteOptions { DeleteFileLocation = false });
                }

                return;
            }

            if (LibraryManager.GetItemById(id) is not Video video)
            {
                var parentFolder = GetParent() as Folder;
                var collectionType = LibraryManager.GetContentType(this);
                video = LibraryManager.ResolvePath(
                    FileSystem.GetFileSystemInfo(path),
                    parentFolder,
                    collectionType: collectionType) as Video;

                if (video is null)
                {
                    return;
                }

                // Ensure parts use the expected base type (e.g. Video, not Movie)
                if (video.GetType() != itemType && Activator.CreateInstance(itemType) is Video correctVideo)
                {
                    correctVideo.Path = video.Path;
                    correctVideo.Name = video.Name;
                    correctVideo.VideoType = video.VideoType;
                    correctVideo.ProductionYear = video.ProductionYear;
                    correctVideo.ExtraType = video.ExtraType;
                    video = correctVideo;
                }

                video.Id = id;
                video.OwnerId = Id;
                LibraryManager.CreateItem(video, parentFolder);
                newOptions.ForceSave = true;
            }

            if (video.OwnerId.IsEmpty())
            {
                video.OwnerId = Id;
            }

            await RefreshMetadataForOwnedItem(video, copyTitleMetadata, newOptions, cancellationToken).ConfigureAwait(false);
        }

        /// <inheritdoc />
        public override async Task UpdateToRepositoryAsync(ItemUpdateType updateReason, CancellationToken cancellationToken)
        {
            await base.UpdateToRepositoryAsync(updateReason, cancellationToken).ConfigureAwait(false);

            var localAlternates = LibraryManager.GetLocalAlternateVersionIds(this)
                .Select(i => LibraryManager.GetItemById(i))
                .Where(i => i is not null);

            foreach (var item in localAlternates)
            {
                item.ImageInfos = ImageInfos;
                item.Overview = Overview;
                item.ProductionYear = ProductionYear;
                item.PremiereDate = PremiereDate;
                item.CommunityRating = CommunityRating;
                item.OfficialRating = OfficialRating;
                item.Genres = Genres;
                item.ProviderIds = ProviderIds;

                await item.UpdateToRepositoryAsync(ItemUpdateType.MetadataDownload, cancellationToken).ConfigureAwait(false);
            }
        }

        public override IEnumerable<FileSystemMetadata> GetDeletePaths()
        {
            if (!IsInMixedFolder)
            {
                return new[]
                {
                    new FileSystemMetadata
                    {
                        FullName = ContainingFolderPath,
                        IsDirectory = true
                    }
                };
            }

            return base.GetDeletePaths();
        }

        public virtual MediaStream GetDefaultVideoStream()
        {
            if (!DefaultVideoStreamIndex.HasValue)
            {
                return null;
            }

            return MediaSourceManager.GetMediaStreams(new MediaStreamQuery
            {
                ItemId = Id,
                Index = DefaultVideoStreamIndex.Value
            }).FirstOrDefault();
        }

        /// <summary>
        /// Gets the ids of the items whose owned extras belong to this item.
        /// Extras are linked to a single version but need tp be surfaced for all versions.
        /// </summary>
        /// <returns>An array containing the owner ids.</returns>
        protected override Guid[] GetExtraOwnerIds()
        {
            return GetAllItemsForMediaSources()
                .Select(i => i.Item.Id)
                .Distinct()
                .ToArray();
        }

        protected override IEnumerable<(BaseItem Item, MediaSourceType MediaSourceType)> GetAllItemsForMediaSources()
        {
            var primary = PrimaryVersionId.HasValue
                ? LibraryManager.GetItemById(PrimaryVersionId.Value) as Video
                : null;

            var primaryLinked = primary is null
                ? []
                : LibraryManager.GetLinkedAlternateVersions(primary).ToList();

            // Grouping marks user-merged (splittable) sources. The primary is only such a source when
            // this video is linked onto it; for local (file-based) alternates the primary is just
            // another default source.
            var primaryType = primaryLinked.Any(i => i.Id.Equals(Id))
                ? MediaSourceType.Grouping
                : MediaSourceType.Default;

            // This video and its linked alternates, when this is itself an alternate, the primary and the primary's linked alternates.
            var grouped = new[] { ((BaseItem)this, MediaSourceType.Default) }
                .Concat(LibraryManager.GetLinkedAlternateVersions(this).Select(i => ((BaseItem)i, MediaSourceType.Grouping)))
                .Concat(primary is null
                    ? []
                    : primaryLinked.Select(i => ((BaseItem)i, MediaSourceType.Grouping)).Prepend(((BaseItem)primary, primaryType)))
                .ToList();

            // The local (file-based) alternate versions of every grouped item.
            var localAlternates = grouped
                .Select(i => i.Item1)
                .OfType<Video>()
                .SelectMany(LibraryManager.GetLocalAlternateVersionIds)
                .Select(LibraryManager.GetItemById)
                .Where(i => i is not null)
                .Select(i => (i, MediaSourceType.Default));

            // Deduplicate
            return grouped
                .Concat(localAlternates)
                .DistinctBy(i => i.Item1.Id)
                .ToList();
        }
    }
}