// <copyright file="BaseVideoResolver.cs" company="PlaceholderCompany">
// Copyright (c) PlaceholderCompany. All rights reserved.
// </copyright>

#nullable disable

#pragma warning disable CS1591

using System;
using System.IO;
using System.Linq;
using DiscUtils.Udf;
using Emby.Naming.Common;
using Emby.Naming.Video;
using MediaBrowser.Controller.Entities;
using MediaBrowser.Controller.Library;
using MediaBrowser.Controller.Providers;
using MediaBrowser.Model.Entities;
using Microsoft.Extensions.Logging;

namespace Emby.Server.Implementations.Library.Resolvers
{
    /// <summary>
    /// Resolves a Path into a Video or Video subclass.
    /// </summary>
    /// <typeparam name="T">The type of item to resolve.</typeparam>
    public abstract class BaseVideoResolver<T> : MediaBrowser.Controller.Resolvers.ItemResolver<T>
        where T : Video, new()
    {
        private readonly ILogger _logger;

        protected BaseVideoResolver(ILogger logger, NamingOptions namingOptions, IDirectoryService directoryService)
        {
            _logger = logger;
            NamingOptions = namingOptions;
            DirectoryService = directoryService;
        }

        protected NamingOptions NamingOptions { get; }

        protected IDirectoryService DirectoryService { get; }

        /// <summary>
        /// Resolves the specified args.
        /// </summary>
        /// <param name="args">The args.</param>
        /// <returns>`0.</returns>
        protected override T Resolve(ItemResolveArgs args)
        {
            return ResolveVideo<T>(args, false);
        }

        /// <summary>
        /// Resolves the video.
        /// </summary>
        /// <typeparam name="TVideoType">The type of the T video type.</typeparam>
        /// <param name="args">The args.</param>
        /// <param name="parseName">if set to <c>true</c> [parse name].</param>
        /// <returns>``0.</returns>
        protected virtual TVideoType ResolveVideo<TVideoType>(ItemResolveArgs args, bool parseName)
              where TVideoType : Video, new()
        {
            VideoFileInfo videoInfo = null;
            VideoType? videoType = null;

            // If the path is a file check for a matching extensions
            if (args.IsDirectory)
            {
                // Loop through each child file/folder and see if we find a video
                foreach (var child in args.FileSystemChildren)
                {
                    var filename = child.Name;
                    if (child.IsDirectory)
                    {
                        if (IsDvdDirectory(child.FullName, filename, DirectoryService))
                        {
                            var videoTmp = new TVideoType
                            {
                                Path = args.Path,
                                VideoType = VideoType.Dvd
                            };
                            Set3DFormat(videoTmp);
                            return videoTmp;
                        }

                        if (IsBluRayDirectory(filename))
                        {
                            var videoTmp = new TVideoType
                            {
                                Path = args.Path,
                                VideoType = VideoType.BluRay
                            };
                            Set3DFormat(videoTmp);
                            return videoTmp;
                        }
                    }
                    else if (IsDvdFile(filename))
                    {
                        videoType = VideoType.Dvd;
                    }

                    if (videoType is null)
                    {
                        continue;
                    }

                    videoInfo = VideoResolver.ResolveDirectory(args.Path, NamingOptions, parseName);
                    break;
                }
            }
            else
            {
                videoInfo = VideoResolver.Resolve(args.Path, false, NamingOptions, parseName);
            }

            if (videoInfo is null || (!videoInfo.IsStub && !VideoResolver.IsVideoFile(args.Path, NamingOptions)))
            {
                return null;
            }

            var video = new TVideoType
            {
                Name = videoInfo.Name,
                Path = args.Path,
                ProductionYear = videoInfo.Year,
                ExtraType = videoInfo.ExtraType
            };

            if (videoType.HasValue)
            {
                video.VideoType = videoType.Value;
            }
            else
            {
                SetVideoType(video, videoInfo);
            }

            Set3DFormat(video, videoInfo);

            return video;
        }

        protected void SetVideoType(Video video, VideoFileInfo videoInfo)
        {
            var extension = Path.GetExtension(video.Path.AsSpan());
            video.VideoType = extension.Equals(".iso", StringComparison.OrdinalIgnoreCase)
                              || extension.Equals(".img", StringComparison.OrdinalIgnoreCase)
                ? VideoType.Iso
                : VideoType.VideoFile;

            video.IsShortcut = extension.Equals(".strm", StringComparison.OrdinalIgnoreCase);
            video.IsPlaceHolder = videoInfo.IsStub;

            if (videoInfo.IsStub)
            {
                if (string.Equals(videoInfo.StubType, "dvd", StringComparison.OrdinalIgnoreCase))
                {
                    video.VideoType = VideoType.Dvd;
                }
                else if (string.Equals(videoInfo.StubType, "bluray", StringComparison.OrdinalIgnoreCase))
                {
                    video.VideoType = VideoType.BluRay;
                }
            }

            SetIsoType(video);
        }

        protected void SetIsoType(Video video)
        {
            if (video.VideoType == VideoType.Iso)
            {
                if (video.Path.Contains("dvd", StringComparison.OrdinalIgnoreCase))
                {
                    video.IsoType = IsoType.Dvd;
                }
                else if (video.Path.Contains("bluray", StringComparison.OrdinalIgnoreCase))
                {
                    video.IsoType = IsoType.BluRay;
                }
                else
                {
                    try
                    {
                        // use disc-utils, both DVDs and BDs use UDF filesystem
                        using var videoFileStream = File.Open(video.Path, FileMode.Open, FileAccess.Read, FileShare.Read);
                        using UdfReader udfReader = new UdfReader(videoFileStream);
                        if (udfReader.DirectoryExists("VIDEO_TS"))
                        {
                            video.IsoType = IsoType.Dvd;
                        }
                        else if (udfReader.DirectoryExists("BDMV"))
                        {
                            video.IsoType = IsoType.BluRay;
                        }
                    }
                    catch (Exception ex)
                    {
                        _logger.LogError(ex, "Error opening UDF/ISO image: {Value}", video.Path ?? video.Name);
                    }
                }
            }
        }

        protected void Set3DFormat(Video video, bool is3D, string format3D)
        {
            if (is3D)
            {
                if (string.Equals(format3D, "fsbs", StringComparison.OrdinalIgnoreCase))
                {
                    video.Video3DFormat = Video3DFormat.FullSideBySide;
                }
                else if (string.Equals(format3D, "ftab", StringComparison.OrdinalIgnoreCase))
                {
                    video.Video3DFormat = Video3DFormat.FullTopAndBottom;
                }
                else if (string.Equals(format3D, "hsbs", StringComparison.OrdinalIgnoreCase))
                {
                    video.Video3DFormat = Video3DFormat.HalfSideBySide;
                }
                else if (string.Equals(format3D, "htab", StringComparison.OrdinalIgnoreCase))
                {
                    video.Video3DFormat = Video3DFormat.HalfTopAndBottom;
                }
                else if (string.Equals(format3D, "sbs", StringComparison.OrdinalIgnoreCase))
                {
                    video.Video3DFormat = Video3DFormat.HalfSideBySide;
                }
                else if (string.Equals(format3D, "sbs3d", StringComparison.OrdinalIgnoreCase))
                {
                    video.Video3DFormat = Video3DFormat.HalfSideBySide;
                }
                else if (string.Equals(format3D, "tab", StringComparison.OrdinalIgnoreCase))
                {
                    video.Video3DFormat = Video3DFormat.HalfTopAndBottom;
                }
                else if (string.Equals(format3D, "mvc", StringComparison.OrdinalIgnoreCase))
                {
                    video.Video3DFormat = Video3DFormat.MVC;
                }
            }
        }

        protected void Set3DFormat(Video video, VideoFileInfo videoInfo)
        {
            Set3DFormat(video, videoInfo.Is3D, videoInfo.Format3D);
        }

        protected void Set3DFormat(Video video)
        {
            var result = Format3DParser.Parse(video.Path, NamingOptions);

            Set3DFormat(video, result.Is3D, result.Format3D);
        }

        /// <summary>
        /// Determines whether [is DVD directory] [the specified directory name].
        /// </summary>
        /// <param name="fullPath">The full path of the directory.</param>
        /// <param name="directoryName">The name of the directory.</param>
        /// <param name="directoryService">The directory service.</param>
        /// <returns><c>true</c> if the provided directory is a DVD directory, <c>false</c> otherwise.</returns>
        protected bool IsDvdDirectory(string fullPath, string directoryName, IDirectoryService directoryService)
        {
            if (!string.Equals(directoryName, "video_ts", StringComparison.OrdinalIgnoreCase))
            {
                return false;
            }

            return directoryService.GetFilePaths(fullPath).Any(i => Path.GetExtension(i.AsSpan()).Equals(".vob", StringComparison.OrdinalIgnoreCase));
        }

        /// <summary>
        /// Determines whether [is DVD file] [the specified name].
        /// </summary>
        /// <param name="name">The name.</param>
        /// <returns><c>true</c> if [is DVD file] [the specified name]; otherwise, <c>false</c>.</returns>
        protected bool IsDvdFile(string name)
        {
            return string.Equals(name, "video_ts.ifo", StringComparison.OrdinalIgnoreCase);
        }

        /// <summary>
        /// Determines whether [is bluray directory] [the specified directory name].
        /// </summary>
        /// <param name="directoryName">The directory name.</param>
        /// <returns>Whether the directory is a bluray directory.</returns>
        protected bool IsBluRayDirectory(string directoryName)
        {
            return string.Equals(directoryName, "bdmv", StringComparison.OrdinalIgnoreCase);
        }
    }
}
