using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Jellyfin.Api.Attributes;
using Jellyfin.Api.Constants;
using Jellyfin.Api.Extensions;
using Jellyfin.Api.Helpers;
using Jellyfin.Api.ModelBinders;
using Jellyfin.Api.Models.LibraryDtos;
using Jellyfin.Data.Entities;
using Jellyfin.Data.Enums;
using Jellyfin.Extensions;
using MediaBrowser.Common.Api;
using MediaBrowser.Common.Extensions;
using MediaBrowser.Common.Progress;
using MediaBrowser.Controller.Configuration;
using MediaBrowser.Controller.Dto;
using MediaBrowser.Controller.Entities;
using MediaBrowser.Controller.Entities.Audio;
using MediaBrowser.Controller.Entities.Movies;
using MediaBrowser.Controller.Entities.TV;
using MediaBrowser.Controller.Library;
using MediaBrowser.Controller.Providers;
using MediaBrowser.Model.Activity;
using MediaBrowser.Model.Configuration;
using MediaBrowser.Model.Dto;
using MediaBrowser.Model.Entities;
using MediaBrowser.Model.Globalization;
using MediaBrowser.Model.Net;
using MediaBrowser.Model.Querying;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Logging;

namespace Jellyfin.Api.Controllers;

/// <summary>
/// Library Controller.
/// </summary>
[Route("")]
public class LibraryController : BaseJellyfinApiController
{
    private readonly IProviderManager _providerManager;
    private readonly ILibraryManager _libraryManager;
    private readonly IUserManager _userManager;
    private readonly IDtoService _dtoService;
    private readonly IActivityManager _activityManager;
    private readonly ILocalizationManager _localization;
    private readonly ILibraryMonitor _libraryMonitor;
    private readonly ILogger<LibraryController> _logger;
    private readonly IServerConfigurationManager _serverConfigurationManager;

    /// <summary>
    /// Initializes a new instance of the <see cref="LibraryController"/> class.
    /// </summary>
    /// <param name="providerManager">Instance of the <see cref="IProviderManager"/> interface.</param>
    /// <param name="libraryManager">Instance of the <see cref="ILibraryManager"/> interface.</param>
    /// <param name="userManager">Instance of the <see cref="IUserManager"/> interface.</param>
    /// <param name="dtoService">Instance of the <see cref="IDtoService"/> interface.</param>
    /// <param name="activityManager">Instance of the <see cref="IActivityManager"/> interface.</param>
    /// <param name="localization">Instance of the <see cref="ILocalizationManager"/> interface.</param>
    /// <param name="libraryMonitor">Instance of the <see cref="ILibraryMonitor"/> interface.</param>
    /// <param name="logger">Instance of the <see cref="ILogger{LibraryController}"/> interface.</param>
    /// <param name="serverConfigurationManager">Instance of the <see cref="IServerConfigurationManager"/> interface.</param>
    public LibraryController(
        IProviderManager providerManager,
        ILibraryManager libraryManager,
        IUserManager userManager,
        IDtoService dtoService,
        IActivityManager activityManager,
        ILocalizationManager localization,
        ILibraryMonitor libraryMonitor,
        ILogger<LibraryController> logger,
        IServerConfigurationManager serverConfigurationManager)
    {
        _providerManager = providerManager;
        _libraryManager = libraryManager;
        _userManager = userManager;
        _dtoService = dtoService;
        _activityManager = activityManager;
        _localization = localization;
        _libraryMonitor = libraryMonitor;
        _logger = logger;
        _serverConfigurationManager = serverConfigurationManager;
    }

    /// <summary>
    /// Get the original file of an item.
    /// </summary>
    /// <param name="itemId">The item id.</param>
    /// <response code="200">File stream returned.</response>
    /// <response code="404">Item not found.</response>
    /// <returns>A <see cref="FileStreamResult"/> with the original file.</returns>
    [HttpGet("Items/{itemId}/File")]
    [Authorize]
    [ProducesResponseType(StatusCodes.Status200OK)]
    [ProducesResponseType(StatusCodes.Status404NotFound)]
    [ProducesFile("video/*", "audio/*")]
    public ActionResult GetFile([FromRoute, Required] Guid itemId)
    {
        var item = _libraryManager.GetItemById(itemId);
        if (item is null)
        {
            return NotFound();
        }

        return PhysicalFile(item.Path, MimeTypes.GetMimeType(item.Path), true);
    }

    /// <summary>
    /// Gets critic review for an item.
    /// </summary>
    /// <response code="200">Critic reviews returned.</response>
    /// <returns>The list of critic reviews.</returns>
    [HttpGet("Items/{itemId}/CriticReviews")]
    [Authorize]
    [Obsolete("This endpoint is obsolete.")]
    [ProducesResponseType(StatusCodes.Status200OK)]
    public ActionResult<QueryResult<BaseItemDto>> GetCriticReviews()
    {
        return new QueryResult<BaseItemDto>();
    }

    /// <summary>
    /// Get theme songs for an item.
    /// </summary>
    /// <param name="itemId">The item id.</param>
    /// <param name="userId">Optional. Filter by user id, and attach user data.</param>
    /// <param name="inheritFromParent">Optional. Determines whether or not parent items should be searched for theme media.</param>
    /// <response code="200">Theme songs returned.</response>
    /// <response code="404">Item not found.</response>
    /// <returns>The item theme songs.</returns>
    [HttpGet("Items/{itemId}/ThemeSongs")]
    [Authorize]
    [ProducesResponseType(StatusCodes.Status200OK)]
    [ProducesResponseType(StatusCodes.Status404NotFound)]
    public ActionResult<ThemeMediaResult> GetThemeSongs(
        [FromRoute, Required] Guid itemId,
        [FromQuery] Guid? userId,
        [FromQuery] bool inheritFromParent = false)
    {
        userId = RequestHelpers.GetUserId(User, userId);
        var user = userId.Value.Equals(default)
            ? null
            : _userManager.GetUserById(userId.Value);

        var item = itemId.Equals(default)
            ? (userId.Value.Equals(default)
                ? _libraryManager.RootFolder
                : _libraryManager.GetUserRootFolder())
            : _libraryManager.GetItemById(itemId);

        if (item is null)
        {
            return NotFound("Item not found.");
        }

        IEnumerable<BaseItem> themeItems;

        while (true)
        {
            themeItems = item.GetThemeSongs();

            if (themeItems.Any() || !inheritFromParent)
            {
                break;
            }

            var parent = item.GetParent();
            if (parent is null)
            {
                break;
            }

            item = parent;
        }

        var dtoOptions = new DtoOptions().AddClientFields(User);
        var items = themeItems
            .Select(i => _dtoService.GetBaseItemDto(i, dtoOptions, user, item))
            .ToArray();

        return new ThemeMediaResult
        {
            Items = items,
            TotalRecordCount = items.Length,
            OwnerId = item.Id
        };
    }

    /// <summary>
    /// Get theme videos for an item.
    /// </summary>
    /// <param name="itemId">The item id.</param>
    /// <param name="userId">Optional. Filter by user id, and attach user data.</param>
    /// <param name="inheritFromParent">Optional. Determines whether or not parent items should be searched for theme media.</param>
    /// <response code="200">Theme videos returned.</response>
    /// <response code="404">Item not found.</response>
    /// <returns>The item theme videos.</returns>
    [HttpGet("Items/{itemId}/ThemeVideos")]
    [Authorize]
    [ProducesResponseType(StatusCodes.Status200OK)]
    [ProducesResponseType(StatusCodes.Status404NotFound)]
    public ActionResult<ThemeMediaResult> GetThemeVideos(
        [FromRoute, Required] Guid itemId,
        [FromQuery] Guid? userId,
        [FromQuery] bool inheritFromParent = false)
    {
        userId = RequestHelpers.GetUserId(User, userId);
        var user = userId.Value.Equals(default)
            ? null
            : _userManager.GetUserById(userId.Value);

        var item = itemId.Equals(default)
            ? (userId.Value.Equals(default)
                ? _libraryManager.RootFolder
                : _libraryManager.GetUserRootFolder())
            : _libraryManager.GetItemById(itemId);

        if (item is null)
        {
            return NotFound("Item not found.");
        }

        IEnumerable<BaseItem> themeItems;

        while (true)
        {
            themeItems = item.GetThemeVideos();

            if (themeItems.Any() || !inheritFromParent)
            {
                break;
            }

            var parent = item.GetParent();
            if (parent is null)
            {
                break;
            }

            item = parent;
        }

        var dtoOptions = new DtoOptions().AddClientFields(User);
        var items = themeItems
            .Select(i => _dtoService.GetBaseItemDto(i, dtoOptions, user, item))
            .ToArray();

        return new ThemeMediaResult
        {
            Items = items,
            TotalRecordCount = items.Length,
            OwnerId = item.Id
        };
    }

    /// <summary>
    /// Get theme songs and videos for an item.
    /// </summary>
    /// <param name="itemId">The item id.</param>
    /// <param name="userId">Optional. Filter by user id, and attach user data.</param>
    /// <param name="inheritFromParent">Optional. Determines whether or not parent items should be searched for theme media.</param>
    /// <response code="200">Theme songs and videos returned.</response>
    /// <response code="404">Item not found.</response>
    /// <returns>The item theme videos.</returns>
    [HttpGet("Items/{itemId}/ThemeMedia")]
    [Authorize]
    [ProducesResponseType(StatusCodes.Status200OK)]
    public ActionResult<AllThemeMediaResult> GetThemeMedia(
        [FromRoute, Required] Guid itemId,
        [FromQuery] Guid? userId,
        [FromQuery] bool inheritFromParent = false)
    {
        var themeSongs = GetThemeSongs(
            itemId,
            userId,
            inheritFromParent);

        var themeVideos = GetThemeVideos(
            itemId,
            userId,
            inheritFromParent);

        if (themeSongs.Result is NotFoundObjectResult || themeVideos.Result is NotFoundObjectResult)
        {
            return NotFound();
        }

        return new AllThemeMediaResult
        {
            ThemeSongsResult = themeSongs.Value,
            ThemeVideosResult = themeVideos.Value,
            SoundtrackSongsResult = new ThemeMediaResult()
        };
    }

    /// <summary>
    /// Starts a library scan.
    /// </summary>
    /// <response code="204">Library scan started.</response>
    /// <returns>A <see cref="NoContentResult"/>.</returns>
    [HttpPost("Library/Refresh")]
    [Authorize(Policy = Policies.RequiresElevation)]
    [ProducesResponseType(StatusCodes.Status204NoContent)]
    public async Task<ActionResult> RefreshLibrary()
    {
        try
        {
            await _libraryManager.ValidateMediaLibrary(new SimpleProgress<double>(), CancellationToken.None).ConfigureAwait(false);
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Error refreshing library");
        }

        return NoContent();
    }

    /// <summary>
    /// Deletes an item from the library and filesystem.
    /// </summary>
    /// <param name="itemId">The item id.</param>
    /// <response code="204">Item deleted.</response>
    /// <response code="401">Unauthorized access.</response>
    /// <returns>A <see cref="NoContentResult"/>.</returns>
    [HttpDelete("Items/{itemId}")]
    [Authorize]
    [ProducesResponseType(StatusCodes.Status204NoContent)]
    [ProducesResponseType(StatusCodes.Status401Unauthorized)]
    [ProducesResponseType(StatusCodes.Status404NotFound)]
    public ActionResult DeleteItem(Guid itemId)
    {
        var isApiKey = User.GetIsApiKey();
        var userId = User.GetUserId();
        var user = !isApiKey && !userId.Equals(default)
            ? _userManager.GetUserById(userId) ?? throw new ResourceNotFoundException()
            : null;
        if (!isApiKey && user is null)
        {
            return Unauthorized("Unauthorized access");
        }

        var item = _libraryManager.GetItemById(itemId);
        if (item is null)
        {
            return NotFound();
        }

        if (user is not null && !item.CanDelete(user))
        {
            return Unauthorized("Unauthorized access");
        }

        _libraryManager.DeleteItem(
            item,
            new DeleteOptions { DeleteFileLocation = true },
            true);

        return NoContent();
    }

    /// <summary>
    /// Deletes items from the library and filesystem.
    /// </summary>
    /// <param name="ids">The item ids.</param>
    /// <response code="204">Items deleted.</response>
    /// <response code="401">Unauthorized access.</response>
    /// <returns>A <see cref="NoContentResult"/>.</returns>
    [HttpDelete("Items")]
    [Authorize]
    [ProducesResponseType(StatusCodes.Status204NoContent)]
    [ProducesResponseType(StatusCodes.Status401Unauthorized)]
    [ProducesResponseType(StatusCodes.Status404NotFound)]
    public ActionResult DeleteItems([FromQuery, ModelBinder(typeof(CommaDelimitedArrayModelBinder))] Guid[] ids)
    {
        var isApiKey = User.GetIsApiKey();
        var userId = User.GetUserId();
        var user = !isApiKey && !userId.Equals(default)
            ? _userManager.GetUserById(userId) ?? throw new ResourceNotFoundException()
            : null;

        if (!isApiKey && user is null)
        {
            return Unauthorized("Unauthorized access");
        }

        foreach (var i in ids)
        {
            var item = _libraryManager.GetItemById(i);
            if (item is null)
            {
                return NotFound();
            }

            if (user is not null && !item.CanDelete(user))
            {
                return Unauthorized("Unauthorized access");
            }

            _libraryManager.DeleteItem(
                item,
                new DeleteOptions { DeleteFileLocation = true },
                true);
        }

        return NoContent();
    }

    /// <summary>
    /// Get item counts.
    /// </summary>
    /// <param name="userId">Optional. Get counts from a specific user's library.</param>
    /// <param name="isFavorite">Optional. Get counts of favorite items.</param>
    /// <response code="200">Item counts returned.</response>
    /// <returns>Item counts.</returns>
    [HttpGet("Items/Counts")]
    [Authorize]
    [ProducesResponseType(StatusCodes.Status200OK)]
    public ActionResult<ItemCounts> GetItemCounts(
        [FromQuery] Guid? userId,
        [FromQuery] bool? isFavorite)
    {
        userId = RequestHelpers.GetUserId(User, userId);
        var user = userId.Value.Equals(default)
            ? null
            : _userManager.GetUserById(userId.Value);

        var counts = new ItemCounts
        {
            AlbumCount = GetCount(BaseItemKind.MusicAlbum, user, isFavorite),
            EpisodeCount = GetCount(BaseItemKind.Episode, user, isFavorite),
            MovieCount = GetCount(BaseItemKind.Movie, user, isFavorite),
            SeriesCount = GetCount(BaseItemKind.Series, user, isFavorite),
            SongCount = GetCount(BaseItemKind.Audio, user, isFavorite),
            MusicVideoCount = GetCount(BaseItemKind.MusicVideo, user, isFavorite),
            BoxSetCount = GetCount(BaseItemKind.BoxSet, user, isFavorite),
            BookCount = GetCount(BaseItemKind.Book, user, isFavorite)
        };

        return counts;
    }

    /// <summary>
    /// Gets all parents of an item.
    /// </summary>
    /// <param name="itemId">The item id.</param>
    /// <param name="userId">Optional. Filter by user id, and attach user data.</param>
    /// <response code="200">Item parents returned.</response>
    /// <response code="404">Item not found.</response>
    /// <returns>Item parents.</returns>
    [HttpGet("Items/{itemId}/Ancestors")]
    [Authorize]
    [ProducesResponseType(StatusCodes.Status200OK)]
    [ProducesResponseType(StatusCodes.Status404NotFound)]
    public ActionResult<IEnumerable<BaseItemDto>> GetAncestors([FromRoute, Required] Guid itemId, [FromQuery] Guid? userId)
    {
        var item = _libraryManager.GetItemById(itemId);
        userId = RequestHelpers.GetUserId(User, userId);

        if (item is null)
        {
            return NotFound("Item not found");
        }

        var baseItemDtos = new List<BaseItemDto>();

        var user = userId.Value.Equals(default)
            ? null
            : _userManager.GetUserById(userId.Value);

        var dtoOptions = new DtoOptions().AddClientFields(User);
        BaseItem? parent = item.GetParent();

        while (parent is not null)
        {
            if (user is not null)
            {
                parent = TranslateParentItem(parent, user);
                if (parent is null)
                {
                    break;
                }
            }

            baseItemDtos.Add(_dtoService.GetBaseItemDto(parent, dtoOptions, user));

            parent = parent.GetParent();
        }

        return baseItemDtos;
    }

    /// <summary>
    /// Gets a list of physical paths from virtual folders.
    /// </summary>
    /// <response code="200">Physical paths returned.</response>
    /// <returns>List of physical paths.</returns>
    [HttpGet("Library/PhysicalPaths")]
    [Authorize(Policy = Policies.RequiresElevation)]
    [ProducesResponseType(StatusCodes.Status200OK)]
    public ActionResult<IEnumerable<string>> GetPhysicalPaths()
    {
        return Ok(_libraryManager.RootFolder.Children
            .SelectMany(c => c.PhysicalLocations));
    }

    /// <summary>
    /// Gets all user media folders.
    /// </summary>
    /// <param name="isHidden">Optional. Filter by folders that are marked hidden, or not.</param>
    /// <response code="200">Media folders returned.</response>
    /// <returns>List of user media folders.</returns>
    [HttpGet("Library/MediaFolders")]
    [Authorize(Policy = Policies.RequiresElevation)]
    [ProducesResponseType(StatusCodes.Status200OK)]
    public ActionResult<QueryResult<BaseItemDto>> GetMediaFolders([FromQuery] bool? isHidden)
    {
        var items = _libraryManager.GetUserRootFolder().Children.Concat(_libraryManager.RootFolder.VirtualChildren).OrderBy(i => i.SortName).ToList();

        if (isHidden.HasValue)
        {
            var val = isHidden.Value;

            items = items.Where(i => i.IsHidden == val).ToList();
        }

        var dtoOptions = new DtoOptions().AddClientFields(User);
        var resultArray = _dtoService.GetBaseItemDtos(items, dtoOptions);
        return new QueryResult<BaseItemDto>(resultArray);
    }

    /// <summary>
    /// Reports that new episodes of a series have been added by an external source.
    /// </summary>
    /// <param name="tvdbId">The tvdbId.</param>
    /// <response code="204">Report success.</response>
    /// <returns>A <see cref="NoContentResult"/>.</returns>
    [HttpPost("Library/Series/Added", Name = "PostAddedSeries")]
    [HttpPost("Library/Series/Updated")]
    [Authorize]
    [ProducesResponseType(StatusCodes.Status204NoContent)]
    public ActionResult PostUpdatedSeries([FromQuery] string? tvdbId)
    {
        var series = _libraryManager.GetItemList(new InternalItemsQuery
        {
            IncludeItemTypes = new[] { BaseItemKind.Series },
            DtoOptions = new DtoOptions(false)
            {
                EnableImages = false
            }
        }).Where(i => string.Equals(tvdbId, i.GetProviderId(MediaBrowser.Model.Entities.MetadataProvider.Tvdb), StringComparison.OrdinalIgnoreCase)).ToArray();

        foreach (var item in series)
        {
            _libraryMonitor.ReportFileSystemChanged(item.Path);
        }

        return NoContent();
    }

    /// <summary>
    /// Reports that new movies have been added by an external source.
    /// </summary>
    /// <param name="tmdbId">The tmdbId.</param>
    /// <param name="imdbId">The imdbId.</param>
    /// <response code="204">Report success.</response>
    /// <returns>A <see cref="NoContentResult"/>.</returns>
    [HttpPost("Library/Movies/Added", Name = "PostAddedMovies")]
    [HttpPost("Library/Movies/Updated")]
    [Authorize]
    [ProducesResponseType(StatusCodes.Status204NoContent)]
    public ActionResult PostUpdatedMovies([FromQuery] string? tmdbId, [FromQuery] string? imdbId)
    {
        var movies = _libraryManager.GetItemList(new InternalItemsQuery
        {
            IncludeItemTypes = new[] { BaseItemKind.Movie },
            DtoOptions = new DtoOptions(false)
            {
                EnableImages = false
            }
        });

        if (!string.IsNullOrWhiteSpace(imdbId))
        {
            movies = movies.Where(i => string.Equals(imdbId, i.GetProviderId(MediaBrowser.Model.Entities.MetadataProvider.Imdb), StringComparison.OrdinalIgnoreCase)).ToList();
        }
        else if (!string.IsNullOrWhiteSpace(tmdbId))
        {
            movies = movies.Where(i => string.Equals(tmdbId, i.GetProviderId(MediaBrowser.Model.Entities.MetadataProvider.Tmdb), StringComparison.OrdinalIgnoreCase)).ToList();
        }
        else
        {
            movies = new List<BaseItem>();
        }

        foreach (var item in movies)
        {
            _libraryMonitor.ReportFileSystemChanged(item.Path);
        }

        return NoContent();
    }

    /// <summary>
    /// Reports that new movies have been added by an external source.
    /// </summary>
    /// <param name="dto">The update paths.</param>
    /// <response code="204">Report success.</response>
    /// <returns>A <see cref="NoContentResult"/>.</returns>
    [HttpPost("Library/Media/Updated")]
    [Authorize]
    [ProducesResponseType(StatusCodes.Status204NoContent)]
    public ActionResult PostUpdatedMedia([FromBody, Required] MediaUpdateInfoDto dto)
    {
        foreach (var item in dto.Updates)
        {
            _libraryMonitor.ReportFileSystemChanged(item.Path ?? throw new ArgumentException("Item path can't be null."));
        }

        return NoContent();
    }

    /// <summary>
    /// Downloads item media.
    /// </summary>
    /// <param name="itemId">The item id.</param>
    /// <response code="200">Media downloaded.</response>
    /// <response code="404">Item not found.</response>
    /// <returns>A <see cref="FileResult"/> containing the media stream.</returns>
    /// <exception cref="ArgumentException">User can't download or item can't be downloaded.</exception>
    [HttpGet("Items/{itemId}/Download")]
    [Authorize(Policy = Policies.Download)]
    [ProducesResponseType(StatusCodes.Status200OK)]
    [ProducesResponseType(StatusCodes.Status404NotFound)]
    [ProducesFile("video/*", "audio/*")]
    public async Task<ActionResult> GetDownload([FromRoute, Required] Guid itemId)
    {
        var item = _libraryManager.GetItemById(itemId);
        if (item is null)
        {
            return NotFound();
        }

        var user = _userManager.GetUserById(User.GetUserId());

        if (user is not null)
        {
            if (!item.CanDownload(user))
            {
                throw new ArgumentException("Item does not support downloading");
            }
        }
        else
        {
            if (!item.CanDownload())
            {
                throw new ArgumentException("Item does not support downloading");
            }
        }

        if (user is not null)
        {
            await LogDownloadAsync(item, user).ConfigureAwait(false);
        }

        // Quotes are valid in linux. They'll possibly cause issues here.
        var filename = Path.GetFileName(item.Path)?.Replace("\"", string.Empty, StringComparison.Ordinal);

        return PhysicalFile(item.Path, MimeTypes.GetMimeType(item.Path), filename, true);
    }

    /// <summary>
    /// Gets similar items.
    /// </summary>
    /// <param name="itemId">The item id.</param>
    /// <param name="excludeArtistIds">Exclude artist ids.</param>
    /// <param name="userId">Optional. Filter by user id, and attach user data.</param>
    /// <param name="limit">Optional. The maximum number of records to return.</param>
    /// <param name="fields">Optional. Specify additional fields of information to return in the output. This allows multiple, comma delimited. Options: Budget, Chapters, DateCreated, Genres, HomePageUrl, IndexOptions, MediaStreams, Overview, ParentId, Path, People, ProviderIds, PrimaryImageAspectRatio, Revenue, SortName, Studios, Taglines, TrailerUrls.</param>
    /// <response code="200">Similar items returned.</response>
    /// <returns>A <see cref="QueryResult{BaseItemDto}"/> containing the similar items.</returns>
    [HttpGet("Artists/{itemId}/Similar", Name = "GetSimilarArtists")]
    [HttpGet("Items/{itemId}/Similar")]
    [HttpGet("Albums/{itemId}/Similar", Name = "GetSimilarAlbums")]
    [HttpGet("Shows/{itemId}/Similar", Name = "GetSimilarShows")]
    [HttpGet("Movies/{itemId}/Similar", Name = "GetSimilarMovies")]
    [HttpGet("Trailers/{itemId}/Similar", Name = "GetSimilarTrailers")]
    [Authorize]
    [ProducesResponseType(StatusCodes.Status200OK)]
    public ActionResult<QueryResult<BaseItemDto>> GetSimilarItems(
        [FromRoute, Required] Guid itemId,
        [FromQuery, ModelBinder(typeof(CommaDelimitedArrayModelBinder))] Guid[] excludeArtistIds,
        [FromQuery] Guid? userId,
        [FromQuery] int? limit,
        [FromQuery, ModelBinder(typeof(CommaDelimitedArrayModelBinder))] ItemFields[] fields)
    {
        userId = RequestHelpers.GetUserId(User, userId);
        var item = itemId.Equals(default)
            ? (userId.Value.Equals(default)
                ? _libraryManager.RootFolder
                : _libraryManager.GetUserRootFolder())
            : _libraryManager.GetItemById(itemId);

        if (item is null)
        {
            return NotFound();
        }

        if (item is Episode || (item is IItemByName && item is not MusicArtist))
        {
            return new QueryResult<BaseItemDto>();
        }

        var user = userId.Value.Equals(default)
            ? null
            : _userManager.GetUserById(userId.Value);
        var dtoOptions = new DtoOptions { Fields = fields }
            .AddClientFields(User);

        var program = item as IHasProgramAttributes;
        bool? isMovie = item is Movie || (program is not null && program.IsMovie) || item is Trailer;
        bool? isSeries = item is Series || (program is not null && program.IsSeries);

        var includeItemTypes = new List<BaseItemKind>();
        if (isMovie.Value)
        {
            includeItemTypes.Add(BaseItemKind.Movie);
            if (_serverConfigurationManager.Configuration.EnableExternalContentInSuggestions)
            {
                includeItemTypes.Add(BaseItemKind.Trailer);
                includeItemTypes.Add(BaseItemKind.LiveTvProgram);
            }
        }
        else if (isSeries.Value)
        {
            includeItemTypes.Add(BaseItemKind.Series);
        }
        else
        {
            // For non series and movie types these columns are typically null
            // isSeries = null;
            isMovie = null;
            includeItemTypes.Add(item.GetBaseItemKind());
        }

        var query = new InternalItemsQuery(user)
        {
            Genres = item.Genres,
            Limit = limit,
            IncludeItemTypes = includeItemTypes.ToArray(),
            SimilarTo = item,
            DtoOptions = dtoOptions,
            EnableTotalRecordCount = !isMovie ?? true,
            EnableGroupByMetadataKey = isMovie ?? false,
            MinSimilarityScore = 2 // A remnant from album/artist scoring
        };

        // ExcludeArtistIds
        if (excludeArtistIds.Length != 0)
        {
            query.ExcludeArtistIds = excludeArtistIds;
        }

        List<BaseItem> itemsResult = _libraryManager.GetItemList(query);

        var returnList = _dtoService.GetBaseItemDtos(itemsResult, dtoOptions, user);

        return new QueryResult<BaseItemDto>(
            query.StartIndex,
            itemsResult.Count,
            returnList);
    }

    /// <summary>
    /// Gets the library options info.
    /// </summary>
    /// <param name="libraryContentType">Library content type.</param>
    /// <param name="isNewLibrary">Whether this is a new library.</param>
    /// <response code="200">Library options info returned.</response>
    /// <returns>Library options info.</returns>
    [HttpGet("Libraries/AvailableOptions")]
    [Authorize(Policy = Policies.FirstTimeSetupOrDefault)]
    [ProducesResponseType(StatusCodes.Status200OK)]
    public ActionResult<LibraryOptionsResultDto> GetLibraryOptionsInfo(
        [FromQuery] CollectionType? libraryContentType,
        [FromQuery] bool isNewLibrary = false)
    {
        var result = new LibraryOptionsResultDto();

        var types = GetRepresentativeItemTypes(libraryContentType);
        var typesList = types.ToList();

        var plugins = _providerManager.GetAllMetadataPlugins()
            .Where(i => types.Contains(i.ItemType, StringComparison.OrdinalIgnoreCase))
            .OrderBy(i => typesList.IndexOf(i.ItemType))
            .ToList();

        result.MetadataSavers = plugins
            .SelectMany(i => i.Plugins.Where(p => p.Type == MetadataPluginType.MetadataSaver))
            .Select(i => new LibraryOptionInfoDto
            {
                Name = i.Name,
                DefaultEnabled = IsSaverEnabledByDefault(i.Name, types, isNewLibrary)
            })
            .DistinctBy(i => i.Name, StringComparer.OrdinalIgnoreCase)
            .ToArray();

        result.MetadataReaders = plugins
            .SelectMany(i => i.Plugins.Where(p => p.Type == MetadataPluginType.LocalMetadataProvider))
            .Select(i => new LibraryOptionInfoDto
            {
                Name = i.Name,
                DefaultEnabled = true
            })
            .DistinctBy(i => i.Name, StringComparer.OrdinalIgnoreCase)
            .ToArray();

        result.SubtitleFetchers = plugins
            .SelectMany(i => i.Plugins.Where(p => p.Type == MetadataPluginType.SubtitleFetcher))
            .Select(i => new LibraryOptionInfoDto
            {
                Name = i.Name,
                DefaultEnabled = true
            })
            .DistinctBy(i => i.Name, StringComparer.OrdinalIgnoreCase)
            .ToArray();

        var typeOptions = new List<LibraryTypeOptionsDto>();

        foreach (var type in types)
        {
            TypeOptions.DefaultImageOptions.TryGetValue(type, out var defaultImageOptions);

            typeOptions.Add(new LibraryTypeOptionsDto
            {
                Type = type,

                MetadataFetchers = plugins
                    .Where(i => string.Equals(i.ItemType, type, StringComparison.OrdinalIgnoreCase))
                    .SelectMany(i => i.Plugins.Where(p => p.Type == MetadataPluginType.MetadataFetcher))
                    .Select(i => new LibraryOptionInfoDto
                    {
                        Name = i.Name,
                        DefaultEnabled = IsMetadataFetcherEnabledByDefault(i.Name, type, isNewLibrary)
                    })
                    .DistinctBy(i => i.Name, StringComparer.OrdinalIgnoreCase)
                    .ToArray(),

                ImageFetchers = plugins
                    .Where(i => string.Equals(i.ItemType, type, StringComparison.OrdinalIgnoreCase))
                    .SelectMany(i => i.Plugins.Where(p => p.Type == MetadataPluginType.ImageFetcher))
                    .Select(i => new LibraryOptionInfoDto
                    {
                        Name = i.Name,
                        DefaultEnabled = IsImageFetcherEnabledByDefault(i.Name, type, isNewLibrary)
                    })
                    .DistinctBy(i => i.Name, StringComparer.OrdinalIgnoreCase)
                    .ToArray(),

                SupportedImageTypes = plugins
                    .Where(i => string.Equals(i.ItemType, type, StringComparison.OrdinalIgnoreCase))
                    .SelectMany(i => i.SupportedImageTypes ?? Array.Empty<ImageType>())
                    .Distinct()
                    .ToArray(),

                DefaultImageOptions = defaultImageOptions ?? Array.Empty<ImageOption>()
            });
        }

        result.TypeOptions = typeOptions.ToArray();

        return result;
    }

    private int GetCount(BaseItemKind itemKind, User? user, bool? isFavorite)
    {
        var query = new InternalItemsQuery(user)
        {
            IncludeItemTypes = new[] { itemKind },
            Limit = 0,
            Recursive = true,
            IsVirtualItem = false,
            IsFavorite = isFavorite,
            DtoOptions = new DtoOptions(false)
            {
                EnableImages = false
            }
        };

        return _libraryManager.GetItemsResult(query).TotalRecordCount;
    }

    private BaseItem? TranslateParentItem(BaseItem item, User user)
    {
        return item.GetParent() is AggregateFolder
            ? _libraryManager.GetUserRootFolder().GetChildren(user, true)
                .FirstOrDefault(i => i.PhysicalLocations.Contains(item.Path))
            : item;
    }

    private async Task LogDownloadAsync(BaseItem item, User user)
    {
        try
        {
            await _activityManager.CreateAsync(new ActivityLog(
                string.Format(CultureInfo.InvariantCulture, _localization.GetLocalizedString("UserDownloadingItemWithValues"), user.Username, item.Name),
                "UserDownloadingContent",
                User.GetUserId())
            {
                ShortOverview = string.Format(CultureInfo.InvariantCulture, _localization.GetLocalizedString("AppDeviceValues"), User.GetClient(), User.GetDevice()),
            }).ConfigureAwait(false);
        }
        catch
        {
            // Logged at lower levels
        }
    }

    private static string[] GetRepresentativeItemTypes(CollectionType? contentType)
    {
        return contentType switch
        {
            CollectionType.boxsets => new[] { "BoxSet" },
            CollectionType.playlists => new[] { "Playlist" },
            CollectionType.movies => new[] { "Movie" },
            CollectionType.tvshows => new[] { "Series", "Season", "Episode" },
            CollectionType.books => new[] { "Book" },
            CollectionType.music => new[] { "MusicArtist", "MusicAlbum", "Audio", "MusicVideo" },
            CollectionType.homevideos => new[] { "Video", "Photo" },
            CollectionType.photos => new[] { "Video", "Photo" },
            CollectionType.musicvideos => new[] { "MusicVideo" },
            _ => new[] { "Series", "Season", "Episode", "Movie" }
        };
    }

    private bool IsSaverEnabledByDefault(string name, string[] itemTypes, bool isNewLibrary)
    {
        if (isNewLibrary)
        {
            return false;
        }

        var metadataOptions = _serverConfigurationManager.Configuration.MetadataOptions
            .Where(i => itemTypes.Contains(i.ItemType ?? string.Empty, StringComparison.OrdinalIgnoreCase))
            .ToArray();

        return metadataOptions.Length == 0 || metadataOptions.Any(i => !i.DisabledMetadataSavers.Contains(name, StringComparison.OrdinalIgnoreCase));
    }

    private bool IsMetadataFetcherEnabledByDefault(string name, string type, bool isNewLibrary)
    {
        if (isNewLibrary)
        {
            if (string.Equals(name, "TheMovieDb", StringComparison.OrdinalIgnoreCase))
            {
                return !(string.Equals(type, "Season", StringComparison.OrdinalIgnoreCase)
                         || string.Equals(type, "Episode", StringComparison.OrdinalIgnoreCase)
                         || string.Equals(type, "MusicVideo", StringComparison.OrdinalIgnoreCase));
            }

            return string.Equals(name, "TheTVDB", StringComparison.OrdinalIgnoreCase)
                   || string.Equals(name, "TheAudioDB", StringComparison.OrdinalIgnoreCase)
                   || string.Equals(name, "MusicBrainz", StringComparison.OrdinalIgnoreCase);
        }

        var metadataOptions = _serverConfigurationManager.GetMetadataOptionsForType(type);
        return metadataOptions is null || !metadataOptions.DisabledMetadataFetchers.Contains(name, StringComparison.OrdinalIgnoreCase);
    }

    private bool IsImageFetcherEnabledByDefault(string name, string type, bool isNewLibrary)
    {
        if (isNewLibrary)
        {
            if (string.Equals(name, "TheMovieDb", StringComparison.OrdinalIgnoreCase))
            {
                return !string.Equals(type, "Series", StringComparison.OrdinalIgnoreCase)
                       && !string.Equals(type, "Season", StringComparison.OrdinalIgnoreCase)
                       && !string.Equals(type, "Episode", StringComparison.OrdinalIgnoreCase)
                       && !string.Equals(type, "MusicVideo", StringComparison.OrdinalIgnoreCase);
            }

            return string.Equals(name, "TheTVDB", StringComparison.OrdinalIgnoreCase)
                   || string.Equals(name, "Screen Grabber", StringComparison.OrdinalIgnoreCase)
                   || string.Equals(name, "TheAudioDB", StringComparison.OrdinalIgnoreCase)
                   || string.Equals(name, "Image Extractor", StringComparison.OrdinalIgnoreCase);
        }

        var metadataOptions = _serverConfigurationManager.GetMetadataOptionsForType(type);
        return metadataOptions is null || !metadataOptions.DisabledImageFetchers.Contains(name, StringComparison.OrdinalIgnoreCase);
    }
}