using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Jellyfin.Api.Extensions;
using Jellyfin.Api.ModelBinders;
using Jellyfin.Data.Entities;
using Jellyfin.Data.Enums;
using Jellyfin.Extensions;
using MediaBrowser.Controller.Dto;
using MediaBrowser.Controller.Entities;
using MediaBrowser.Controller.Entities.Audio;
using MediaBrowser.Controller.Library;
using MediaBrowser.Controller.Lyrics;
using MediaBrowser.Controller.Providers;
using MediaBrowser.Model.Dto;
using MediaBrowser.Model.Entities;
using MediaBrowser.Model.IO;
using MediaBrowser.Model.Querying;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;

namespace Jellyfin.Api.Controllers;

/// <summary>
/// User library controller.
/// </summary>
[Route("")]
[Authorize]
public class UserLibraryController : BaseJellyfinApiController
{
    private readonly IUserManager _userManager;
    private readonly IUserDataManager _userDataRepository;
    private readonly ILibraryManager _libraryManager;
    private readonly IDtoService _dtoService;
    private readonly IUserViewManager _userViewManager;
    private readonly IFileSystem _fileSystem;
    private readonly ILyricManager _lyricManager;

    /// <summary>
    /// Initializes a new instance of the <see cref="UserLibraryController"/> class.
    /// </summary>
    /// <param name="userManager">Instance of the <see cref="IUserManager"/> interface.</param>
    /// <param name="userDataRepository">Instance of the <see cref="IUserDataManager"/> interface.</param>
    /// <param name="libraryManager">Instance of the <see cref="ILibraryManager"/> interface.</param>
    /// <param name="dtoService">Instance of the <see cref="IDtoService"/> interface.</param>
    /// <param name="userViewManager">Instance of the <see cref="IUserViewManager"/> interface.</param>
    /// <param name="fileSystem">Instance of the <see cref="IFileSystem"/> interface.</param>
    /// <param name="lyricManager">Instance of the <see cref="ILyricManager"/> interface.</param>
    public UserLibraryController(
        IUserManager userManager,
        IUserDataManager userDataRepository,
        ILibraryManager libraryManager,
        IDtoService dtoService,
        IUserViewManager userViewManager,
        IFileSystem fileSystem,
        ILyricManager lyricManager)
    {
        _userManager = userManager;
        _userDataRepository = userDataRepository;
        _libraryManager = libraryManager;
        _dtoService = dtoService;
        _userViewManager = userViewManager;
        _fileSystem = fileSystem;
        _lyricManager = lyricManager;
    }

    /// <summary>
    /// Gets an item from a user's library.
    /// </summary>
    /// <param name="userId">User id.</param>
    /// <param name="itemId">Item id.</param>
    /// <response code="200">Item returned.</response>
    /// <returns>An <see cref="OkResult"/> containing the item.</returns>
    [HttpGet("Users/{userId}/Items/{itemId}")]
    [ProducesResponseType(StatusCodes.Status200OK)]
    public async Task<ActionResult<BaseItemDto>> GetItem([FromRoute, Required] Guid userId, [FromRoute, Required] Guid itemId)
    {
        var user = _userManager.GetUserById(userId);
        if (user is null)
        {
            return NotFound();
        }

        var item = itemId.IsEmpty()
            ? _libraryManager.GetUserRootFolder()
            : _libraryManager.GetItemById(itemId);

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

        if (item is not UserRootFolder
            // Check the item is visible for the user
            && !item.IsVisible(user))
        {
            return Unauthorized($"{user.Username} is not permitted to access item {item.Name}.");
        }

        await RefreshItemOnDemandIfNeeded(item).ConfigureAwait(false);

        var dtoOptions = new DtoOptions().AddClientFields(User);

        return _dtoService.GetBaseItemDto(item, dtoOptions, user);
    }

    /// <summary>
    /// Gets the root folder from a user's library.
    /// </summary>
    /// <param name="userId">User id.</param>
    /// <response code="200">Root folder returned.</response>
    /// <returns>An <see cref="OkResult"/> containing the user's root folder.</returns>
    [HttpGet("Users/{userId}/Items/Root")]
    [ProducesResponseType(StatusCodes.Status200OK)]
    public ActionResult<BaseItemDto> GetRootFolder([FromRoute, Required] Guid userId)
    {
        var user = _userManager.GetUserById(userId);
        if (user is null)
        {
            return NotFound();
        }

        var item = _libraryManager.GetUserRootFolder();
        var dtoOptions = new DtoOptions().AddClientFields(User);
        return _dtoService.GetBaseItemDto(item, dtoOptions, user);
    }

    /// <summary>
    /// Gets intros to play before the main media item plays.
    /// </summary>
    /// <param name="userId">User id.</param>
    /// <param name="itemId">Item id.</param>
    /// <response code="200">Intros returned.</response>
    /// <returns>An <see cref="OkResult"/> containing the intros to play.</returns>
    [HttpGet("Users/{userId}/Items/{itemId}/Intros")]
    [ProducesResponseType(StatusCodes.Status200OK)]
    public async Task<ActionResult<QueryResult<BaseItemDto>>> GetIntros([FromRoute, Required] Guid userId, [FromRoute, Required] Guid itemId)
    {
        var user = _userManager.GetUserById(userId);
        if (user is null)
        {
            return NotFound();
        }

        var item = itemId.IsEmpty()
            ? _libraryManager.GetUserRootFolder()
            : _libraryManager.GetItemById(itemId);

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

        if (item is not UserRootFolder
            // Check the item is visible for the user
            && !item.IsVisible(user))
        {
            return Unauthorized($"{user.Username} is not permitted to access item {item.Name}.");
        }

        var items = await _libraryManager.GetIntros(item, user).ConfigureAwait(false);
        var dtoOptions = new DtoOptions().AddClientFields(User);
        var dtos = items.Select(i => _dtoService.GetBaseItemDto(i, dtoOptions, user)).ToArray();

        return new QueryResult<BaseItemDto>(dtos);
    }

    /// <summary>
    /// Marks an item as a favorite.
    /// </summary>
    /// <param name="userId">User id.</param>
    /// <param name="itemId">Item id.</param>
    /// <response code="200">Item marked as favorite.</response>
    /// <returns>An <see cref="OkResult"/> containing the <see cref="UserItemDataDto"/>.</returns>
    [HttpPost("Users/{userId}/FavoriteItems/{itemId}")]
    [ProducesResponseType(StatusCodes.Status200OK)]
    public ActionResult<UserItemDataDto> MarkFavoriteItem([FromRoute, Required] Guid userId, [FromRoute, Required] Guid itemId)
    {
        var user = _userManager.GetUserById(userId);
        if (user is null)
        {
            return NotFound();
        }

        var item = itemId.IsEmpty()
            ? _libraryManager.GetUserRootFolder()
            : _libraryManager.GetItemById(itemId);

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

        if (item is not UserRootFolder
            // Check the item is visible for the user
            && !item.IsVisible(user))
        {
            return Unauthorized($"{user.Username} is not permitted to access item {item.Name}.");
        }

        return MarkFavorite(user, item, true);
    }

    /// <summary>
    /// Unmarks item as a favorite.
    /// </summary>
    /// <param name="userId">User id.</param>
    /// <param name="itemId">Item id.</param>
    /// <response code="200">Item unmarked as favorite.</response>
    /// <returns>An <see cref="OkResult"/> containing the <see cref="UserItemDataDto"/>.</returns>
    [HttpDelete("Users/{userId}/FavoriteItems/{itemId}")]
    [ProducesResponseType(StatusCodes.Status200OK)]
    public ActionResult<UserItemDataDto> UnmarkFavoriteItem([FromRoute, Required] Guid userId, [FromRoute, Required] Guid itemId)
    {
        var user = _userManager.GetUserById(userId);
        if (user is null)
        {
            return NotFound();
        }

        var item = itemId.IsEmpty()
            ? _libraryManager.GetUserRootFolder()
            : _libraryManager.GetItemById(itemId);

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

        if (item is not UserRootFolder
            // Check the item is visible for the user
            && !item.IsVisible(user))
        {
            return Unauthorized($"{user.Username} is not permitted to access item {item.Name}.");
        }

        return MarkFavorite(user, item, false);
    }

    /// <summary>
    /// Deletes a user's saved personal rating for an item.
    /// </summary>
    /// <param name="userId">User id.</param>
    /// <param name="itemId">Item id.</param>
    /// <response code="200">Personal rating removed.</response>
    /// <returns>An <see cref="OkResult"/> containing the <see cref="UserItemDataDto"/>.</returns>
    [HttpDelete("Users/{userId}/Items/{itemId}/Rating")]
    [ProducesResponseType(StatusCodes.Status200OK)]
    public ActionResult<UserItemDataDto> DeleteUserItemRating([FromRoute, Required] Guid userId, [FromRoute, Required] Guid itemId)
    {
        var user = _userManager.GetUserById(userId);
        if (user is null)
        {
            return NotFound();
        }

        var item = itemId.IsEmpty()
            ? _libraryManager.GetUserRootFolder()
            : _libraryManager.GetItemById(itemId);

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

        if (item is not UserRootFolder
            // Check the item is visible for the user
            && !item.IsVisible(user))
        {
            return Unauthorized($"{user.Username} is not permitted to access item {item.Name}.");
        }

        return UpdateUserItemRatingInternal(user, item, null);
    }

    /// <summary>
    /// Updates a user's rating for an item.
    /// </summary>
    /// <param name="userId">User id.</param>
    /// <param name="itemId">Item id.</param>
    /// <param name="likes">Whether this <see cref="UpdateUserItemRating" /> is likes.</param>
    /// <response code="200">Item rating updated.</response>
    /// <returns>An <see cref="OkResult"/> containing the <see cref="UserItemDataDto"/>.</returns>
    [HttpPost("Users/{userId}/Items/{itemId}/Rating")]
    [ProducesResponseType(StatusCodes.Status200OK)]
    public ActionResult<UserItemDataDto> UpdateUserItemRating([FromRoute, Required] Guid userId, [FromRoute, Required] Guid itemId, [FromQuery] bool? likes)
    {
        var user = _userManager.GetUserById(userId);
        if (user is null)
        {
            return NotFound();
        }

        var item = itemId.IsEmpty()
            ? _libraryManager.GetUserRootFolder()
            : _libraryManager.GetItemById(itemId);

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

        if (item is not UserRootFolder
            // Check the item is visible for the user
            && !item.IsVisible(user))
        {
            return Unauthorized($"{user.Username} is not permitted to access item {item.Name}.");
        }

        return UpdateUserItemRatingInternal(user, item, likes);
    }

    /// <summary>
    /// Gets local trailers for an item.
    /// </summary>
    /// <param name="userId">User id.</param>
    /// <param name="itemId">Item id.</param>
    /// <response code="200">An <see cref="OkResult"/> containing the item's local trailers.</response>
    /// <returns>The items local trailers.</returns>
    [HttpGet("Users/{userId}/Items/{itemId}/LocalTrailers")]
    [ProducesResponseType(StatusCodes.Status200OK)]
    public ActionResult<IEnumerable<BaseItemDto>> GetLocalTrailers([FromRoute, Required] Guid userId, [FromRoute, Required] Guid itemId)
    {
        var user = _userManager.GetUserById(userId);
        if (user is null)
        {
            return NotFound();
        }

        var item = itemId.IsEmpty()
            ? _libraryManager.GetUserRootFolder()
            : _libraryManager.GetItemById(itemId);

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

        if (item is not UserRootFolder
            // Check the item is visible for the user
            && !item.IsVisible(user))
        {
            return Unauthorized($"{user.Username} is not permitted to access item {item.Name}.");
        }

        var dtoOptions = new DtoOptions().AddClientFields(User);
        if (item is IHasTrailers hasTrailers)
        {
            var trailers = hasTrailers.LocalTrailers;
            return Ok(_dtoService.GetBaseItemDtos(trailers, dtoOptions, user, item).AsEnumerable());
        }

        return Ok(item.GetExtras()
            .Where(e => e.ExtraType == ExtraType.Trailer)
            .Select(i => _dtoService.GetBaseItemDto(i, dtoOptions, user, item)));
    }

    /// <summary>
    /// Gets special features for an item.
    /// </summary>
    /// <param name="userId">User id.</param>
    /// <param name="itemId">Item id.</param>
    /// <response code="200">Special features returned.</response>
    /// <returns>An <see cref="OkResult"/> containing the special features.</returns>
    [HttpGet("Users/{userId}/Items/{itemId}/SpecialFeatures")]
    [ProducesResponseType(StatusCodes.Status200OK)]
    public ActionResult<IEnumerable<BaseItemDto>> GetSpecialFeatures([FromRoute, Required] Guid userId, [FromRoute, Required] Guid itemId)
    {
        var user = _userManager.GetUserById(userId);
        if (user is null)
        {
            return NotFound();
        }

        var item = itemId.IsEmpty()
            ? _libraryManager.GetUserRootFolder()
            : _libraryManager.GetItemById(itemId);

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

        if (item is not UserRootFolder
            // Check the item is visible for the user
            && !item.IsVisible(user))
        {
            return Unauthorized($"{user.Username} is not permitted to access item {item.Name}.");
        }

        var dtoOptions = new DtoOptions().AddClientFields(User);

        return Ok(item
            .GetExtras()
            .Where(i => i.ExtraType.HasValue && BaseItem.DisplayExtraTypes.Contains(i.ExtraType.Value))
            .Select(i => _dtoService.GetBaseItemDto(i, dtoOptions, user, item)));
    }

    /// <summary>
    /// Gets latest media.
    /// </summary>
    /// <param name="userId">User id.</param>
    /// <param name="parentId">Specify this to localize the search to a specific item or folder. Omit to use the root.</param>
    /// <param name="fields">Optional. Specify additional fields of information to return in the output.</param>
    /// <param name="includeItemTypes">Optional. If specified, results will be filtered based on item type. This allows multiple, comma delimited.</param>
    /// <param name="isPlayed">Filter by items that are played, or not.</param>
    /// <param name="enableImages">Optional. include image information in output.</param>
    /// <param name="imageTypeLimit">Optional. the max number of images to return, per image type.</param>
    /// <param name="enableImageTypes">Optional. The image types to include in the output.</param>
    /// <param name="enableUserData">Optional. include user data.</param>
    /// <param name="limit">Return item limit.</param>
    /// <param name="groupItems">Whether or not to group items into a parent container.</param>
    /// <response code="200">Latest media returned.</response>
    /// <returns>An <see cref="OkResult"/> containing the latest media.</returns>
    [HttpGet("Users/{userId}/Items/Latest")]
    [ProducesResponseType(StatusCodes.Status200OK)]
    public ActionResult<IEnumerable<BaseItemDto>> GetLatestMedia(
        [FromRoute, Required] Guid userId,
        [FromQuery] Guid? parentId,
        [FromQuery, ModelBinder(typeof(CommaDelimitedArrayModelBinder))] ItemFields[] fields,
        [FromQuery, ModelBinder(typeof(CommaDelimitedArrayModelBinder))] BaseItemKind[] includeItemTypes,
        [FromQuery] bool? isPlayed,
        [FromQuery] bool? enableImages,
        [FromQuery] int? imageTypeLimit,
        [FromQuery, ModelBinder(typeof(CommaDelimitedArrayModelBinder))] ImageType[] enableImageTypes,
        [FromQuery] bool? enableUserData,
        [FromQuery] int limit = 20,
        [FromQuery] bool groupItems = true)
    {
        var user = _userManager.GetUserById(userId);
        if (user is null)
        {
            return NotFound();
        }

        if (!isPlayed.HasValue)
        {
            if (user.HidePlayedInLatest)
            {
                isPlayed = false;
            }
        }

        var dtoOptions = new DtoOptions { Fields = fields }
            .AddClientFields(User)
            .AddAdditionalDtoOptions(enableImages, enableUserData, imageTypeLimit, enableImageTypes);

        var list = _userViewManager.GetLatestItems(
            new LatestItemsQuery
            {
                GroupItems = groupItems,
                IncludeItemTypes = includeItemTypes,
                IsPlayed = isPlayed,
                Limit = limit,
                ParentId = parentId ?? Guid.Empty,
                UserId = userId,
            },
            dtoOptions);

        var dtos = list.Select(i =>
        {
            var item = i.Item2[0];
            var childCount = 0;

            if (i.Item1 is not null && (i.Item2.Count > 1 || i.Item1 is MusicAlbum))
            {
                item = i.Item1;
                childCount = i.Item2.Count;
            }

            var dto = _dtoService.GetBaseItemDto(item, dtoOptions, user);

            dto.ChildCount = childCount;

            return dto;
        });

        return Ok(dtos);
    }

    private async Task RefreshItemOnDemandIfNeeded(BaseItem item)
    {
        if (item is Person)
        {
            var hasMetdata = !string.IsNullOrWhiteSpace(item.Overview) && item.HasImage(ImageType.Primary);
            var performFullRefresh = !hasMetdata && (DateTime.UtcNow - item.DateLastRefreshed).TotalDays >= 3;

            if (!hasMetdata)
            {
                var options = new MetadataRefreshOptions(new DirectoryService(_fileSystem))
                {
                    MetadataRefreshMode = MetadataRefreshMode.FullRefresh,
                    ImageRefreshMode = MetadataRefreshMode.FullRefresh,
                    ForceSave = performFullRefresh
                };

                await item.RefreshMetadata(options, CancellationToken.None).ConfigureAwait(false);
            }
        }
    }

    /// <summary>
    /// Marks the favorite.
    /// </summary>
    /// <param name="user">The user.</param>
    /// <param name="item">The item.</param>
    /// <param name="isFavorite">if set to <c>true</c> [is favorite].</param>
    private UserItemDataDto MarkFavorite(User user, BaseItem item, bool isFavorite)
    {
        // Get the user data for this item
        var data = _userDataRepository.GetUserData(user, item);

        // Set favorite status
        data.IsFavorite = isFavorite;

        _userDataRepository.SaveUserData(user, item, data, UserDataSaveReason.UpdateUserRating, CancellationToken.None);

        return _userDataRepository.GetUserDataDto(item, user);
    }

    /// <summary>
    /// Updates the user item rating.
    /// </summary>
    /// <param name="user">The user.</param>
    /// <param name="item">The item.</param>
    /// <param name="likes">if set to <c>true</c> [likes].</param>
    private UserItemDataDto UpdateUserItemRatingInternal(User user, BaseItem item, bool? likes)
    {
        // Get the user data for this item
        var data = _userDataRepository.GetUserData(user, item);

        data.Likes = likes;

        _userDataRepository.SaveUserData(user, item, data, UserDataSaveReason.UpdateUserRating, CancellationToken.None);

        return _userDataRepository.GetUserDataDto(item, user);
    }

    /// <summary>
    /// Gets an item's lyrics.
    /// </summary>
    /// <param name="userId">User id.</param>
    /// <param name="itemId">Item id.</param>
    /// <response code="200">Lyrics returned.</response>
    /// <response code="404">Something went wrong. No Lyrics will be returned.</response>
    /// <returns>An <see cref="OkResult"/> containing the item's lyrics.</returns>
    [HttpGet("Users/{userId}/Items/{itemId}/Lyrics")]
    [ProducesResponseType(StatusCodes.Status200OK)]
    public async Task<ActionResult<LyricResponse>> GetLyrics([FromRoute, Required] Guid userId, [FromRoute, Required] Guid itemId)
    {
        var user = _userManager.GetUserById(userId);

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

        var item = itemId.IsEmpty()
            ? _libraryManager.GetUserRootFolder()
            : _libraryManager.GetItemById(itemId);

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

        if (item is not UserRootFolder
            // Check the item is visible for the user
            && !item.IsVisible(user))
        {
            return Unauthorized($"{user.Username} is not permitted to access item {item.Name}.");
        }

        var result = await _lyricManager.GetLyrics(item).ConfigureAwait(false);
        if (result is not null)
        {
            return Ok(result);
        }

        return NotFound();
    }
}