325 lines
13 KiB
C#
325 lines
13 KiB
C#
using MediaBrowser.Common.Extensions;
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using MediaBrowser.Controller.Dto;
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using MediaBrowser.Controller.Entities;
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using MediaBrowser.Controller.Entities.Movies;
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using MediaBrowser.Controller.Library;
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using MediaBrowser.Controller.Persistence;
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using MediaBrowser.Model.Dto;
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using MediaBrowser.Model.Entities;
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using MediaBrowser.Model.Querying;
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using ServiceStack;
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using System;
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using System.Collections.Generic;
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using System.Linq;
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namespace MediaBrowser.Api.Movies
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{
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/// <summary>
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/// Class GetSimilarMovies
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/// </summary>
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[Route("/Movies/{Id}/Similar", "GET", Summary = "Finds movies and trailers similar to a given movie.")]
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public class GetSimilarMovies : BaseGetSimilarItemsFromItem
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{
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[ApiMember(Name = "IncludeTrailers", Description = "Whether or not to include trailers within the results. Defaults to true.", IsRequired = false, DataType = "bool", ParameterType = "query", Verb = "GET")]
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public bool IncludeTrailers { get; set; }
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public GetSimilarMovies()
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{
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IncludeTrailers = true;
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}
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}
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[Route("/Movies/Recommendations", "GET", Summary = "Gets movie recommendations")]
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public class GetMovieRecommendations : IReturn<RecommendationDto[]>, IHasItemFields
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{
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[ApiMember(Name = "CategoryLimit", Description = "The max number of categories to return", IsRequired = false, DataType = "int", ParameterType = "query", Verb = "GET")]
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public int CategoryLimit { get; set; }
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[ApiMember(Name = "ItemLimit", Description = "The max number of items to return per category", IsRequired = false, DataType = "int", ParameterType = "query", Verb = "GET")]
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public int ItemLimit { get; set; }
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/// <summary>
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/// Gets or sets the user id.
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/// </summary>
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/// <value>The user id.</value>
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[ApiMember(Name = "UserId", Description = "Optional. Filter by user id, and attach user data", IsRequired = false, DataType = "string", ParameterType = "query", Verb = "GET")]
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public Guid? UserId { get; set; }
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public GetMovieRecommendations()
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{
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CategoryLimit = 5;
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ItemLimit = 8;
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}
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public string Fields { get; set; }
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}
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/// <summary>
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/// Class MoviesService
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/// </summary>
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public class MoviesService : BaseApiService
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{
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/// <summary>
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/// The _user manager
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/// </summary>
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private readonly IUserManager _userManager;
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/// <summary>
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/// The _user data repository
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/// </summary>
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private readonly IUserDataManager _userDataRepository;
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/// <summary>
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/// The _library manager
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/// </summary>
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private readonly ILibraryManager _libraryManager;
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private readonly IItemRepository _itemRepo;
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private readonly IDtoService _dtoService;
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/// <summary>
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/// Initializes a new instance of the <see cref="MoviesService"/> class.
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/// </summary>
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/// <param name="userManager">The user manager.</param>
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/// <param name="userDataRepository">The user data repository.</param>
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/// <param name="libraryManager">The library manager.</param>
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public MoviesService(IUserManager userManager, IUserDataManager userDataRepository, ILibraryManager libraryManager, IItemRepository itemRepo, IDtoService dtoService)
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{
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_userManager = userManager;
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_userDataRepository = userDataRepository;
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_libraryManager = libraryManager;
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_itemRepo = itemRepo;
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_dtoService = dtoService;
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}
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/// <summary>
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/// Gets the specified request.
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/// </summary>
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/// <param name="request">The request.</param>
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/// <returns>System.Object.</returns>
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public object Get(GetSimilarMovies request)
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{
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var result = SimilarItemsHelper.GetSimilarItemsResult(_userManager,
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_itemRepo,
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_libraryManager,
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_userDataRepository,
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_dtoService,
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Logger,
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// Strip out secondary versions
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request, item => (item is Movie || (item is Trailer && request.IncludeTrailers)) && !((Video)item).PrimaryVersionId.HasValue,
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SimilarItemsHelper.GetSimiliarityScore);
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return ToOptimizedSerializedResultUsingCache(result);
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}
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public object Get(GetMovieRecommendations request)
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{
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var user = _userManager.GetUserById(request.UserId.Value);
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var movies = user.RootFolder.GetRecursiveChildren(user).OfType<Movie>().ToList();
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var result = GetRecommendationCategories(user, movies, request.CategoryLimit, request.ItemLimit, request.GetItemFields().ToList());
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return ToOptimizedResult(result);
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}
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private IEnumerable<RecommendationDto> GetRecommendationCategories(User user, List<Movie> allMovies, int categoryLimit, int itemLimit, List<ItemFields> fields)
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{
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var categories = new List<RecommendationDto>();
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var recentlyPlayedMovies = allMovies
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.Select(i =>
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{
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var userdata = _userDataRepository.GetUserData(user.Id, i.GetUserDataKey());
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return new Tuple<Movie, bool, DateTime>(i, userdata.Played, userdata.LastPlayedDate ?? DateTime.MinValue);
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})
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.Where(i => i.Item2)
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.OrderByDescending(i => i.Item3)
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.Select(i => i.Item1)
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.ToList();
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var excludeFromLiked = recentlyPlayedMovies.Take(10);
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var likedMovies = allMovies
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.Select(i =>
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{
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var score = 0;
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var userData = _userDataRepository.GetUserData(user.Id, i.GetUserDataKey());
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if (userData.IsFavorite)
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{
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score = 2;
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}
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else
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{
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score = userData.Likes.HasValue ? userData.Likes.Value ? 1 : -1 : 0;
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}
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return new Tuple<Movie, int>(i, score);
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})
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.OrderByDescending(i => i.Item2)
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.ThenBy(i => Guid.NewGuid())
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.Where(i => i.Item2 > 0)
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.Select(i => i.Item1)
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.Where(i => !excludeFromLiked.Contains(i));
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var mostRecentMovies = recentlyPlayedMovies.Take(6).ToList();
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// Get recently played directors
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var recentDirectors = GetDirectors(mostRecentMovies)
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.OrderBy(i => Guid.NewGuid())
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.ToList();
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// Get recently played actors
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var recentActors = GetActors(mostRecentMovies)
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.OrderBy(i => Guid.NewGuid())
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.ToList();
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var similarToRecentlyPlayed = GetSimilarTo(user, allMovies, recentlyPlayedMovies.Take(7).OrderBy(i => Guid.NewGuid()), itemLimit, fields, RecommendationType.SimilarToRecentlyPlayed).GetEnumerator();
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var similarToLiked = GetSimilarTo(user, allMovies, likedMovies, itemLimit, fields, RecommendationType.SimilarToLikedItem).GetEnumerator();
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var hasDirectorFromRecentlyPlayed = GetWithDirector(user, allMovies, recentDirectors, itemLimit, fields, RecommendationType.HasDirectorFromRecentlyPlayed).GetEnumerator();
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var hasActorFromRecentlyPlayed = GetWithActor(user, allMovies, recentActors, itemLimit, fields, RecommendationType.HasActorFromRecentlyPlayed).GetEnumerator();
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var categoryTypes = new List<IEnumerator<RecommendationDto>>
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{
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// Give this extra weight
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similarToRecentlyPlayed,
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similarToRecentlyPlayed,
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// Give this extra weight
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similarToLiked,
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similarToLiked,
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hasDirectorFromRecentlyPlayed,
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hasActorFromRecentlyPlayed
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};
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while (categories.Count < categoryLimit)
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{
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var allEmpty = true;
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foreach (var category in categoryTypes)
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{
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if (category.MoveNext())
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{
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categories.Add(category.Current);
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allEmpty = false;
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if (categories.Count >= categoryLimit)
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{
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break;
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}
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}
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}
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if (allEmpty)
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{
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break;
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}
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}
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//// Get the lead actor for all movies
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//var allActors = GetActors(allMovies)
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// .ToList();
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//foreach (var actor in recentActors)
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//{
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//}
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return categories.OrderBy(i => i.RecommendationType).ThenBy(i => Guid.NewGuid());
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}
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private IEnumerable<RecommendationDto> GetWithDirector(User user, List<Movie> allMovies, IEnumerable<string> directors, int itemLimit, List<ItemFields> fields, RecommendationType type)
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{
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var userId = user.Id;
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foreach (var director in directors)
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{
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var items = allMovies
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.Where(i => !_userDataRepository.GetUserData(userId, i.GetUserDataKey()).Played && i.People.Any(p => string.Equals(p.Type, PersonType.Director, StringComparison.OrdinalIgnoreCase) && string.Equals(p.Name, director, StringComparison.OrdinalIgnoreCase)))
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.Take(itemLimit)
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.ToList();
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if (items.Count > 0)
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{
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yield return new RecommendationDto
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{
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BaselineItemName = director,
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CategoryId = director.GetMD5().ToString("N"),
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RecommendationType = type,
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Items = items.Select(i => _dtoService.GetBaseItemDto(i, fields, user)).ToArray()
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};
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}
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}
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}
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private IEnumerable<RecommendationDto> GetWithActor(User user, List<Movie> allMovies, IEnumerable<string> names, int itemLimit, List<ItemFields> fields, RecommendationType type)
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{
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var userId = user.Id;
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foreach (var name in names)
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{
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var items = allMovies
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.Where(i => !_userDataRepository.GetUserData(userId, i.GetUserDataKey()).Played && i.People.Any(p => string.Equals(p.Name, name, StringComparison.OrdinalIgnoreCase)))
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.Take(itemLimit)
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.ToList();
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if (items.Count > 0)
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{
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yield return new RecommendationDto
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{
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BaselineItemName = name,
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CategoryId = name.GetMD5().ToString("N"),
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RecommendationType = type,
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Items = items.Select(i => _dtoService.GetBaseItemDto(i, fields, user)).ToArray()
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};
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}
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}
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}
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private IEnumerable<RecommendationDto> GetSimilarTo(User user, List<Movie> allMovies, IEnumerable<Movie> baselineItems, int itemLimit, List<ItemFields> fields, RecommendationType type)
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{
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var userId = user.Id;
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foreach (var item in baselineItems)
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{
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var similar = SimilarItemsHelper
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.GetSimilaritems(item, allMovies, SimilarItemsHelper.GetSimiliarityScore)
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.Where(i => !_userDataRepository.GetUserData(userId, i.GetUserDataKey()).Played)
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.Take(itemLimit)
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.ToList();
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if (similar.Count > 0)
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{
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yield return new RecommendationDto
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{
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BaselineItemName = item.Name,
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CategoryId = item.Id.ToString("N"),
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RecommendationType = type,
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Items = similar.Select(i => _dtoService.GetBaseItemDto(i, fields, user)).ToArray()
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};
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}
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}
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}
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private IEnumerable<string> GetActors(IEnumerable<BaseItem> items)
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{
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// Get the two leading actors for all movies
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return items
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.SelectMany(i => i.People.Where(p => !string.Equals(PersonType.Director, p.Type, StringComparison.OrdinalIgnoreCase)).Take(2))
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.Select(i => i.Name)
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.Distinct(StringComparer.OrdinalIgnoreCase);
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}
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private IEnumerable<string> GetDirectors(IEnumerable<BaseItem> items)
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{
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return items
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.Select(i => i.People.FirstOrDefault(p => string.Equals(PersonType.Director, p.Type, StringComparison.OrdinalIgnoreCase)))
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.Where(i => i != null)
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.Select(i => i.Name)
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.Distinct(StringComparer.OrdinalIgnoreCase);
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}
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}
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}
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