jellyfin/MediaBrowser.Api/Movies/MoviesService.cs
2014-03-25 17:13:55 -04:00

325 lines
13 KiB
C#

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