add multiselect and movie tags (#62)

* add basic selection behavior to search results

* add search scrolling, selection actions

* include shows in multiselect

* multiselect movies, shows, collection items

* add movie and show tags

* code cleanup

* update show screenshot

ErsatzTV.Application/MediaCards/Queries/GetSearchCardsHandler.cs

@@ -18,9 +18,12 @@ namespace ErsatzTV.Application.MediaCards.Queries
         public Task<Either<BaseError, SearchCardResultsViewModel>> Handle(
             GetSearchCards request,
             CancellationToken cancellationToken) =>
-            request.Query.StartsWith("genre:")
-                ? GenreSearch(request.Query.Replace("genre:", string.Empty))
-                : TitleSearch(request.Query);
+            request.Query.Split(":").Head() switch
+            {
+                "genre" => GenreSearch(request.Query.Replace("genre:", string.Empty)),
+                "tag" => TagSearch(request.Query.Replace("tag:", string.Empty)),
+                _ => TitleSearch(request.Query)
+            };
 
         private Task<Either<BaseError, SearchCardResultsViewModel>> TitleSearch(string query) =>
             Try(_searchRepository.SearchMediaItemsByTitle(query)).Sequence()
@@ -31,5 +34,10 @@ namespace ErsatzTV.Application.MediaCards.Queries
             Try(_searchRepository.SearchMediaItemsByGenre(query)).Sequence()
                 .Map(ProjectToSearchResults)
                 .Map(t => t.ToEither(ex => BaseError.New($"Failed to search: {ex.Message}")));
+
+        private Task<Either<BaseError, SearchCardResultsViewModel>> TagSearch(string query) =>
+            Try(_searchRepository.SearchMediaItemsByTag(query)).Sequence()
+                .Map(ProjectToSearchResults)
+                .Map(t => t.ToEither(ex => BaseError.New($"Failed to search: {ex.Message}")));
     }
 }

ErsatzTV.Application/MediaCollections/Commands/AddItemsToCollection.cs

@@ -0,0 +1,9 @@
+using System.Collections.Generic;
+using ErsatzTV.Core;
+using LanguageExt;
+
+namespace ErsatzTV.Application.MediaCollections.Commands
+{
+    public record AddItemsToCollection
+        (int CollectionId, List<int> MovieIds, List<int> ShowIds) : MediatR.IRequest<Either<BaseError, Unit>>;
+}

ErsatzTV.Application/MediaCollections/Commands/AddItemsToCollectionHandler.cs

@@ -0,0 +1,80 @@
+using System.Linq;
+using System.Threading;
+using System.Threading.Channels;
+using System.Threading.Tasks;
+using ErsatzTV.Application.Playouts.Commands;
+using ErsatzTV.Core;
+using ErsatzTV.Core.Interfaces.Repositories;
+using LanguageExt;
+using static LanguageExt.Prelude;
+
+namespace ErsatzTV.Application.MediaCollections.Commands
+{
+    public class
+        AddItemsToCollectionHandler : MediatR.IRequestHandler<AddItemsToCollection, Either<BaseError, Unit>>
+    {
+        private readonly ChannelWriter<IBackgroundServiceRequest> _channel;
+        private readonly IMediaCollectionRepository _mediaCollectionRepository;
+        private readonly IMovieRepository _movieRepository;
+        private readonly ITelevisionRepository _televisionRepository;
+
+        public AddItemsToCollectionHandler(
+            IMediaCollectionRepository mediaCollectionRepository,
+            IMovieRepository movieRepository,
+            ITelevisionRepository televisionRepository,
+            ChannelWriter<IBackgroundServiceRequest> channel)
+        {
+            _mediaCollectionRepository = mediaCollectionRepository;
+            _movieRepository = movieRepository;
+            _televisionRepository = televisionRepository;
+            _channel = channel;
+        }
+
+        public Task<Either<BaseError, Unit>> Handle(
+            AddItemsToCollection request,
+            CancellationToken cancellationToken) =>
+            Validate(request)
+                .MapT(_ => ApplyAddItemsRequest(request))
+                .Bind(v => v.ToEitherAsync());
+
+        private async Task<Unit> ApplyAddItemsRequest(AddItemsToCollection request)
+        {
+            if (await _mediaCollectionRepository.AddMediaItems(
+                request.CollectionId,
+                request.MovieIds.Append(request.ShowIds).ToList()))
+            {
+                // rebuild all playouts that use this collection
+                foreach (int playoutId in await _mediaCollectionRepository
+                    .PlayoutIdsUsingCollection(request.CollectionId))
+                {
+                    await _channel.WriteAsync(new BuildPlayout(playoutId, true));
+                }
+            }
+
+            return Unit.Default;
+        }
+
+        private async Task<Validation<BaseError, Unit>> Validate(AddItemsToCollection request) =>
+            (await CollectionMustExist(request), await ValidateMovies(request), await ValidateShows(request))
+            .Apply((_, _, _) => Unit.Default);
+
+        private Task<Validation<BaseError, Unit>> CollectionMustExist(AddItemsToCollection request) =>
+            _mediaCollectionRepository.GetCollectionWithItems(request.CollectionId)
+                .MapT(_ => Unit.Default)
+                .Map(v => v.ToValidation<BaseError>("Collection does not exist."));
+
+        private Task<Validation<BaseError, Unit>> ValidateMovies(AddItemsToCollection request) =>
+            _movieRepository.AllMoviesExist(request.MovieIds)
+                .Map(Optional)
+                .Filter(v => v == true)
+                .MapT(_ => Unit.Default)
+                .Map(v => v.ToValidation<BaseError>("Movie does not exist"));
+
+        private Task<Validation<BaseError, Unit>> ValidateShows(AddItemsToCollection request) =>
+            _televisionRepository.AllShowsExist(request.ShowIds)
+                .Map(Optional)
+                .Filter(v => v == true)
+                .MapT(_ => Unit.Default)
+                .Map(v => v.ToValidation<BaseError>("Show does not exist"));
+    }
+}

ErsatzTV.Application/Movies/Mapper.cs

@@ -15,7 +15,8 @@ namespace ErsatzTV.Application.Movies
                 metadata.Plot,
                 Artwork(metadata, ArtworkKind.Poster),
                 Artwork(metadata, ArtworkKind.FanArt),
-                metadata.Genres.Map(g => g.Name).ToList());
+                metadata.Genres.Map(g => g.Name).ToList(),
+                metadata.Tags.Map(t => t.Name).ToList());
         }
 
         private static string Artwork(Metadata metadata, ArtworkKind artworkKind) =>

ErsatzTV.Application/Movies/MovieViewModel.cs

@@ -8,5 +8,6 @@ namespace ErsatzTV.Application.Movies
         string Plot,
         string Poster,
         string FanArt,
-        List<string> Genres);
+        List<string> Genres,
+        List<string> Tags);
 }

ErsatzTV.Application/Television/Mapper.cs

@@ -15,7 +15,8 @@ namespace ErsatzTV.Application.Television
                 show.ShowMetadata.HeadOrNone().Map(m => m.Plot ?? string.Empty).IfNone(string.Empty),
                 show.ShowMetadata.HeadOrNone().Map(GetPoster).IfNone(string.Empty),
                 show.ShowMetadata.HeadOrNone().Map(GetFanArt).IfNone(string.Empty),
-                show.ShowMetadata.HeadOrNone().Map(m => m.Genres.Map(g => g.Name).ToList()).IfNone(new List<string>()));
+                show.ShowMetadata.HeadOrNone().Map(m => m.Genres.Map(g => g.Name).ToList()).IfNone(new List<string>()),
+                show.ShowMetadata.HeadOrNone().Map(m => m.Tags.Map(g => g.Name).ToList()).IfNone(new List<string>()));
 
         internal static TelevisionSeasonViewModel ProjectToViewModel(Season season) =>
             new(

ErsatzTV.Application/Television/TelevisionShowViewModel.cs

@@ -9,5 +9,6 @@ namespace ErsatzTV.Application.Television
         string Plot,
         string Poster,
         string FanArt,
-        List<string> Genres);
+        List<string> Genres,
+        List<string> Tags);
 }

ErsatzTV.Core.Tests/Fakes/FakeMediaCollectionRepository.cs

@@ -16,6 +16,8 @@ namespace ErsatzTV.Core.Tests.Fakes
         public FakeMediaCollectionRepository(Map<int, List<MediaItem>> data) => _data = data;
         public Task<Collection> Add(Collection collection) => throw new NotSupportedException();
         public Task<bool> AddMediaItem(int collectionId, int mediaItemId) => throw new NotSupportedException();
+        public Task<bool> AddMediaItems(int collectionId, List<int> mediaItemIds) => throw new NotSupportedException();
+
         public Task<Option<Collection>> Get(int id) => throw new NotSupportedException();
         public Task<Option<Collection>> GetCollectionWithItems(int id) => throw new NotSupportedException();
         public Task<Option<Collection>> GetCollectionWithItemsUntracked(int id) => throw new NotSupportedException();

ErsatzTV.Core.Tests/Fakes/FakeTelevisionRepository.cs

@@ -9,6 +9,8 @@ namespace ErsatzTV.Core.Tests.Fakes
 {
     public class FakeTelevisionRepository : ITelevisionRepository
     {
+        public Task<bool> AllShowsExist(List<int> showIds) => throw new NotSupportedException();
+
         public Task<bool> Update(Show show) => throw new NotSupportedException();
 
         public Task<bool> Update(Season season) => throw new NotSupportedException();

ErsatzTV.Core/Domain/Metadata/Metadata.cs

@@ -16,5 +16,6 @@ namespace ErsatzTV.Core.Domain
         public DateTime DateUpdated { get; set; }
         public List<Artwork> Artwork { get; set; }
         public List<Genre> Genres { get; set; }
+        public List<Tag> Tags { get; set; }
     }
 }

ErsatzTV.Core/Domain/Metadata/Tag.cs

@@ -0,0 +1,8 @@
+namespace ErsatzTV.Core.Domain
+{
+    public class Tag
+    {
+        public int Id { get; set; }
+        public string Name { get; set; }
+    }
+}

ErsatzTV.Core/Interfaces/Repositories/IMediaCollectionRepository.cs

@@ -9,6 +9,7 @@ namespace ErsatzTV.Core.Interfaces.Repositories
     {
         Task<Collection> Add(Collection collection);
         Task<bool> AddMediaItem(int collectionId, int mediaItemId);
+        Task<bool> AddMediaItems(int collectionId, List<int> mediaItemIds);
         Task<Option<Collection>> Get(int id);
         Task<Option<Collection>> GetCollectionWithItems(int id);
         Task<Option<Collection>> GetCollectionWithItemsUntracked(int id);

ErsatzTV.Core/Interfaces/Repositories/IMovieRepository.cs

@@ -7,6 +7,7 @@ namespace ErsatzTV.Core.Interfaces.Repositories
 {
     public interface IMovieRepository
     {
+        Task<bool> AllMoviesExist(List<int> movieIds);
         Task<Option<Movie>> GetMovie(int movieId);
         Task<Either<BaseError, Movie>> GetOrAdd(LibraryPath libraryPath, string path);
         Task<Either<BaseError, PlexMovie>> GetOrAdd(PlexLibrary library, PlexMovie item);

ErsatzTV.Core/Interfaces/Repositories/ISearchRepository.cs

@@ -8,5 +8,6 @@ namespace ErsatzTV.Core.Interfaces.Repositories
     {
         public Task<List<MediaItem>> SearchMediaItemsByTitle(string query);
         public Task<List<MediaItem>> SearchMediaItemsByGenre(string genre);
+        public Task<List<MediaItem>> SearchMediaItemsByTag(string tag);
     }
 }

ErsatzTV.Core/Interfaces/Repositories/ITelevisionRepository.cs

@@ -7,6 +7,7 @@ namespace ErsatzTV.Core.Interfaces.Repositories
 {
     public interface ITelevisionRepository
     {
+        Task<bool> AllShowsExist(List<int> showIds);
         Task<bool> Update(Show show);
         Task<bool> Update(Season season);
         Task<bool> Update(Episode episode);

ErsatzTV.Core/Metadata/LocalMetadataProvider.cs

@@ -146,6 +146,18 @@ namespace ErsatzTV.Core.Metadata
                     {
                         existing.Genres.Add(genre);
                     }
+
+                    foreach (Tag tag in existing.Tags.Filter(t => metadata.Tags.All(t2 => t2.Name != t.Name))
+                        .ToList())
+                    {
+                        existing.Tags.Remove(tag);
+                    }
+
+                    foreach (Tag tag in metadata.Tags.Filter(t => existing.Tags.All(t2 => t2.Name != t.Name))
+                        .ToList())
+                    {
+                        existing.Tags.Add(tag);
+                    }
                 },
                 () =>
                 {
@@ -188,6 +200,18 @@ namespace ErsatzTV.Core.Metadata
                     {
                         existing.Genres.Add(genre);
                     }
+
+                    foreach (Tag tag in existing.Tags.Filter(t => metadata.Tags.All(t2 => t2.Name != t.Name))
+                        .ToList())
+                    {
+                        existing.Tags.Remove(tag);
+                    }
+
+                    foreach (Tag tag in metadata.Tags.Filter(t => existing.Tags.All(t2 => t2.Name != t.Name))
+                        .ToList())
+                    {
+                        existing.Tags.Add(tag);
+                    }
                 },
                 () =>
                 {
@@ -250,7 +274,8 @@ namespace ErsatzTV.Core.Metadata
                         Tagline = nfo.Tagline,
                         Year = nfo.Year,
                         ReleaseDate = GetAired(nfo.Premiered) ?? new DateTime(nfo.Year, 1, 1),
-                        Genres = nfo.Genres.Map(g => new Genre { Name = g }).ToList()
+                        Genres = nfo.Genres.Map(g => new Genre { Name = g }).ToList(),
+                        Tags = nfo.Tags.Map(t => new Tag { Name = t }).ToList()
                     },
                     None);
             }
@@ -306,7 +331,8 @@ namespace ErsatzTV.Core.Metadata
                         Plot = nfo.Plot,
                         Outline = nfo.Outline,
                         Tagline = nfo.Tagline,
-                        Genres = nfo.Genres.Map(g => new Genre { Name = g }).ToList()
+                        Genres = nfo.Genres.Map(g => new Genre { Name = g }).ToList(),
+                        Tags = nfo.Tags.Map(t => new Tag { Name = t }).ToList()
                     },
                     None);
             }
@@ -358,6 +384,9 @@ namespace ErsatzTV.Core.Metadata
 
             [XmlElement("genre")]
             public List<string> Genres { get; set; }
+
+            [XmlElement("tag")]
+            public List<string> Tags { get; set; }
         }
 
         [XmlRoot("tvshow")]
@@ -383,6 +412,9 @@ namespace ErsatzTV.Core.Metadata
 
             [XmlElement("genre")]
             public List<string> Genres { get; set; }
+
+            [XmlElement("tag")]
+            public List<string> Tags { get; set; }
         }
 
         [XmlRoot("episodedetails")]

ErsatzTV.Infrastructure/Data/Configurations/Metadata/MovieMetadataConfiguration.cs

@@ -17,6 +17,10 @@ namespace ErsatzTV.Infrastructure.Data.Configurations
             builder.HasMany(mm => mm.Genres)
                 .WithOne()
                 .OnDelete(DeleteBehavior.Cascade);
+
+            builder.HasMany(mm => mm.Tags)
+                .WithOne()
+                .OnDelete(DeleteBehavior.Cascade);
         }
     }
 }

ErsatzTV.Infrastructure/Data/Configurations/Metadata/ShowMetadataConfiguration.cs

@@ -17,6 +17,10 @@ namespace ErsatzTV.Infrastructure.Data.Configurations
             builder.HasMany(mm => mm.Genres)
                 .WithOne()
                 .OnDelete(DeleteBehavior.Cascade);
+
+            builder.HasMany(mm => mm.Tags)
+                .WithOne()
+                .OnDelete(DeleteBehavior.Cascade);
         }
     }
 }

ErsatzTV.Infrastructure/Data/Repositories/MediaCollectionRepository.cs

@@ -62,6 +62,34 @@ namespace ErsatzTV.Infrastructure.Data.Repositories
             return modified;
         }
 
+        public async Task<bool> AddMediaItems(int collectionId, List<int> mediaItemIds)
+        {
+            var modified = false;
+
+            Option<Collection> maybeCollection = await _dbContext.Collections
+                .Include(c => c.MediaItems)
+                .OrderBy(c => c.Id)
+                .SingleOrDefaultAsync(c => c.Id == collectionId)
+                .Map(Optional);
+
+            await maybeCollection.IfSomeAsync(
+                async collection =>
+                {
+                    var toAdd = mediaItemIds.Filter(i => collection.MediaItems.All(i2 => i2.Id != i)).ToList();
+                    if (toAdd.Any())
+                    {
+                        List<MediaItem> items = await _dbContext.MediaItems
+                            .Filter(mi => toAdd.Contains(mi.Id))
+                            .ToListAsync();
+
+                        collection.MediaItems.AddRange(items);
+                        modified = await _dbContext.SaveChangesAsync() > 0;
+                    }
+                });
+
+            return modified;
+        }
+
         public Task<Option<Collection>> Get(int id) =>
             _dbContext.Collections
                 .OrderBy(c => c.Id)

ErsatzTV.Infrastructure/Data/Repositories/MovieRepository.cs

@@ -29,6 +29,12 @@ namespace ErsatzTV.Infrastructure.Data.Repositories
             _dbConnection = dbConnection;
         }
 
+        public Task<bool> AllMoviesExist(List<int> movieIds) =>
+            _dbConnection.QuerySingleAsync<int>(
+                    "SELECT COUNT(*) FROM Movie WHERE Id in @MovieIds",
+                    new { MovieIds = movieIds })
+                .Map(c => c == movieIds.Count);
+
         public async Task<Option<Movie>> GetMovie(int movieId)
         {
             await using TvContext dbContext = _dbContextFactory.CreateDbContext();
@@ -37,6 +43,8 @@ namespace ErsatzTV.Infrastructure.Data.Repositories
                 .ThenInclude(m => m.Artwork)
                 .Include(m => m.MovieMetadata)
                 .ThenInclude(m => m.Genres)
+                .Include(m => m.MovieMetadata)
+                .ThenInclude(m => m.Tags)
                 .OrderBy(m => m.Id)
                 .SingleOrDefaultAsync(m => m.Id == movieId)
                 .Map(Optional);
@@ -49,6 +57,8 @@ namespace ErsatzTV.Infrastructure.Data.Repositories
                 .ThenInclude(mm => mm.Artwork)
                 .Include(i => i.MovieMetadata)
                 .ThenInclude(mm => mm.Genres)
+                .Include(i => i.MovieMetadata)
+                .ThenInclude(mm => mm.Tags)
                 .Include(i => i.LibraryPath)
                 .Include(i => i.MediaVersions)
                 .ThenInclude(mv => mv.MediaFiles)

ErsatzTV.Infrastructure/Data/Repositories/SearchRepository.cs

@@ -72,5 +72,32 @@ namespace ErsatzTV.Infrastructure.Data.Repositories
                 .OfType<MediaItem>()
                 .ToListAsync();
         }
+
+        public async Task<List<MediaItem>> SearchMediaItemsByTag(string tag)
+        {
+            List<int> ids = await _dbConnection.QueryAsync<int>(
+                    @"SELECT M.Id FROM Movie M
+                    INNER JOIN MovieMetadata MM on M.Id = MM.MovieId
+                    INNER JOIN Tag T on MM.Id = T.MovieMetadataId
+                    WHERE T.Name LIKE @Query
+                    UNION
+                    SELECT S.Id FROM Show S
+                    INNER JOIN ShowMetadata SM on S.Id = SM.ShowId
+                    INNER JOIN Tag T2 on SM.Id = T2.ShowMetadataId
+                    WHERE T2.Name LIKE @Query
+                    GROUP BY SM.Title, SM.Year",
+                    new { Query = tag })
+                .Map(results => results.ToList());
+
+            await using TvContext context = _dbContextFactory.CreateDbContext();
+            return await context.MediaItems
+                .Filter(m => ids.Contains(m.Id))
+                .Include(m => (m as Movie).MovieMetadata)
+                .ThenInclude(mm => mm.Artwork)
+                .Include(m => (m as Show).ShowMetadata)
+                .ThenInclude(mm => mm.Artwork)
+                .OfType<MediaItem>()
+                .ToListAsync();
+        }
     }
 }

ErsatzTV.Infrastructure/Data/Repositories/TelevisionRepository.cs

@@ -24,6 +24,12 @@ namespace ErsatzTV.Infrastructure.Data.Repositories
             _dbConnection = dbConnection;
         }
 
+        public Task<bool> AllShowsExist(List<int> showIds) =>
+            _dbConnection.QuerySingleAsync<int>(
+                    "SELECT COUNT(*) FROM Show WHERE Id in @ShowIds",
+                    new { ShowIds = showIds })
+                .Map(c => c == showIds.Count);
+
         public async Task<bool> Update(Show show)
         {
             _dbContext.Shows.Update(show);
@@ -57,6 +63,8 @@ namespace ErsatzTV.Infrastructure.Data.Repositories
                 .ThenInclude(sm => sm.Artwork)
                 .Include(s => s.ShowMetadata)
                 .ThenInclude(sm => sm.Genres)
+                .Include(s => s.ShowMetadata)
+                .ThenInclude(sm => sm.Tags)
                 .OrderBy(s => s.Id)
                 .SingleOrDefaultAsync()
                 .Map(Optional);
@@ -175,6 +183,8 @@ namespace ErsatzTV.Infrastructure.Data.Repositories
                         .ThenInclude(sm => sm.Artwork)
                         .Include(s => s.ShowMetadata)
                         .ThenInclude(sm => sm.Genres)
+                        .Include(s => s.ShowMetadata)
+                        .ThenInclude(sm => sm.Tags)
                         .OrderBy(s => s.Id)
                         .SingleOrDefaultAsync(s => s.Id == id)
                         .Map(Optional);
@@ -188,6 +198,7 @@ namespace ErsatzTV.Infrastructure.Data.Repositories
             {
                 metadata.DateAdded = DateTime.UtcNow;
                 metadata.Genres ??= new List<Genre>();
+                metadata.Tags ??= new List<Tag>();
                 var show = new Show
                 {
                     LibraryPathId = libraryPathId,

ErsatzTV.Infrastructure/Migrations/20210311175744_Add_MetadataTags.cs

@@ -0,0 +1,75 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+namespace ErsatzTV.Infrastructure.Migrations
+{
+    public partial class Add_MetadataTags : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.CreateTable(
+                "Tag",
+                table => new
+                {
+                    Id = table.Column<int>("INTEGER", nullable: false)
+                        .Annotation("Sqlite:Autoincrement", true),
+                    Name = table.Column<string>("TEXT", nullable: true),
+                    EpisodeMetadataId = table.Column<int>("INTEGER", nullable: true),
+                    MovieMetadataId = table.Column<int>("INTEGER", nullable: true),
+                    SeasonMetadataId = table.Column<int>("INTEGER", nullable: true),
+                    ShowMetadataId = table.Column<int>("INTEGER", nullable: true)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_Tag", x => x.Id);
+                    table.ForeignKey(
+                        "FK_Tag_EpisodeMetadata_EpisodeMetadataId",
+                        x => x.EpisodeMetadataId,
+                        "EpisodeMetadata",
+                        "Id",
+                        onDelete: ReferentialAction.Restrict);
+                    table.ForeignKey(
+                        "FK_Tag_MovieMetadata_MovieMetadataId",
+                        x => x.MovieMetadataId,
+                        "MovieMetadata",
+                        "Id",
+                        onDelete: ReferentialAction.Cascade);
+                    table.ForeignKey(
+                        "FK_Tag_SeasonMetadata_SeasonMetadataId",
+                        x => x.SeasonMetadataId,
+                        "SeasonMetadata",
+                        "Id",
+                        onDelete: ReferentialAction.Restrict);
+                    table.ForeignKey(
+                        "FK_Tag_ShowMetadata_ShowMetadataId",
+                        x => x.ShowMetadataId,
+                        "ShowMetadata",
+                        "Id",
+                        onDelete: ReferentialAction.Cascade);
+                });
+
+            migrationBuilder.CreateIndex(
+                "IX_Tag_EpisodeMetadataId",
+                "Tag",
+                "EpisodeMetadataId");
+
+            migrationBuilder.CreateIndex(
+                "IX_Tag_MovieMetadataId",
+                "Tag",
+                "MovieMetadataId");
+
+            migrationBuilder.CreateIndex(
+                "IX_Tag_SeasonMetadataId",
+                "Tag",
+                "SeasonMetadataId");
+
+            migrationBuilder.CreateIndex(
+                "IX_Tag_ShowMetadataId",
+                "Tag",
+                "ShowMetadataId");
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder) =>
+            migrationBuilder.DropTable(
+                "Tag");
+    }
+}

ErsatzTV.Infrastructure/Migrations/20210311182247_Reset_MetadataDateUpdated_Tags.cs

@@ -0,0 +1,18 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+namespace ErsatzTV.Infrastructure.Migrations
+{
+    public partial class Reset_MetadataDateUpdated_Tags : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.Sql(@"UPDATE MovieMetadata SET DateUpdated = '0001-01-01 00:00:00'");
+            migrationBuilder.Sql(@"UPDATE ShowMetadata SET DateUpdated = '0001-01-01 00:00:00'");
+            migrationBuilder.Sql(@"UPDATE Library SET LastScan = '0001-01-01 00:00:00'");
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+        }
+    }
+}

ErsatzTV.Infrastructure/Migrations/TvContextModelSnapshot.cs

@@ -839,6 +839,42 @@ namespace ErsatzTV.Infrastructure.Migrations
                     b.ToTable("ShowMetadata");
                 });
 
+            modelBuilder.Entity(
+                "ErsatzTV.Core.Domain.Tag",
+                b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER");
+
+                    b.Property<int?>("EpisodeMetadataId")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<int?>("MovieMetadataId")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<string>("Name")
+                        .HasColumnType("TEXT");
+
+                    b.Property<int?>("SeasonMetadataId")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<int?>("ShowMetadataId")
+                        .HasColumnType("INTEGER");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("EpisodeMetadataId");
+
+                    b.HasIndex("MovieMetadataId");
+
+                    b.HasIndex("SeasonMetadataId");
+
+                    b.HasIndex("ShowMetadataId");
+
+                    b.ToTable("Tag");
+                });
+
             modelBuilder.Entity(
                 "ErsatzTV.Core.Domain.LocalLibrary",
                 b =>
@@ -1421,6 +1457,29 @@ namespace ErsatzTV.Infrastructure.Migrations
                     b.Navigation("Show");
                 });
 
+            modelBuilder.Entity(
+                "ErsatzTV.Core.Domain.Tag",
+                b =>
+                {
+                    b.HasOne("ErsatzTV.Core.Domain.EpisodeMetadata", null)
+                        .WithMany("Tags")
+                        .HasForeignKey("EpisodeMetadataId");
+
+                    b.HasOne("ErsatzTV.Core.Domain.MovieMetadata", null)
+                        .WithMany("Tags")
+                        .HasForeignKey("MovieMetadataId")
+                        .OnDelete(DeleteBehavior.Cascade);
+
+                    b.HasOne("ErsatzTV.Core.Domain.SeasonMetadata", null)
+                        .WithMany("Tags")
+                        .HasForeignKey("SeasonMetadataId");
+
+                    b.HasOne("ErsatzTV.Core.Domain.ShowMetadata", null)
+                        .WithMany("Tags")
+                        .HasForeignKey("ShowMetadataId")
+                        .OnDelete(DeleteBehavior.Cascade);
+                });
+
             modelBuilder.Entity(
                 "ErsatzTV.Core.Domain.LocalLibrary",
                 b =>
@@ -1609,6 +1668,8 @@ namespace ErsatzTV.Infrastructure.Migrations
                     b.Navigation("Artwork");
 
                     b.Navigation("Genres");
+
+                    b.Navigation("Tags");
                 });
 
             modelBuilder.Entity("ErsatzTV.Core.Domain.Library", b => { b.Navigation("Paths"); });
@@ -1628,6 +1689,8 @@ namespace ErsatzTV.Infrastructure.Migrations
                     b.Navigation("Artwork");
 
                     b.Navigation("Genres");
+
+                    b.Navigation("Tags");
                 });
 
             modelBuilder.Entity(
@@ -1655,6 +1718,8 @@ namespace ErsatzTV.Infrastructure.Migrations
                     b.Navigation("Artwork");
 
                     b.Navigation("Genres");
+
+                    b.Navigation("Tags");
                 });
 
             modelBuilder.Entity(
@@ -1664,6 +1729,8 @@ namespace ErsatzTV.Infrastructure.Migrations
                     b.Navigation("Artwork");
 
                     b.Navigation("Genres");
+
+                    b.Navigation("Tags");
                 });
 
             modelBuilder.Entity(

ErsatzTV/Pages/CollectionItems.razor

@@ -2,52 +2,114 @@
 @using ErsatzTV.Application.MediaCards
 @using ErsatzTV.Application.MediaCards.Queries
 @using ErsatzTV.Application.MediaCollections.Commands
+@inherits MultiSelectBase<CollectionItems>
 @inject NavigationManager NavigationManager
-@inject IMediator Mediator
-@inject ILogger<CollectionItems> Logger
-@inject ISnackbar Snackbar
-@inject IDialogService Dialog
 @inject ChannelWriter<IBackgroundServiceRequest> Channel
 
-<MudContainer MaxWidth="MaxWidth.ExtraLarge" Class="pt-8">
-    <div class="mb-6" style="display: flex; flex-direction: row;">
-        <MudText GutterBottom="true" Typo="Typo.h2">@_data.Name</MudText>
+<MudPaper Square="true" Style="display: flex; height: 64px; left: 240px; padding: 0; position: fixed; right: 0; z-index: 100;">
+    <div style="align-items: center; display: flex; flex-direction: row; margin-bottom: auto; margin-top: auto; width: 100%;" class="ml-6 mr-6">
+        @if (IsSelectMode())
+        {
+            <MudText Typo="Typo.h6" Color="Color.Primary">@SelectionLabel()</MudText>
+            <div style="margin-left: auto">
+                <MudButton Variant="Variant.Filled"
+                           Color="Color.Error"
+                           StartIcon="@Icons.Material.Filled.Remove"
+                           OnClick="@(_ => RemoveSelectionFromCollection(Id))">
+                    Remove From Collection
+                </MudButton>
+                <MudButton Class="ml-3"
+                           Variant="Variant.Filled"
+                           Color="Color.Secondary"
+                           StartIcon="@Icons.Material.Filled.Check"
+                           OnClick="@(_ => ClearSelection())">
+                    Clear Selection
+                </MudButton>
+            </div>
+        }
+        else
+        {
+            <div style="display: flex; flex-direction: row;">
+                <MudText Typo="Typo.h4">@_data.Name</MudText>
                 <MudIconButton Icon="@Icons.Material.Filled.Edit"
                                Link="@($"/media/collections/{Id}/edit")"
                                Style="margin-bottom: auto; margin-top: auto;"/>
             </div>
+            @if (_data.MovieCards.Any())
+            {
+                <MudLink Class="ml-4" Href="@(NavigationManager.Uri.Split("#").Head() + "#movies")">@_data.MovieCards.Count Movies</MudLink>
+            }
+            @if (_data.ShowCards.Any())
+            {
+                <MudLink Class="ml-4" Href="@(NavigationManager.Uri.Split("#").Head() + "#shows")">@_data.ShowCards.Count Shows</MudLink>
+            }
+            @if (_data.SeasonCards.Any())
+            {
+                <MudLink Class="ml-4" Href="@(NavigationManager.Uri.Split("#").Head() + "#seasons")">@_data.SeasonCards.Count Seasons</MudLink>
+            }
+            @if (_data.EpisodeCards.Any())
+            {
+                <MudLink Class="ml-4" Href="@(NavigationManager.Uri.Split("#").Head() + "#episodes")">@_data.EpisodeCards.Count Episodes</MudLink>
+            }
+        }
+    </div>
+</MudPaper>
+<MudContainer MaxWidth="MaxWidth.ExtraLarge" Class="pt-8" Style="margin-top: 64px">
 
     @if (_data.MovieCards.Any())
     {
-        <MudText GutterBottom="true" Typo="Typo.h4">Movies</MudText>
+        <MudText GutterBottom="true"
+                 Typo="Typo.h4"
+                 Style="scroll-margin-top: 160px"
+                 UserAttributes="@(new Dictionary<string, object> { { "id", "movies" } })">
+            Movies
+        </MudText>
 
         <MudContainer MaxWidth="MaxWidth.False" Class="media-card-grid">
             @foreach (MovieCardViewModel card in _data.MovieCards.OrderBy(m => m.SortTitle))
             {
                 <MediaCard Data="@card"
                            Link="@($"/media/movies/{card.MovieId}")"
-                           DeleteClicked="@RemoveMovieFromCollection"/>
+                           DeleteClicked="@RemoveMovieFromCollection"
+                           SelectColor="@Color.Error"
+                           SelectClicked="@(e => SelectClicked(card, e))"
+                           IsSelected="@IsSelected(card)"
+                           IsSelectMode="@IsSelectMode()"/>
             }
         </MudContainer>
     }
 
     @if (_data.ShowCards.Any())
     {
-        <MudText GutterBottom="true" Typo="Typo.h4">Television Shows</MudText>
+        <MudText GutterBottom="true"
+                 Typo="Typo.h4"
+                 Style="scroll-margin-top: 160px"
+                 UserAttributes="@(new Dictionary<string, object> { { "id", "shows" } })">
+            Television Shows
+        </MudText>
 
         <MudContainer MaxWidth="MaxWidth.False" Class="media-card-grid">
             @foreach (TelevisionShowCardViewModel card in _data.ShowCards.OrderBy(m => m.SortTitle))
             {
                 <MediaCard Data="@card"
                            Link="@($"/media/tv/shows/{card.TelevisionShowId}")"
-                           DeleteClicked="@RemoveShowFromCollection"/>
+                           DeleteClicked="@RemoveShowFromCollection"
+                           SelectColor="@Color.Error"
+                           SelectClicked="@(e => SelectClicked(card, e))"
+                           IsSelected="@IsSelected(card)"
+                           IsSelectMode="@IsSelectMode()"/>
             }
         </MudContainer>
     }
 
     @if (_data.SeasonCards.Any())
     {
-        <MudText GutterBottom="true" Typo="Typo.h4">Television Seasons</MudText>
+        <MudText GutterBottom="true"
+                 Typo="Typo.h4"
+                 Style="scroll-margin-top: 160px"
+                 UserAttributes="@(new Dictionary<string, object> { { "id", "seasons" } })">
+            Television Seasons
+        </MudText>
 
         <MudContainer MaxWidth="MaxWidth.False" Class="media-card-grid">
             @foreach (TelevisionSeasonCardViewModel card in _data.SeasonCards.OrderBy(m => m.SortTitle))
@@ -56,14 +118,23 @@
                            Link="@($"/media/tv/seasons/{card.TelevisionSeasonId}")"
                            Title="@card.ShowTitle"
                            Subtitle="@card.Title"
-                           DeleteClicked="@RemoveSeasonFromCollection"/>
+                           DeleteClicked="@RemoveSeasonFromCollection"
+                           SelectColor="@Color.Error"
+                           SelectClicked="@(e => SelectClicked(card, e))"
+                           IsSelected="@IsSelected(card)"
+                           IsSelectMode="@IsSelectMode()"/>
             }
         </MudContainer>
     }
 
     @if (_data.EpisodeCards.Any())
     {
-        <MudText GutterBottom="true" Typo="Typo.h4">Television Episodes</MudText>
+        <MudText GutterBottom="true"
+                 Typo="Typo.h4"
+                 Style="scroll-margin-top: 160px"
+                 UserAttributes="@(new Dictionary<string, object> { { "id", "episodes" } })">
+            Television Episodes
+        </MudText>
 
         <MudContainer MaxWidth="MaxWidth.False" Class="media-card-grid">
             @foreach (TelevisionEpisodeCardViewModel card in _data.EpisodeCards.OrderBy(e => e.Aired))
@@ -75,7 +146,11 @@
                            ContainerClass="media-card-episode-container mx-2"
                            CardClass="media-card-episode"
                            DeleteClicked="@(_ => RemoveEpisodeFromCollection(card))"
-                           ArtworkKind="@ArtworkKind.Thumbnail"/>
+                           ArtworkKind="@ArtworkKind.Thumbnail"
+                           SelectColor="@Color.Error"
+                           SelectClicked="@(e => SelectClicked(card, e))"
+                           IsSelected="@IsSelected(card)"
+                           IsSelectMode="@IsSelectMode()"/>
             }
         </MudContainer>
     }
@@ -90,7 +165,7 @@
 
     protected override async Task OnParametersSetAsync() => await RefreshData();
 
-    private async Task RefreshData()
+    protected override async Task RefreshData()
     {
         Either<BaseError, CollectionCardResultsViewModel> maybeResult =
             await Mediator.Send(new GetCollectionCards(Id));
@@ -100,6 +175,20 @@
             error => NavigationManager.NavigateTo("404"));
     }
 
+    private void SelectClicked(MediaCardViewModel card, MouseEventArgs e)
+    {
+        List<MediaCardViewModel> GetSortedItems()
+        {
+            return _data.MovieCards.OrderBy(m => m.SortTitle)
+                .Append<MediaCardViewModel>(_data.ShowCards.OrderBy(s => s.SortTitle))
+                .Append(_data.SeasonCards.OrderBy(s => s.SortTitle))
+                .Append(_data.EpisodeCards.OrderBy(ep => ep.Aired))
+                .ToList();
+        }
+
+        SelectClicked(GetSortedItems, card, e);
+    }
+
     private async Task RemoveMovieFromCollection(MediaCardViewModel vm)
     {
         if (vm is MovieCardViewModel movie)

ErsatzTV/Pages/FragmentNavigationBase.cs

@@ -0,0 +1,33 @@
+using System;
+using System.Threading.Tasks;
+using ErsatzTV.Extensions;
+using Microsoft.AspNetCore.Components;
+using Microsoft.AspNetCore.Components.Routing;
+using Microsoft.JSInterop;
+
+namespace ErsatzTV.Pages
+{
+    public class FragmentNavigationBase : ComponentBase, IDisposable
+    {
+        [Inject]
+        private NavigationManager NavManager { get; set; }
+
+        [Inject]
+        private IJSRuntime JsRuntime { get; set; }
+
+        public void Dispose() => NavManager.LocationChanged -= TryFragmentNavigation;
+
+        protected override void OnInitialized() => NavManager.LocationChanged += TryFragmentNavigation;
+
+        protected override async Task OnAfterRenderAsync(bool firstRender)
+        {
+            if (firstRender)
+            {
+                await NavManager.NavigateToFragmentAsync(JsRuntime);
+            }
+        }
+
+        private async void TryFragmentNavigation(object sender, LocationChangedEventArgs args) =>
+            await NavManager.NavigateToFragmentAsync(JsRuntime);
+    }
+}

ErsatzTV/Pages/Movie.razor

@@ -45,10 +45,21 @@
     </div>
     @if (_movie.Genres.Any())
     {
-        <div>
+        <MudText GutterBottom="true">Genres</MudText>
+        <div class="mb-2">
             @foreach (string genre in _movie.Genres.OrderBy(g => g))
             {
-                <MudFab Color="Color.Info" Size="Size.Small" Label="@genre" Class="mr-2" Link="@($"/search?query=genre%3a{genre}")"/>
+                <MudFab Color="Color.Info" Size="Size.Small" Label="@genre" Class="mr-2 mb-2" Link="@($"/search?query=genre%3a{genre}")"/>
+            }
+        </div>
+    }
+    @if (_movie.Tags.Any())
+    {
+        <MudText GutterBottom="true">Tags</MudText>
+        <div>
+            @foreach (string tag in _movie.Tags.OrderBy(t => t))
+            {
+                <MudFab Color="Color.Info" Size="Size.Small" Label="@tag" Class="mr-2 mb-2" Link="@($"/search?query=tag%3a{tag}")"/>
             }
         </div>
     }

ErsatzTV/Pages/MovieList.razor

@@ -5,15 +5,34 @@
 @using ErsatzTV.Application.MediaCollections
 @using ErsatzTV.Application.MediaCollections.Commands
 @using Unit = LanguageExt.Unit
-@inject ILogger<MovieList> Logger
-@inject ISnackbar Snackbar
-@inject IMediator Mediator
-@inject IDialogService Dialog
+@inherits MultiSelectBase<MovieList>
 @inject NavigationManager NavigationManager
 @inject ChannelWriter<IBackgroundServiceRequest> Channel
 
-<MudContainer MaxWidth="MaxWidth.ExtraLarge" Class="pt-8">
-    <MudContainer MaxWidth="MaxWidth.Small" Class="mb-6" Style="max-width: 300px">
+<MudPaper Square="true" Style="display: flex; height: 64px; left: 240px; padding: 0; position: fixed; right: 0; z-index: 100;">
+    <div style="display: flex; flex-direction: row; margin-bottom: auto; margin-top: auto; width: 100%" class="ml-6 mr-6">
+        @if (IsSelectMode())
+        {
+            <MudText Typo="Typo.h6" Color="Color.Primary">@SelectionLabel()</MudText>
+            <div style="margin-left: auto">
+                <MudButton Variant="Variant.Filled"
+                           Color="Color.Primary"
+                           StartIcon="@Icons.Material.Filled.Add"
+                           OnClick="@(_ => AddSelectionToCollection())">
+                    Add To Collection
+                </MudButton>
+                <MudButton Class="ml-3"
+                           Variant="Variant.Filled"
+                           Color="Color.Secondary"
+                           StartIcon="@Icons.Material.Filled.Check"
+                           OnClick="@(_ => ClearSelection())">
+                    Clear Selection
+                </MudButton>
+            </div>
+        }
+        else
+        {
+            <div style="margin-left: auto; margin-right: auto; max-width: 300px;">
                 <MudPaper Style="align-items: center; display: flex; justify-content: center;">
                     <MudIconButton Icon="@Icons.Material.Outlined.ChevronLeft"
                                    OnClick="@PrevPage"
@@ -27,14 +46,20 @@
                                    OnClick="@NextPage" Disabled="@(PageNumber * PageSize >= _data.Count)">
                     </MudIconButton>
                 </MudPaper>
-    </MudContainer>
-
+            </div>
+        }
+    </div>
+</MudPaper>
+<MudContainer MaxWidth="MaxWidth.ExtraLarge" Class="pt-8" Style="margin-top: 64px">
     <MudContainer MaxWidth="MaxWidth.False" Class="media-card-grid">
         @foreach (MovieCardViewModel card in _data.Cards.Where(m => !string.IsNullOrWhiteSpace(m.Title)).OrderBy(m => m.SortTitle))
         {
             <MediaCard Data="@card"
                        Link="@($"/media/movies/{card.MovieId}")"
-                       AddToCollectionClicked="@AddToCollection"/>
+                       AddToCollectionClicked="@AddToCollection"
+                       SelectClicked="@(e => SelectClicked(card, e))"
+                       IsSelected="@IsSelected(card)"
+                       IsSelectMode="@IsSelectMode()"/>
         }
     </MudContainer>
 </MudContainer>
@@ -57,13 +82,23 @@
         return RefreshData();
     }
 
-    private async Task RefreshData() =>
+    protected override async Task RefreshData() =>
         _data = await Mediator.Send(new GetMovieCards(PageNumber, PageSize));
 
     private void PrevPage() => NavigationManager.NavigateTo($"/media/movies/page/{PageNumber - 1}");
 
     private void NextPage() => NavigationManager.NavigateTo($"/media/movies/page/{PageNumber + 1}");
 
+    private void SelectClicked(MediaCardViewModel card, MouseEventArgs e)
+    {
+        List<MediaCardViewModel> GetSortedItems()
+        {
+            return _data.Cards.OrderBy(m => m.SortTitle).ToList<MediaCardViewModel>();
+        }
+
+        SelectClicked(GetSortedItems, card, e);
+    }
+
     private async Task AddToCollection(MediaCardViewModel card)
     {
         if (card is MovieCardViewModel movie)

ErsatzTV/Pages/MultiSelectBase.cs

@@ -0,0 +1,159 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using ErsatzTV.Application.MediaCards;
+using ErsatzTV.Application.MediaCollections;
+using ErsatzTV.Application.MediaCollections.Commands;
+using ErsatzTV.Core;
+using ErsatzTV.Shared;
+using LanguageExt;
+using LanguageExt.UnsafeValueAccess;
+using MediatR;
+using Microsoft.AspNetCore.Components;
+using Microsoft.AspNetCore.Components.Web;
+using Microsoft.Extensions.Logging;
+using MudBlazor;
+using static LanguageExt.Prelude;
+using Unit = LanguageExt.Unit;
+
+namespace ErsatzTV.Pages
+{
+    public class MultiSelectBase<T> : FragmentNavigationBase
+    {
+        private readonly System.Collections.Generic.HashSet<MediaCardViewModel> _selectedItems;
+        private Option<MediaCardViewModel> _recentlySelected;
+
+        public MultiSelectBase()
+        {
+            _recentlySelected = None;
+            _selectedItems = new System.Collections.Generic.HashSet<MediaCardViewModel>();
+        }
+
+        [Inject]
+        protected IDialogService Dialog { get; set; }
+
+        [Inject]
+        protected ISnackbar Snackbar { get; set; }
+
+        [Inject]
+        protected ILogger<T> Logger { get; set; }
+
+        [Inject]
+        protected IMediator Mediator { get; set; }
+
+        protected bool IsSelected(MediaCardViewModel card) =>
+            _selectedItems.Contains(card);
+
+        protected bool IsSelectMode() =>
+            _selectedItems.Any();
+
+        protected string SelectionLabel() =>
+            $"{_selectedItems.Count} {(_selectedItems.Count == 1 ? "Item" : "Items")} Selected";
+
+        protected void ClearSelection()
+        {
+            _selectedItems.Clear();
+            _recentlySelected = None;
+        }
+
+        protected virtual Task RefreshData() => Task.CompletedTask;
+
+        protected void SelectClicked(
+            Func<List<MediaCardViewModel>> getSortedItems,
+            MediaCardViewModel card,
+            MouseEventArgs e)
+        {
+            if (_selectedItems.Contains(card))
+            {
+                _selectedItems.Remove(card);
+            }
+            else
+            {
+                if (e.ShiftKey && _recentlySelected.IsSome)
+                {
+                    List<MediaCardViewModel> sorted = getSortedItems();
+
+                    int start = sorted.IndexOf(_recentlySelected.ValueUnsafe());
+                    int finish = sorted.IndexOf(card);
+                    if (start > finish)
+                    {
+                        int temp = start;
+                        start = finish;
+                        finish = temp;
+                    }
+
+                    for (int i = start; i < finish; i++)
+                    {
+                        _selectedItems.Add(sorted[i]);
+                    }
+                }
+
+                _recentlySelected = card;
+                _selectedItems.Add(card);
+            }
+        }
+
+        protected async Task AddSelectionToCollection()
+        {
+            var parameters = new DialogParameters
+                { { "EntityType", _selectedItems.Count.ToString() }, { "EntityName", "selected items" } };
+            var options = new DialogOptions { CloseButton = true, MaxWidth = MaxWidth.ExtraSmall };
+
+            IDialogReference dialog = Dialog.Show<AddToCollectionDialog>("Add To Collection", parameters, options);
+            DialogResult result = await dialog.Result;
+            if (!result.Cancelled && result.Data is MediaCollectionViewModel collection)
+            {
+                var request = new AddItemsToCollection(
+                    collection.Id,
+                    _selectedItems.OfType<MovieCardViewModel>().Map(m => m.MovieId).ToList(),
+                    _selectedItems.OfType<TelevisionShowCardViewModel>().Map(s => s.TelevisionShowId).ToList());
+
+                Either<BaseError, Unit> addResult = await Mediator.Send(request);
+                addResult.Match(
+                    Left: error =>
+                    {
+                        Snackbar.Add($"Unexpected error adding items to collection: {error.Value}");
+                        Logger.LogError("Unexpected error adding items to collection: {Error}", error.Value);
+                    },
+                    Right: _ =>
+                    {
+                        Snackbar.Add(
+                            $"Added {_selectedItems.Count} items to collection {collection.Name}",
+                            Severity.Success);
+                        ClearSelection();
+                    });
+            }
+        }
+
+        protected async Task RemoveSelectionFromCollection(int collectionId)
+        {
+            var parameters = new DialogParameters
+                { { "EntityType", _selectedItems.Count.ToString() }, { "EntityName", "selected items" } };
+            var options = new DialogOptions { CloseButton = true, MaxWidth = MaxWidth.ExtraSmall };
+
+            IDialogReference dialog = Dialog.Show<RemoveFromCollectionDialog>(
+                "Remove From Collection",
+                parameters,
+                options);
+            DialogResult result = await dialog.Result;
+            if (!result.Cancelled)
+            {
+                var itemIds = new List<int>();
+                itemIds.AddRange(_selectedItems.OfType<MovieCardViewModel>().Map(m => m.MovieId));
+                itemIds.AddRange(_selectedItems.OfType<TelevisionShowCardViewModel>().Map(s => s.TelevisionShowId));
+                itemIds.AddRange(_selectedItems.OfType<TelevisionSeasonCardViewModel>().Map(s => s.TelevisionSeasonId));
+                itemIds.AddRange(_selectedItems.OfType<TelevisionEpisodeCardViewModel>().Map(e => e.EpisodeId));
+
+                await Mediator.Send(
+                    new RemoveItemsFromCollection(collectionId)
+                    {
+                        MediaItemIds = itemIds
+                    });
+
+                await RefreshData();
+                ClearSelection();
+            }
+        }
+    }
+}

ErsatzTV/Pages/Search.razor

@@ -6,42 +6,80 @@
 @using Microsoft.AspNetCore.WebUtilities
 @using Microsoft.Extensions.Primitives
 @using Unit = LanguageExt.Unit
+@inherits MultiSelectBase<Search>
 @inject NavigationManager NavigationManager
-@inject IMediator Mediator
-@inject ILogger<Search> Logger
-@inject ISnackbar Snackbar
-@inject IDialogService Dialog
 @inject ChannelWriter<IBackgroundServiceRequest> Channel
 
-<MudContainer MaxWidth="MaxWidth.ExtraLarge" Class="pt-8">
-    <div class="mb-6" style="display: flex; flex-direction: row;">
-        <MudText GutterBottom="true" Typo="Typo.h4">Search Results: "@_query"</MudText>
+<MudPaper Square="true" Style="display: flex; height: 64px; left: 240px; padding: 0; position: fixed; right: 0; z-index: 100;">
+    <div style="display: flex; flex-direction: row; margin-bottom: auto; margin-top: auto; width: 100%" class="ml-6 mr-6">
+        @if (IsSelectMode())
+        {
+            <MudText Typo="Typo.h6" Color="Color.Primary">@SelectionLabel()</MudText>
+            <div style="margin-left: auto">
+                <MudButton Variant="Variant.Filled"
+                           Color="Color.Primary"
+                           StartIcon="@Icons.Material.Filled.Add"
+                           OnClick="@(_ => AddSelectionToCollection())">
+                    Add To Collection
+                </MudButton>
+                <MudButton Class="ml-3"
+                           Variant="Variant.Filled"
+                           Color="Color.Secondary"
+                           StartIcon="@Icons.Material.Filled.Check"
+                           OnClick="@(_ => ClearSelection())">
+                    Clear Selection
+                </MudButton>
             </div>
-
+        }
+        else
+        {
+            <MudText>@_query</MudText>
+            <MudLink Class="ml-4" Href="@(NavigationManager.Uri.Split("#").Head() + "#movies")">@_data.MovieCards.Count Movies</MudLink>
+            <MudLink Class="ml-4" Href="@(NavigationManager.Uri.Split("#").Head() + "#shows")">@_data.ShowCards.Count Shows</MudLink>
+        }
+    </div>
+</MudPaper>
+<MudContainer MaxWidth="MaxWidth.ExtraLarge" Style="margin-top: 96px">
     @if (_data?.MovieCards.Any() == true)
     {
-        <MudText GutterBottom="true" Typo="Typo.h4">Movies</MudText>
+        <MudText GutterBottom="true"
+                 Typo="Typo.h4"
+                 Style="scroll-margin-top: 160px"
+                 UserAttributes="@(new Dictionary<string, object> { { "id", "movies" } })">
+            Movies
+        </MudText>
 
         <MudContainer MaxWidth="MaxWidth.False" Class="media-card-grid">
             @foreach (MovieCardViewModel card in _data.MovieCards.OrderBy(m => m.SortTitle))
             {
                 <MediaCard Data="@card"
                            Link="@($"/media/movies/{card.MovieId}")"
-                           AddToCollectionClicked="@AddToCollection"/>
+                           AddToCollectionClicked="@AddToCollection"
+                           SelectClicked="@(e => SelectClicked(card, e))"
+                           IsSelected="@IsSelected(card)"
+                           IsSelectMode="@IsSelectMode()"/>
             }
         </MudContainer>
     }
 
     @if (_data?.ShowCards.Any() == true)
     {
-        <MudText GutterBottom="true" Typo="Typo.h4">Television Shows</MudText>
+        <MudText GutterBottom="true"
+                 Typo="Typo.h4"
+                 Style="scroll-margin-top: 160px"
+                 UserAttributes="@(new Dictionary<string, object> { { "id", "shows" } })">
+            Shows
+        </MudText>
 
         <MudContainer MaxWidth="MaxWidth.False" Class="media-card-grid">
             @foreach (TelevisionShowCardViewModel card in _data.ShowCards.OrderBy(s => s.SortTitle))
             {
                 <MediaCard Data="@card"
                            Link="@($"/media/tv/shows/{card.TelevisionShowId}")"
-                           AddToCollectionClicked="@AddToCollection"/>
+                           AddToCollectionClicked="@AddToCollection"
+                           SelectClicked="@(e => SelectClicked(card, e))"
+                           IsSelected="@IsSelected(card)"
+                           IsSelectMode="@IsSelectMode()"/>
             }
         </MudContainer>
     }
@@ -63,6 +101,18 @@
         }
     }
 
+    private void SelectClicked(MediaCardViewModel card, MouseEventArgs e)
+    {
+        List<MediaCardViewModel> GetSortedItems()
+        {
+            return _data.MovieCards.OrderBy(m => m.SortTitle)
+                .Append<MediaCardViewModel>(_data.ShowCards.OrderBy(s => s.SortTitle))
+                .ToList();
+        }
+
+        SelectClicked(GetSortedItems, card, e);
+    }
+
     private async Task AddToCollection(MediaCardViewModel card)
     {
         if (card is MovieCardViewModel movie)

ErsatzTV/Pages/TelevisionSeasonList.razor

@@ -60,10 +60,21 @@
     </div>
     @if (_show.Genres.Any())
     {
-        <div>
+        <MudText GutterBottom="true">Genres</MudText>
+        <div class="mb-2">
             @foreach (string genre in _show.Genres.OrderBy(g => g))
             {
-                <MudFab Color="Color.Info" Size="Size.Small" Label="@genre" Class="mr-2" Link="@($"/search?query=genre%3a{genre}")"/>
+                <MudFab Color="Color.Info" Size="Size.Small" Label="@genre" Class="mr-2 mb-2" Link="@($"/search?query=genre%3a{genre}")"/>
+            }
+        </div>
+    }
+    @if (_show.Tags.Any())
+    {
+        <MudText GutterBottom="true">Tags</MudText>
+        <div>
+            @foreach (string tag in _show.Tags.OrderBy(t => t))
+            {
+                <MudFab Color="Color.Info" Size="Size.Small" Label="@tag" Class="mr-2 mb-2" Link="@($"/search?query=tag%3a{tag}")"/>
             }
         </div>
     }

ErsatzTV/Pages/TelevisionShowList.razor

@@ -1,63 +1,102 @@
 @page "/media/tv/shows"
+@page "/media/tv/shows/page/{PageNumber:int}"
 @using ErsatzTV.Application.MediaCards
 @using ErsatzTV.Application.MediaCards.Queries
 @using ErsatzTV.Application.MediaCollections
 @using ErsatzTV.Application.MediaCollections.Commands
 @using Unit = LanguageExt.Unit
-@inject ILogger<TelevisionShowList> Logger
-@inject ISnackbar Snackbar
-@inject IMediator Mediator
-@inject IDialogService Dialog
+@inherits MultiSelectBase<TelevisionShowList>
+@inject NavigationManager NavigationManager
 @inject ChannelWriter<IBackgroundServiceRequest> Channel
 
-<MudContainer MaxWidth="MaxWidth.ExtraLarge" Class="pt-8">
-    <MudContainer MaxWidth="MaxWidth.Small" Class="mb-6" Style="max-width: 300px">
+<MudPaper Square="true" Style="display: flex; height: 64px; left: 240px; padding: 0; position: fixed; right: 0; z-index: 100;">
+    <div style="display: flex; flex-direction: row; margin-bottom: auto; margin-top: auto; width: 100%" class="ml-6 mr-6">
+        @if (IsSelectMode())
+        {
+            <MudText Typo="Typo.h6" Color="Color.Primary">@SelectionLabel()</MudText>
+            <div style="margin-left: auto">
+                <MudButton Variant="Variant.Filled"
+                           Color="Color.Primary"
+                           StartIcon="@Icons.Material.Filled.Add"
+                           OnClick="@(_ => AddSelectionToCollection())">
+                    Add To Collection
+                </MudButton>
+                <MudButton Class="ml-3"
+                           Variant="Variant.Filled"
+                           Color="Color.Secondary"
+                           StartIcon="@Icons.Material.Filled.Check"
+                           OnClick="@(_ => ClearSelection())">
+                    Clear Selection
+                </MudButton>
+            </div>
+        }
+        else
+        {
+            <div style="margin-left: auto; margin-right: auto; max-width: 300px;">
                 <MudPaper Style="align-items: center; display: flex; justify-content: center;">
                     <MudIconButton Icon="@Icons.Material.Outlined.ChevronLeft"
-                           OnClick="@(() => PrevPage())"
-                           Disabled="@(_pageNumber <= 1)">
+                                   OnClick="@PrevPage"
+                                   Disabled="@(PageNumber <= 1)">
                     </MudIconButton>
                     <MudText Style="flex-grow: 1"
                              Align="Align.Center">
-                @Math.Min((_pageNumber - 1) * _pageSize + 1, _data.Count)-@Math.Min(_data.Count, _pageNumber * _pageSize) of @_data.Count
+                        @Math.Min((PageNumber - 1) * PageSize + 1, _data.Count)-@Math.Min(_data.Count, PageNumber * PageSize) of @_data.Count
                     </MudText>
                     <MudIconButton Icon="@Icons.Material.Outlined.ChevronRight"
-                           OnClick="@(() => NextPage())" Disabled="@(_pageNumber * _pageSize >= _data.Count)">
+                                   OnClick="@NextPage" Disabled="@(PageNumber * PageSize >= _data.Count)">
                     </MudIconButton>
                 </MudPaper>
-    </MudContainer>
-
+            </div>
+        }
+    </div>
+</MudPaper>
+<MudContainer MaxWidth="MaxWidth.ExtraLarge" Class="pt-8" Style="margin-top: 64px">
     <MudContainer MaxWidth="MaxWidth.False" Class="media-card-grid">
         @foreach (TelevisionShowCardViewModel card in _data.Cards.OrderBy(s => s.SortTitle))
         {
             <MediaCard Data="@card"
                        Link="@($"/media/tv/shows/{card.TelevisionShowId}")"
-                       AddToCollectionClicked="@AddToCollection"/>
+                       AddToCollectionClicked="@AddToCollection"
+                       SelectClicked="@(e => SelectClicked(card, e))"
+                       IsSelected="@IsSelected(card)"
+                       IsSelectMode="@IsSelectMode()"/>
         }
     </MudContainer>
 </MudContainer>
 
 @code {
-    private int _pageSize => 100;
-    private int _pageNumber = 1;
+    private static int PageSize => 100;
+
+    [Parameter]
+    public int PageNumber { get; set; }
 
     private TelevisionShowCardResultsViewModel _data;
 
-    protected override Task OnParametersSetAsync() => RefreshData();
-
-    private async Task RefreshData() =>
-        _data = await Mediator.Send(new GetTelevisionShowCards(_pageNumber, _pageSize));
-
-    private async Task PrevPage()
+    protected override Task OnParametersSetAsync()
     {
-        _pageNumber -= 1;
-        await RefreshData();
+        if (PageNumber == 0)
+        {
+            PageNumber = 1;
         }
 
-    private async Task NextPage()
+        return RefreshData();
+    }
+
+    protected override async Task RefreshData() =>
+        _data = await Mediator.Send(new GetTelevisionShowCards(PageNumber, PageSize));
+
+    private void PrevPage() => NavigationManager.NavigateTo($"/media/tv/shows/page/{PageNumber - 1}");
+
+    private void NextPage() => NavigationManager.NavigateTo($"/media/tv/shows/page/{PageNumber + 1}");
+
+    private void SelectClicked(MediaCardViewModel card, MouseEventArgs e)
     {
-        _pageNumber += 1;
-        await RefreshData();
+        List<MediaCardViewModel> GetSortedItems()
+        {
+            return _data.Cards.OrderBy(m => m.SortTitle).ToList<MediaCardViewModel>();
+        }
+
+        SelectClicked(GetSortedItems, card, e);
     }
 
     private async Task AddToCollection(MediaCardViewModel card)

ErsatzTV/Shared/MainLayout.razor

@@ -73,6 +73,7 @@
         {
             ActionDefault = "rgba(255,255,255, 0.80)",
             Primary = "#009000",
+            Secondary = "#009090",
             AppbarBackground = "#121212",
             Background = "#272727",
             DrawerBackground = "#1f1f1f",

ErsatzTV/Shared/MediaCard.razor

@@ -5,7 +5,8 @@
 <div class="@((ContainerClass ?? "media-card-container mr-6") + " pb-3")">
     @if (!string.IsNullOrWhiteSpace(Link))
     {
-        <div style="position: relative">
+        <div class="@(IsSelected ? DeleteClicked.HasDelegate ? "media-card-selected-delete" : "media-card-selected" : "")"
+             style="border-radius: 4px; position: relative;">
             <MudPaper Class="@($"media-card {CardClass}")" Style="@ArtworkForItem()">
                 @if (string.IsNullOrWhiteSpace(Data.Poster))
                 {
@@ -14,19 +15,36 @@
                     </MudText>
                 }
             </MudPaper>
+            @if (IsSelected)
+            {
+                <div style="display: flex; height: 48px; left: 0; position: absolute; top: 0; width: 48px;">
+                    <MudIcon Color="@SelectColor"
+                             Icon="@Icons.Material.Filled.CheckBox"
+                             Style="margin: auto"/>
+                </div>
+            }
             <div class="media-card-overlay" style="">
-                <MudButton Link="@Link" Style="height: 100%; width: 100%">
+                <MudButton Link="@(IsSelectMode ? null : Link)"
+                           Style="height: 100%; width: 100%"
+                           OnClick="@(e => IsSelectMode ? SelectClicked.InvokeAsync(e) : Task.CompletedTask)">
                 </MudButton>
-                @if (AddToCollectionClicked.HasDelegate)
+                @if (SelectClicked.HasDelegate)
+                {
+                    <MudIconButton Color="@SelectColor"
+                                   Icon="@(IsSelected ? Icons.Material.Filled.CheckBox : Icons.Material.Filled.CheckBoxOutlineBlank)"
+                                   Style="left: 0; position: absolute; top: 0;"
+                                   OnClick="@(e => SelectClicked.InvokeAsync(e))"/>
+                }
+                @if (AddToCollectionClicked.HasDelegate && !IsSelectMode)
                 {
                     <MudIconButton Color="Color.Tertiary"
                                    Icon="@Icons.Material.Filled.PlaylistAdd"
                                    Style="bottom: 0; left: 0; position: absolute;"
                                    OnClick="@(() => AddToCollectionClicked.InvokeAsync(Data))"/>
                 }
-                @if (DeleteClicked.HasDelegate)
+                @if (DeleteClicked.HasDelegate && !IsSelectMode)
                 {
-                    <MudIconButton Color="Color.Tertiary"
+                    <MudIconButton Color="Color.Error"
                                    Icon="@Icons.Material.Filled.Delete"
                                    Style="bottom: 0; position: absolute; right: 0;"
                                    OnClick="@(() => DeleteClicked.InvokeAsync(Data))"/>
@@ -88,6 +106,18 @@
     [Parameter]
     public EventCallback<MediaCardViewModel> AddToCollectionClicked { get; set; }
 
+    [Parameter]
+    public EventCallback<MouseEventArgs> SelectClicked { get; set; }
+
+    [Parameter]
+    public bool IsSelectMode { get; set; }
+
+    [Parameter]
+    public bool IsSelected { get; set; }
+
+    [Parameter]
+    public Color SelectColor { get; set; } = Color.Tertiary;
+
     private string GetPlaceholder(string sortTitle)
     {
         if (Placeholder != null)

ErsatzTV/wwwroot/css/site.css

@@ -18,6 +18,10 @@
     width: 152px;
 }
 
+.media-card-selected { box-shadow: 0 0 0 3px #00c000, 0 0 4px rgba(0, 0, 0, 0.3); }
+
+.media-card-selected-delete { box-shadow: 0 0 0 3px #f44336, 0 0 4px rgba(0, 0, 0, 0.3); }
+
 .media-card-episode { width: 392px; }
 
 .media-card:hover { /*filter: brightness(75%);*/ }