search overhaul (#87)

* add letter bar with no links

* use lucene for search, add paged search results

* add search index version

* index library_name; rebuild index when folder is missing

* maintain index as local movies change

* fix tests

* maintain index as local shows change

* maintain index as plex movies change

* maintain index as plex shows change

* code cleanup

* add duplicate filter to search

* add links to letter bar

* code cleanup

ErsatzTV.Application/Search/Queries/QuerySearchIndex.cs

@@ -0,0 +1,7 @@
+using ErsatzTV.Core.Search;
+using MediatR;
+
+namespace ErsatzTV.Application.Search.Queries
+{
+    public record QuerySearchIndex(string Query) : IRequest<SearchResult>;
+}

ErsatzTV.Application/Search/Queries/QuerySearchIndexHandler.cs

@@ -0,0 +1,18 @@
+using System.Threading;
+using System.Threading.Tasks;
+using ErsatzTV.Core.Interfaces.Search;
+using ErsatzTV.Core.Search;
+using MediatR;
+
+namespace ErsatzTV.Application.Search.Queries
+{
+    public class QuerySearchIndexHandler : IRequestHandler<QuerySearchIndex, SearchResult>
+    {
+        private readonly ISearchIndex _searchIndex;
+
+        public QuerySearchIndexHandler(ISearchIndex searchIndex) => _searchIndex = searchIndex;
+
+        public Task<SearchResult> Handle(QuerySearchIndex request, CancellationToken cancellationToken) =>
+            _searchIndex.Search(request.Query, 0, 100);
+    }
+}

ErsatzTV.Application/Search/Queries/QuerySearchIndexMovies.cs

@@ -0,0 +1,8 @@
+using ErsatzTV.Application.MediaCards;
+using MediatR;
+
+namespace ErsatzTV.Application.Search.Queries
+{
+    public record QuerySearchIndexMovies
+        (string Query, int PageNumber, int PageSize) : IRequest<MovieCardResultsViewModel>;
+}

ErsatzTV.Application/Search/Queries/QuerySearchIndexMoviesHandler.cs

@@ -0,0 +1,42 @@
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+using ErsatzTV.Application.MediaCards;
+using ErsatzTV.Core.Interfaces.Repositories;
+using ErsatzTV.Core.Interfaces.Search;
+using ErsatzTV.Core.Search;
+using LanguageExt;
+using MediatR;
+using static ErsatzTV.Application.MediaCards.Mapper;
+
+namespace ErsatzTV.Application.Search.Queries
+{
+    public class QuerySearchIndexMoviesHandler : IRequestHandler<QuerySearchIndexMovies, MovieCardResultsViewModel>
+    {
+        private readonly IMovieRepository _movieRepository;
+        private readonly ISearchIndex _searchIndex;
+
+        public QuerySearchIndexMoviesHandler(ISearchIndex searchIndex, IMovieRepository movieRepository)
+        {
+            _searchIndex = searchIndex;
+            _movieRepository = movieRepository;
+        }
+
+        public async Task<MovieCardResultsViewModel> Handle(
+            QuerySearchIndexMovies request,
+            CancellationToken cancellationToken)
+        {
+            SearchResult searchResult = await _searchIndex.Search(
+                request.Query,
+                (request.PageNumber - 1) * request.PageSize,
+                request.PageSize);
+
+            List<MovieCardViewModel> items = await _movieRepository
+                .GetMoviesForCards(searchResult.Items.Map(i => i.Id).ToList())
+                .Map(list => list.Map(ProjectToViewModel).ToList());
+
+            return new MovieCardResultsViewModel(searchResult.TotalCount, items, searchResult.PageMap);
+        }
+    }
+}

ErsatzTV.Application/Search/Queries/QuerySearchIndexShows.cs

@@ -0,0 +1,8 @@
+using ErsatzTV.Application.MediaCards;
+using MediatR;
+
+namespace ErsatzTV.Application.Search.Queries
+{
+    public record QuerySearchIndexShows
+        (string Query, int PageNumber, int PageSize) : IRequest<TelevisionShowCardResultsViewModel>;
+}

ErsatzTV.Application/Search/Queries/QuerySearchIndexShowsHandler.cs

@@ -0,0 +1,43 @@
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+using ErsatzTV.Application.MediaCards;
+using ErsatzTV.Core.Interfaces.Repositories;
+using ErsatzTV.Core.Interfaces.Search;
+using ErsatzTV.Core.Search;
+using LanguageExt;
+using MediatR;
+using static ErsatzTV.Application.MediaCards.Mapper;
+
+namespace ErsatzTV.Application.Search.Queries
+{
+    public class
+        QuerySearchIndexShowsHandler : IRequestHandler<QuerySearchIndexShows, TelevisionShowCardResultsViewModel>
+    {
+        private readonly ISearchIndex _searchIndex;
+        private readonly ITelevisionRepository _televisionRepository;
+
+        public QuerySearchIndexShowsHandler(ISearchIndex searchIndex, ITelevisionRepository televisionRepository)
+        {
+            _searchIndex = searchIndex;
+            _televisionRepository = televisionRepository;
+        }
+
+        public async Task<TelevisionShowCardResultsViewModel> Handle(
+            QuerySearchIndexShows request,
+            CancellationToken cancellationToken)
+        {
+            SearchResult searchResult = await _searchIndex.Search(
+                request.Query,
+                (request.PageNumber - 1) * request.PageSize,
+                request.PageSize);
+
+            List<TelevisionShowCardViewModel> items = await _televisionRepository
+                .GetShowsForCards(searchResult.Items.Map(i => i.Id).ToList())
+                .Map(list => list.Map(ProjectToViewModel).ToList());
+
+            return new TelevisionShowCardResultsViewModel(searchResult.TotalCount, items, searchResult.PageMap);
+        }
+    }
+}