ErsatzTV/ErsatzTV.Application/Search/Queries/QuerySearchIndexArtistsHandler.cs

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
        QuerySearchIndexArtistsHandler : IRequestHandler<QuerySearchIndexArtists, ArtistCardResultsViewModel
        >
    {
        private readonly IArtistRepository _artistRepository;
        private readonly ISearchIndex _searchIndex;

        public QuerySearchIndexArtistsHandler(ISearchIndex searchIndex, IArtistRepository artistRepository)
        {
            _searchIndex = searchIndex;
            _artistRepository = artistRepository;
        }

        public async Task<ArtistCardResultsViewModel> Handle(
            QuerySearchIndexArtists request,
            CancellationToken cancellationToken)
        {
            SearchResult searchResult = await _searchIndex.Search(
                request.Query,
                (request.PageNumber - 1) * request.PageSize,
                request.PageSize);

            List<ArtistCardViewModel> items = await _artistRepository
                .GetArtistsForCards(searchResult.Items.Map(i => i.Id).ToList())
                .Map(list => list.Map(ProjectToViewModel).ToList());

            return new ArtistCardResultsViewModel(searchResult.TotalCount, items, searchResult.PageMap);
        }
    }
}