ersatztv/ErsatzTV.Application/MediaCollections/Queries/GetPagedTraktListsHandler.cs

using ErsatzTV.Core.Domain;
using ErsatzTV.Infrastructure.Data;
using Microsoft.EntityFrameworkCore;
using static ErsatzTV.Application.MediaCollections.Mapper;

namespace ErsatzTV.Application.MediaCollections;

public class GetPagedTraktListsHandler(IDbContextFactory<TvContext> dbContextFactory)
    : IRequestHandler<GetPagedTraktLists, PagedTraktListsViewModel>
{
    public async Task<PagedTraktListsViewModel> Handle(
        GetPagedTraktLists request,
        CancellationToken cancellationToken)
    {
        await using TvContext dbContext = await dbContextFactory.CreateDbContextAsync(cancellationToken);
        // no filter today, but count and page are still derived from ONE query so that adding one
        // cannot leave the count behind (api.paged-count-matches-page-query)
        IQueryable<TraktList> query = dbContext.TraktLists.AsNoTracking();

        int count = await query.CountAsync(cancellationToken);

        List<TraktListViewModel> page = await query
            .OrderBy(l => l.Name)
            .Skip(request.PageNum * request.PageSize)
            .Take(request.PageSize)
            .Include(l => l.Items)
            .ToListAsync(cancellationToken)
            .Map(list => list.Map(ProjectToViewModel).ToList());

        return new PagedTraktListsViewModel(count, page);
    }
}