using System.Threading;
using System.Linq;
using System.Threading.Tasks;
using MediatR;

namespace HN.Application
{
  public sealed class ListLinksQueryHandler : IRequestHandler<ListLinksQuery, LinkDTO[]>
  {
    private readonly IDbContext _context;

    public ListLinksQueryHandler(IDbContext context)
    {
      _context = context;
    }

    public Task<LinkDTO[]> Handle(ListLinksQuery request, CancellationToken cancellationToken)
    {
      var links = from link in _context.Links
                  select new LinkDTO
                  {
                    Id = link.Id,
                    Url = link.Url,
                    CreatedAt = link.CreatedAt
                  };

      return Task.FromResult(links.ToArray());
    }
  }
}