using HackerNet.Application;

namespace HackerNet.Infrastructure.Repositories.Memory;

public class MemoryReadStore : IReadStore
{
  private readonly MemoryLinkRepository _linkRepository;
  private readonly MemoryCommentRepository _commentRepository;

  public MemoryReadStore(MemoryLinkRepository linkRepository, MemoryCommentRepository commentRepository)
  {
    _linkRepository = linkRepository;
    _commentRepository = commentRepository;
  }

  public LinkComment[] GetLinkComments(Guid linkId)
   => _commentRepository.Comments
      .OrderByDescending(c => c.CreatedAt)
      .Select(c => new LinkComment
      {
        Content = c.Content
      }).ToArray();

  public LinkHomePage GetLinkDetail(Guid id)
    => GetLinks(id).Single();

  public LinkHomePage[] GetPublishedLinks()
  {
    // return (from l in _links
    //         orderby l.CreatedAt descending
    //         select new LinkHomePage
    //         {
    //           Id = l.Id,
    //           Url = l.Url,
    //           Description = l.Description,
    //           CommentsCount = 0,
    //         }).ToArray();

    return GetLinks().ToArray();
  }

  private IEnumerable<LinkHomePage> GetLinks(Guid? id = null)
  {
    return _linkRepository.Links
      .Where(l => !id.HasValue || l.Id == id)
      .OrderByDescending(l => l.CreatedAt)
      .Select(l => new LinkHomePage
      {
        Id = l.Id,
        Url = l.Url,
        Description = l.Description,
        CommentsCount = _commentRepository.Comments
          .Count(c => c.LinkId == l.Id),
      });
  }
}