hackernet/HackerNet.Application/LinkService.cs

using System.ComponentModel.DataAnnotations;
using HackerNet.Domain;

namespace HackerNet.Application;
public class LinkService
{
  private readonly ILinkRepository _repository;
  private readonly ICommentRepository _commentRepository;
  private readonly IReadStore _readStore;

  public LinkService(
    ILinkRepository repository,
    ICommentRepository commentRepository,
    IReadStore readStore)
  {
    _repository = repository;
    _commentRepository = commentRepository;
    _readStore = readStore;
  }

  public Guid PublishLink(PublishLinkCommand cmd)
  {
    var link = new Link(cmd.Url, cmd.Description);

    _repository.Add(link);

    return link.Id;
  }

  public Guid PublishComment(PublishCommentCommand cmd)
  {
    var comment = new Comment(cmd.LinkId, cmd.Content);

    _commentRepository.Add(comment);

    return comment.Id;
  }

  public LinkHomePage[] GetPublishedLinks()
   => _readStore.GetPublishedLinks();

  public LinkHomePage GetLinkDetail(Guid id)
    => _readStore.GetLinkDetail(id);

  public LinkComment[] GetLinkComments(Guid linkId)
   => _readStore.GetLinkComments(linkId);
}

public interface IReadStore
{
  LinkHomePage[] GetPublishedLinks();
  LinkHomePage GetLinkDetail(Guid id);
  LinkComment[] GetLinkComments(Guid linkId);
}

public class LinkHomePage
{
  public Guid Id { get; set; }
  public string Url { get; set; }
  public string Description { get; set; }
  public int CommentsCount { get; set; }
}

public class LinkComment
{
  public string Content { get; set; }
}

public class PublishLinkCommand
{
  [Required(ErrorMessage = "L'url est requise")]
  [Display(Name = "Url du site")]
  [Url]
  public string Url { get; set; }

  [Required(ErrorMessage = "La description est obligatoire")]
  public string Description { get; set; }
}

public class PublishCommentCommand
{
  public Guid LinkId { get; set; }

  [Required]
  public string Content { get; set; }
}