Ajout des commentaires dans Domain/Application/Infrastructure

Application/CommentDTO.cs

@@ -0,0 +1,12 @@
+using System;
+
+namespace Application
+{
+  public class CommentDTO
+  {
+    public Guid Id { get; set; }
+    public string Content { get; set; }
+    public int UpvotesCount { get; set; }
+    public int DownvotesCount { get; set; }
+  }
+}

Application/CommentService.cs

@@ -0,0 +1,43 @@
+using System;
+using System.Linq;
+using Domain;
+
+namespace Application
+{
+  public class CommentService
+  {
+    private readonly ILinkRepository _linkRepository;
+    private readonly ICommentRepository _commentRepository;
+    private readonly IData _data;
+
+    public CommentService(ILinkRepository linkRepository, ICommentRepository commentRepository, IData data)
+    {
+      _linkRepository = linkRepository;
+      _commentRepository = commentRepository;
+      _data = data;
+    }
+
+    public void PublishComment(PublishCommentCommand cmd)
+    {
+      var link = _linkRepository.GetById(cmd.LinkId);
+      var comment = link.AddComment(cmd.Content);
+
+      _commentRepository.Add(comment);
+    }
+
+    public CommentDTO[] GetAllLinkComments(Guid linkId)
+    {
+      return _data.Comments
+        .OrderByDescending(comment => comment.CreatedAt)
+        .Where(comment => comment.LinkId == linkId)
+        .Select(comment => new CommentDTO
+        {
+          Id = comment.Id,
+          Content = comment.Content,
+          UpvotesCount = 0,
+          DownvotesCount = 0,
+        })
+        .ToArray();
+    }
+  }
+}

Application/IData.cs

@@ -9,5 +9,6 @@ namespace Application
   public interface IData
   {
     IQueryable<Link> Links { get; }
+    IQueryable<Comment> Comments { get; }
   }
 }

Application/LinkService.cs

@@ -38,18 +38,6 @@ namespace Application
     /// <returns></returns>
     public LinkDTO[] GetAllLinks()
     {
-      // return (from link in _data.Links
-      //         orderby link.CreatedAt descending
-      //         select new LinkDTO
-      //         {
-      //           Id = link.Id,
-      //           Url = link.Url,
-      //           CreatedAt = link.CreatedAt,
-      //           UpvotesCount = 2,
-      //           DownvotesCount = 4,
-      //           CommentsCount = 54,
-      //         }).ToArray();
-
       return LinksDTO().ToArray();
     }
 
@@ -60,18 +48,30 @@ namespace Application
 
     private IQueryable<LinkDTO> LinksDTO()
     {
-      return _data.Links
-        .Select(link => new LinkDTO
+      return (from link in _data.Links
+              join comment in _data.Comments on link.Id equals comment.LinkId into comments
+              orderby link.CreatedAt descending
+              select new LinkDTO
               {
                 Id = link.Id,
                 Url = link.Url,
                 CreatedAt = link.CreatedAt,
                 UpvotesCount = 2,
                 DownvotesCount = 4,
-          CommentsCount = 54,
-        })
-        // .Where(linkDto => linkDto.UpvotesCount > 5)
-        .OrderByDescending(linkDto => linkDto.CreatedAt);
+                CommentsCount = comments.Count(),
+              });
+
+      // return _data.Links
+      //   .Select(link => new LinkDTO
+      //   {
+      //     Id = link.Id,
+      //     Url = link.Url,
+      //     CreatedAt = link.CreatedAt,
+      //     UpvotesCount = 2,
+      //     DownvotesCount = 4,
+      //     CommentsCount = _data.Comments.Count(comment => comment.LinkId == link.Id),
+      //   })
+      //   .OrderByDescending(linkDto => linkDto.CreatedAt);
     }
   }
 }

Application/PublishCommentCommand.cs

@@ -0,0 +1,14 @@
+using System;
+using System.ComponentModel.DataAnnotations;
+
+namespace Application
+{
+  public class PublishCommentCommand
+  {
+    [Required]
+    public Guid LinkId { get; set; }
+
+    [Required]
+    public string Content { get; set; }
+  }
+}

Domain/Comment.cs

@@ -0,0 +1,20 @@
+using System;
+
+namespace Domain
+{
+  public class Comment
+  {
+    public Guid Id { get; }
+    public Guid LinkId { get; }
+    public string Content { get; }
+    public DateTime CreatedAt { get; }
+
+    internal Comment(Guid linkId, string content)
+    {
+      Id = Guid.NewGuid();
+      LinkId = linkId;
+      Content = content;
+      CreatedAt = DateTime.UtcNow;
+    }
+  }
+}

Domain/ICommentRepository.cs

@@ -0,0 +1,7 @@
+namespace Domain
+{
+  public interface ICommentRepository
+  {
+    void Add(Comment comment);
+  }
+}

Domain/ILinkRepository.cs

@@ -1,7 +1,10 @@
+using System;
+
 namespace Domain
 {
   public interface ILinkRepository
   {
     void Add(Link link);
+    Link GetById(Guid id);
   }
 }

Domain/Link.cs

@@ -17,5 +17,16 @@ namespace Domain
       CreatedAt = DateTime.UtcNow;
       Url = url;
     }
+
+    /// <summary>
+    /// Crée un commentaire pour ce lien. Permet de valider l'existence du lien et
+    /// potentiellement des règles métier de création plus complexes.
+    /// </summary>
+    /// <param name="content"></param>
+    /// <returns></returns>
+    public Comment AddComment(string content)
+    {
+      return new Comment(this.Id, content);
+    }
   }
 }

Infrastructure/Repositories/Memory/CommentRepository.cs

@@ -0,0 +1,21 @@
+using System.Collections.Generic;
+using System.Linq;
+using Domain;
+
+namespace Infrastructure.Repositories.Memory
+{
+  public class CommentRepository : ICommentRepository
+  {
+    public List<Comment> Comments { get; }
+
+    public CommentRepository(params Comment[] comments)
+    {
+      Comments = comments.ToList();
+    }
+
+    public void Add(Comment comment)
+    {
+      Comments.Add(comment);
+    }
+  }
+}

Infrastructure/Repositories/Memory/Data.cs

@@ -7,12 +7,16 @@ namespace Infrastructure.Repositories.Memory
   public class Data : IData
   {
     private readonly LinkRepository _linkRepository;
+    private readonly CommentRepository _commentRepository;
 
     public IQueryable<Link> Links => _linkRepository.Links.AsQueryable();
 
-    public Data(LinkRepository linkRepository)
+    public IQueryable<Comment> Comments => _commentRepository.Comments.AsQueryable();
+
+    public Data(LinkRepository linkRepository, CommentRepository commentRepository)
     {
       _linkRepository = linkRepository;
+      _commentRepository = commentRepository;
     }
   }
 }

Infrastructure/Repositories/Memory/LinkRepository.cs

@@ -1,3 +1,4 @@
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using Domain;
@@ -17,5 +18,10 @@ namespace Infrastructure.Repositories.Memory
     {
       Links.Add(link);
     }
+
+    public Link GetById(Guid id)
+    {
+      return Links.Single(link => link.Id == id);
+    }
   }
 }