Add project files

T120B165-ImgBoard/Services/CommentService.cs

@@ -0,0 +1,68 @@
+using Microsoft.EntityFrameworkCore;
+using T120B165_ImgBoard.Data;
+using T120B165_ImgBoard.Models;
+using T120B165_ImgBoard.Utils;
+
+namespace T120B165_ImgBoard.Services;
+
+public interface ICommentService
+{
+    Task<Comment> Create(string text, User author, Post post);
+    Task<Comment?> GetById(int commentId);
+    Task<PagedList<Comment>> GetAll(int pageNumber = 1);
+    Task<bool> Delete(Comment comment);
+    Task<Comment> Update(Comment comment);
+}
+
+public class CommentService(ImgBoardContext context): ICommentService
+{
+    private const int PageSize = 20;
+    
+    public async Task<Comment> Create(string text, User author, Post post)
+    {
+        var entry = new Comment
+        {
+            Text = text,
+            Author = author,
+            OriginalPost = post,
+            Created = DateTime.Now,
+        };
+        await context.Comments.AddAsync(entry);
+        await context.SaveChangesAsync();
+        return entry;
+    }
+
+    public async Task<Comment?> GetById(int commentId)
+    {
+        return await context.Comments.Where(t => t.Id == commentId)
+            .Include(b => b.Author)
+            .Include(b => b.OriginalPost)
+            .FirstOrDefaultAsync();
+    }
+
+    public async Task<PagedList<Comment>> GetAll(int pageNumber = 1)
+    {
+        var totalCount = await context.Comments.CountAsync();
+        var items = await context.Comments
+            .Skip((pageNumber - 1) * PageSize)
+            .Take(PageSize)
+            .Include(b => b.Author)
+            .Include(b => b.OriginalPost)
+            .ToListAsync();
+        return new PagedList<Comment>(items, pageNumber, PageSize, totalCount);
+    }
+
+    public async Task<bool> Delete(Comment comment)
+    {
+        context.Comments.Remove(comment);
+        await context.SaveChangesAsync();
+        return true;
+    }
+
+    public async Task<Comment> Update(Comment comment)
+    {
+        context.Comments.Update(comment);
+        await context.SaveChangesAsync();
+        return comment;
+    }
+}