Add one long hierarchical method, change some return codes

T120B165-ImgBoard/Controllers/TagController.cs

@@ -1,6 +1,6 @@
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
-using T120B165_ImgBoard.Dtos;
+using T120B165_ImgBoard.Dtos.Comment;
 using T120B165_ImgBoard.Dtos.Tag;
 using T120B165_ImgBoard.Models;
 using T120B165_ImgBoard.Services;
@@ -10,7 +10,10 @@ namespace T120B165_ImgBoard.Controllers;
 
 [ApiController]
 [Route("api/tags")]
-public class TagController(ITagService tagService) : ControllerBase
+public class TagController(
+    ITagService tagService,
+    IPostService postService,
+    ICommentService commentService) : ControllerBase
 {
     /// <summary>
     /// Creates a new tag.
@@ -126,4 +129,34 @@ public class TagController(ITagService tagService) : ControllerBase
         var updatedTag = await tagService.Update(tag, dto.Type);
         return Ok(updatedTag);
     }
+    
+    
+    /// <summary>
+    /// Get specific tag, specific post comment.
+    /// </summary>
+    /// <param name="tagName">Tag name</param>
+    /// <param name="postId">Post ID</param>
+    /// <param name="commentId">Comment ID</param>
+    /// <response code="200">Comment data</response>
+    /// <response code="400">If request is malformed</response>
+    /// <response code="404">If tag or post or comment is not found</response>
+    [HttpGet("{tagName}/posts/{postId:int}/comments/{commentId:int}")]
+    [ProducesResponseType(StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status400BadRequest)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    public async Task<ActionResult<CommentDto>> GetComment(string tagName, int postId, int commentId)
+    {
+        var tag = await tagService.GetByName(tagName);
+        if (tag == null) return NotFound();
+        
+        var entry = await postService.GetById(postId);
+        if (entry == null) return NotFound();
+        
+        if (entry.Tags.All(t => t.Name != tag.Name)) return NotFound();
+        
+        var comment = await commentService.GetById(commentId);
+        if (comment == null || entry.Id != comment.OriginalPost.Id) return NotFound();
+        
+        return Ok(CommentDto.FromComment(comment));
+    }
 }