From 6d80795e44ea539f1848457e743479389c5488fc Mon Sep 17 00:00:00 2001
From: Mathis HERRIOT <197931332+0x485254@users.noreply.github.com>
Date: Thu, 29 Jan 2026 15:46:00 +0100
Subject: [PATCH] feat: add WebSocket notifications for new comments

- Introduced enriched comment retrieval with user information and like statistics.
- Implemented WebSocket notifications to notify users of new comments on content.
- Updated dependency injection to include `EventsGateway` and `RealtimeModule`.
---
 backend/src/comments/comments.module.ts       |  3 +-
 backend/src/comments/comments.service.ts      | 33 +++++++++++++++++--
 .../repositories/comments.repository.ts       | 21 ++++++++++++
 3 files changed, 53 insertions(+), 4 deletions(-)

diff --git a/backend/src/comments/comments.module.ts b/backend/src/comments/comments.module.ts
index 2913b98..a8f8e3e 100644
--- a/backend/src/comments/comments.module.ts
+++ b/backend/src/comments/comments.module.ts
@@ -1,5 +1,6 @@
 import { Module } from "@nestjs/common";
 import { AuthModule } from "../auth/auth.module";
+import { RealtimeModule } from "../realtime/realtime.module";
 import { S3Module } from "../s3/s3.module";
 import { CommentsController } from "./comments.controller";
 import { CommentsService } from "./comments.service";
@@ -7,7 +8,7 @@ import { CommentLikesRepository } from "./repositories/comment-likes.repository"
 import { CommentsRepository } from "./repositories/comments.repository";
 
 @Module({
-	imports: [AuthModule, S3Module],
+	imports: [AuthModule, S3Module, RealtimeModule],
 	controllers: [CommentsController],
 	providers: [CommentsService, CommentsRepository, CommentLikesRepository],
 	exports: [CommentsService],
diff --git a/backend/src/comments/comments.service.ts b/backend/src/comments/comments.service.ts
index e1ce823..5868e34 100644
--- a/backend/src/comments/comments.service.ts
+++ b/backend/src/comments/comments.service.ts
@@ -3,6 +3,7 @@ import {
 	Injectable,
 	NotFoundException,
 } from "@nestjs/common";
+import { EventsGateway } from "../realtime/events.gateway";
 import { S3Service } from "../s3/s3.service";
 import type { CreateCommentDto } from "./dto/create-comment.dto";
 import { CommentLikesRepository } from "./repositories/comment-likes.repository";
@@ -14,6 +15,7 @@ export class CommentsService {
 		private readonly commentsRepository: CommentsRepository,
 		private readonly commentLikesRepository: CommentLikesRepository,
 		private readonly s3Service: S3Service,
+		private readonly eventsGateway: EventsGateway,
 	) {}
 
 	async create(userId: string, contentId: string, dto: CreateCommentDto) {
@@ -24,11 +26,36 @@ export class CommentsService {
 			parentId: dto.parentId,
 		});
 
-		// Enrichir le commentaire créé (pour le retour API)
+		// Récupérer le commentaire avec les infos utilisateur pour le WebSocket
+		const enrichedComment = await this.findOneEnriched(comment.id, userId);
+
+		// Notifier les autres utilisateurs sur ce contenu
+		this.eventsGateway.sendToContent(contentId, "new_comment", enrichedComment);
+
+		return enrichedComment;
+	}
+
+	async findOneEnriched(commentId: string, currentUserId?: string) {
+		const comment = await this.commentsRepository.findOneEnriched(commentId);
+		if (!comment) return null;
+
+		const [likesCount, isLiked] = await Promise.all([
+			this.commentLikesRepository.countByCommentId(comment.id),
+			currentUserId
+				? this.commentLikesRepository.isLikedByUser(comment.id, currentUserId)
+				: Promise.resolve(false),
+		]);
+
 		return {
 			...comment,
-			likesCount: 0,
-			isLiked: false,
+			likesCount,
+			isLiked,
+			user: {
+				...comment.user,
+				avatarUrl: comment.user.avatarUrl
+					? this.s3Service.getPublicUrl(comment.user.avatarUrl)
+					: null,
+			},
 		};
 	}
 
diff --git a/backend/src/comments/repositories/comments.repository.ts b/backend/src/comments/repositories/comments.repository.ts
index 4459c0f..1c96859 100644
--- a/backend/src/comments/repositories/comments.repository.ts
+++ b/backend/src/comments/repositories/comments.repository.ts
@@ -45,6 +45,27 @@ export class CommentsRepository {
 		return results[0];
 	}
 
+	async findOneEnriched(id: string) {
+		const results = await this.databaseService.db
+			.select({
+				id: comments.id,
+				text: comments.text,
+				parentId: comments.parentId,
+				createdAt: comments.createdAt,
+				updatedAt: comments.updatedAt,
+				user: {
+					uuid: users.uuid,
+					username: users.username,
+					displayName: users.displayName,
+					avatarUrl: users.avatarUrl,
+				},
+			})
+			.from(comments)
+			.innerJoin(users, eq(comments.userId, users.uuid))
+			.where(and(eq(comments.id, id), isNull(comments.deletedAt)));
+		return results[0];
+	}
+
 	async delete(id: string) {
 		await this.databaseService.db
 			.update(comments)