comments implement

src/modules/comment/application/use-cases/create-comment/create-comment.use-case.ts

@@ -0,0 +1,42 @@
+import { Inject, Injectable } from '@nestjs/common';
+import { COMMENT_REPOSITORY, type ICommentRepository } from '../../../domain/repositories/comment.repository.interface.js';
+import { ISSUE_REPOSITORY, type IIssueRepository } from '../../../../issue/domain/repositories/issue.repository.interface.js';
+import { IssueNotFoundException } from '../../../../issue/domain/exceptions/issue-not-found.exception.js';
+import { Comment } from '../../../domain/entities/comment.entity.js';
+import { CreateCommentCommand } from './create-comment.command.js';
+import { CommentDto } from '../../dto/comment.dto.js';
+import { CommentAuthorExpanderService } from '../../services/comment-author-expander.service.js';
+import { CommentEventsService } from '../../services/comment-events.service.js';
+
+@Injectable()
+export class CreateCommentUseCase {
+  constructor(
+    @Inject(COMMENT_REPOSITORY)
+    private readonly commentRepository: ICommentRepository,
+    @Inject(ISSUE_REPOSITORY)
+    private readonly issueRepository: IIssueRepository,
+    private readonly commentAuthorExpander: CommentAuthorExpanderService,
+    private readonly commentEventsService: CommentEventsService,
+  ) {}
+
+  async execute(command: CreateCommentCommand): Promise<CommentDto> {
+    // Комментировать можно только видимую пользователю задачу
+    const issue = await this.issueRepository.findById(command.issueId, command.authorId);
+    if (!issue) {
+      throw new IssueNotFoundException(command.issueId);
+    }
+
+    const comment = Comment.create({
+      issueId: command.issueId,
+      authorId: command.authorId,
+      content: command.content,
+    });
+
+    const saved = await this.commentRepository.create(comment);
+    const dto = await this.commentAuthorExpander.expand(saved);
+
+    this.commentEventsService.emit('comment.created', dto);
+
+    return dto;
+  }
+}