import { Inject, Injectable } from '@nestjs/common';
import {
  ARTICLE_REPOSITORY,
  type IArticleRepository,
} from '../../../domain/repositories/article.repository.interface.js';
import { ArticleNotFoundException } from '../../../domain/exceptions/article-not-found.exception.js';
import { GetArticleQuery } from './get-article.query.js';
import { ArticleDto } from '../../dto/article.dto.js';
import { ArticleApplicationMapper } from '../../mappers/article-application.mapper.js';

@Injectable()
export class GetArticleUseCase {
  constructor(
    @Inject(ARTICLE_REPOSITORY)
    private readonly articleRepository: IArticleRepository,
  ) {}

  async execute(query: GetArticleQuery): Promise<ArticleDto> {
    const article = await this.articleRepository.findById(query.id);

    if (!article) {
      throw new ArticleNotFoundException(query.id);
    }

    return ArticleApplicationMapper.toDto(article);
  }
}