import { Injectable, Logger, NotFoundException } from '@nestjs/common';
import { InjectModel } from '@nestjs/sequelize';
import { Op } from 'sequelize';
import { Article } from './models/article.model';
import { CreateArticleDto, QueryArticlesDto, ArticleVo } from './dto/article.dto';
import { ResponseCode } from '../base.dto';

@Injectable()
export class ArticlesService {
  private readonly logger = new Logger(ArticlesService.name);
  constructor(
    @InjectModel(Article)
    private readonly articleModel: typeof Article,
  ) { }

  async create(dto: CreateArticleDto) {
    const article = await this.articleModel.create({
      title: dto.title,
      publishedDate: dto.publishedDate as any,
      htmlContent: dto.htmlContent,
      coverImage: dto.coverImage,
    });
    return { code: ResponseCode.SUCCESS, message: 'success', data: article.toJSON() as ArticleVo };
  }

  async query(params: QueryArticlesDto) {
    const page = Math.max(1, Number(params.page || 1));
    const pageSize = Math.min(100, Math.max(1, Number(params.pageSize || 10)));
    const where: any = {};
    if (params.keyword) {
      where.title = { [Op.like]: `%${params.keyword}%` };
    }
    if (params.startDate || params.endDate) {
      where.publishedDate = {} as any;
      if (params.startDate) (where.publishedDate as any)[Op.gte] = params.startDate as any;
      if (params.endDate) (where.publishedDate as any)[Op.lte] = params.endDate as any;
    }

    const { rows, count } = await this.articleModel.findAndCountAll({
      where,
      order: [['publishedDate', 'DESC'], ['createdAt', 'DESC']],
      offset: (page - 1) * pageSize,
      limit: pageSize,
    });

    return {
      code: ResponseCode.SUCCESS,
      message: 'success',
      data: { list: rows.map(r => r.toJSON() as ArticleVo), total: count, page, pageSize },
    };
  }

  async getAndIncreaseReadCount(id: string) {
    const article = await this.articleModel.findByPk(id);
    if (!article) throw new NotFoundException('文章不存在');
    article.readCount += 1;
    await article.save();
    return { code: ResponseCode.SUCCESS, message: 'success', data: article.toJSON() as ArticleVo };
  }

  async increaseReadCount(id: string) {
    const article = await this.articleModel.findByPk(id);
    if (!article) throw new NotFoundException('文章不存在');
    article.readCount += 1;
    await article.save();
    return { code: ResponseCode.SUCCESS, message: 'success', data: article.toJSON() as ArticleVo };
  }
}