/**
 * HomePage - 首页 Page Object
 * 对应页面: pages/index/index
 */
class HomePage {
  constructor(miniProgram) {
    this.mp = miniProgram;
  }

  /**
   * 等待首页加载完成
   */
  async waitForLoad() {
    const { waitForPage } = require('../helpers/automator');
    return waitForPage(this.mp, 'pages/index/index');
  }

  /**
   * 获取首页关键元素
   * @returns {Promise<Object>} 包含轮播图、导航等元素信息
   */
  async getElements() {
    const page = await this.mp.currentPage();
    const elements = {};

    try {
      // 尝试获取轮播图
      const swiperItems = await page.$$('swiper-item');
      elements.bannerCount = swiperItems ? swiperItems.length : 0;
    } catch (e) {
      elements.bannerCount = 0;
    }

    try {
      // 获取课程列表卡片
      const courseCards = await page.$$('.course-card');
      elements.courseCardCount = courseCards ? courseCards.length : 0;
    } catch (e) {
      elements.courseCardCount = 0;
    }

    try {
      // 获取导航按钮
      const navButtons = await page.$$('.nav-item');
      elements.navButtonCount = navButtons ? navButtons.length : 0;
    } catch (e) {
      elements.navButtonCount = 0;
    }

    return elements;
  }

  /**
   * 获取轮播图信息
   * @returns {Promise<Array>} 轮播图列表
   */
  async getBanners() {
    const page = await this.mp.currentPage();
    try {
      const swiperItems = await page.$$('swiper-item');
      if (!swiperItems || swiperItems.length === 0) {
        return [];
      }
      const banners = [];
      for (let i = 0; i < swiperItems.length; i++) {
        try {
          const image = await swiperItems[i].$('image');
          if (image) {
            const src = await image.attribute('src');
            banners.push({ index: i, src });
          }
        } catch (e) {
          banners.push({ index: i, src: null });
        }
      }
      return banners;
    } catch (e) {
      return [];
    }
  }

  /**
   * 通过 TabBar 切换到搜索页
   */
  async navigateToSearch() {
    const { switchTab } = require('../helpers/automator');
    await switchTab(this.mp, 1);
  }

  /**
   * 下拉刷新
   */
  async pullDownRefresh() {
    const page = await this.mp.currentPage();
    // 触发下拉刷新
    await this.mp.callWxMethod('startPullDownRefresh', {});
    await this.mp.waitFor(2000);
  }
}

module.exports = HomePage;