// pages/index/index.js
const api = require('../../utils/api');
const store = require('../../utils/store');
const config = require('../../config/index');

const app = getApp();
const updateManager = wx.getUpdateManager();

const PAGE_SIZE = 10;

Page({
  data: {
    staticBase: config.STATIC_BASE_URL,
    banners: [],
    courseList: [],
    freeCourseList: [],
    articles: [],
    page: 1,
    articleTotal: 0,
    loadingMore: false,
    noMore: false,
    title1: '',
    title2: '',
    title3: '',
    footerText: '',
  },

  onLoad() {
    // 等应用初始化完成再取配置，避免首屏读到空缓存
    app.ready().then(() => this.applyConfig());
    this.loadAll();
  },

  applyConfig() {
    this.setData({
      title1: store.cfg('home.title.paid'),
      title2: store.cfg('home.title.trial'),
      title3: store.cfg('home.title.public'),
      footerText: store.cfg('home.footer_text'),
    });
  },

  loadAll() {
    this.setData({ page: 1, noMore: false });

    api
      .getBanners()
      .then((list) => this.setData({ banners: list || [] }))
      .catch((err) => console.error('[index] 轮播加载失败', err));

    api
      .getHomeCourses()
      .then((list) => this.setData({ courseList: list || [] }))
      .catch((err) => console.error('[index] 新课加载失败', err));

    api
      .getHomeFreeCourses()
      .then((list) => this.setData({ freeCourseList: list || [] }))
      .catch((err) => console.error('[index] 试听列表加载失败', err));

    api
      .getArticles(1, PAGE_SIZE)
      .then((res) => this.setData({ articles: res.items || [], articleTotal: res.total || 0, page: 1 }))
      .catch((err) => console.error('[index] 文章加载失败', err));
  },

  onShow() {
    updateManager.onCheckForUpdate(() => {});
    updateManager.onUpdateReady(() => {
      wx.showModal({
        title: '更新提示',
        showCancel: false,
        content: '新版本已准备好，即将重启应用',
        success: (res) => {
          if (res.confirm) updateManager.applyUpdate();
        },
      });
    });
    updateManager.onUpdateFailed(() => {});
  },

  onPullDownRefresh() {
    Promise.all([this.reload()]).then(() => wx.stopPullDownRefresh());
  },

  async reload() {
    try {
      const cfg = await api.getConfig();
      store.setSiteConfig(cfg);
      this.applyConfig();
    } catch (err) {
      console.warn('[index] 配置刷新失败', err);
    }
    this.loadAll();
  },

  onReachBottom() {
    if (this.data.loadingMore || this.data.noMore) return;
    const next = this.data.page + 1;
    this.setData({ loadingMore: true });

    api
      .getArticles(next, PAGE_SIZE)
      .then((res) => {
        const merged = this.data.articles.concat(res.items || []);
        this.setData({
          articles: merged,
          page: next,
          loadingMore: false,
          noMore: merged.length >= (res.total || 0),
        });
      })
      .catch((err) => {
        console.error('[index] 加载更多失败', err);
        this.setData({ loadingMore: false });
      });
  },

  toArticle(e) {
    wx.navigateTo({ url: '/pages/WebPageDetails/WebPageDetails?id=' + e.currentTarget.dataset.id });
  },

  toNewCourse(e) {
    wx.navigateTo({ url: '/pages/IndexNewCourseDetails/IndexNewCourseDetails?id=' + e.currentTarget.dataset.id });
  },

  toFreeCourse(e) {
    wx.navigateTo({
      url: '/pages/IndexFreeCourseDetails/IndexFreeCourseDetails?seriesNo=' + e.currentTarget.dataset.series,
    });
  },

  onShareAppMessage() {
    return { title: '叶雷讲数学', path: '/pages/index/index' };
  },

  onShareTimeline() {
    return { title: '叶雷讲数学' };
  },
});