// pages/VideoDetails/VideoDetails.js
const api = require('../../utils/api');
const store = require('../../utils/store');
const format = require('../../utils/format');

const app = getApp();

Page({
  data: {
    code: '',
    owned: false,
    loading: true,
    buyText: '',
    contactText: '',
    VideoTitle: '',
    VideoDetails: '',
    coverUrl: '',
    playdata: [],
    /** 列表上方的更新期数文案，整句来自后台配置 */
    updatedText: '',
    VideoPlayerSrc: '',
    HiddenVideoControl: true,
    top: 0,
  },

  onLoad(options) {
    const code = options.code;
    if (!code) {
      wx.switchTab({ url: '/pages/kecheng/kecheng' });
      return;
    }
    this.setData({ code: code });
  },

  /** 首次进入和从购买页返回都会走这里：买完回来要立刻变成已拥有。 */
  onShow() {
    app.ready().then(() => this.applyConfig());
    if (this.data.code) this.load(this.data.code);
  },

  /** 按钮文案取自后台配置，后台改完小程序下拉刷新即可生效。 */
  applyConfig() {
    this.setData({
      buyText: store.cfg('course.button.buy'),
      contactText: store.cfg('course.button.contact'),
    });
  },

  load(code) {
    api
      .getCourse(code)
      .then((course) => {
        this.setData({
          loading: false,
          owned: course.owned,
          VideoTitle: course.title || '',
          VideoDetails: course.intro || '',
          coverUrl: course.coverUrl || '',
        });
        if (course.owned) this.loadLessons(code);
      })
      .catch((err) => {
        this.setData({ loading: false });
        wx.showToast({ title: err.message || store.cfg('course.tip.loadFailed'), icon: 'none' });
        setTimeout(() => wx.switchTab({ url: '/pages/kecheng/kecheng' }), 1500);
      });
  },

  loadLessons(code) {
    api
      .getLessons(code)
      .then((list) => {
        const rows = (list || []).map((item) => ({
          chapterId: item.chapterId,
          playId: item.playId,
          chapterTitle: item.chapterTitle,
          lessonTitle: item.lessonTitle,
          duration: item.duration,
          publishedAt: format.toDateString(item.publishedAt),
          coverUrl: item.coverUrl,
        }));
        // 期数文案整句来自后台配置，{n} 在这里替换成实际条数
        this.setData({
          playdata: rows,
          updatedText: store.cfg('course.lesson.updated').replace('{n}', rows.length),
        });
      })
      .catch((err) => {
        this.setData({ playdata: [] });
        console.warn('[VideoDetails] 课时加载失败', err);
      });
  },

  /** 点课时：向后端换一次性播放地址，视频本身不直接暴露。 */
  onTapLesson(e) {
    const item = this.data.playdata[e.currentTarget.dataset.index];
    if (!item) return;

    wx.showLoading({ title: '加载中', mask: true });
    api
      .getPlayUrl(this.data.code, item.chapterId, item.playId)
      .then((res) => {
        wx.hideLoading();
        this.setData({ VideoPlayerSrc: res.url, HiddenVideoControl: false, top: 420 });
      })
      .catch((err) => {
        wx.hideLoading();
        wx.showToast({ title: err.message || store.cfg('course.tip.playFailed'), icon: 'none' });
      });
  },

  /** 购买入口：详情页不做交易，统一跳商业化页面。 */
  goBuy() {
    if (!this.data.code) return;
    // 已经拥有就不必再进购买页：原地提示一句
    if (this.data.owned) {
      wx.showToast({ title: store.cfg('course.tip.owned'), icon: 'none' });
      return;
    }
    wx.navigateTo({ url: '/pages/buy/buy?code=' + this.data.code });
  },

  onShareAppMessage() {
    return { title: store.cfg('share.title'), path: '/pages/index/index' };
  },
});