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

const app = getApp();

const PAGE_SIZE = 10;

/** 广播文字默认色（红），配置里没填或填得不像颜色时用它 */
const DEFAULT_BROADCAST_COLOR = '#e60012';

/**
 * 只认安全的颜色写法，其余一律回退默认色。
 * 后台是文本框，填错一个字符不该把首页样式搞坏，也不该让这个值变成注入点。
 */
function safeColor(value) {
  const v = String(value || '').trim();
  if (/^#[0-9a-fA-F]{3}$|^#[0-9a-fA-F]{6}$|^#[0-9a-fA-F]{8}$/.test(v)) return v;
  if (/^rgba?\([\d\s.,%]+\)$/.test(v)) return v;
  if (/^hsla?\([\d\s.,%]+\)$/.test(v)) return v;
  if (/^[a-zA-Z]{3,20}$/.test(v)) return v; // red / orange / tomato ...
  return DEFAULT_BROADCAST_COLOR;
}

Page({
  data: {
    staticBase: config.STATIC_BASE_URL,
    banners: [],
    courseList: [],
    freeCourseList: [],
    articles: [],
    page: 1,
    articleTotal: 0,
    loadingMore: false,
    noMore: false,
    title1: '',
    title2: '',
    title3: '',
    footerText: '',
    /** 首页信息广播文案，空则不显示整条 */
    broadcast: '',
    /** 文案超出宽度时才横向滚动 */
    broadcastScroll: false,
    /** 广播文字颜色，取自 home.broadcast_color */
    broadcastColor: DEFAULT_BROADCAST_COLOR,
  },

  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'),
        broadcast: store.cfg('home.broadcast') || '',
        broadcastColor: safeColor(store.cfg('home.broadcast_color')),
        broadcastScroll: false,
      },
      // 等渲染完再量宽度：只有真放不下才让它滚动，短文案就静静居中
      () => this.measureBroadcast(),
    );
  },

  /** 量一下广播文字有没有超出容器，超了才加滚动动画。量不到就当不超。 */
  measureBroadcast() {
    if (!this.data.broadcast) return;
    const query = wx.createSelectorQuery().in(this);
    query.select('.broadcast-body').boundingClientRect();
    query.select('.broadcast-text').boundingClientRect();
    query.exec((res) => {
      const box = res && res[0];
      const text = res && res[1];
      if (!box || !text) return;
      if (text.width > box.width) this.setData({ broadcastScroll: true });
    });
  },

  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));
  },

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

  onShareTimeline() {
    return { title: store.cfg('share.title') };
  },
});