const nav = require("../../data/links.json");

function countLinks(cat) {
  let n = 0;
  const groups = cat.groups || [];
  for (let i = 0; i < groups.length; i++) {
    n += (groups[i].links || []).length;
  }
  return n;
}

function withCounts(categories) {
  return (categories || []).map((c) =>
    Object.assign({}, c, { linkCount: countLinks(c) })
  );
}

Page({
  data: {
    brand: nav.brand || "游民导航",
    tagline: nav.tagline || "",
    footer: nav.footer || "",
    brandIcon: nav.brandIcon || "/icons/_brand.webp",
    categories: withCounts(nav.categories),
    activeId: (nav.categories && nav.categories[0] && nav.categories[0].id) || "",
    activeTitle:
      (nav.categories && nav.categories[0] && nav.categories[0].title) || "",
    theme: "light",
    drawerOpen: false,
    showTop: false,
    toast: "",
    statusBarHeight: 20,
    navBarHeight: 44,
    sheetOpen: false,
    sheetLink: null,
  },

  _jumping: false,
  _sectionTops: [],
  _toastTimer: null,

  onLoad() {
    const sys = wx.getWindowInfo ? wx.getWindowInfo() : wx.getSystemInfoSync();
    const statusBarHeight = sys.statusBarHeight || 20;
    const menu = wx.getMenuButtonBoundingClientRect
      ? wx.getMenuButtonBoundingClientRect()
      : null;
    let navBarHeight = 44;
    if (menu && menu.height) {
      navBarHeight = (menu.top - statusBarHeight) * 2 + menu.height;
    }

    const app = getApp();
    const theme = (app && app.globalData && app.globalData.theme) || "light";

    this.setData({
      statusBarHeight,
      navBarHeight,
      theme,
    });
    this._applyTheme(theme);
  },

  onReady() {
    wx.nextTick(() => this._measureSections());
  },

  onShow() {
    this._applyTheme(this.data.theme);
  },

  onPageScroll(e) {
    const scrollTop = e.scrollTop || 0;
    const showTop = scrollTop > 480;
    if (showTop !== this.data.showTop) {
      this.setData({ showTop });
    }
    if (this._jumping || !this._sectionTops.length) return;

    const marker = scrollTop + this.data.statusBarHeight + this.data.navBarHeight + 24;
    let current = this._sectionTops[0].id;
    for (let i = 0; i < this._sectionTops.length; i++) {
      if (this._sectionTops[i].top <= marker) current = this._sectionTops[i].id;
      else break;
    }
    if (current !== this.data.activeId) {
      const cat = this.data.categories.find((c) => c.id === current);
      this.setData({
        activeId: current,
        activeTitle: (cat && cat.title) || "",
      });
    }
  },

  _measureSections() {
    const query = wx.createSelectorQuery();
    query.selectAll(".cat-panel").boundingClientRect();
    query.selectViewport().scrollOffset();
    query.exec((res) => {
      const rects = (res && res[0]) || [];
      const scroll = (res && res[1]) || { scrollTop: 0 };
      this._sectionTops = rects.map((r) => ({
        id: (r.id || "").replace(/^cat-/, ""),
        top: (r.top || 0) + (scroll.scrollTop || 0),
      }));
    });
  },

  _applyTheme(theme) {
    const dark = theme === "dark";
    wx.setNavigationBarColor({
      frontColor: dark ? "#ffffff" : "#000000",
      backgroundColor: dark ? "#0a0f14" : "#e9eef4",
      animation: { duration: 200, timingFunc: "easeIn" },
    });
    wx.setBackgroundColor({
      backgroundColor: dark ? "#0a0f14" : "#e9eef4",
      backgroundColorTop: dark ? "#0a0f14" : "#e9eef4",
      backgroundColorBottom: dark ? "#0a0f14" : "#e9eef4",
    });
  },

  openDrawer() {
    this.setData({ drawerOpen: true });
  },

  closeDrawer() {
    this.setData({ drawerOpen: false });
  },

  noop() {},

  toggleTheme() {
    const theme = this.data.theme === "dark" ? "light" : "dark";
    this.setData({ theme });
    try {
      wx.setStorageSync("navmini-theme", theme);
    } catch (e) {
      /* ignore */
    }
    const app = getApp();
    if (app && app.globalData) app.globalData.theme = theme;
    this._applyTheme(theme);
  },

  onSelectCategory(e) {
    const id = e.currentTarget.dataset.id;
    if (!id) return;
    const cat = this.data.categories.find((c) => c.id === id);
    this.setData({
      drawerOpen: false,
      activeId: id,
      activeTitle: (cat && cat.title) || "",
    });
    this._jumping = true;
    wx.pageScrollTo({
      selector: `#cat-${id}`,
      duration: 320,
      offsetTop: -(this.data.statusBarHeight + this.data.navBarHeight + 8),
      complete: () => {
        setTimeout(() => {
          this._jumping = false;
          this._measureSections();
        }, 360);
      },
    });
  },

  onTapLink(e) {
    const { id, catid, groupid } = e.currentTarget.dataset;
    let link = null;
    const cat = this.data.categories.find((c) => c.id === catid);
    if (cat) {
      const group = (cat.groups || []).find((g) => g.id === groupid);
      if (group) link = (group.links || []).find((l) => l.id === id);
    }
    if (!link || !link.href) {
      this._showToast("无效链接");
      return;
    }
    this.setData({ sheetOpen: true, sheetLink: link });
  },

  closeSheet() {
    this.setData({ sheetOpen: false, sheetLink: null });
  },

  copySheetUrl() {
    const link = this.data.sheetLink;
    if (!link || !link.href) return;
    wx.setClipboardData({
      data: link.href,
      success: () => {
        this._showToast("已复制，请到浏览器打开");
      },
      fail: () => {
        this._showToast("复制失败");
      },
    });
  },

  backTop() {
    wx.pageScrollTo({ scrollTop: 0, duration: 300 });
  },

  _showToast(msg) {
    if (this._toastTimer) clearTimeout(this._toastTimer);
    this.setData({ toast: msg });
    this._toastTimer = setTimeout(() => {
      this.setData({ toast: "" });
      this._toastTimer = null;
    }, 1800);
  },
});