const { secure, toast } = require("../../utils/api");
Page({
  data: {
    pets: [],
    selected: [],
    walk: null,
    points: [],
    polyline: [],
    latitude: 31.23,
    longitude: 121.47,
    duration: "00:00",
    distance: "0.00",
    share: false,
    busy: false,
    locationError: "",
  },
  onShow() {
    this.load();
    clearInterval(this.clock);
    this.clock = setInterval(() => this.tick(), 1000);
  },
  onHide() {
    this.stopTimers();
  },
  onUnload() {
    this.stopTimers();
  },
  stopTimers() {
    clearInterval(this.clock);
    clearInterval(this.tracker);
    this.clock = null;
    this.tracker = null;
  },
  async load() {
    try {
      const [pets, walks] = await Promise.all([
        secure("/pets"),
        secure("/walks"),
      ]);
      const selected = (wx.getStorageSync("walk_pet_ids") || []).filter((id) =>
        pets.some((p) => p.id === id),
      );
      const walk =
        walks.find((w) => w.status === "active" || w.status === "paused") ||
        null;
      this.setData({ pets, selected, walk });
      if (walk) {
        this.renderWalk(walk);
        if (walk.status === "active") {
          this.track();
          this.point();
        }
      } else {
        clearInterval(this.tracker);
        this.setData({ points: [], polyline: [], duration: "00:00", distance: "0.00", share: false });
      }
    } catch (e) {
      toast(e);
    }
  },
  pick(e) {
    if (this.data.walk) return;
    this.setData({ selected: e.detail.selected });
    wx.setStorageSync("walk_pet_ids", e.detail.selected);
  },
  async start() {
    if (this.data.busy) return;
    if (!this.data.selected.length) {
      wx.showToast({ title: "请选择同行的狗狗", icon: "none" });
      return;
    }
    this.setData({ busy: true, locationError: "" });
    let position;
    try {
      position = await wx.getLocation({ type: "gcj02" });
    } catch (error) {
      this.setData({ busy: false, locationError: "请检查小程序定位权限，开启后再试" });
      toast(new Error("无法取得位置，请检查定位权限"));
      return;
    }
    this.setData({ latitude: position.latitude, longitude: position.longitude });
    try {
      const walk = await secure("/walks", "POST", {
        pet_ids: this.data.selected,
      });
      this.setData({ walk });
      this.track();
      await this.savePoint(position);
    } catch (e) {
      if (this.data.walk) this.setData({ locationError: "轨迹保存失败，请点击重试" });
      toast(e);
    } finally {
      this.setData({ busy: false });
    }
  },
  track() {
    clearInterval(this.tracker);
    this.tracker = setInterval(() => this.point(), 15000);
  },
  async point() {
    if (!this.data.walk || this.data.walk.status !== "active" || this.locating) return;
    this.locating = true;
    try {
      const pos = await wx.getLocation({ type: "gcj02" });
      await this.savePoint(pos);
      this.setData({ locationError: "" });
    } catch (e) {
      if (this.data.walk) this.setData({ locationError: "定位更新失败，请检查定位权限和网络" });
    } finally {
      this.locating = false;
    }
  },
  async savePoint(pos) {
    const walkId = this.data.walk.id;
    const walk = await secure(
      "/walks/" + walkId + "/points",
      "POST",
      { latitude: pos.latitude, longitude: pos.longitude },
    );
    if (this.data.walk && this.data.walk.id === walkId && this.data.walk.status === "active") {
      this.renderWalk(walk);
    }
  },
  renderWalk(walk) {
    const pts = (walk.points || []).map((p) => ({
      latitude: p.latitude,
      longitude: p.longitude,
    }));
    const last = pts[pts.length - 1];
    this.setData({
      walk,
      points: pts,
      polyline:
        pts.length > 1 ? [{ points: pts, color: "#268e6a", width: 5 }] : [],
      latitude: last ? last.latitude : this.data.latitude,
      longitude: last ? last.longitude : this.data.longitude,
      distance: ((walk.distance_meters || 0) / 1000).toFixed(2),
      share: walk.share_enabled,
    });
    this.tick();
  },
  tick() {
    const walk = this.data.walk;
    if (!walk) return;
    const end = walk.ended_at
      ? new Date(walk.ended_at)
      : walk.status === "paused"
        ? new Date(walk.paused_at || Date.now())
        : new Date();
    const sec = Math.max(
      0,
      Math.floor((end - new Date(walk.started_at)) / 1000) -
        (walk.paused_seconds || 0),
    );
    this.setData({
      duration:
        String(Math.floor(sec / 60)).padStart(2, "0") +
        ":" +
        String(sec % 60).padStart(2, "0"),
    });
  },
  async action(e) {
    if (this.data.busy) return;
    const kind = e.currentTarget.dataset.kind;
    this.setData({ busy: true });
    try {
      const walk = await secure(
        "/walks/" + this.data.walk.id + "/" + kind,
        "POST",
      );
      this.renderWalk(walk);
      if (kind === "finish") {
        clearInterval(this.tracker);
        this.setData({ walk: null, points: [], polyline: [], duration: "00:00", distance: "0.00", share: false });
        wx.showToast({ title: "今天的快乐已记录", icon: "success" });
      } else if (kind === "resume") {
        this.track();
        this.point();
      } else {
        clearInterval(this.tracker);
      }
    } catch (err) {
      toast(err);
    } finally {
      this.setData({ busy: false });
    }
  },
  records() {
    wx.navigateTo({ url: "/pages/walk-records/walk-records" });
  },
  async shareChange(e) {
    try {
      const walk = await secure(
        "/walks/" + this.data.walk.id + "/share",
        "PUT",
        { enabled: e.detail.value },
      );
      this.renderWalk(walk);
    } catch (err) {
      toast(err);
    }
  },
  onShareAppMessage() {
    const walk = this.data.walk;
    return {
      title: "肉垫计划 · 看看我们遛到哪儿了 🐾",
      path:
        walk && walk.share_enabled
          ? "/pages/share/share?token=" + walk.share_token
          : "/pages/home/home",
    };
  },
});