const completion = require("../../utils/task-completion");
const { secure } = require("../../utils/api");
const { localDate } = require("../../utils/date");
const environment = require("../../utils/environment");
function dateLabel() {
  const now = new Date();
  return `${now.getMonth() + 1}月${now.getDate()}日 周${"日一二三四五六"[now.getDay()]}`;
}
function accountKey() {
  const state = getApp().globalData || {};
  return (state.user && state.user.id) || state.token || "";
}
Page({
  data: {
    locationName: "当前位置",
    headerSubtitle: dateLabel() + " · 轻触获取天气",
    pets: [],
    selected: [],
    tasks: [],
    taskBusyIds: [],
    completingAll: false,
    undoneCount: 0,
    walkCount: 0,
    name: "铲屎官",
    loading: true,
    ready: false,
    phase: "auth",
    error: "",
  },
  onLoad() {
    const cached = getApp().homeSnapshot;
    if (cached && cached.account === accountKey() && cached.date === localDate()) {
      this.setData({ ...cached.data, ready: true, phase: "ready", loading: false });
    }
  },
  onShow() {
    this.applyEnvironment(environment.cached());
    this.load();
  },
  onHide() {
    this.rememberHome();
  },
  onUnload() {
    this.rememberHome();
    this.disposed = true;
  },
  rememberHome() {
    if (!this.data.ready || !accountKey()) return;
    const { pets, selected, tasks, undoneCount, walkCount, name } = this.data;
    getApp().homeSnapshot = {
      account: accountKey(),
      date: localDate(),
      data: { pets, selected, tasks, undoneCount, walkCount, name },
    };
  },
  updateEnvironmentLabel() {
    this.setData({
      headerSubtitle:
        dateLabel() + " · " + (this.weatherLabel || "轻触获取天气"),
    });
  },
  applyEnvironment(value) {
    if (this.disposed) return;
    if (value) {
      this.weatherLabel = value.weatherLabel;
      this.setData({ locationName: value.locationName });
    }
    this.updateEnvironmentLabel();
  },
  async refreshEnvironment(event) {
    if (this.environmentBusy) return;
    this.environmentBusy = true;
    const tapped = !!event;
    const cached = environment.cached();
    if (!cached) {
      this.weatherLabel = "正在获取天气";
      this.updateEnvironmentLabel();
    }
    try {
      this.applyEnvironment(await environment.refresh(tapped));
    } catch (error) {
      if (this.disposed) return;
      if (cached) {
        this.applyEnvironment(cached);
      } else {
        const denied = /denied|deny|auth/.test(
          error.errMsg || error.message || "",
        );
        this.setData({ locationName: denied ? "开启定位" : "定位暂不可用" });
        this.weatherLabel = denied ? "轻触开启定位" : "轻触重试";
        this.updateEnvironmentLabel();
      }
      if (tapped) toast(error);
    } finally {
      this.environmentBusy = false;
    }
  },
  async load() {
    if (this.loadPromise) return this.loadPromise;
    this.loadPromise = this.loadHome().finally(() => {
      this.loadPromise = null;
    });
    return this.loadPromise;
  },
  async loadHome() {
    this.setData({
      loading: true,
      error: "",
      phase: this.data.ready ? "data" : "auth",
    });
    let authenticated = false;
    try {
      await getApp().login();
      authenticated = true;
      if (this.disposed) return;
      this.setData({ phase: "data" });
      const [pets, tasks, walks, me] = await Promise.all([
        secure("/pets"),
        secure("/tasks"),
        secure("/walks"),
        secure("/me"),
      ]);
      if (this.disposed) return;
      const chosen = wx.getStorageSync("walk_pet_ids") || [],
        month = localDate().slice(0, 7);
      this.setData({
        pets,
        selected: chosen.filter((id) => pets.some((p) => p.id === id)),
        tasks: tasks.items,
        undoneCount: tasks.items.filter((t) => !t.completed).length,
        walkCount: walks.filter((w) => w.started_at.slice(0, 7) === month)
          .length,
        name: me.nickname || "毛孩家长",
        loading: false,
        ready: true,
        phase: "ready",
      });
      this.rememberHome();
      // Location permission and weather never hold up the first usable screen.
      this.refreshEnvironment();
    } catch (error) {
      if (this.disposed) return;
      this.setData({
        loading: false,
        phase: !authenticated && !this.data.ready ? "auth-error" : "data-error",
        error: error.message || "暂时没能连接，请稍后重试",
      });
    }
  },
  addPet() {
    wx.navigateTo({ url: "/pages/pet-edit/pet-edit" });
  },
  pick(e) {
    this.setData({ selected: e.detail.selected });
    wx.setStorageSync("walk_pet_ids", e.detail.selected);
  },
  start() {
    if (!this.data.selected.length) {
      wx.showToast({ title: "先选择一起出门的狗狗", icon: "none" });
      return;
    }
    wx.redirectTo({ url: "/pages/walk/walk" });
  },
  goTasks() {
    wx.redirectTo({ url: "/pages/tasks/tasks" });
  },
  goWalks() {
    wx.navigateTo({ url: "/pages/walk-records/walk-records" });
  },
  complete(e) {
    return completion.complete(
      this,
      this.data.tasks.find((t) => t.id === e.currentTarget.dataset.id),
    );
  },
  completeAll() {
    return completion.completeAll(this);
  },
});