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

// "2026-07-04" → "7月4日"
function fmtMD(date) {
  if (!date) return '';
  const p = date.split('-');
  if (p.length < 3) return '';
  return +p[1] + '月' + +p[2] + '日';
}

function pad2(n) {
  return n < 10 ? '0' + n : '' + n;
}

function buildCells(year, month, taskedDays, today) {
  const first = new Date(year, month - 1, 1);
  const lead = (first.getDay() + 6) % 7; // 周一为一周起点
  const daysInMonth = new Date(year, month, 0).getDate();
  const set = {};
  (taskedDays || []).forEach((d) => (set[d] = true));
  const cells = [];
  for (let i = 0; i < lead; i++) cells.push({ day: 0 });
  for (let d = 1; d <= daysInMonth; d++) {
    cells.push({ day: d, date: year + '-' + pad2(month) + '-' + pad2(d), tasked: !!set[d], today: d === today });
  }
  return cells;
}

Page({
  data: {
    pet: {},
    planView: 'timeline',
    plan: null,
    calCells: [],
    calLabel: '',
    calLoaded: false,
    selectedCalDate: '',
    dayDetail: null,
    aiInput: '',
    aiPlan: null,
    aiBusy: false,
    sheetShow: false,
    sheetType: '',
  },
  onLoad() {
    this._unsub = store.subscribe((pet) => {
      this.setData({ pet, calLoaded: false });
      this.loadTimeline();
      if (this.data.planView === 'calendar') this.loadCalendar();
    });
  },
  onUnload() {
    if (this._unsub) this._unsub();
  },
  onShow() {
    if (typeof this.getTabBar === 'function' && this.getTabBar()) {
      this.getTabBar().setData({ selected: 1 });
    }
    store
      .ready()
      .then(() => {
        this.setData({ pet: store.getPet() });
        this.loadTimeline();
      })
      .catch((e) => wx.showToast({ title: e.message || '加载失败', icon: 'none' }));
  },
  loadTimeline() {
    const id = store.currentPetId();
    if (!id) return;
    api
      .getPlan(id)
      .then((plan) => {
        if (plan && plan.tasks) {
          plan.tasks = plan.tasks.map((t) => ({ ...t, dateLabel: fmtMD(t.date) }));
        }
        this.setData({ plan });
      })
      .catch(() => this.setData({ plan: null }));
  },
  loadCalendar() {
    const id = store.currentPetId();
    if (!id) return;
    api
      .planCalendar(id)
      .then((res) => {
        this.setData({
          calCells: buildCells(res.year, res.month, res.tasked_days, res.today),
          calLabel: `${res.year} 年 ${res.month} 月`,
          calLoaded: true,
        });
        if (res.today) {
          this.selectCalDay(res.year + '-' + pad2(res.month) + '-' + pad2(res.today));
        }
      })
      .catch(() => {});
  },
  onTapCalDay(e) {
    const date = e.currentTarget.dataset.date;
    if (date) this.selectCalDay(date);
  },
  selectCalDay(date) {
    const id = store.currentPetId();
    if (!id) return;
    this.setData({ selectedCalDate: date });
    api
      .dayPlan(id, date)
      .then((res) => {
        const nodes = (res.plan_nodes || []).map((n) => ({ title: n.title, desc: n.description, done: n.done }));
        const tasks = (res.tasks || []).map((t) => ({ title: t.title, desc: t.description, done: t.done }));
        const reminders = (res.reminders || []).map((r) => ({ title: r.title }));
        this.setData({
          dayDetail: { date, nodes, tasks, reminders, empty: !nodes.length && !tasks.length && !reminders.length },
        });
      })
      .catch(() => {});
  },
  switchPlanView(e) {
    const view = e.currentTarget.dataset.view;
    this.setData({ planView: view });
    if (view === 'calendar' && !this.data.calLoaded) this.loadCalendar();
  },
  // 计划明细勾选
  toggleTimelineTask(e) {
    const id = e.currentTarget.dataset.id;
    api.togglePlanTask(id).then(() => this.loadTimeline()).catch(() => {});
  },
  // AI 计划
  onAiInput(e) {
    this.setData({ aiInput: e.detail.value });
  },
  genAIPlan() {
    const id = store.currentPetId();
    const input = (this.data.aiInput || '').trim();
    if (!id || !input) {
      wx.showToast({ title: '先描述一下情况', icon: 'none' });
      return;
    }
    this.setData({ aiBusy: true });
    wx.showLoading({ title: 'AI 生成中...' });
    api
      .createAIPlan(id, input)
      .then((plan) => {
        wx.hideLoading();
        this.setData({ aiPlan: plan, aiBusy: false });
      })
      .catch((err) => {
        wx.hideLoading();
        this.setData({ aiBusy: false });
        wx.showToast({ title: err.message || '生成失败', icon: 'none' });
      });
  },
  applyAIPlan() {
    const p = this.data.aiPlan;
    if (!p) return;
    api
      .applyAIPlan(p.id)
      .then(() => wx.showToast({ title: '已加入我的计划', icon: 'success' }))
      .catch((err) => wx.showToast({ title: err.message || '加入失败', icon: 'none' }));
  },
  openSheet(e) {
    const type = e.currentTarget.dataset.type;
    if (!type) return; // 无关联动作的计划项只可勾选，不弹层
    this.setData({ sheetType: type, sheetShow: true });
  },
  closeSheet() {
    this.setData({ sheetShow: false });
  },
  onAddPet() {
    this.setData({ sheetType: 'addPet', sheetShow: true });
  },
  onFab() {
    this.setData({ sheetType: 'ai', sheetShow: true });
  },
  onShareAppMessage() {
    return { title: '我给毛孩子做了份养护计划', path: '/pages/plan/plan' };
  },
  onShareTimeline() {
    return { title: '我给毛孩子做了份养护计划' };
  },
});