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

const GENDERS = ['男孩', '女孩', '不确定'];

// 与后端 service.AgeStages 一致：「刚到家」不是年龄阶段，它由到家日期单独决定
const STAGE_OPTIONS = [
  { key: '幼年期', desc: '疫苗针次、驱虫、体重增长、社会化训练' },
  { key: '成年期', desc: '体重控制、口腔、日常健康管理' },
  { key: '老年期', desc: '慢病监测、半年体检、用药与护理' },
];

function today() {
  const d = new Date();
  const p = (n) => (n < 10 ? '0' + n : '' + n);
  return d.getFullYear() + '-' + p(d.getMonth() + 1) + '-' + p(d.getDate());
}

function monthsSince(dateStr) {
  const b = new Date(dateStr);
  const now = new Date();
  let m = (now.getFullYear() - b.getFullYear()) * 12 + (now.getMonth() - b.getMonth());
  if (now.getDate() < b.getDate()) m--;
  return m < 0 ? 0 : m;
}

// 与后端 StageFromBirthday 同一套规则：12 月龄成年、7 岁进入老年
function stageFromBirthday(birthday) {
  if (!birthday) return '';
  const m = monthsSince(birthday);
  if (m < 12) return '幼年期';
  if (m >= 84) return '老年期';
  return '成年期';
}

function ageFromBirthday(bdayStr) {
  if (!bdayStr) return '';
  const b = new Date(bdayStr);
  const now = new Date();
  let months = (now.getFullYear() - b.getFullYear()) * 12 + (now.getMonth() - b.getMonth());
  if (months < 0) months = 0;
  return months < 24 ? months + '个月' : Math.floor(months / 12) + '岁';
}

Page({
  data: {
    step: 0,
    petType: '猫猫',
    petEmoji: '🐱',
    petName: '',
    birthday: '',
    genderIdx: 0,
    weight: '',
    arrivedAt: '',
    today: '',
    stage: '',
    stageAuto: '',
    stageOptions: STAGE_OPTIONS,
    goals: [
      { label: '不知道每天该做什么', on: true },
      { label: '疫苗驱虫怕忘记', on: true },
      { label: '想记录体重和健康', on: false },
      { label: '担心生病不会判断', on: false },
      { label: '想控制养宠开销', on: false },
      { label: '想生成成长报告', on: false },
    ],
    submitting: false,
  },
  onLoad() {
    this.setData({ today: today(), arrivedAt: today() });
    // 已有宠物则直接进首页
    store
      .ready()
      .then(() => {
        if (store.getPets().length > 0) {
          wx.switchTab({ url: '/pages/home/home' });
        }
      })
      .catch(() => {});
  },
  nextStep() {
    this.setData({ step: Math.min(this.data.step + 1, 5) });
  },
  choosePet(e) {
    const { type, emoji } = e.currentTarget.dataset;
    this.setData({ petType: type, petEmoji: emoji });
  },
  onName(e) { this.setData({ petName: e.detail.value }); },
  onWeight(e) { this.setData({ weight: e.detail.value }); },
  onBirthday(e) {
    const birthday = e.detail.value;
    const auto = stageFromBirthday(birthday);
    const patch = { birthday, stageAuto: auto };
    // 用户手动选过就尊重他的选择，否则跟着生日走
    if (!this._stageTouched) patch.stage = auto;
    this.setData(patch);
  },
  onArrived(e) { this.setData({ arrivedAt: e.detail.value }); },
  selectGender(e) { this.setData({ genderIdx: Number(e.currentTarget.dataset.index) }); },
  // 先随便看看：不建数据，直接进首页浏览（无宠物时首页显示空态）
  skipBrowse() { wx.switchTab({ url: '/pages/home/home' }); },
  savePetNext() {
    if (!(this.data.petName || '').trim()) {
      wx.showToast({ title: '给它起个名字吧', icon: 'none' });
      return;
    }
    const w = parseFloat(this.data.weight);
    // 体重会进趋势图和用药剂量参考，乱填不如不填
    if (this.data.weight && !(w > 0 && w < 120)) {
      wx.showToast({ title: '体重看起来不太对', icon: 'none' });
      return;
    }
    if (!this.data.birthday) {
      wx.showToast({ title: '生日决定疫苗和驱虫节奏，估个大概也行', icon: 'none' });
      return;
    }
    this.nextStep();
  },
  chooseStage(e) {
    const stage = e.currentTarget.dataset.stage;
    const auto = this.data.stageAuto;
    // 改成和生日矛盾的阶段是允许的（领养估的生日可能不准，大型犬发育也慢），
    // 但要先说清楚代价：阶段决定疫苗针次怎么排，选错会漏针
    if (auto && stage !== auto) {
      wx.showModal({
        title: '和生日对不上',
        content: `按生日算它应该在「${auto}」。改成「${stage}」的话，疫苗针次和驱虫周期会按${stage}安排。确定要改吗？`,
        confirmText: '确定改',
        success: (res) => {
          if (res.confirm) {
            this._stageTouched = true;
            this.setData({ stage });
          }
        },
      });
      return;
    }
    this._stageTouched = true;
    this.setData({ stage });
  },
  toggleGoal(e) {
    const i = e.currentTarget.dataset.index;
    this.setData({ [`goals[${i}].on`]: !this.data.goals[i].on });
  },
  async submit() {
    if (this.data.submitting) return;
    this.setData({ submitting: true });
    wx.showLoading({ title: '生成计划中...' });
    const body = {
      name: (this.data.petName || '').trim(),
      emoji: this.data.petEmoji,
      type: this.data.petType,
      gender: GENDERS[this.data.genderIdx],
      birthday: this.data.birthday,
      arrived_at: this.data.arrivedAt,
      weight: this.data.weight,
      stage: this.data.stage || this.data.stageAuto,
      age: ageFromBirthday(this.data.birthday),
      goals: this.data.goals.filter((g) => g.on).map((g) => g.label),
    };
    try {
      await store.ready();
      await api.onboarding(body);
      await store.loadPets();
      wx.hideLoading();
      wx.switchTab({ url: '/pages/home/home' });
    } catch (e) {
      wx.hideLoading();
      wx.showToast({ title: e.message || '创建失败', icon: 'none' });
      this.setData({ submitting: false });
    }
  },
  finishOnboard() { this.submit(); },
});