const store = require('../../utils/store.js');
const api = require('../../utils/api.js');
const recordTypes = require('../../utils/recordTypes.js');
const { toastErr } = require('../../utils/ui.js');

function pad2(n) {
  return n < 10 ? '0' + n : '' + n;
}
function today() {
  const d = new Date();
  return d.getFullYear() + '-' + pad2(d.getMonth() + 1) + '-' + pad2(d.getDate());
}
// 同 addrecord：后端用 time.Parse(time.RFC3339) 解 occurred_at，只给日期解不出来会
// 静默回退成 now；时区要带真实偏移，转 UTC 的 Z 形式落库会把边界日期挪一天
function dayToISO(day) {
  if (!day) return '';
  const off = -new Date().getTimezoneOffset();
  const sign = off >= 0 ? '+' : '-';
  const a = Math.abs(off);
  return day + 'T12:00:00' + sign + pad2(Math.floor(a / 60)) + ':' + pad2(a % 60);
}
function fmtDay(iso) {
  if (!iso) return '';
  const d = new Date(iso);
  return d.getMonth() + 1 + '月' + d.getDate() + '日';
}

const PAGE = 50;

Page({
  data: {
    bill: {},
    cats: [],
    cat: '',
    customOn: false,
    customCat: '',
    amount: '',
    date: '',
    note: '',
    list: [],
    saving: false,
  },
  onLoad() {
    this.setData({ date: today() });
    store
      .ready()
      .then(() => recordTypes.load())
      .then(() => this.loadCats())
      .catch((e) => toastErr(e));
  },
  onShow() {
    if (this._inited) this.reload();
    this._inited = true;
  },
  onReady() {
    this.reload();
  },
  // 类别预置读 record_types 里 cost 的字段配置——后台改一处，
  // 这页和 addrecord 同时生效，不会出现两套类别把账单统计切开
  loadCats() {
    const t = recordTypes.get('cost');
    const opt = ((t && t.fields) || []).find((f) => f.kind === 'options');
    this.setData({ cats: (opt && opt.options) || [] });
  },
  reload() {
    const id = store.currentPetId();
    if (!id) return;
    api
      .getBill(id, 'month')
      .then((bill) => this.setData({ bill: bill || {} }))
      .catch(() => {});
    api
      .getRecords(id, { type: 'cost', page: 1, pageSize: PAGE })
      .then((res) => {
        const now = new Date();
        const list = (res.list || [])
          // 只显示本月：接口按时间倒序返回，这里前端切一刀，
          // 不为了「本月」再加一个后端参数
          .filter((r) => {
            const d = new Date(r.occurred_at);
            return d.getFullYear() === now.getFullYear() && d.getMonth() === now.getMonth();
          })
          .map((r) => ({ ...r, timeText: fmtDay(r.occurred_at) }));
        this.setData({ list });
      })
      .catch(() => {});
  },
  onAmount(e) {
    this.setData({ amount: e.detail.value });
  },
  onPickCat(e) {
    const v = e.currentTarget.dataset.val;
    this.setData({ cat: this.data.cat === v ? '' : v, customOn: false, customCat: '' });
  },
  toggleCustom() {
    const on = !this.data.customOn;
    this.setData({ customOn: on, cat: on ? '' : this.data.cat });
  },
  onCustomCat(e) {
    this.setData({ customCat: e.detail.value });
  },
  onDate(e) {
    this.setData({ date: e.detail.value });
  },
  onNote(e) {
    this.setData({ note: e.detail.value });
  },
  onSave() {
    if (this.data.saving) return;
    const id = store.currentPetId();
    if (!id) return wx.showToast({ title: '先建一份宠物档案', icon: 'none' });
    const amt = parseFloat(this.data.amount);
    if (!(amt > 0)) return wx.showToast({ title: '填一个金额', icon: 'none' });
    const cat = (this.data.customOn ? this.data.customCat : this.data.cat).trim();
    if (!cat) return wx.showToast({ title: '选一个类别', icon: 'none' });

    this.setData({ saving: true });
    // 落的是 type='cost' 的普通记录：金额进 num_value、类别进 category，
    // 和 addrecord 走同一条路，报告页的账单聚合照样认
    api
      .createRecord(id, {
        type: 'cost',
        title: '记账：' + amt + '元 ' + cat,
        num_value: amt,
        category: cat,
        description: (this.data.note || '').trim(),
        occurred_at: dayToISO(this.data.date),
      })
      .then(() => {
        this.setData({ saving: false, amount: '', note: '', customCat: '', customOn: false, cat: '' });
        wx.showToast({ title: '已记下', icon: 'success' });
        this.reload();
      })
      .catch((e) => {
        this.setData({ saving: false });
        toastErr(e, '保存失败');
      });
  },
  // 长按删除。流水里记错一笔很常见，不给删的话账单就一直是错的
  onDelete(e) {
    const id = e.currentTarget.dataset.id;
    wx.showModal({
      title: '删掉这笔？',
      content: '删了账单统计会跟着变。',
      confirmColor: '#EE7D73',
      success: (r) => {
        if (!r.confirm) return;
        api
          .deleteRecord(id)
          .then(() => this.reload())
          .catch((err) => toastErr(err, '删除失败'));
      },
    });
  },
  onShareAppMessage() {
    return { title: '养宠一个月花了多少？', path: '/pages/expense/expense' };
  },
});