const api = require('../../utils/api');
const auth = require('../../utils/auth');

const STATUSES = ['正常', '迟到', '请假', '不参加讨论', '早退'];
const WEEKDAYS = ['周日', '周一', '周二', '周三', '周四', '周五', '周六'];
const STATUS_META = {
  正常: '#2E7D32',
  迟到: '#C67B30',
  请假: '#3A7BD5',
  早退: '#8B7A6A',
  '不参加讨论': '#C0392B'
};
const STATUS_ITEMS = STATUSES.map((label) => ({
  label,
  color: STATUS_META[label] || '#C67B30'
}));

function errMessage(err) {
  if (err && typeof err === 'object') {
    if (err.detail) return String(err.detail);
    if (err.error) return String(err.error);
    if (err.message) return err.message;
  }
  return '';
}

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

function fmtTime(ts) {
  if (!ts) return '';
  const d = new Date(String(ts).replace(' ', 'T'));
  if (isNaN(d.getTime())) return String(ts);
  const now = new Date();
  const startOfDay = (x) => new Date(x.getFullYear(), x.getMonth(), x.getDate()).getTime();
  const diff = Math.round((startOfDay(now) - startOfDay(d)) / 86400000);
  const hm = pad2(d.getHours()) + ':' + pad2(d.getMinutes());
  if (diff === 0) return '今天 ' + hm;
  if (diff === 1) return '昨天 ' + hm;
  return pad2(d.getMonth() + 1) + '-' + pad2(d.getDate()) + ' ' + hm;
}

Page({
  data: {
    statuses: STATUSES,
    statusItems: STATUS_ITEMS,
    statusIndex: -1,
    loading: true,
    classDate: '',
    weekday: '',
    dayNum: '',
    checked: false,
    record: null,
    statusColor: '',
    statusBg: '',
    history: [],
    group: [],
    groupName: '',
    checkedCount: 0,
    total: 0,
    tab: 'group',
    submitting: false,
    refreshing: false,
    loadError: '',
  },

  onShow() {
    this.loadPage();
  },

  onPullDownRefresh() {
    this.loadPage().then(() => wx.stopPullDownRefresh());
  },

  loadPage() {
    this.setData({ loadError: '' });
    return auth.ensureLogin()
      .then((token) => {
        if (!token) {
          wx.switchTab({ url: '/pages/profile/profile' });
          return;
        }
        return this.loadWeek();
      })
      .catch((err) => {
        const msg = (err && (err.error || err.detail || err.message)) || '加载失败，请重试';
        this.setData({ loading: false, loadError: msg });
        wx.showToast({ title: msg, icon: 'none' });
      });
  },

  onRetry() {
    this.loadPage();
  },

  loadWeek() {
    this.setData({ loading: true });
    return api.request({ url: '/api/v1/checkin/week' }).then((res) => {
      const classDate = res.class_date || '';
      const weekday = WEEKDAYS[new Date(classDate + 'T00:00:00').getDay()] || '';
      const dayNum = classDate.split('-')[2] || '';
      const statusIndex = res.record && res.record.status
        ? Math.max(0, STATUSES.indexOf(res.record.status))
        : -1;
      const statusColor = res.record ? (STATUS_META[res.record.status] || '#C67B30') : '';
      this.setData({
        classDate,
        weekday,
        dayNum,
        checked: !!res.checked,
        record: res.record || null,
        statusIndex,
        statusColor,
        statusBg: statusColor ? statusColor + '1A' : ''
      });
      return this.loadGroup();
    }).then(() => {
      this.setData({ loading: false });
    }).catch(() => {
      this.setData({ loading: false });
    });
  },

  loadGroup() {
    const data = this.data.classDate ? { class_date: this.data.classDate } : {};
    return api.request({ url: '/api/v1/checkin/group', data }).then((res) => {
      const members = (res.members || []).map((m) => ({
        ...m,
        shortName: (m.name || '?').charAt(0),
        timeText: m.checked && m.record ? fmtTime(m.record.checked_at) : ''
      }));
      const checkedCount = members.filter((m) => m.checked).length;
      this.setData({
        group: members,
        groupName: res.group_name || '',
        checkedCount,
        total: members.length
      });
    }).catch(() => {});
  },

  loadHistory() {
    return api.request({ url: '/api/v1/checkin/list', data: { page: 1, size: 20 } }).then((res) => {
      const history = (res.list || []).map((item) => {
        const color = STATUS_META[item.status] || '#C67B30';
        return {
          ...item,
          timeText: fmtTime(item.checked_at),
          color,
          bg: color + '1A'
        };
      });
      this.setData({ history });
    }).catch(() => {});
  },

  onStatusTap(e) {
    if (this.data.submitting) {
      return;
    }
    const statusIndex = Number(e.currentTarget.dataset.index);
    const status = STATUSES[statusIndex];
    if (!status) {
      return;
    }
    const prevIndex = this.data.statusIndex;
    this.setData({ statusIndex, submitting: true });
    api.request({
      url: '/api/v1/checkin',
      method: 'POST',
      data: {
        status,
        class_date: this.data.classDate,
        course_type: '会员课程'
      }
    }).then((res) => {
      const record = res.record || null;
      const statusColor = record ? (STATUS_META[record.status] || '#C67B30') : '';
      this.setData({ submitting: false, checked: true, record, statusColor, statusBg: statusColor ? statusColor + '1A' : '' });
      wx.showToast({ title: '打卡成功', icon: 'success' });
      this.loadGroup();
      if (this.data.tab === 'personal') {
        this.loadHistory();
      }
    }).catch((err) => {
      this.setData({ submitting: false, statusIndex: prevIndex });
      wx.showToast({ title: errMessage(err) || '打卡失败', icon: 'none' });
    });
  },

  switchTab(e) {
    const tab = e.currentTarget.dataset.tab;
    if (tab !== 'group' && tab !== 'personal') {
      return;
    }
    this.setData({ tab });
    if (tab === 'personal') {
      this.loadHistory();
    }
  },


  onRefresh() {
    this.setData({ refreshing: true });
    const task = this.data.tab === 'group' ? this.loadWeek() : this.loadHistory();
    Promise.resolve(task).then(() => {
      this.setData({ refreshing: false });
    });
  }
});