const { checkAuth, listSessions } = require('../../utils/api');
const { SELECTED_SESSION_KEY } = require('../../utils/config');

function formatTime(value) {
  const timestamp = Number(value || 0);
  if (!timestamp) return '';
  const date = new Date(timestamp < 10_000_000_000 ? timestamp * 1000 : timestamp);
  return `${date.getMonth() + 1}/${date.getDate()} ${String(date.getHours()).padStart(2, '0')}:${String(date.getMinutes()).padStart(2, '0')}`;
}

Page({
  data: {
    sessions: [],
    loading: false,
    error: ''
  },

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

  async ensureAndLoad() {
    try {
      const status = await checkAuth();
      if (!status?.authenticated) {
        wx.redirectTo({ url: '/pages/login/index' });
        return;
      }
      await this.loadSessions();
    } catch {
      wx.redirectTo({ url: '/pages/login/index' });
    }
  },

  async loadSessions() {
    this.setData({ loading: true, error: '' });
    try {
      const result = await listSessions({ limit: 30 });
      const rows = result?.sessions || result?.data || result?.items || [];
      this.setData({
        sessions: rows.map((item) => ({
          ...item,
          id: item.id || item.sessionId,
          updatedAtText: formatTime(item.updatedAt || item.updated_at || item.created || item.createdAt)
        }))
      });
    } catch (error) {
      this.setData({ error: error?.message || '会话加载失败' });
    } finally {
      this.setData({ loading: false });
    }
  },

  openSession(event) {
    const id = event.currentTarget.dataset.id;
    if (!id) return;
    wx.setStorageSync(SELECTED_SESSION_KEY, id);
    wx.switchTab({ url: '/pages/chat/index' });
  }
});