const cloud = require('wx-server-sdk')
cloud.init({ env: cloud.DYNAMIC_CURRENT_ENV })
const db = cloud.database()

exports.main = async (event, context) => {
  const wxContext = cloud.getWXContext()
  const openid = wxContext.OPENID

  if (event.action === 'login') {
    let userRecord = await db.collection('users').where({ openid }).get()

    if (userRecord.data.length === 0) {
      const newUser = {
        openid,
        nickname: '',
        avatar_url: '',
        phone: '',
        gender: 0,
        created_at: db.serverDate()
      }
      await db.collection('users').add({ data: newUser })
      userRecord = await db.collection('users').where({ openid }).get()
    }

    const user = userRecord.data[0]
    return {
      code: 0,
      data: {
        token: openid + '_' + Date.now(),
        user_id: user._id,
        user_info: {
          user_id: user._id,
          nickname: user.nickname || '用户' + openid.slice(-4),
          avatar_url: user.avatar_url || '',
          phone: user.phone || '',
          gender: user.gender || 0
        }
      }
    }
  }

  if (event.action === 'refresh') {
    const userRecord = await db.collection('users').where({ openid }).get()
    if (userRecord.data.length === 0) {
      return { code: 1001, message: '用户不存在' }
    }
    return { code: 0, data: { token: openid + '_' + Date.now() } }
  }

  return { code: -1, message: '未知操作' }
}