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

// 与 getNotifications 配套：把"已读截止时间"写到用户文档上，
// 之后凡是早于该时间的通知都视为已读
exports.main = async (event, context) => {
  const { OPENID } = cloud.getWXContext()

  try {
    await db.collection('users')
      .where({ openid: OPENID })
      .update({ data: { lastReadNotificationsAt: db.serverDate() } })

    return { code: 0, data: null }
  } catch (e) {
    return { code: -1, message: e.message }
  }
}