// 云函数入口文件
const cloud = require('wx-server-sdk')

cloud.init()
const db = cloud.database()

// 云函数入口函数
exports.main = async (event, context) => {
  const {
    OPENID
  } = cloud.getWXContext()

  const question_check = await db.collection('question')
    .where({
      _id: event.que_id || ''
    })
    .get()
  if (question_check.data.length === 0) {
    return {
      errMsg: '提问不存在',
      status: 'ERR'
    }
  }

  const manager_check = await db.collection('question')
    .aggregate()
    .match({
      _id: event.que_id
    })
    .lookup({
      from: 'message',
      localField: 'msg_id',
      foreignField: '_id',
      as: 'message'
    })
    .unwind('$message')
    .lookup({
      from: 'manager',
      localField: 'message.pub_id',
      foreignField: 'pub_id',
      as: 'manager'
    })
    .unwind('$manager')
    .match({
      'manager.user_id': OPENID
    })
    .end()
  if (manager_check.list.length === 0) {
    return {
      errMsg: '只有管理员可以修改',
      status: 'ERR'
    }
  }

  if (event.answer) {
    const question = await db.collection('question')
      .doc(event.que_id)
      .update({
        data: {
          answer: event.answer,
          a_time: new Date()
        }
      })

    const notification = await db.collection('question')
      .doc(event.que_id)
      .get()
    await db.collection('notification')
      .add({
        data: {
          user_id: notification.data.user_id,
          msg_id: notification.data.msg_id,
          type: '回复',
          content: event.answer || '',
          notify_time: new Date()
        }
      })

    return {
      stats: question.stats,
      status: 'OK'
    }
  } else if (event.rank) {
    const question = await db.collection('question')
      .doc(event.que_id)
      .update({
        data: {
          rank: event.rank
        }
      })

    return {
      stats: question.stats,
      status: 'OK'
    }
  }

  return {
    errMsg: '未知操作',
    status: 'ERR'
  }
}