module.exports = function (app, opts) {
   async function getCameraLevel3ByStreamId ({ streamId, errMsg = '' }) {
      const { models } = app.fs.dc
      if (!streamId) {
         errMsg = '参数错误'
         throw errMsg
      }

      const streamIdArr = [streamId]

      const findChild = async (streamIdArr) => {
         const childRes = await models.GbCamera.findAll({
            where: {
               parent: { $in: streamIdArr },
            }
         })
         if (!childRes.length || childRes.some(c => c.level == 2)) {
            return childRes
         } else {
            const nextLevelStreamIds = childRes.map(level => level.streamid)
            return findChild(nextLevelStreamIds)
         }
      }

      const cameraRes = await findChild(streamIdArr)

      return cameraRes
   }

   return {
      getCameraLevel3ByStreamId
   }
}