const getLineImage = ("メッセージIDです") => {
  return new Promise((resolve, reject) => {
    client.getMessageContent(id)
      .then((stream) => {
        var data = []
        stream.on('data', (chunk) => {
          data.push(new Buffer.from(chunk))
        })
        stream.on('error', (error) => {
          debug("Error: line image. " + error)
          reject(error)
        })
        stream.on('end', () => {
          debug("Success: get line image.")
          resolve(data)
        })
      })
  })
}

const AWS = require('aws-sdk')
AWS.config.region = 'リージョン'

const s3 = new AWS.S3({ apiVersion: 'xxxxxxxxxxxxx' })

// put image for s3 bucket.
// put image for s3 bucket.
const putS3 = async (data, id) => {
  debug(data)
  var params = {
    Bucket: process.env.S3_BUCKET,
    Key: "ファイル名",
    ContentType: 'ファイルフォーマット', // ここないと、webでアクセスしても表示できず、ダンロードされちゃう
    Body: Buffer.concat(data)
  }

  return await s3.putObject(params).promise()
}

// get label of images from rekognition
const getImageLabelFromRekognition = (id) => {
  return new Promise((resolve, reject) => {
    const params = {
      Image: {
        S3Object: {
          Bucket: "バケット名",
          Name: "UPした画像のファイル名",
        },
      },
      MaxLabels: 30 // 最大取得件数
    }
    rekognition.detectLabels(params).promise()
      .then((data) => {
        var list = []
        data.Labels.forEach(label => {
          list.push(label.Name)
          debug(`Label:      ${label.Name}`)
          debug(`Confidence: ${label.Confidence}`)
          debug("Instances:")
          label.Instances.forEach(instance => {
            let box = instance.BoundingBox
            debug("  Bounding box:")
            debug(`    Top:        ${box.Top}`)
            debug(`    Left:       ${box.Left}`)
            debug(`    Width:      ${box.Width}`)
            debug(`    Height:     ${box.Height}`)
            debug(`  Confidence: ${instance.Confidence}`)
          })
          debug("Parents:")
          label.Parents.forEach(parent => {
            debug(`  ${parent.Name}`)
          })
          debug("------------")
        })
        debug("success: rekognition")
        resolve(list)  // キーワードを配列で返した
      }).catch((error) => {
        debug("error: rekognition. " + error)
        reject(error)
      })
  })
}

const getTranslate = async (text) => {
  let params = {
    Text: text,
    SourceLanguageCode: 'en',
    TargetLanguageCode: 'ja',
  }
  return await translate.translateText(params).promise()
}