const speech = require('@google-cloud/speech');

// Creates a client
const client = new speech.SpeechClient();

const encoding = 'LINEAR16';
const sampleRateHertz = 16000;
const languageCode = 'en-US';

const config = {
  encoding: encoding,
  sampleRateHertz: sampleRateHertz,
  languageCode: languageCode,
};

/**
 * Note that transcription is limited to 60 seconds audio.
 * Use a GCS file for audio longer than 1 minute.
 */
async function transcribeSpeech (audio) {
  const request = {
    config: config,
    audio: audio,
  };

  // Detects speech in the audio file. This creates a recognition job that you
  // can wait for now, or get its result later.
  const [operation] = await client.longRunningRecognize(request);

  // Get a Promise representation of the final result of the job
  const [response] = await operation.promise();

  const transcription = response.results
    .map(result => result.alternatives[0].transcript)
    .join('\n');
  console.log(`Transcription: ${transcription}`);
}