/*

Written by Amit Agarwal
email: amit@labnol.org
web: https://digitalinspiration.com
twitter: @labnol

*/

// Get the service account private keys from Google Drive
function getServiceAccountKeys() {
  var fileLink = 'https://drive.google.com/open?id=ctrlq....';
  var fileId = fileLink.match(/[\w-]{25,}/)[0];
  var content = DriveApp.getFileById(fileId).getAs('application/json').getDataAsString();
  return JSON.parse(content);
}

// Create the Google service
function getGoogleCloudService() {
  var privateKeys = getServiceAccountKeys();
  return (
    OAuth2.createService('GoogleCloud:' + Session.getActiveUser().getEmail())
      // Set the endpoint URL.
      .setTokenUrl('https://accounts.google.com/o/oauth2/token')
      // Set the private key and issuer.
      .setPrivateKey(privateKeys['private_key'])
      .setIssuer(privateKeys['client_email'])
      // Set the property store where authorized tokens should be persisted.
      .setPropertyStore(PropertiesService.getScriptProperties())
      // Set the scope.
      .setScope('https://www.googleapis.com/auth/cloud-platform')
  );
}

// Initialize an async speech recognition job
function createRecognitionJob() {
  var service = getGoogleCloudService();
  if (service.hasAccess()) {
    var accessToken = service.getAccessToken();
    var url = 'https://speech.googleapis.com/v1/speech:longrunningrecognize';
    var payload = {
      config: {
        languageCode: 'en-US',
      },
      audio: {
        uri: 'gs://gcs-test-data/vr.flac',
      },
    };
    var response = UrlFetchApp.fetch(url, {
      method: 'POST',
      headers: {
        Authorization: 'Bearer ' + accessToken,
      },
      contentType: 'application/json',
      payload: JSON.stringify(payload),
    });
    var result = JSON.parse(response.getContentText());
    Utilities.sleep(30 * 1000);
    getTranscript(result.name, accessToken);
  }
}

// Print the speech transcript to the console
function getTranscript(name, accessToken) {
  var url = 'https://speech.googleapis.com/v1/operations/' + name;
  var response = UrlFetchApp.fetch(url, {
    method: 'GET',
    headers: {
      Authorization: 'Bearer ' + accessToken,
    },
  });
  var result = JSON.parse(response.getContentText());
  Logger.log(JSON.stringify(result, null, 2));
}