const recorder = require('node-record-lpcm16');

// Imports the Google Cloud client library
const speech = require('@google-cloud/speech');


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

/**
 * TODO(developer): Uncomment the following lines before running the sample.
 */
const encoding = 'LINEAR16';
const sampleRateHertz = 16000;
const languageCode = 'ko-KR';
const speechContexts = [{
  phrases: [
    '$OOV_CLASS_ALPHA_SEQUENCE 는 $OOV_CLASS_ALPHA_SEQUENCE', '$OOV_CLASS_ALPHA_SEQUENCE 는 $OOV_CLASS_DIGIT_SEQUENCE',
    '$OOV_CLASS_ALPHA_SEQUENCE 는 $OOV_CLASS_ALPHA_SEQUENCE 보다 크다',
    '$OOV_CLASS_ALPHA_SEQUENCE 는 $OOV_CLASS_ALPHA_SEQUENCE 보다 작다',
    '$OOV_CLASS_ALPHA_SEQUENCE 는 $OOV_CLASS_DIGIT_SEQUENCE 보다 크다',
    '$OOV_CLASS_ALPHA_SEQUENCE 는 $OOV_CLASS_DIGIT_SEQUENCE 보다 작다',
    'for OOV_CLASS_ALPHA_SEQUENCE in range $OOV_CLASS_DIGIT_SEQUENCE',
    'if',
    '이프',
    'else if',
    '엘스 이프',
    'else',
    '엘스',
    'while',
    '와일',
    '함수',
    '파라미터',
    'parameter',
    '변수 선언',
    '함수 선언',
    '반복문 선언',
    '조건문 선언'
  ],
  boost: 20
}]

const request = {
  config: {
    encoding: encoding,
    sampleRateHertz: sampleRateHertz,
    languageCode: languageCode,
    alternativeLanguageCodes: ['en-US'],
    speechContexts: speechContexts
  },
  interimResults: false, // If you want interim results, set this to true
};

// Create a recognize stream
const recognizeStream = client
  .streamingRecognize(request)
  .on('error', console.error)
  .on('data', data =>
    process.stdout.write(
      data.results[0] && data.results[0].alternatives[0]
        ? `Transcription: ${data.results[0].alternatives[0].transcript}\n`
        : '\n\nReached transcription time limit, press Ctrl+C\n'
    )
  );

// Start recording and send the microphone input to the Speech API.
// Ensure SoX is installed, see https://www.npmjs.com/package/node-record-lpcm16#dependencies
recorder
  .record({
    sampleRateHertz: sampleRateHertz,
    threshold: 0,
    // Other options, see https://www.npmjs.com/package/node-record-lpcm16#options
    verbose: false,
    recordProgram: 'sox', // Try also "arecord" or "sox"
    silence: '1.0',
  })
  .stream()
  .on('error', console.error)
  .pipe(recognizeStream);

console.log('Listening, press Ctrl+C to stop.');