// firebase
initializeApp({
  credential: cert({
    type: process.env.FB_CERT_CREDENTIAL_TYPE,
    project_id: process.env.FB_CERT_PROJECT_ID,
    private_key_id: process.env.FB_CERT_PRIVATE_KEY_ID,
    private_key: process.env.FB_CERT_PRIVATE_KEY.replace(/\\n/g, '\n'),
    client_email: process.env.FB_CERT_CLIENT_EMAIL,
    client_id: process.env.FB_CERT_CLIENT_ID,
    auth_uri: process.env.FB_CERT_AUTH_URI,
    token_uri: process.env.FB_CERT_TOKEN_URI,
    auth_provider_x509_cert_url: process.env.FB_CERT_AUTH_PROVIDER_CERT_URL,
    client_x509_cert_url: process.env.FB_CERT_CLIENT_CERT_URL,
    universe_domain: process.env.FB_CERT_UNIVERSE_DOMAIN
  }),
  storageBucket: 'palate-d1218.appspot.com'
});

const base64EncodedServiceAccount = process.env.CLOUD_CREDENTIALS;
const decodedServiceAccount = Buffer.from(base64EncodedServiceAccount, 'base64').toString('utf-8');
const credentials = JSON.parse(decodedServiceAccount);

// google cloud storage
const gCloudStorage = new Storage({
   projectId: `palate-d1218`,
   keyFilename: "",
   credentials: credentials
})

async function loadCredentials() {
   console.log(gCloudStorage.authClient)
   try {
      const [buckets] = await gCloudStorage.getBuckets();
      console.log(`buckets: `)
      for (const bucket of buckets) {
         console.log(` - ${bucket.name}`)
      }
      console.log(`listed all buckets`)
   } catch (e) {
      console.log(`error getting buckets`)
      console.log(e)
   }
   
}
loadCredentials()

module.exports.getVoices = async (req, res) => {
   const languageCode = 'en';
   const textToSpeech = require("@google-cloud/text-to-speech");
   const googleTextToSpeechClient = new textToSpeech.TextToSpeechClient();
   try {
      const [result] = await googleTextToSpeechClient.listVoices({ languageCode })
      res.send(result);
   } catch (e) {
      console.log(e);
      res.status(400).send(e);
   }
}

module.exports.transcribeTextFunction = async (palate) => {
   const { id, title, text } = palate
   const googleTextToSpeechClient = new TextToSpeechLongAudioSynthesizeClient()
   const bucketName = "gs://palate-d1218.appspot.com/"
   const gsUtilUriPath = `${bucketName}${title}.wav`

   try {
      const request = {
         input: { 
            text: text
         },
         audioConfig: {
            audioEncoding: `LINEAR16`
         },
         voice: {
            languageCode: 'en-US',
            name: 'en-US-Neural2-D',
            // ssmlGender: 'NEUTRAL',
         }, 
         parent: `projects/928931080353/locations/us`,
         outputGcsUri: gsUtilUriPath
      };
      const response = await googleTextToSpeechClient.synthesizeLongAudio(request);
      return response
   } catch (e) {
      console.log(`error transcribing text`)
      console.log(e);
      return `failed to transcribe text: ${e}`
   }
}

Error: Could not load the default credentials. Browse to https://cloud.google.com/docs/authentication/getting-started for more information.
    at GoogleAuth.getApplicationDefaultAsync (/Users/idodekerobo/Documents/gCloudApp/node_modules/@google-cloud/text-to-speech/node_modules/google-auth-library/build/src/auth/googleauth.js:207:19)
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
    at async GoogleAuth.getClient (/Users/idodekerobo/Documents/gCloudApp/node_modules/@google-cloud/text-to-speech/node_modules/google-auth-library/build/src/auth/googleauth.js:624:17)
    at async GrpcClient._getCredentials (/Users/idodekerobo/Documents/gCloudApp/node_modules/@google-cloud/text-to-speech/node_modules/google-gax/build/src/grpc.js:145:24)
    at async GrpcClient.createStub (/Users/idodekerobo/Documents/gCloudApp/node_modules/@google-cloud/text-to-speech/node_modules/google-gax/build/src/grpc.js:308:23)
(node:95143) MetadataLookupWarning: received unexpected error = Invalid response from metadata service: incorrect Metadata-Flavor header. code = UNKNOWN
(Use `node --trace-warnings ...` to show where the warning was created)