/*
 * Copyright 2017 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/*
 * EDITING INSTRUCTIONS
 * This file is referenced in READMEs. Any change to this file should be reflected in
 * the project's READMEs.
 */

package com.google.cloud.examples.speech.snippets;

import com.google.cloud.speech.v1.SpeechClient;
import com.google.cloud.speech.v1.RecognitionAudio;
import com.google.cloud.speech.v1.RecognitionConfig;
import com.google.cloud.speech.v1.RecognitionConfig.AudioEncoding;
import com.google.cloud.speech.v1.RecognizeResponse;
import com.google.cloud.speech.v1.SpeechRecognitionAlternative;
import com.google.cloud.speech.v1.SpeechRecognitionResult;
import com.google.protobuf.ByteString;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.List;

/**
 * A snippet for Google Natural Language API showing how to convert houman speech from an audio file
 * into a text form.
 */
public class RecognizeSpeech {
  public static void main(String... args) throws Exception {
    // Instantiates a client
    SpeechClient speech = SpeechClient.create();

    // The path to the audio file to transcribe
    String fileName = "your/speech/audio/file.raw"; // for example "./resources/audio.raw";

    // Reads the audio file into memory
    Path path = Paths.get(fileName);
    byte[] data = Files.readAllBytes(path);
    ByteString audioBytes = ByteString.copyFrom(data);

    // Builds the sync recognize request
    RecognitionConfig config = RecognitionConfig.newBuilder()
        .setEncoding(AudioEncoding.LINEAR16)
        .setSampleRateHertz(16000)
        .setLanguageCode("en-US")
        .build();
    RecognitionAudio audio = RecognitionAudio.newBuilder()
        .setContent(audioBytes)
        .build();

    // Performs speech recognition on the audio file
    RecognizeResponse response = speech.recognize(config, audio);
    List<SpeechRecognitionResult> results = response.getResultsList();

    for (SpeechRecognitionResult result: results) {
      List<SpeechRecognitionAlternative> alternatives = result.getAlternativesList();
      for (SpeechRecognitionAlternative alternative: alternatives) {
        System.out.printf("Transcription: %s%n", alternative.getTranscript());
      }
    }
    speech.close();
  }
}
