// snippet-sourcedescription:[rekognition-image-java-detect-faces.java demonstrates how to detect faces in an image loaded from an S3 Bucket.]
// snippet-service:[rekognition]
// snippet-keyword:[Java]
// snippet-sourcesyntax:[java]
// snippet-keyword:[Amazon Rekognition]
// snippet-keyword:[Code Sample]
// snippet-keyword:[DetectFaces]
// snippet-keyword:[S3 Bucket]
// snippet-keyword:[Image]
// snippet-sourcetype:[full-example]
// snippet-sourcedate:[2019-01-18]
// snippet-sourceauthor:[reesch(AWS)]
// snippet-start:[rekognition.java.rekognition-image-java-detect-faces.complete]

/**
 * Copyright 2010-2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * This file is licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License. A copy of
 * the License is located at
 *
 * http://aws.amazon.com/apache2.0/
 *
 * This file 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.
*/

package aws.example.rekognition.image;

import com.amazonaws.services.rekognition.AmazonRekognition;
import com.amazonaws.services.rekognition.AmazonRekognitionClientBuilder;
import com.amazonaws.services.rekognition.model.AmazonRekognitionException;
import com.amazonaws.services.rekognition.model.Image;
import com.amazonaws.services.rekognition.model.S3Object;
import com.amazonaws.services.rekognition.model.AgeRange;
import com.amazonaws.services.rekognition.model.Attribute;
import com.amazonaws.services.rekognition.model.DetectFacesRequest;
import com.amazonaws.services.rekognition.model.DetectFacesResult;
import com.amazonaws.services.rekognition.model.FaceDetail;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.util.List;


public class DetectFaces {
   
   
   public static void main(String[] args) throws Exception {
      // Change bucket to your S3 bucket that contains the image file.
      // Change photo to your image file.
      String photo = "input.jpg";
      String bucket = "bucket";

      AmazonRekognition rekognitionClient = AmazonRekognitionClientBuilder.defaultClient();


      DetectFacesRequest request = new DetectFacesRequest()
         .withImage(new Image()
            .withS3Object(new S3Object()
               .withName(photo)
               .withBucket(bucket)))
         .withAttributes(Attribute.ALL);
      // Replace Attribute.ALL with Attribute.DEFAULT to get default values.

      try {
         DetectFacesResult result = rekognitionClient.detectFaces(request);
         List < FaceDetail > faceDetails = result.getFaceDetails();

         for (FaceDetail face: faceDetails) {
            if (request.getAttributes().contains("ALL")) {
               AgeRange ageRange = face.getAgeRange();
               System.out.println("The detected face is estimated to be between "
                  + ageRange.getLow().toString() + " and " + ageRange.getHigh().toString()
                  + " years old.");
               System.out.println("Here's the complete set of attributes:");
            } else { // non-default attributes have null values.
               System.out.println("Here's the default set of attributes:");
            }

            ObjectMapper objectMapper = new ObjectMapper();
            System.out.println(objectMapper.writerWithDefaultPrettyPrinter().writeValueAsString(face));
         }

      } catch (AmazonRekognitionException e) {
         e.printStackTrace();
      }

   }

}
// snippet-end:[rekognition.java.rekognition-image-java-detect-faces.complete]