/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */

package org.apache.nifi.processors.aws.s3;

import com.amazonaws.ClientConfiguration;
import com.amazonaws.auth.AWSCredentialsProvider;
import com.amazonaws.services.s3.AmazonS3Client;
import com.amazonaws.services.s3.model.AmazonS3Exception;
import com.amazonaws.services.s3.model.CopyObjectRequest;
import com.amazonaws.services.s3.model.GetObjectMetadataRequest;
import com.amazonaws.services.s3.model.ObjectMetadata;
import org.apache.nifi.processor.ProcessContext;
import org.apache.nifi.provenance.ProvenanceEventRecord;
import org.apache.nifi.util.TestRunner;
import org.apache.nifi.util.TestRunners;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Test;

import java.nio.charset.StandardCharsets;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.mockito.ArgumentMatchers.any;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;

public class TestCopyS3Object {
    private TestRunner runner;

    private AmazonS3Client mockS3Client;

    @BeforeEach
    void setUp() {
        mockS3Client = mock(AmazonS3Client.class);
        final CopyS3Object mockCopyS3Object = new CopyS3Object() {
            @Override
            protected AmazonS3Client createClient(final ProcessContext context, final AWSCredentialsProvider credentialsProvider, final ClientConfiguration config) {
                ObjectMetadata metadata = mock(ObjectMetadata.class);

                when(metadata.getContentLength()).thenReturn(1000L);
                when(mockS3Client.getObjectMetadata(any(GetObjectMetadataRequest.class)))
                        .thenReturn(metadata);

                return mockS3Client;
            }
        };
        runner = TestRunners.newTestRunner(mockCopyS3Object);
        AuthUtils.enableAccessKey(runner, "accessKeyId", "secretKey");
    }

    @DisplayName("Test a normal run that SHOULD succeed")
    @Test
    void testRun() {
        runner.enqueue("".getBytes(StandardCharsets.UTF_8), setupRun());
        runner.run();

        runner.assertTransferCount(CopyS3Object.REL_SUCCESS, 1);

        verify(mockS3Client, times(1))
                .copyObject(any(CopyObjectRequest.class));

        final List<ProvenanceEventRecord> provenanceEvents = runner.getProvenanceEvents();
        assertEquals(1, provenanceEvents.size());
    }

    @DisplayName("Validate that S3 errors cleanly route to failure")
    @Test
    void testS3ErrorHandling() {
        final AmazonS3Exception exception = new AmazonS3Exception("Manually triggered error");
        exception.setStatusCode(503);
        when(mockS3Client.copyObject(any(CopyObjectRequest.class)))
                .thenThrow(exception);

        runner.enqueue(new byte[]{}, setupRun());
        runner.run();

        runner.assertTransferCount(CopyS3Object.REL_FAILURE, 1);
    }

    private Map<String, String> setupRun() {
        runner.setProperty(CopyS3Object.SOURCE_BUCKET, "${s3.bucket.source}");
        runner.setProperty(CopyS3Object.SOURCE_KEY, "${s3.key.source}");
        runner.setProperty(CopyS3Object.DESTINATION_BUCKET, "${s3.bucket.target}");
        runner.setProperty(CopyS3Object.DESTINATION_KEY, "${s3.key.target}");

        Map<String, String> attrs = new HashMap<>();
        attrs.put("s3.bucket.source", "dev-bucket");
        attrs.put("s3.key.source", "/test.txt");
        attrs.put("s3.bucket.target", "staging-bucket");
        attrs.put("s3.key.target", "/copied.txt");
        return attrs;
    }
}
