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/*
 * Licensed to Metamarkets Group Inc. (Metamarkets) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. Metamarkets 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 io.druid.storage.s3;

import com.google.common.base.Predicate;
import com.google.common.base.Throwables;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Maps;
import com.google.inject.Inject;
import com.metamx.common.ISE;
import com.metamx.common.MapUtils;
import com.metamx.common.logger.Logger;
import io.druid.segment.loading.DataSegmentMover;
import io.druid.segment.loading.SegmentLoadingException;
import io.druid.timeline.DataSegment;
import org.jets3t.service.ServiceException;
import org.jets3t.service.acl.gs.GSAccessControlList;
import org.jets3t.service.impl.rest.httpclient.RestS3Service;
import org.jets3t.service.model.S3Object;

import java.util.Map;
import java.util.concurrent.Callable;

public class S3DataSegmentMover implements DataSegmentMover
{
  private static final Logger log = new Logger(S3DataSegmentMover.class);

  private final RestS3Service s3Client;
  private final S3DataSegmentPusherConfig config;

  @Inject
  public S3DataSegmentMover(
      RestS3Service s3Client,
      S3DataSegmentPusherConfig config
  )
  {
    this.s3Client = s3Client;
    this.config = config;
  }

  @Override
  public DataSegment move(DataSegment segment, Map targetLoadSpec) throws SegmentLoadingException
  {
    try {
      Map loadSpec = segment.getLoadSpec();
      String s3Bucket = MapUtils.getString(loadSpec, "bucket");
      String s3Path = MapUtils.getString(loadSpec, "key");
      String s3DescriptorPath = S3Utils.descriptorPathForSegmentPath(s3Path);

      final String targetS3Bucket = MapUtils.getString(targetLoadSpec, "bucket");
      final String targetS3BaseKey = MapUtils.getString(targetLoadSpec, "baseKey");

      final String targetS3Path = S3Utils.constructSegmentPath(targetS3BaseKey, segment);
      String targetS3DescriptorPath = S3Utils.descriptorPathForSegmentPath(targetS3Path);

      if (targetS3Bucket.isEmpty()) {
        throw new SegmentLoadingException("Target S3 bucket is not specified");
      }
      if (targetS3Path.isEmpty()) {
        throw new SegmentLoadingException("Target S3 baseKey is not specified");
      }

      safeMove(s3Bucket, s3Path, targetS3Bucket, targetS3Path);
      safeMove(s3Bucket, s3DescriptorPath, targetS3Bucket, targetS3DescriptorPath);

      return segment.withLoadSpec(
          ImmutableMap.builder()
                      .putAll(
                          Maps.filterKeys(
                              loadSpec, new Predicate()
                          {
                            @Override
                            public boolean apply(String input)
                            {
                              return !(input.equals("bucket") || input.equals("key"));
                            }
                          }
                          )
                      )
                      .put("bucket", targetS3Bucket)
                      .put("key", targetS3Path)
                      .build()
      );
    }
    catch (ServiceException e) {
      throw new SegmentLoadingException(e, "Unable to move segment[%s]: [%s]", segment.getIdentifier(), e);
    }
  }

  private void safeMove(
      final String s3Bucket,
      final String s3Path,
      final String targetS3Bucket,
      final String targetS3Path
  ) throws ServiceException, SegmentLoadingException
  {
    try {
      S3Utils.retryS3Operation(
          new Callable()
          {
            @Override
            public Void call() throws Exception
            {
              if (s3Client.isObjectInBucket(s3Bucket, s3Path)) {
                if (s3Bucket.equals(targetS3Bucket) && s3Path.equals(targetS3Path)) {
                  log.info("No need to move file[s3://%s/%s] onto itself", s3Bucket, s3Path);
                } else {
                  final S3Object[] list = s3Client.listObjects(s3Bucket, s3Path, "");
                  if (list.length == 0) {
                    // should never happen
                    throw new ISE("Unable to list object [s3://%s/%s]", s3Bucket, s3Path);
                  }
                  final S3Object s3Object = list[0];
                  if (s3Object.getStorageClass() != null &&
                      s3Object.getStorageClass().equals(S3Object.STORAGE_CLASS_GLACIER)) {
                    log.warn("Cannot move file[s3://%s/%s] of storage class glacier, skipping.", s3Bucket, s3Path);
                  } else {
                    log.info(
                        "Moving file[s3://%s/%s] to [s3://%s/%s]",
                        s3Bucket,
                        s3Path,
                        targetS3Bucket,
                        targetS3Path
                    );
                    final S3Object target = new S3Object(targetS3Path);
                    if (!config.getDisableAcl()) {
                      target.setAcl(GSAccessControlList.REST_CANNED_BUCKET_OWNER_FULL_CONTROL);
                    }
                    s3Client.moveObject(s3Bucket, s3Path, targetS3Bucket, target, false);
                  }
                }
              } else {
                // ensure object exists in target location
                if (s3Client.isObjectInBucket(targetS3Bucket, targetS3Path)) {
                  log.info(
                      "Not moving file [s3://%s/%s], already present in target location [s3://%s/%s]",
                      s3Bucket, s3Path,
                      targetS3Bucket, targetS3Path
                  );
                } else {
                  throw new SegmentLoadingException(
                      "Unable to move file [s3://%s/%s] to [s3://%s/%s], not present in either source or target location",
                      s3Bucket, s3Path,
                      targetS3Bucket, targetS3Path
                  );
                }
              }
              return null;
            }
          }
      );
    }
    catch (Exception e) {
      Throwables.propagateIfInstanceOf(e, ServiceException.class);
      Throwables.propagateIfInstanceOf(e, SegmentLoadingException.class);
      throw Throwables.propagate(e);
    }
  }
}