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/**
 *
 * Copyright (C) 2010 Cloud Conscious, 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.
 * ====================================================================
 */

package org.jclouds.aws.s3.functions;

import static org.jclouds.blobstore.reference.BlobStoreConstants.PROPERTY_USER_METADATA_PREFIX;

import javax.inject.Inject;
import javax.inject.Named;
import javax.ws.rs.core.HttpHeaders;

import org.jclouds.aws.s3.blobstore.functions.BlobToObjectMetadata;
import org.jclouds.aws.s3.domain.MutableObjectMetadata;
import org.jclouds.blobstore.domain.BlobMetadata;
import org.jclouds.blobstore.functions.ParseSystemAndUserMetadataFromHeaders;
import org.jclouds.crypto.CryptoStreams;
import org.jclouds.http.HttpRequest;
import org.jclouds.http.HttpResponse;
import org.jclouds.rest.InvocationContext;

import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Function;

/**
 * This parses @{link {@link org.jclouds.aws.s3.domain.internal.MutableObjectMetadata} from HTTP
 * headers.
 * 
 * @see 
 * @author Adrian Cole
 */
public class ParseObjectMetadataFromHeaders implements Function, InvocationContext {
   private final ParseSystemAndUserMetadataFromHeaders blobMetadataParser;
   private final BlobToObjectMetadata blobToObjectMetadata;
   private final String userMdPrefix;

   @Inject
   public ParseObjectMetadataFromHeaders(ParseSystemAndUserMetadataFromHeaders blobMetadataParser,
            BlobToObjectMetadata blobToObjectMetadata, @Named(PROPERTY_USER_METADATA_PREFIX) String userMdPrefix) {
      this.blobMetadataParser = blobMetadataParser;
      this.blobToObjectMetadata = blobToObjectMetadata;
      this.userMdPrefix = userMdPrefix;
   }

   /**
    * parses the http response headers to create a new
    * {@link org.jclouds.aws.s3.domain.internal.MutableObjectMetadata} object.
    */
   public MutableObjectMetadata apply(HttpResponse from) {
      BlobMetadata base = blobMetadataParser.apply(from);
      MutableObjectMetadata to = blobToObjectMetadata.apply(base);
      addETagTo(from, to);
      if (to.getContentMetadata().getContentMD5() == null && to.getETag() != null) {
         byte[] md5 = CryptoStreams.hex(to.getETag().replaceAll("\"", ""));
         // it is possible others will look at the http payload directly
         from.getPayload().getContentMetadata().setContentMD5(md5);
         to.getContentMetadata().setContentMD5(md5);
      }
      to.setCacheControl(from.getFirstHeaderOrNull(HttpHeaders.CACHE_CONTROL));
      return to;
   }

   /**
    * ETag == Content-MD5
    */
   @VisibleForTesting
   protected void addETagTo(HttpResponse from, MutableObjectMetadata metadata) {
      if (metadata.getETag() == null) {
         String eTagHeader = from.getFirstHeaderOrNull(userMdPrefix + "object-eTag");
         if (eTagHeader != null) {
            metadata.setETag(eTagHeader);
         }
      }
   }

   @Override
   public ParseObjectMetadataFromHeaders setContext(HttpRequest request) {
      blobMetadataParser.setContext(request);
      return this;
   }

}