/*
 * 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.jclouds.aws.handlers;

import static org.jclouds.http.HttpUtils.closeClientButKeepContentStream;

import java.util.Set;

import org.jclouds.aws.domain.AWSError;
import org.jclouds.aws.util.AWSUtils;
import org.jclouds.http.HttpCommand;
import org.jclouds.http.HttpResponse;
import org.jclouds.http.annotation.ServerError;
import org.jclouds.http.handlers.BackoffLimitedRetryHandler;

import com.google.inject.Inject;
import com.google.inject.Singleton;

/**
 * Handles Retryable responses with error codes in the 5xx range
 */
@Singleton
public class AWSServerErrorRetryHandler extends BackoffLimitedRetryHandler {

   private final AWSUtils utils;
   private final Set<String> retryableServerCodes;

   @Inject
   public AWSServerErrorRetryHandler(AWSUtils utils,
         @ServerError Set<String> retryableServerCodes) {
      this.utils = utils;
      this.retryableServerCodes = retryableServerCodes;
   }

   @Override
   public boolean shouldRetryRequest(HttpCommand command, HttpResponse response) {
      switch (response.getStatusCode()) {
      case 500:  // Internal Server Error
      case 503:  // Service Unavailable
         // Content can be null in the case of HEAD requests
         if (response.getPayload() != null) {
            closeClientButKeepContentStream(response);
            AWSError error = utils.parseAWSErrorFromContent(command.getCurrentRequest(), response);
            if (error != null) {
               return shouldRetryRequestOnError(command, response, error);
            }
         }
         break;
      case 504:  // Gateway Timeout
         return super.shouldRetryRequest(command, response);
      }
      return false;
   }

   protected boolean shouldRetryRequestOnError(HttpCommand command, HttpResponse response, AWSError error) {
      if (retryableServerCodes.contains(error.getCode()))
         return super.shouldRetryRequest(command, response);
      return false;
   }

   public void imposeBackoffExponentialDelay(long period, int pow, int failureCount, int max, String commandDescription) {
      imposeBackoffExponentialDelay(period, period * 100L, pow, failureCount, max, commandDescription);
   }

   
}
