/**
 * Licensed to jclouds, Inc. (jclouds) under one or more
 * contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  jclouds 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.gogrid.binders;

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkState;
import static org.jclouds.gogrid.reference.GoGridQueryParams.REAL_IP_LIST_KEY;

import java.util.List;

import javax.inject.Inject;
import javax.inject.Provider;
import javax.ws.rs.core.UriBuilder;

import org.jclouds.gogrid.domain.IpPortPair;
import org.jclouds.http.HttpRequest;
import org.jclouds.http.utils.ModifyRequest;
import org.jclouds.rest.Binder;

/**
 * Binds a list of real IPs to the request.
 * 
 * The {@link IpPortPair pairs} must have a {@link IpPortPair#ip} set with a valid IP address.
 * 
 * @author Oleksiy Yarmula
 */
public class BindRealIpPortPairsToQueryParams implements Binder {
   private final Provider<UriBuilder> builder;

   @Inject
   BindRealIpPortPairsToQueryParams(Provider<UriBuilder> builder) {
      this.builder = builder;
   }

   @SuppressWarnings( { "unchecked" })
   @Override
   public <R extends HttpRequest> R bindToRequest(R request, Object input) {
      checkArgument(checkNotNull(input, "input is null") instanceof List,
               "this binder is only valid for a List argument");

      List<IpPortPair> ipPortPairs = (List<IpPortPair>) input;

      int i = 0;
      for (IpPortPair ipPortPair : ipPortPairs) {
         checkNotNull(ipPortPair.getIp(), "There must be an IP address defined");
         checkNotNull(ipPortPair.getIp().getIp(),
                  "There must be an IP address defined in Ip object");
         checkState(ipPortPair.getPort() > 0, "The port number must be a positive integer");

         request = ModifyRequest.addQueryParam(request, REAL_IP_LIST_KEY + i + ".ip", ipPortPair.getIp().getIp(), builder
                  .get());
         request = ModifyRequest.addQueryParam(request, REAL_IP_LIST_KEY + i + ".port", String.valueOf(ipPortPair
                  .getPort()), builder.get());
         i++;
      }
      return request;
   }
}
