/*
    * Copyright (c) 2016 ingenieux Labs
    *
    * 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 br.com.ingenieux.mojo.beanstalk.env;
  
  import com.amazonaws.services.ec2.AmazonEC2;
  import com.amazonaws.services.ec2.AmazonEC2Client;
  import com.amazonaws.services.ec2.model.DescribeInstancesRequest;
  import com.amazonaws.services.ec2.model.DescribeInstancesResult;
  import com.amazonaws.services.ec2.model.Reservation;
  import com.amazonaws.services.elasticbeanstalk.model.DescribeEnvironmentResourcesRequest;
  import com.amazonaws.services.elasticbeanstalk.model.DescribeEnvironmentResourcesResult;
  import com.amazonaws.services.elasticbeanstalk.model.Instance;
  
  import org.apache.commons.lang.StringUtils;
  import org.apache.maven.plugins.annotations.Mojo;
  import org.apache.maven.plugins.annotations.Parameter;
  
  import java.io.File;
  import java.io.PrintStream;
  import java.util.ArrayList;
  import java.util.List;
  
  import br.com.ingenieux.mojo.beanstalk.AbstractNeedsEnvironmentMojo;
  
  /**
   * Dump Environment Instance Addresses
   *
   * See the docs for <a href= "http://docs.amazonwebservices.com/elasticbeanstalk/latest/api/API_DescribeEnvironmentResources.html"
   * >DescribeEnvironmentResources API</a> call.
   *
   * @author Aldrin Leal
   * @since 1.1.1
   */
  @Mojo(name = "dump-instances", requiresDirectInvocation = true)
  public class DumpInstancesMojo extends AbstractNeedsEnvironmentMojo {
  
    /**
     * (Optional) output file to output to
     */
    @Parameter(property = "beanstalk.outputFile")
    private File outputFile;
  
    /**
     * Dump private addresses? defaults to false
     */
    @Parameter(property = "beanstalk.dumpPrivateAddresses", defaultValue = "false")
    private boolean dumpPrivateAddresses;
  
    @Override
    protected Object executeInternal() throws Exception {
      AmazonEC2 ec2 = clientFactory.getService(AmazonEC2Client.class);
  
      DescribeEnvironmentResourcesResult envResources =
          getService()
              .describeEnvironmentResources(
                  new DescribeEnvironmentResourcesRequest().withEnvironmentId(curEnv.getEnvironmentId()).withEnvironmentName(curEnv.getEnvironmentName()));
      List<String> instanceIds = new ArrayList<String>();
  
      for (Instance i : envResources.getEnvironmentResources().getInstances()) {
        instanceIds.add(i.getId());
      }
  
      DescribeInstancesResult ec2Instances = ec2.describeInstances(new DescribeInstancesRequest().withInstanceIds(instanceIds));
  
      PrintStream printStream = null;
  
      if (null != outputFile) {
        printStream = new PrintStream(outputFile);
      }
  
      for (Reservation r : ec2Instances.getReservations()) {
        for (com.amazonaws.services.ec2.model.Instance i : r.getInstances()) {
          String ipAddress = dumpPrivateAddresses ? i.getPrivateIpAddress() : StringUtils.defaultString(i.getPublicIpAddress(), i.getPrivateDnsName());
          String instanceId = i.getInstanceId();
  
          if (null != printStream) {
            printStream.println(ipAddress + " # " + instanceId);
          } else {
            getLog().info(" * " + instanceId + ": " + ipAddress);
          }
        }
      }
  
      if (null != printStream) {
        printStream.close();
     }
 
     return null;
   }
 }