package org.xmlsh.aws;

import java.io.IOException;
import java.util.List;
import javax.xml.stream.XMLStreamException;
import org.xmlsh.aws.util.AWSEC2Command;
import org.xmlsh.core.CoreException;
import org.xmlsh.core.Options;
import org.xmlsh.core.SafeXMLStreamWriter;
import org.xmlsh.core.UnexpectedException;
import org.xmlsh.core.XValue;
import org.xmlsh.core.io.OutputPort;
import org.xmlsh.util.Util;
import com.amazonaws.AmazonServiceException;
import com.amazonaws.services.ec2.model.DescribeVolumesRequest;
import com.amazonaws.services.ec2.model.DescribeVolumesResult;
import com.amazonaws.services.ec2.model.Volume;
import net.sf.saxon.s9api.SaxonApiException;

public class ec2DescribeVolumes extends AWSEC2Command {

  /**
   * @param args
   * @throws IOException
   */
  @Override
  public int run(List<XValue> args) throws Exception {

    Options opts = getOptions();
    parseOptions(opts, args);

    args = opts.getRemainingArgs();
    parseCommonOptions(opts);

    setSerializeOpts(this.getSerializeOpts(opts));

    try {
      getEC2Client(opts);
    } catch (UnexpectedException e) {
      usage(e.getLocalizedMessage());
      return 1;
    }

    int ret;
    switch(args.size()){
    case 0:
      ret = describe(null);
      break;
    default:
      ret = describe(args);
      break;
    }

    return ret;
  }

  private int describe(List<XValue> args)
      throws IOException, XMLStreamException, SaxonApiException, CoreException,
      InterruptedException {
    OutputPort stdout = this.getStdout();
    mWriter = new SafeXMLStreamWriter(
        stdout.asXMLStreamWriter(getSerializeOpts()));
    startDocument();
    startElement(this.getName());

    DescribeVolumesRequest request = new DescribeVolumesRequest();
    ;
    if(args != null) {
      request.setVolumeIds(Util.toStringList(args));

    }
    DescribeVolumesResult result = null;

    int retry = rateRetry;
    int delay = retryDelay;
    do {
      try {

        result = getAWSClient().describeVolumes(request);
        break;
      } catch (AmazonServiceException e) {
        mShell.printErr("AmazonServiceException", e);
        if(retry > 0
            && Util.isEqual("RequestLimitExceeded", e.getErrorCode())) {
          mShell.printErr("AWS RequestLimitExceeded - sleeping " + delay);
          Thread.sleep(delay);
          retry--;
          delay *= 2;
        }
        else
          throw e;
      }
    } while(retry > 0);

    if(args != null) {
      request.setVolumeIds(Util.toStringList(args));

    }

    traceCall("describeVolumes");

    for(Volume volume : result.getVolumes()) {
      writeVolume(volume);
      endElement();
    }

    endElement();
    endDocument();
    closeWriter();

    stdout.writeSequenceTerminator(getSerializeOpts());

    return 0;

  }

}