package org.xmlsh.aws;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.xml.stream.XMLStreamException;
import org.xmlsh.aws.util.AWSSDBCommand;
import org.xmlsh.core.CoreException;
import org.xmlsh.core.Options;
import org.xmlsh.core.UnexpectedException;
import org.xmlsh.core.XValue;
import org.xmlsh.core.io.OutputPort;
import org.xmlsh.util.Util;
import com.amazonaws.services.simpledb.model.Attribute;
import com.amazonaws.services.simpledb.model.DeleteAttributesRequest;
import com.amazonaws.services.simpledb.model.UpdateCondition;
import net.sf.saxon.s9api.SaxonApiException;

public class sdbDeleteAttributes extends AWSSDBCommand {

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

    Options opts = getOptions("update:,exists:,q=quiet");
    parseOptions(opts, args);

    args = opts.getRemainingArgs();

    setSerializeOpts(this.getSerializeOpts(opts));

    String updateName = opts.getOptString("update", null);
    String updateExists = opts.getOptString("exists", null);

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

    }

    if(args.size() < 2) {
      usage(getName() + ":" + "domain item attributes ...");

    }
    String domain = args.remove(0).toString();
    String item = args.remove(0).toString();

    int ret = -1;
    ret = delete(domain, item, args, updateName, updateExists,
        opts.hasOpt("q"));

    return ret;

  }

  private int delete(String domain, String item, List<XValue> args,
      String updateName, String updateExists, boolean bQuiet)
      throws IOException, XMLStreamException, SaxonApiException, CoreException {

    UpdateCondition cond = null;
    if(!Util.isEmpty(updateName))
      cond = new UpdateCondition(updateName, updateExists,
          !Util.isEmpty(updateExists));

    List<Attribute> attributes = getAttributes(args);

    DeleteAttributesRequest request = new DeleteAttributesRequest(domain, item)
        .withAttributes(attributes).withExpected(cond);

    traceCall("deleteAttributes");

    getAWSClient().deleteAttributes(request);

    if(!bQuiet) {
      OutputPort stdout = this.getStdout();
      mWriter = stdout.asXMLStreamWriter(getSerializeOpts());

      emptyDocument();

      closeWriter();
      stdout.writeSequenceTerminator(getSerializeOpts());

    }

    return 0;

  }

  private List<Attribute> getAttributes(List<XValue> args) {
    List<Attribute> attrs = new ArrayList<Attribute>(args.size());
    while(!args.isEmpty()) {

      String name = args.remove(0).toString();
      attrs.add(new Attribute(name, null));

    }
    return attrs;
  }

  @Override
  public void usage() {
    super.usage();
  }

}