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package net.spy.memcached.protocol.binary;

import java.io.IOException;
import java.util.Map;

import javax.security.auth.callback.CallbackHandler;
import javax.security.sasl.Sasl;
import javax.security.sasl.SaslClient;
import javax.security.sasl.SaslException;

import net.spy.memcached.ops.OperationCallback;
import net.spy.memcached.ops.OperationState;
import net.spy.memcached.ops.OperationStatus;
import net.spy.memcached.ops.StatusCode;

public abstract class SASLBaseOperationImpl extends OperationImpl {

  private static final int SASL_CONTINUE = 0x21;

  protected final String[] mech;
  protected final byte[] challenge;
  protected final String serverName;
  protected final Map props;
  protected final CallbackHandler cbh;

  public SASLBaseOperationImpl(int c, String[] m, byte[] ch,
                               String s, Map p, CallbackHandler h,
                               OperationCallback cb) {
    super(c, generateOpaque(), cb);
    mech = m;
    challenge = ch;
    serverName = s;
    props = p;
    cbh = h;
  }

  @Override
  public void initialize() {
    try {
      SaslClient sc = Sasl.createSaslClient(mech, null,
              "memcached", serverName, props, cbh);

      byte[] response = buildResponse(sc);
      String mechanism = sc.getMechanismName();

      prepareBuffer(mechanism, 0, response);
    } catch (SaslException e) {
      // XXX:  Probably something saner can be done here.
      throw new RuntimeException("Can't make SASL go.", e);
    }
  }

  protected abstract byte[] buildResponse(SaslClient sc) throws SaslException;

  @Override
  protected void decodePayload(byte[] pl) {
    getLogger().debug("Auth response:  %s", new String(pl));
  }

  @Override
  protected void finishedPayload(byte[] pl) throws IOException {
    if (errorCode == SASL_CONTINUE) {
      getCallback().receivedStatus(new OperationStatus(true,
              new String(pl), StatusCode.SUCCESS));
      transitionState(OperationState.COMPLETE);
    } else if (errorCode == 0) {
      getCallback().receivedStatus(new OperationStatus(true,
              "", StatusCode.SUCCESS));
      transitionState(OperationState.COMPLETE);
    } else {
      super.finishedPayload(pl);
    }
  }

  @Override
  public boolean isBulkOperation() {
    return false;
  }

  @Override
  public boolean isPipeOperation() {
    return false;
  }

}