/*
 * Copyright 2008 Federal Chancellery Austria and
 * Graz University of Technology
 *
 * 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 at.gv.egiz.smcc.reader;

import at.gv.egiz.smcc.conf.SMCCConfiguration;
import at.gv.egiz.smcc.util.SMCCHelper;
import java.util.HashMap;
import java.util.Map;
import javax.smartcardio.Card;
import javax.smartcardio.CardException;
import javax.smartcardio.CardTerminal;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 *
 * @author Clemens Orthacker <clemens.orthacker@iaik.tugraz.at>
 */
public class ReaderFactory {

  protected final static Log log = LogFactory.getLog(ReaderFactory.class);
  
  protected SMCCConfiguration configuration;

  private ReaderFactory() {
  }

  /**
   * @param configuration the configuration to set
   */
  public void setConfiguration(SMCCConfiguration configuration) {
    this.configuration = configuration;
  }

  public static CardReader getReader(Card icc, CardTerminal ct) {

    String name = ct.getName();
    log.info("creating reader " + name);

    Map<Byte, Integer> features = queryFeatures(icc);
    boolean disablePinpad = false;
    CardReader reader;

        //TODO query application context for reader config
//    if (configuration != null) {
//      String disablePinpad = configuration.getProperty(SMCCConfiguration.DISABLE_PINPAD_P);
//      log.debug("setting disablePinpad to " + Boolean.parseBoolean(disablePinpad));
//      reader.setDisablePinpad(Boolean.parseBoolean(disablePinpad));
//    }
    log.warn("card reader configuration is not considered");

    if (features.isEmpty() || disablePinpad) {
      reader = new DefaultCardReader(ct);
    } else {
      reader = new PinpadCardReader(ct, features);
    }

    return reader;
  }

  private static int CTL_CODE(int code) {
    String os_name = System.getProperty("os.name").toLowerCase();
    if (os_name.indexOf("windows") > -1) {
      // cf. WinIOCTL.h
      return (0x31 << 16 | (code) << 2);
    }
    // cf. reader.h
    return 0x42000000 + (code);
  }

  static int IOCTL_GET_FEATURE_REQUEST = CTL_CODE(3400);

  private static Map<Byte, Integer> queryFeatures(Card icc) {
    Map<Byte, Integer> features = new HashMap<Byte, Integer>();

    if (icc == null) {
      log.warn("invalid card handle, cannot query ifd features");
    } else {
      try {
        if (log.isTraceEnabled()) {
          log.trace("GET_FEATURE_REQUEST " + Integer.toHexString(IOCTL_GET_FEATURE_REQUEST));
        }
        byte[] resp = icc.transmitControlCommand(IOCTL_GET_FEATURE_REQUEST,
                new byte[0]);

        if (log.isTraceEnabled()) {
          log.trace("Response TLV " + SMCCHelper.toString(resp));
        }
        // tag
        // length in bytes (always 4)
        // control code value for supported feature (in big endian)
        for (int i = 0; i < resp.length; i += 6) {
          Byte feature = new Byte(resp[i]);
          Integer ioctl = new Integer((0xff & resp[i + 2]) << 24) |
                  ((0xff & resp[i + 3]) << 16) |
                  ((0xff & resp[i + 4]) << 8) |
                  (0xff & resp[i + 5]);
          if (log.isInfoEnabled()) {
            log.info("IFD supports " + CardReader.FEATURES[feature.intValue()] +
                    ": " + Integer.toHexString(ioctl.intValue()));
          }
          features.put(feature, ioctl);
        }
      } catch (CardException ex) {
        log.debug("Failed to query IFD features: " + ex.getMessage());
        log.trace(ex);
        log.info("IFD does not support secure pin entry");
      }
    }
    return features;
  }

}