/****************************************************************************
 * Copyright (C) 2012 HS Coburg.
 * All rights reserved.
 * Contact: ecsec GmbH (info@ecsec.de)
 *
 * This file is part of the Open eCard App.
 *
 * GNU General Public License Usage
 * This file may be used under the terms of the GNU General Public
 * License version 3.0 as published by the Free Software Foundation
 * and appearing in the file LICENSE.GPL included in the packaging of
 * this file. Please review the following information to ensure the
 * GNU General Public License version 3.0 requirements will be met:
 * http://www.gnu.org/copyleft/gpl.html.
 *
 * Other Usage
 * Alternatively, this file may be used in accordance with the terms
 * and conditions contained in a signed written agreement between
 * you and ecsec GmbH.
 *
 ***************************************************************************/

package org.openecard.scio;

import android.nfc.tech.IsoDep;
import java.io.IOException;
import javax.smartcardio.Card;
import javax.smartcardio.CardException;
import javax.smartcardio.CardNotPresentException;
import javax.smartcardio.CardTerminal;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


/**
 * NFC implementation of smartcardio's CardTerminal interface.<br/>
 * Implemented as singleton because we only have one nfc-interface. Only
 * activitys can react on a new intent, so they must set the tag via setTag()
 *
 * @author Dirk Petrautzki <petrautzki@hs-coburg.de>
 */
public class NFCCardTerminal extends CardTerminal {

    private static final Logger logger = LoggerFactory.getLogger(NFCCardTerminal.class);

    private static NFCCardTerminal instance;
    private NFCCard nfcCard;

    private NFCCardTerminal() {
    }

    public int getLengthOfLastAPDU() {
	return ((NFCCardChannel) nfcCard.getBasicChannel()).getLengthOfLastAPDU();
    }

    public int getMaxTransceiveLength() {
	return nfcCard.isodep.getMaxTransceiveLength();
    }

    public synchronized void setTag(IsoDep tag) {
	nfcCard = new NFCCard(tag);
    }

    /**
     * Returns the NFCCardTerminal-Instance.
     *
     * @return The NFCCardTerminal-Instance
     */
    public static synchronized NFCCardTerminal getInstance() {
	if (instance == null) {
	    instance = new NFCCardTerminal();
	}
	return instance;
    }

    @Override
    public synchronized Card connect(String arg0) throws CardException {
	if (nfcCard == null || this.nfcCard.isodep == null) {
	    logger.warn("No tag present.");
	    throw new CardNotPresentException("No tag present");
	}
	try {
	    if (! nfcCard.isodep.isConnected()) {
		nfcCard.isodep.setTimeout(3000);
		nfcCard.isodep.connect();
	    }
	} catch (IOException e) {
	    nfcCard = null;
	    throw new CardException("No connection could be established", e);
	}
	return nfcCard;
    }

    @Override
    public String getName() {
	return "Integrated NFC";
    }

    @Override
    public synchronized boolean isCardPresent() throws CardException {
	boolean ret = (nfcCard != null && nfcCard.isodep != null && nfcCard.isodep.isConnected());
	return ret;
    }

    @Override
    public boolean waitForCardAbsent(long arg0) throws CardException {
	// TODO Auto-generated method stub
	return false;
    }

    @Override
    public boolean waitForCardPresent(long arg0) throws CardException {
	// TODO Auto-generated method stub
	return false;
    }

}