/*
 * 
 *               Panbox - encryption for cloud storage 
 *      Copyright (C) 2014-2015 by Fraunhofer SIT and Sirrix AG 
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 * 
 * Additonally, third party code may be provided with notices and open source
 * licenses from communities and third parties that govern the use of those
 * portions, and any licenses granted hereunder do not alter any rights and
 * obligations you may have under such open source licenses, however, the
 * disclaimer of warranty and limitation of liability provisions of the GPLv3 
 * will apply to all the product.
 * 
 */
package org.panbox.desktop.common.pairing.cam;

import java.util.ArrayList;
import java.util.List;

import org.bytedeco.javacpp.opencv_core.IplImage;

import com.google.zxing.BinaryBitmap;
import com.google.zxing.LuminanceSource;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.NotFoundException;
import com.google.zxing.Result;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.common.HybridBinarizer;

public class QRCodeProcessor extends AbstractProcessor {

	private List<QRCodeListener> listeners = new ArrayList<QRCodeListener>();
	private long lastFoundTime = 0;
	private final static long CLEAR_RESULT_TIMEOUT = 5000;
	private String lastResult = "";

	public QRCodeProcessor() {
	}

	public void addSquareCodeListener(QRCodeListener sql) {
		listeners.add(sql);
	}

	public void removeSquareCodeListener(QRCodeListener sql) {
		listeners.remove(sql);
	}

	private void fire(String text) {
		List<QRCodeListener> tmp = new ArrayList<QRCodeListener>(listeners);
		for (QRCodeListener sql : tmp) {
			sql.qrCodeDetected(text);
		}
	}

	@Override
	public IplImage processImage(IplImage in) {
		LuminanceSource source = new BufferedImageLuminanceSource(
				in.getBufferedImage());
		BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
		Result result;
		try {
			result = new MultiFormatReader().decode(bitmap);
			lastResult = result.getText();
			lastFoundTime = System.currentTimeMillis();
			fire(result.getText());
		} catch (NotFoundException e) {
			// that's ok
			if (!lastResult.equals("")) // if result was not empty, clear old
										// result
			{
				long mt1 = System.currentTimeMillis();
				if (mt1 - lastFoundTime > CLEAR_RESULT_TIMEOUT) {
					lastFoundTime = mt1;
					fire("");
					lastResult = "";
				}
			}
		}

		return in;
	}
}