/**

 * Java RTP Library (jlibrtp)

 * Copyright (C) 2006 Arne Kepp

 * 

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.1 of the License, or (at your option) any later version.

 *

 * This library 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

 * Lesser General Public License for more details.

 * 

 * You should have received a copy of the GNU Lesser General Public

 * License along with this library; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

 */

package jlibrtp;

/**

 * RTCP packets for sending Bye messages

 * 

 * @author Arne Kepp

 */

public class RtcpPktBYE extends RtcpPkt {

	/** SSRCs saying bye, 32xn bits, n<16 */

	protected long[] ssrcArray = null;

	/** Optional reason */

	protected byte[] reason = null;

	protected RtcpPktBYE(long[] ssrcs,byte[] aReason) {

		super.packetType = 203;

		// Fetch all the right stuff from the database

		reason = aReason;

		ssrcArray = ssrcs;

		if(ssrcs.length < 1) {

			System.out.println("RtcpBYE.RtcpPktBYE(long[] ssrcs, byte[] aReason) requires at least one SSRC!");

		}

	}

	protected RtcpPktBYE(byte[] aRawPkt, int start) {

		rawPkt = aRawPkt;

		if(!super.parseHeaders(start) || packetType != 203 ) {

			if(RTPSession.rtpDebugLevel > 2) {

				System.out.println(" <-> RtcpPktBYE.parseHeaders() etc. problem");

			}

			super.problem = -203;

		} else {

			ssrcArray = new long[super.itemCount];

			for(int i=0; i<super.itemCount; i++) {

				ssrcArray[i] = StaticProcs.bytesToUIntLong(aRawPkt, start + (i+1)*4);

			}

			if(super.length > (super.itemCount + 1)) {

				int reasonLength = (int) aRawPkt[start + (super.itemCount+1)*4];

				//System.out.println("super.itemCount:"+super.itemCount+" reasonLength:"+reasonLength+" start:"+(super.itemCount*4 + 4 + 1));

				reason = new byte[reasonLength];

				System.arraycopy(aRawPkt, start + (super.itemCount + 1)*4 + 1, reason, 0, reasonLength);

				//System.out.println("test:" + new String(reason));

			}

		}

	}

	protected void encode() {			

		itemCount = ssrcArray.length;

		length = 4*ssrcArray.length;

		if(reason != null) {

			length += (reason.length + 1)/4;

			if((reason.length + 1) % 4 != 0) {

				length +=1;

			}

		}

		rawPkt = new byte[length*4 + 4];

		int i;

		byte[] someBytes;

		// SSRCs

		for(i=0; i<ssrcArray.length; i++ ) {

			someBytes = StaticProcs.uIntLongToByteWord(ssrcArray[i]);

			System.arraycopy(someBytes, 0, rawPkt, 4 + 4*i, 4);			

		}

		// Reason for leaving

		if(reason != null) {

			//System.out.println("Writing to:"+(4+4*ssrcArray.length)+ " reason.length:"+reason.length );

			rawPkt[(4 + 4*ssrcArray.length)] = (byte) reason.length;

			System.arraycopy(reason, 0, rawPkt, 4+4*i +1, reason.length);		

		}

		super.writeHeaders();

	}

	public void debugPrint() {

		System.out.println("RtcpPktBYE.debugPrint() ");

		if(ssrcArray != null) {

			for(int i= 0; i<ssrcArray.length; i++) {

				long anSsrc = ssrcArray[i];

				System.out.println("     ssrc: " + anSsrc);

			}

		}

		if(reason != null) {

			System.out.println("     Reason: " + new String(reason));

		}

	}

}