/**
 * 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;

import java.net.InetSocketAddress;

/**
 * RTCP packets for Source Descriptions
 * 
 * @author Arne Kepp
 */
public class RtcpPktSDES extends RtcpPkt {
	/** Whether the RTP Session object should be inclduded */
	boolean reportSelf = true;
	/** The parent RTP Session object, holds participant database */
	RTPSession rtpSession = null;
	/** The participants to create SDES packets for */
	protected Participant[] participants = null;
	
	/**
	 * Constructor to create a new SDES packet
	 * 
	 * TODO:
	 * Currently the added participants are not actually encoded
	 * because the library lacks some support for acting as mixer or
	 * relay in other areas.
	 * 
	 * @param reportThisSession include information from RTPSession as a participant
	 * @param rtpSession the session itself
	 * @param additionalParticipants additional participants to include
	 */
	protected RtcpPktSDES(boolean reportThisSession, RTPSession rtpSession, Participant[] additionalParticipants) {
		super.packetType = 202;
		// Fetch all the right stuff from the database
		reportSelf = reportThisSession;
		participants = additionalParticipants;
		this.rtpSession = rtpSession; 
	}
	
	/**
	 * Constructor that parses a received packet
	 * 
	 * @param aRawPkt the byte[] containing the packet
	 * @param start where in the byte[] this packet starts
	 * @param socket the address from which the packet was received
	 * @param partDb the participant database
	 */
	protected RtcpPktSDES(byte[] aRawPkt,int start, InetSocketAddress socket, ParticipantDatabase partDb) {
		if(RTPSession.rtcpDebugLevel > 8) {
			System.out.println("  -> RtcpPktSDES(byte[], ParticipantDabase)");
		}
		rawPkt = aRawPkt;

		if(! super.parseHeaders(start) || packetType != 202 ) {
			if(RTPSession.rtpDebugLevel > 2) {
				System.out.println(" <-> RtcpPktSDES.parseHeaders() etc. problem");
			}
			super.problem = -202;
		} else {
			//System.out.println(" DECODE SIZE: " + super.length + " itemcount " + itemCount );
			
			int curPos = 4 + start;
			int curLength;
			int curType;
			long ssrc;
			boolean endReached = false;
			boolean newPart;
			this.participants = new Participant[itemCount];
			
			// Loop over SSRC SDES chunks
			for(int i=0; i< itemCount; i++) {
				ssrc = StaticProcs.bytesToUIntLong(aRawPkt, curPos);
				Participant part = partDb.getParticipant(ssrc);
				if(part == null) {
					if(RTPSession.rtcpDebugLevel > 1) {
						System.out.println("RtcpPktSDES(byte[], ParticipantDabase) adding new participant, ssrc:"+ssrc+" "+socket);
					}
					
					part = new Participant(socket, socket , ssrc);
					newPart = true;
				} else {
					newPart = false;
				}
				
				curPos += 4;
							
				//System.out.println("PRE endReached " + endReached + " curPos: " + curPos + " length:" + this.length + (!endReached && (curPos/4) < this.length));
				
				while(!endReached && (curPos/4) <= this.length) {
					//System.out.println("endReached " + endReached + " curPos: " + curPos + " length:" + this.length);
					curType = (int) aRawPkt[curPos];
					
					if(curType == 0) {	
						curPos += 4 - (curPos % 4);
						endReached = true;
					} else {
						curLength  = (int) aRawPkt[curPos + 1];
						//System.out.println("curPos:"+curPos+" curType:"+curType+" curLength:"+curLength+" read from:"+(curPos + 1));

						if(curLength > 0) {
							byte[] item = new byte[curLength];
							//System.out.println("curPos:"+curPos+" arawPkt.length:"+aRawPkt.length+" curLength:"+curLength);
							System.arraycopy(aRawPkt, curPos + 2, item, 0, curLength);
							
							switch(curType) {
							case 1:  part.cname = new String(item); break;
							case 2:  part.name = new String(item); break;
							case 3:  part.email = new String(item); break;
							case 4:  part.phone = new String(item); break;
							case 5:  part.loc = new String(item); break;
							case 6:  part.tool = new String(item); break;
							case 7:  part.note = new String(item); break;
							case 8:  part.priv = new String(item); break;
							}
							//System.out.println("TYPE " + curType + " value:" + new String(item) );
							
						} else {
							switch(curType) {
							case 1:  part.cname = null; break;
							case 2:  part.name = null; break;
							case 3:  part.email = null; break;
							case 4:  part.phone = null; break;
							case 5:  part.loc = null; break;
							case 6:  part.tool = null; break;
							case 7:  part.note = null; break;
							case 8:  part.priv = null; break;
							}
							
						}
						curPos = curPos + curLength + 2;
					}
				}
				
				// Save the participant
				this.participants[i] = part;
				if(newPart)
					partDb.addParticipant(2,part);
				
				//System.out.println("HEPPPPPP " + participants[i].cname );
			}
		}
		if(RTPSession.rtcpDebugLevel > 8) {
			System.out.println("  <- RtcpPktSDES()");
		}
	}

	/**
	 * Encode the packet into a byte[], saved in .rawPkt
	 * 
	 * CompRtcpPkt will call this automatically
	 */
	protected void encode() {	
		byte[] temp = new byte[1450];
		byte[] someBytes = StaticProcs.uIntLongToByteWord(this.rtpSession.ssrc);
		System.arraycopy(someBytes, 0, temp, 4, 4);
		int pos = 8;
	
		String tmpString = null;
		for(int i=1; i<9;i++) {			
			switch(i) {
				case 1:  tmpString = this.rtpSession.cname; break;
				case 2:  tmpString = this.rtpSession.name; break;
				case 3:  tmpString = this.rtpSession.email; break;
				case 4:  tmpString = this.rtpSession.phone; break;
				case 5:  tmpString = this.rtpSession.loc; break;
				case 6:  tmpString = this.rtpSession.tool; break;
				case 7:  tmpString = this.rtpSession.note; break;
				case 8:  tmpString = this.rtpSession.priv; break;
			}
			
			if(tmpString != null) {
				someBytes = tmpString.getBytes();
				temp[pos] = (byte) i;
				temp[pos+1] = (byte) someBytes.length;
				System.arraycopy(someBytes, 0, temp, pos + 2, someBytes.length);
				//System.out.println("i: "+i+" pos:"+pos+" someBytes.length:"+someBytes.length);
				pos = pos + someBytes.length + 2;
				//if(i == 1 ) {
				//	System.out.println("trueeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee" + tmpString);
				//}
			}
		}
		int leftover = pos % 4;
		if(leftover == 1) {
			temp[pos] = (byte) 0; 
			temp[pos + 1] = (byte) 1; 
			pos += 3;
		} else if(leftover == 2) {
			temp[pos] = (byte) 0; 
			temp[pos + 1] = (byte) 0; 
			pos += 2;
		} else if(leftover == 3) {
			temp[pos] = (byte) 0; 
			temp[pos + 1] = (byte) 3; 
			pos += 5;
		}
		
		// TODO Here we ought to loop over participants, if we're doing SDES for other participants.
		
		super.rawPkt = new byte[pos];
		itemCount = 1;
		//This looks wrong, but appears to be fine..
		System.arraycopy(temp, 0, super.rawPkt, 0, pos);
		writeHeaders();
	}
	
	/**
	 * Debug purposes only
	 */
	public void debugPrint() {
		System.out.println("RtcpPktSDES.debugPrint() ");
		if(participants != null) {
			for(int i= 0; i<participants.length; i++) {
				Participant part = participants[i];
				System.out.println("     part.ssrc: " + part.ssrc + "  part.cname: " + part.cname + " part.loc: " + part.loc);
			}
		} else {
			System.out.println("     nothing to report (only valid for received packets)");
		}
	}
}