/***************************************************************************
 * By Théophile Bastian, 2017
 * M1 Network course project at ENS Cachan, Juliusz Chroboczek.
 * License: WTFPL v2 <http://www.wtfpl.net/>
 **************************************************************************/

#include "packetParser.h"
#include <cstring>

PacketParser::PacketParser(Neighbours* nei, Protocol* proto) :
	neighbours(nei), protocol(proto)
{}

void PacketParser::parse(Bytes pck) {
	u64 peerId;
	pck >> peerId;
	neighbours->receivedFrom(peerId);

	while(pck.size() > 0) {
		readTLV(pck, peerId);
	}
}

void PacketParser::readTLV(Bytes& pck, u64 nei) {
	u8 type, len;
	pck >> type >> len;

	switch(type) {
		case csts::TLV_PAD1:
		case csts::TLV_PADN:
			break;

		case csts::TLV_IHU: {
			u64 ihuId;
			pck >> ihuId;
			if(ihuId != protocol->getSelfId())
				break;

			neighbours->hadIHU(nei);
			break;
		}

		case csts::TLV_NR:
			//TODO
			break;

		case csts::TLV_NEIGH:
			receiveNeigh(pck, len);
			break;

		case csts::TLV_DATA:
			receiveData(pck, len, nei);
			break;

		case csts::TLV_IHAVE:
			//TODO
			break;
	}
}

void PacketParser::receiveNeigh(Bytes& pck, u8 length) {
	while(length >= 8+16+2) { /* enough to read one peer */
		u64 id;
		u16 port;
		SockAddr addr;
		memset(&addr, 0, sizeof(addr));
		addr.sin6_family = AF_INET6;

		pck >> id;
		for(int byte=0; byte < 16; byte++)
			pck >> addr.sin6_addr.s6_addr[byte];
		pck >> port;
		addr.sin6_port = htons(port);

		Neighbour nei(id, addr);
		neighbours->addPotentialNei(nei);
	}
}

void PacketParser::receiveData(Bytes& pck, u8 length, u64 from) {
	u32 seqNo;
	u64 datId;
	pck >> seqNo >> datId;
	protocol->sendIHave(from, datId, seqNo);
	//TODO
	length++;
}