/*
 * Class contains functions to determine and decode incomming packages
 * ->don't read this without the class PacketGenerator, since they belong together
 * 
 * Autor: Dumeni Manatschal
 * 
*/

#include <enet/enet.h>
#include "PacketManager.h"
#include <iostream>

using namespace std;
using namespace network;

PacketDecoder::PacketDecoder(){}

//call this function out of an instance of PacketDecoder
//it will determine the type id and call the right decode function
bool PacketDecoder::elaborate( ENetPacket* packet, int clientId )
{
	int client = clientId;
	cout << "clientId: " << client << endl; //control cout, not important, just debugging info
	int id = (int)*packet->data; //the first 4 bytes are always the enet packet id
	switch( id ) {
	case ACK:
		acknowledgement( packet );
		return true;
		break;
	case MOUSE:
		mousem( packet );
		return true;
		break;
	case KEYBOARD:
		keystrike( packet );
		return true;
		break;
	case CHAT:
		chatMessage( packet );
		return true;
		break;
	case GAMESTATE:
		gstate( packet );
		return true;
		break;
          case CLASSID:
                clid(packet);
                return true;
                break;
	}
	return false;
}

//following are the decode functions for the data of the packets

void PacketDecoder::acknowledgement( ENetPacket* packet )
{
	ack* a = new ack;
	*a = *(ack*)packet->data; //press pattern of ack on new data
	
	//clean memory
	enet_packet_destroy( packet );
	
	printAck( a ); //debug info
}

void PacketDecoder::mousem( ENetPacket* packet )
{
	mouse* mouseMove = new mouse;
	//copy data of packet->data to new struct
	*mouseMove = *(mouse*)packet->data; 
	
	//clean memory
	enet_packet_destroy( packet );
	
	printMouse( mouseMove ); //debug info
}

void PacketDecoder::keystrike( ENetPacket* packet )
{
	keyboard* key = new keyboard;
	*key = *(keyboard*)packet->data; //see above
	
	//clean memory
	enet_packet_destroy( packet );
	
	printKey( key ); //debug info

}

void PacketDecoder::chatMessage( ENetPacket* packet )
{
	chat* chatting = new chat;
	chatting->id = (int)*packet->data; //first copy id into new struct
	//since the chat message is a char*, allocate the memory needed
	char* reserve = new char[packet->dataLength-4]; 
	//copy the transmitted bytestream into the new generated char*,
	//note the lenght of the message is represented as "packet->dataLength-sizeof( int )" 
	memcpy( &reserve[0], packet->data+sizeof(int), packet->dataLength-sizeof(int) );
	//put pointer of chatting struct to the begining of the new generated char*
	chatting->message = reserve;
	
	//clean memory
	enet_packet_destroy( packet );
	
	processChat( chatting ); //debug info
	
}

void PacketDecoder::gstate( ENetPacket* packet )
{
	GameStateCompressed* currentState = new GameStateCompressed;
	//since it's not alowed to use void* for pointer arithmetic
	unsigned char* data = (unsigned char*)packet->data;
	//copy the GameStateCompressed id into the struct, which is located at second place data+sizeof( int )
	memcpy( (void*)&(currentState->id), (const void*)(data+sizeof( int )), sizeof( int ) );
	//copy the size of the GameStateCompressed compressed data into the new GameStateCompressed struct, located at 3th
	//position of the data stream, data+2*sizeof( int )
	memcpy( (void*)&(currentState->compsize), (const void*)(data+2*sizeof( int )), sizeof( int) );
	//size of uncompressed data
	memcpy( (void*)&(currentState->normsize), (const void*)(data+3*sizeof( int )), sizeof( int ) );
	//since data is not allocated, because it's just a pointer, allocate it with size of gamestatedatastream
	currentState->data = (unsigned char*)(malloc( currentState->compsize ));
	//copy the GameStateCompressed data
	memcpy( (void*)(currentState->data), (const void*)(data+4*sizeof( int )), currentState->compsize );
  
	//clean memory
	enet_packet_destroy( packet );
  //run processGameStateCompressed
  //TODO: not yet implemented!
  //processGamestate(currentState);
}

void PacketDecoder::clid( ENetPacket *packet)
{
        classid* cid = new classid;
        cid->length = ((classid*)(packet->data))->length;
        cid->id = ((classid *)(packet->data))->id;
        cid->clid = ((classid *)(packet->data))->clid;
        cid->message = (const char *)malloc(cid->length);
        enet_packet_destroy( packet );
        processClassid(cid);
}


// now the data processing functions:

void PacketDecoder::processChat( chat *data){
  printChat(data);
}

void PacketDecoder::processClassid( classid *cid){
  printClassid(cid);
  return;
}



//these are some print functions for test stuff

void PacketDecoder::printAck( ack* data )
{
	cout << "data id: " << data->id << endl;
	cout << "data:    " << data->a << endl;
}

void PacketDecoder::printMouse( mouse* data )
{
	cout << "data id: " << data->id << endl;
	cout << "data:    " << data->x << " " << data->y << endl;
}

void PacketDecoder::printKey( keyboard* data )
{
	cout << "data id: " << data->id << endl;
	cout << "data:    " << (char)data->press << endl;
}

void PacketDecoder::printChat( chat* data )
{
	cout << "data id: " << data->id << endl;
	cout << "data:    " << data->message << endl;
}

void PacketDecoder::printGamestate( GameStateCompressed* data )
{
	cout << "id of GameStateCompressed:   " << data->id << endl;
	cout << "size of GameStateCompressed: " << data->compsize << endl;
}

void PacketDecoder::printClassid( classid *cid)
{
        cout << "id of classid:    " << cid->id << endl;
        cout << "size of classid:  " << cid->length << endl;
        cout << "ID of classid:    " << cid->clid <<endl;
        cout << "data of classid:  " << cid->message <<endl;
}