/** @file
 * $Author: nagni $
 * $Date: 2004/06/09 23:18:20 $
 * $Revision: 1.12 $
 * 
 * Implementation of the functions of a sample Algorithm class.
 * This file can be used as a templace to develop your own algorithm.
 */

#include <log4cpp/Category.hh>
#include <fstream>
#include "TechmodelAlgorithm.h"
#include "EventReader.h"
#include "ReaderAlgorithms.h"
#include "Exception.h"
#include "stdio.h"
extern "C" {
#include "CRC.h"
}

#define BYTE unsigned char

using namespace pamela;
using namespace pamela::techmodel;

static log4cpp::Category& cat = log4cpp::Category::getInstance("pamela.techmodel.EventReader");
static unsigned int prevPckCounter = 0;
static unsigned int prevPckOBT     = 0;
/**
 * Constructor. 
 */
EventReader::EventReader(void): 
  TechmodelAlgorithm(0, "TechmodelEventReader") { 
  cat <<  log4cpp::Priority::DEBUG
      <<  "Constructor "
      <<  "\n " << log4cpp::CategoryStream::ENDLINE;
  Header = new EventHeader();
  /*
  
  
  TechmodelAlgorithmMap.insert(AlgorithmMap::value_type(PacketType::Alarm,
  						  new AlarmReader()));
  TechmodelAlgorithmMap.insert(AlgorithmMap::value_type(PacketType::Khb,
  						  new KhbReader()));
 */
  TechmodelAlgorithmMap.insert(AlgorithmMap::value_type(PacketType::Physics,    new PhysicsReader()));
  TechmodelAlgorithmMap.insert(AlgorithmMap::value_type(PacketType::ForcedPkt,  new ForcedPktReader())); 
  TechmodelAlgorithmMap.insert(AlgorithmMap::value_type(PacketType::RunHeader,  new RunHeaderReader()));
  TechmodelAlgorithmMap.insert(AlgorithmMap::value_type(PacketType::RunTrailer, new RunTrailerReader()));
  TechmodelAlgorithmMap.insert(AlgorithmMap::value_type(PacketType::Log,      new LogReader()));
  TechmodelAlgorithmMap.insert(AlgorithmMap::value_type(PacketType::VarDump,  new VarDumpReader()));
  TechmodelAlgorithmMap.insert(AlgorithmMap::value_type(PacketType::ArrDump,  new ArrDumpReader()));
  TechmodelAlgorithmMap.insert(AlgorithmMap::value_type(PacketType::TabDump,  new TabDumpReader()));
  TechmodelAlgorithmMap.insert(AlgorithmMap::value_type(PacketType::Tmtc,     new TmtcReader()));
  TechmodelAlgorithmMap.insert(AlgorithmMap::value_type(PacketType::Mcmd,     new McmdReader()));
  TechmodelAlgorithmMap.insert(AlgorithmMap::value_type(PacketType::CalibCal, new CalibCalReader()));
  TechmodelAlgorithmMap.insert(AlgorithmMap::value_type(PacketType::CalibTrk, new CalibTrkReader()));
  TechmodelAlgorithmMap.insert(AlgorithmMap::value_type(PacketType::CalibTrg, new CalibTrgReader()));
  TechmodelAlgorithmMap.insert(AlgorithmMap::value_type(PacketType::CalibTrd, new CalibTrdReader()));
  TechmodelAlgorithmMap.insert(AlgorithmMap::value_type(PacketType::CalibTof, new CalibTofReader()));
  TechmodelAlgorithmMap.insert(AlgorithmMap::value_type(PacketType::CalibS4,  new CalibS4Reader()));
  /*
  TechmodelAlgorithmMap.insert(AlgorithmMap::value_type(PacketType::HA_Header_E5,
  						  new E5Reader()));
*/
}

/**
 * Get a string with the version info of the algorithm.
 */
std::string EventReader::GetVersionInfo(void) const {
  return 
    "$Header: /home/cvspamela/yoda/techmodel/EventReader.cpp,v 1.12 2004/06/09 23:18:20 nagni Exp $\n";
}

/**
 * Initialize the algorithm with a special run. This will initialize the
 * event reader routines for all packet types.
 */
void EventReader::Init(PamelaRun *run) {
    SetInputStream(run);
    
    //Create the structure of directories and create xxx.Header.root files
    run->WriteHeaders(this, &Header); 

    //Create the xxx.root in it's specific directory
    for (AlgorithmMap::iterator i = TechmodelAlgorithmMap.begin(); 
       i != TechmodelAlgorithmMap.end(); i++) {
       cat  <<  log4cpp::Priority::DEBUG 
            <<  " Initializing algo " << i->second->GetAlgorithmName()
            <<  "\n " << log4cpp::CategoryStream::ENDLINE;
       i->second->Init(run);
    }
    Run = dynamic_cast<TechmodelPamelaRun*>(run);
}

static void SkipToNextHeader(ifstream *);

/**
 * Read the next event header, call the reader algorithms that
 * correspond to its packet type, and read the event trailer.
 */

// 15 June 2004 ---note------------------
// A nice refacoring would require to not read again the packet data (which is
// read in the UnpackPscuHeader() and put directly in the
// EventAlgorithm->RunEvent(....) directly the data inside the packet.... will see later....
// 15 June 2004 ---note------------------
void EventReader::RunEvent(int EventNumber) {
  
  cat <<  log4cpp::Priority::ERROR <<  "Start Unpacking........"
      <<  "\n " << log4cpp::CategoryStream::ENDLINE;
  //for now i'll suppose that the raw file starts immediately with the right bytes
  //to insert a GetPacketStart()
  while (!InputFile->eof()){
    try {
      if (FindStart()) {
	if(UnpackPscuHeader()){
            const PacketType* type = Header->GetPscuHeader()->GetPacketType();
            AlgorithmMap::iterator i = TechmodelAlgorithmMap.find(type); 
            if (i != TechmodelAlgorithmMap.end()) {
                TechmodelAlgorithm *EventAlgorithm = i->second;
                EventAlgorithm->RunEvent(EventNumber, Header->GetPscuHeader()->GetPacketLenght());
                Run->FillTrees(type);
                Header->GetCounter()->Increment(type);
            } else {
            cat <<  log4cpp::Priority::ERROR 
                <<  "No way to read events of type" << type->GetName()
                <<  "\n " << log4cpp::CategoryStream::ENDLINE;
	    throw Exception("No way to read events of type " + type->GetName());
	}
      } //else {
        //**TO BE DONE**   <<WRONG CRC l --- LOST PACKET>>//
        //Have to be defined a "WrongCRC" packet::Type?
        //}
     } 
    } catch (...) {
      //This have to be more detailed. More exceptions type are needed.
      cat <<  log4cpp::Priority::ERROR <<  "Couldn't read the event. Skipping to the next header."
          <<  "\n " << log4cpp::CategoryStream::ENDLINE;
    }
  }
  Header->GetCounter()->PrintCounters();
}

static void SkipToNextHeader(ifstream* TechmodelFile) {
  //  yeah.
}



/**
 * Unpack the PSCU header from a file into the structure.
 */
int EventReader::UnpackPscuHeader(void) throw (std::exception) {
  int response;
  char buff[16];
  InputFile->read(buff, sizeof(buff));
  
  prevPckCounter = 0;
  prevPckOBT     = 0;
  
  unsigned char PacketId1    = buff[3];
  unsigned char PacketId2    = buff[4];
  unsigned int  Counter      = (((UINT32)buff[5]<<16)&0x00FF0000) + (((UINT32)buff[6]<<8)&0x0000FF00) + (((UINT32)buff[7])&0x000000FF);
  unsigned int  OrbitalTime  = (((UINT32)buff[8]<<24)&0xFF000000) + (((UINT32)buff[9]<<16)&0x00FF0000) +  (((UINT32)buff[10]<<8)&0x0000FF00) + (((UINT32)buff[11])&0x000000FF);
  unsigned int  PacketLenght = (((UINT32)buff[12]<<16)&0x00FF0000) +  (((UINT32)buff[13]<<8)&0x0000FF00) + (((UINT32)buff[14])&0x000000FF);
  unsigned char CRC          = buff[15];

  if (Counter < prevPckCounter){
    cat <<  log4cpp::Priority::ERROR
        <<  " Packet counter is less than before of " << (prevPckCounter - Counter)
        <<  "\n " << log4cpp::CategoryStream::ENDLINE;
  }

  if (OrbitalTime < prevPckOBT){
      cat <<  log4cpp::Priority::WARN
          <<  " Orbital Time is less than before of " << (prevPckOBT - OrbitalTime)
          <<  "\n " << log4cpp::CategoryStream::ENDLINE;
  }

 
  if ((BYTE)CM_Compute_CRC16(0, (BYTE*)&buff, 15) == (BYTE)buff[15]){
    long int initPos = InputFile->tellg();
    long int finalPos;
    Header->GetPscuHeader()->SetPacketId(PacketId1, PacketId2);
    Header->GetPscuHeader()->SetCounter(Counter);
    Header->GetPscuHeader()->SetOrbitalTime(OrbitalTime);
    //PacketLength is the length of the whole DATApacket starting from the first byte after the header
    //plus the CRC legth (which varies for each type of packet)
    Header->GetPscuHeader()->SetPacketLenght(PacketLenght);
    Header->GetPscuHeader()->SetCRC(CRC);
    
    //commented out because of the above test code
    InputFile->seekg(Header->GetPscuHeader()->GetPacketLenght(), std::ios::cur);
    FindStart();
    finalPos =  (long int)InputFile->tellg() - (1 + initPos + (long int)(Header->GetPscuHeader()->GetPacketLenght()));
        if(finalPos == 0){
            cat <<  log4cpp::Priority::INFO <<  " Correct packet length \n" 
                <<  "\n " << log4cpp::CategoryStream::ENDLINE;
            } 
        if (finalPos > 0 && finalPos < 64) {
            cat <<  log4cpp::Priority::WARN
                <<  " Correct packet length: Padded of " << finalPos << " bytes \n"
                <<  "\n " << log4cpp::CategoryStream::ENDLINE;
        } 
        if (finalPos > 64){
            cat <<  log4cpp::Priority::ERROR <<  " Wrong packet length? (because of wrong padding?) \n"
                <<  "\n " << log4cpp::CategoryStream::ENDLINE;
        }
        InputFile->seekg(initPos, std::ios::beg);
        response =  true;
  } else {
    cat <<  log4cpp::Priority::ERROR <<  " WRONG CRC FOR HEADER "
        <<  "\n " << log4cpp::CategoryStream::ENDLINE;
    response =  false; 
  }

    char tmpId1[4];
    char tmpId2[4];
    char tmpLength[12];
    char tmpStart[100];
    char tmpCRC[4];
    sprintf(tmpId1, "%02X", PacketId1);
    sprintf(tmpId2, "%02X", PacketId2);
    sprintf(tmpLength, "%06X", PacketLenght);
    sprintf(tmpStart, "%X", ((long int)(InputFile->tellg()) - 16));
    sprintf(tmpCRC, "%02X", CRC);
    cat <<  log4cpp::Priority::INFO  
        <<  "\n Packet Counter (decimal) : "  <<  Counter
        <<  "\n Id1 - Id2                : "  <<  tmpId1 <<  " - " <<  tmpId2
        <<  "\n Orbital Time (decimal)   : "  <<  OrbitalTime
        <<  "\n Lenght                   : "  <<  tmpLength
        <<  "\n CRC                      : "  <<  tmpCRC
        <<  "\n Header Start Position    : "  <<  tmpStart
        <<  "\n " << log4cpp::CategoryStream::ENDLINE;
  return response;
}

/**
 * Unpack the trailer of a PSCU event into the structure.
 */
void EventReader::UnpackPscuTrailer(void) throw (std::exception) {

}

/**
 * Find the next starting poin for the PSCU event looking for a {0xFA, 0xFE, 0xDE} sequence
 */
int EventReader::FindStart(void) throw (std::exception) {
//search an hexadecimal sequence in a file
//subSign    ------> pointer to the sequence buffer
//subSignDim ------> dimension of the buffer
// at exit
// return true if founds a match (else false)
// subF point rigth after the match, if found. Else EOF.
//Maurizio 15/11/2002-----------------------
  const unsigned char subSign[3]={0xFA, 0xFE, 0xDE};
  int subSignDim = 3;
//------------------------------------------
  int subIndex = 0;
  char dataByte;
  /*InputFile->read(fileByte, 1); 
    if ( *fileByte ==  *(subSign+subIndex)){
       if (subIndex++ == (subSignDim-1)) {
        InputFile->seekg(-(subIndex), std::ios::cur);
	return 1;
      }
      }*/
  while (!InputFile->eof()) {
    InputFile->get(dataByte);
    if (dataByte == (char)(*(subSign+subIndex))){
      if (subIndex++ == (subSignDim-1)) {
	 InputFile->seekg(-(subIndex), std::ios::cur);
	return 1;
       }
    } else {
      if (InputFile->eof()) {
	throw Exception("Extra bytes over the last packets");
      } else {
	return 0;
      }
      //InputFile->seekg(-(subIndex+1), std::ios::cur);
      //subIndex = 0;
    } 
  }
  return 0;
} 

ClassImp(EventReader)