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//
// $Id: G4MPIbatch.cc,v 1.2 2010/05/18 06:06:21 kmura Exp $
// $Name: geant4-09-04-beta-01 $
//
// ====================================================================
//   G4MPIsession.cc
//
//                                         2007 Q
// ====================================================================
#include "G4MPIbatch.hh"
#include "G4MPImanager.hh"
#include "G4UImanager.hh"
#include "G4UIcommandStatus.hh"
#include <vector>

////////////////////////////////////////////////////////////////////////
static void Tokenize(const G4String& str, std::vector<G4String>& tokens)
////////////////////////////////////////////////////////////////////////
{
  const char* delimiter= " ";

  str_size pos0= str.find_first_not_of(delimiter);
  str_size pos = str.find_first_of(delimiter, pos0);

  while (pos != G4String::npos || pos0 != G4String::npos) {
    if (str[pos0] == '\"') {
      pos = str.find_first_of("\"", pos0+1);
      if(pos != G4String::npos) pos++;
    }
    if (str[pos0] == '\'') {
      pos = str.find_first_of("\'", pos0+1);
      if(pos != G4String::npos) pos++;
    }

    tokens.push_back(str.substr(pos0, pos-pos0));
    pos0 = str.find_first_not_of(delimiter, pos);
    pos = str.find_first_of(delimiter, pos0);
  }
}

// ====================================================================
//
// class description
//
// ====================================================================

////////////////////////////////////////////////////////////
G4MPIbatch::G4MPIbatch(const G4String& fname, G4bool qbatch)
  : G4VMPIsession(),
    isOpened(false), isBatchMode(qbatch)
////////////////////////////////////////////////////////////
{
  if(isMaster) {
    batchStream.open(fname, std::ios::in);
    if(batchStream.fail()) {
      G4cerr << "cannot open a macro file(" << fname << ")."
             << G4endl;
    } else {
      isOpened= true;
    }
  }
}


/////////////////////////////
G4MPIbatch::~G4MPIbatch()
/////////////////////////////
{
  if(isOpened) batchStream.close();
}


//////////////////////////////////
G4String G4MPIbatch::ReadCommand()
//////////////////////////////////
{
  enum { BUFSIZE= 4096 };
  static char linebuf[BUFSIZE];

  G4String cmdtotal= "";
  G4bool qcontinued= false;
  while(batchStream.good()) {
    batchStream.getline(linebuf, BUFSIZE);

    G4String cmdline(linebuf);

    // TAB-> ' ' conversion
    str_size nb=0;
    while ((nb= cmdline.find('\t',nb)) != G4String::npos) {
      cmdline.replace(nb, 1, " ");
    }

    // strip
    cmdline= cmdline.strip(G4String::both);

    // skip null line if single line
    if(!qcontinued && cmdline.size()==0) continue;

    // '#' is treated as echoing something
    if(cmdline[(size_t)0]=='#') return cmdline;

    // tokenize...
    std::vector<G4String> tokens;
    Tokenize(cmdline, tokens);
    qcontinued= false;
    for (G4int i=0; i< G4int(tokens.size()); i++) {
      // string after '#" is ignored
      if(tokens[i][(size_t)0] == '#' ) break;
      // '\' or '_' is treated as continued line.
      if(tokens[i] == '\\' || tokens[i] == '_' ) {
        qcontinued= true;
        // check nothing after line continuation character
        if( i != G4int(tokens.size())-1) {
          G4Exception("unexpected character after "
                      "line continuation character");
        }
        break; // stop parsing
      }
      cmdtotal+= tokens[i];
      cmdtotal+= " ";
    }

    if(qcontinued) continue; // read the next line

    if(cmdtotal.size() != 0) break;
    if(batchStream.eof()) break;
  }

  // strip again
  cmdtotal= cmdtotal.strip(G4String::both);

  // bypass some commands
  cmdtotal= BypassCommand(cmdtotal);

  // finally,
  if(batchStream.eof() && cmdtotal.size()==0) {
    return "exit";
  }

  return cmdtotal;
}


///////////////////////////////////////
G4UIsession* G4MPIbatch::SessionStart()
///////////////////////////////////////
{
  G4String newCommand="", scommand; // newCommand is always "" in slaves

  while(1) {
    if (isMaster) newCommand = ReadCommand();
    // broadcast a new G4 command
    scommand = g4MPI-> BcastCommand(newCommand);
    if(scommand == "exit") return 0;

    // just echo something
    if( scommand[(size_t)0] == '#') {
      if(G4UImanager::GetUIpointer()-> GetVerboseLevel()==2) {
        G4cout << scommand << G4endl;
      }
      continue;
    }

    G4int rc = ExecCommand(scommand);
    if (rc != fCommandSucceeded) {
      G4cerr << G4endl << "***** Batch is interupted!! *****" << G4endl;
      break;
    }
  }

  return 0;
}