#include <iostream>
#include <fstream>
#include <sstream>
#include <string>
#include <TChain.h>
#include <TString.h>

int main(int argc, char** argv)
{
  TString iFileName, iTreeName;

  if (argc < 5){
    std::cerr << "./get_dca -i filelist --tree-name TreeName" << std::endl;
    return 1;
  }

  for (int i=1; i<argc; i++){
    if(std::string(argv[i]) != "-i" &&
       std::string(argv[i]) != "--tree-name"){
      std::cerr << "\n[ERROR]: Unknown parameter " << i << ": " <<  argv[i] << std::endl;
      return 1;
    } else {
      if(std::string(argv[i]) == "-i" && i!=argc-1) {
        iFileName = argv[++i];
        continue;
      }
      if(std::string(argv[i]) == "-i" && i==argc-1) {
        std::cerr << "\n[ERROR]: Input file name was not specified " << std::endl;
        return 1;
      }
      if(std::string(argv[i]) == "--tree-name" && i!=argc-1) {
        iTreeName = argv[++i];
        continue;
      }
      if(std::string(argv[i]) == "--tree-name" && i==argc-1) {
        std::cerr << "\n[ERROR]: Tree name was not specified " << std::endl;
        return 1;
      }
    }
  }

  std::cout << "Processing count-data..." << std::endl;

  std::ifstream infile(iFileName.Data());
  std::string line;

  TChain *chain = new TChain(iTreeName.Data());
  int iFiles = 0;

  while (std::getline(infile, line))
  {
    chain->Add(line.c_str());
    iFiles++;
  }

  std::cout << iFiles << " files were processed." << std::endl;
  std::cout << "Total number of events:" << std::endl;
  Long64_t nEntries = chain->GetEntries();
  std::cout << nEntries << std::endl;
  std::cout << std::endl;

  return 0;
}