/*
 * @project      The CERN Tape Archive (CTA)
 * @copyright    Copyright © 2021-2022 CERN
 * @license      This program is free software, distributed under the terms of the GNU General Public
 *               Licence version 3 (GPL Version 3), copied verbatim in the file "COPYING". You can
 *               redistribute it and/or modify it under the terms of the GPL Version 3, or (at your
 *               option) any later version.
 *
 *               This program is distributed in the hope that it will be useful, but WITHOUT ANY
 *               WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
 *               PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 *               In applying this licence, CERN does not waive the privileges and immunities
 *               granted to it by virtue of its status as an Intergovernmental Organization or
 *               submit itself to any jurisdiction.
 */

#include <getopt.h>

#include <ostream>

#include "StatisticsUpdateCmdLineArgs.hpp"
#include "common/exception/CommandLineNotParsed.hpp"


namespace cta::statistics {

//------------------------------------------------------------------------------
// constructor
//------------------------------------------------------------------------------
StatisticsUpdateCmdLineArgs::StatisticsUpdateCmdLineArgs(const int argc, char *const *const argv):
  help(false) {
  static struct option longopts[] = {
    {"help", no_argument, nullptr, 'h'},
    {nullptr  ,           0, nullptr,   0}
  };

  // Prevent getopt() from printing an error message if it does not recognize
  // an option character
  opterr = 0;

  int opt = 0;
  while ((opt = getopt_long(argc, argv, ":h", longopts, nullptr)) != -1) {
    switch (opt) {
      case 'h':
        help = true;
        break;
      case ':':  // Missing parameter
      {
        exception::CommandLineNotParsed ex;
        ex.getMessage() << "The -" << static_cast<char>(optopt) << " option requires a parameter";
        throw ex;
      }
      case '?':  // Unknown option
      {
        exception::CommandLineNotParsed ex;
        if (0 == optopt) {
          ex.getMessage() << "Unknown command-line option";
        } else {
          ex.getMessage() << "Unknown command-line option: -" << static_cast<char>(optopt);        }
        throw ex;
      }
      default:
      {
        exception::CommandLineNotParsed ex;
        ex.getMessage() <<
          "getopt_long returned the following unknown value: 0x" <<
          std::hex << static_cast<int>(opt);
        throw ex;
      }
    }  // switch(opt)
  }  // while getopt_long()

  // There is no need to continue parsing when the help option is set
  if (help) {
    return;
  }

  // Calculate the number of non-option ARGV-elements
  const int nbArgs = argc - optind;

  // Check the number of arguments
  if (nbArgs != 1) {
    exception::CommandLineNotParsed ex;
    ex.getMessage() << "Wrong number of command-line arguments: expected=1 actual=" << nbArgs;
    throw ex;
  }

  catalogueDbConfigPath = argv[optind];
}

//------------------------------------------------------------------------------
// printUsage
//------------------------------------------------------------------------------
void StatisticsUpdateCmdLineArgs::printUsage(std::ostream &os) {
  os <<
    "Usage:" << std::endl <<
    "    cta-statistics-update databaseConnectionFile [options]" << std::endl <<
    "Where:" << std::endl <<
    "    databaseConnectionFile" << std::endl <<
    "        The path to the file containing the connection details of the CTA" << std::endl <<
    "        catalogue database" << std::endl <<
    "Options:" << std::endl <<
    "    -h,--help" << std::endl <<
    "        Prints this usage message" << std::endl;
}

} // namespace cta::statistics