/*
 * @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 "ConfigurationFile.hpp"
#include "common/exception/Exception.hpp"

#include <fstream>
#include <algorithm>

namespace cta { 
  
ConfigurationFile::ConfigurationFile(const std::string& path) {
  // Try to open the configuration file, throwing an exception if there is a
  // failure
  std::ifstream file(path);
  if (file.fail()) {
    cta::exception::Exception ex;
    ex.getMessage() << __FUNCTION__ << " failed"
      ": Failed to open configuration file"
      ": m_fileName=" << path;
    throw ex;
  }
  
  std::string line;
  size_t lineNumber=0;
  while(++lineNumber, std::getline(file, line)) {
    // get rid of potential tabs
    std::replace(line.begin(),line.end(),'\t',' ');
    // get the category
    std::istringstream sline(line);
    std::string category;
    if (!(sline >> category)) continue; // empty line
    if (category[0] == '#') continue;   // comment
    // get the key
    std::string key;
    if (!(sline >> key)) continue;      // no key on line
    if (key[0] == '#') continue;        // key commented
    // get and store value
    while (sline.get() == ' '){}; sline.unget(); // skip spaces
    std::string value;
    std::getline(sline, value, '#');
    value.erase(value.find_last_not_of(" \n\r\t")+1); // right trim
    auto & entry = entries[category][key];
    entry.value = value;
    entry.line = lineNumber;
  }
}

} // namespace cta