/*
 * @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 "Regex.hpp"
#include "common/exception/Exception.hpp"
#include <regex.h>

namespace cta::utils {

Regex::Regex(const std::string & re_str) : m_reStr(re_str), m_set(false) {
  if (int rc = ::regcomp(&m_re, m_reStr.c_str(), REG_EXTENDED)) {
    std::string error("Could not compile regular expression: \"");
    error += m_reStr;
    error += "\"";
    char re_err[1024];
    if (::regerror(rc, &m_re, re_err, sizeof (re_err))) {
      error += ": ";
      error += re_err;
    }
    throw cta::exception::Exception(error);
  }
  m_set = true;
}

Regex::Regex(const Regex& o) {
  Regex(o.m_reStr);
}

Regex::~Regex() {
  if (m_set)
    ::regfree(&m_re);
}

std::vector<std::string> Regex::exec(const std::string &s) const {
  regmatch_t matches[100];
  if (REG_NOMATCH != ::regexec(&m_re, s.c_str(), 100, matches, 0)) {
    std::vector<std::string> ret;
    for (int i = 0; i < 100; i++) {
      if (matches[i].rm_so != -1) {
        ret.push_back(s.substr(matches[i].rm_so, matches[i].rm_eo - matches[i].rm_so));
      } else
        break;
    }
    return ret;
  }
  return std::vector<std::string>();
}

} // namespace cta::utils