/*
 * @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 "tapeserver/readtp/TapeFseqRange.hpp"
#include "common/exception/InvalidArgument.hpp"

#include <getopt.h>
#include <ostream>

#include <string.h>

namespace cta::tapeserver::readtp {

//------------------------------------------------------------------------------
// constructor
//------------------------------------------------------------------------------
TapeFseqRange::TapeFseqRange() noexcept {
  reset();
}

//------------------------------------------------------------------------------
// constructor
//------------------------------------------------------------------------------
TapeFseqRange::TapeFseqRange(const uint32_t lower, const uint32_t upper)  {

  reset(lower, upper);
}

//------------------------------------------------------------------------------
// reset
//------------------------------------------------------------------------------
void TapeFseqRange::reset() noexcept {
  m_isEmpty = true;
  m_lower   = 0; // Ignored
  m_upper   = 0; // Ignored
}


//------------------------------------------------------------------------------
// reset
//------------------------------------------------------------------------------
void TapeFseqRange::reset(const uint32_t lower,
  const uint32_t upper)  {

  if(lower == 0) {
    exception::InvalidArgument ex;

    ex.getMessage() << "Lower boundary must not be zero";
    throw ex;
  }

  // If the upper boundary is not 0 meaning infinity and the lower boundary is
  // greater than the upper boundary
  if(upper != 0 && lower > upper) {
    exception::InvalidArgument ex;

    ex.getMessage() <<
      "Lower boundary must be less than or equal to the upper boundary"
      ": lower=" << lower << " upper=" << upper;

    throw ex;
  }

  m_isEmpty = false;
  m_lower   = lower;
  m_upper   = upper;
}


//------------------------------------------------------------------------------
// isEmpty
//------------------------------------------------------------------------------
bool TapeFseqRange::isEmpty() const noexcept {
  return m_isEmpty;
}

//------------------------------------------------------------------------------
// lower
//------------------------------------------------------------------------------
uint32_t TapeFseqRange::lower() const noexcept {

  return m_isEmpty ? 0 : m_lower;
}

//------------------------------------------------------------------------------
// upper
//------------------------------------------------------------------------------
uint32_t TapeFseqRange::upper() const noexcept {

  return m_isEmpty ? 0 : m_upper;
}

//------------------------------------------------------------------------------
// size
//------------------------------------------------------------------------------
uint32_t TapeFseqRange::size() const noexcept {

  return m_isEmpty || m_upper == 0 ? 0 : m_upper - m_lower + 1;
}

} // namespace cta::tapeserver::readtp

//------------------------------------------------------------------------------
// ostream << operator for cta::tapeserver::readtp::TapeFseqRange
//------------------------------------------------------------------------------
std::ostream &operator<<(std::ostream &os,
  const cta::tapeserver::readtp::TapeFseqRange &value) {

  if(value.isEmpty()) {
    os << "EMPTY";
  } else {
    uint32_t lower = 0;
    uint32_t upper = 0;

    try {
      lower = value.lower();
      upper = value.upper();

      os << lower << "-";

      // An upper value of 0 means END of tape
      if(upper !=0) {
        os << upper;
      } else {
        os << "END";
      }
    } catch(cta::exception::Exception &ex) {
      os << "ERROR";
    }
  }

  return os;
}