/*
 * @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 "common/exception/Exception.hpp"
#include "rdbms/wrapper/PostgresColumn.hpp"
#include "rdbms/wrapper/PostgresConn.hpp"

namespace cta::rdbms::wrapper {

//------------------------------------------------------------------------------
// constructor
//------------------------------------------------------------------------------
PostgresColumn::PostgresColumn(const std::string &colName, const size_t nbRows):
  m_colName(colName),
  m_nbRows(nbRows),
  m_fieldValues(nbRows,std::make_pair(false, std::string())) {
}

//------------------------------------------------------------------------------
// getColName
//------------------------------------------------------------------------------
const std::string &PostgresColumn::getColName() const {
  return m_colName;
}

//------------------------------------------------------------------------------
// getNbRows
//------------------------------------------------------------------------------
size_t PostgresColumn::getNbRows() const {
  return m_nbRows;
}

//------------------------------------------------------------------------------
// setFieldByteA
//------------------------------------------------------------------------------
void PostgresColumn::setFieldByteA(rdbms::Conn &conn, const size_t index, const std::string &value) {
  auto pgconn_ptr = dynamic_cast<PostgresConn*>(conn.getConnWrapperPtr());
  auto pgconn = pgconn_ptr->get();

  size_t escaped_length;
  auto escapedByteA = PQescapeByteaConn(pgconn, reinterpret_cast<const unsigned char*>(value.c_str()),
    value.length(), &escaped_length);
  std::string escapedStr(reinterpret_cast<const char*>(escapedByteA), escaped_length);
  PQfreemem(escapedByteA);

  copyStrIntoField(index, escapedStr);
}

//------------------------------------------------------------------------------
// getValue
//------------------------------------------------------------------------------
const char *PostgresColumn::getValue(size_t index) const {
  try {
    if(index >= m_nbRows) {
      exception::Exception ex;
      ex.getMessage() << "Field index is outside the available rows:"
        " index=" << index << " m_nbRows=" << m_nbRows;
      throw ex;
    }
    if (m_fieldValues[index].first) {
      return m_fieldValues[index].second.c_str();
    } else {
      return nullptr;
    }
  } catch(exception::Exception &ex) {
    throw exception::Exception(std::string(__FUNCTION__) + " failed: colName=" + m_colName + ": " +
      ex.getMessage().str());
  }
}

//------------------------------------------------------------------------------
// copyStrIntoField
//------------------------------------------------------------------------------
void PostgresColumn::copyStrIntoField(const size_t index, const std::string &str) {
  try {
    if(index >= m_nbRows) {
      exception::Exception ex;
      ex.getMessage() << "Field index is outside the available rows:"
        " index=" << index << " m_nbRows=" << m_nbRows;
      throw ex;
    }
    m_fieldValues[index].first = true;
    m_fieldValues[index].second = str;
  } catch(exception::Exception &ex) {
    throw exception::Exception(std::string(__FUNCTION__) + " failed: colName=" + m_colName + ": " +
      ex.getMessage().str());
  }
}

} // namespace cta::rdbms::wrapper