/*!
 * \file
 * \brief Error handling functions - header file
 * \author Tobias Ringstrom and Adam Piatyszek
 *
 * -------------------------------------------------------------------------
 *
 * IT++ - C++ library of mathematical, signal processing, speech processing,
 *        and communications classes and functions
 *
 * Copyright (C) 1995-2007  (see AUTHORS file for a list of contributors)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 *
 * -------------------------------------------------------------------------
 */

#ifndef ITASSERT_H
#define ITASSERT_H

#ifndef _MSC_VER
#  include <itpp/config.h>
#else
#  include <itpp/config_msvc.h>
#endif

#include <sstream>
#include <string>


namespace itpp {

  /*!
    \addtogroup errorhandlingfunc

    For the following macros, the argument \c s is a string that is displayed.

    \code
    it_assert(t,s);           // Abort if t is not true
    it_assert_debug(t,s);     // Abort if t is not true and NDEBUG is not defined
    it_error_if(t,s);         // Abort if t is true
    it_error(s);              // Abort
    it_info(s);               // Display a message
    it_info_debug(s);         // Display a message if NDEBUG is not defined
    it_info_no_endl(s);       // Display a message without appended "std::endl"
    it_info_no_endl_debug(s); // Display a message without appended "std::endl" if NDEBUG is not defined
    it_warning(s);            // Display a warning
    \endcode

    \c it_assert(), \c it_error(), \c it_error_if(), \c it_info(), \c
    it_info_no_endl() and \c it_warning() are always active, whereas \c
    it_assert_debug(), \c it_info_debug() and \c it_info_no_endl_debug()
    depends on the \c NDEBUG compile time definition. If \c NDEBUG is
    defined, then none of these macros is executed.

    \note \c it_assert0() and \c it_assert1() macros are still defined for
    backward compatibility, but \c it_assert_debug() should be used instead
    of them.
  */
  //!@{

  //! Helper function for the \c it_assert and \c it_assert_debug macros
  void it_assert_f(std::string ass, std::string msg, std::string file, int line);
  //! Helper function for the \c it_error and \c it_error_if macros
  void it_error_f(std::string msg, std::string file, int line);
  //! Helper function for the \c it_info and \c it_info_debug macros
  void it_info_f(std::string msg);
  //! Helper function for the \c it_warning macro
  void it_warning_f(std::string msg, std::string file, int line);

  //! Enable/disable using exceptions for error handling.
  void it_enable_exceptions(bool on);
  //! Enable warnings
  void it_enable_warnings();
  //! Disable warnings
  void it_disable_warnings();
  //! Redirect warnings to the ostream warn_stream
  void it_redirect_warnings(std::ostream *warn_stream);

  //! Style of assert, error and warning messages.
  enum error_msg_style { Full, Minimum };

  //! Set preffered style of assert, error and warning messages
  void it_error_msg_style(error_msg_style style);


  //! Abort if \c t is not true
#define it_assert(t,s)						\
  if (!(t)) {							\
    std::ostringstream m_sout;					\
    m_sout << s;						\
    itpp::it_assert_f(#t,m_sout.str(),__FILE__,__LINE__);	\
  } else							\
    ((void) 0)

#if defined(NDEBUG)
  //! Abort if \c t is not true and NDEBUG is not defined
#  define it_assert_debug(t,s) ((void) 0)
#else
  //! Abort if \c t is not true and NDEBUG is not defined
#  define it_assert_debug(t,s) it_assert(t,s)
#endif // if defined(NDEBUG)

  //! Deprecated macro. Please use \c it_assert_debug() instead.
#define it_assert0(t,s) it_assert_debug(t,s)
  //! Deprecated macro. Please use \c it_assert_debug() instead.
#define it_assert1(t,s) it_assert_debug(t,s)


  //! Abort if \c t is true
#define it_error_if(t,s)				\
  if((t)) {						\
    std::ostringstream m_sout;				\
    m_sout << s;					\
    itpp::it_error_f(m_sout.str(),__FILE__,__LINE__);	\
  } else						\
    ((void) 0)

  //! Abort unconditionally
#define it_error(s)					\
  if (true) {						\
    std::ostringstream m_sout;				\
    m_sout << s;					\
    itpp::it_error_f(m_sout.str(),__FILE__,__LINE__);	\
  } else						\
    ((void) 0)


  //! Print information message
#define it_info(s)				\
  if (true) {					\
    std::ostringstream m_sout;			\
    m_sout << s << std::endl;			\
    itpp::it_info_f(m_sout.str());		\
  } else					\
    ((void) 0)

  //! Print information message withot \c std::endl at the end
#define it_info_no_endl(s)			\
  if (true) {					\
    std::ostringstream m_sout;			\
    m_sout << s;				\
    itpp::it_info_f(m_sout.str());		\
  } else					\
    ((void) 0)

#if defined(NDEBUG)
  //! Print information message if NDEBUG is not defined
#  define it_info_debug(s) ((void) 0)
  /*!
    \brief Print information message withot \c std::endl at the end if
    NDEBUG is not defined
  */
#  define it_info_no_endl_debug(s) ((void) 0)
#else
  //! Print information message if NDEBUG is not defined
#  define it_info_debug(s) it_info(s)
  /*!
    \brief Print information message withot \c std::endl at the end if
    NDEBUG is not defined
  */
#  define it_info_no_endl_debug(s) it_info_no_endl(s)
#endif // if defined(NDEBUG)


  //! Display a warning message
#define it_warning(s)					\
  if (true) {						\
    std::ostringstream m_sout;				\
    m_sout << s;					\
    itpp::it_warning_f(m_sout.str(),__FILE__,__LINE__); \
  } else						\
    ((void) 0)

  //!@}

} // namespace itpp

#endif // #ifndef ITASSERT_H