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/* -*- C++ -*-
 *
 * This file is a part of LEMON, a generic C++ optimization library
 *
 * Copyright (C) 2003-2008
 * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
 * (Egervary Research Group on Combinatorial Optimization, EGRES).
 *
 * Permission to use, modify and distribute this software is granted
 * provided that this copyright notice appears in all copies. For
 * precise terms see the accompanying LICENSE file.
 *
 * This software is provided "AS IS" with no warranty of any kind,
 * express or implied, and with no claim as to its suitability for any
 * purpose.
 *
 */

#ifndef LEMON_ASSERT_H
#define LEMON_ASSERT_H

/// \ingroup exceptions
/// \file
/// \brief Extended assertion handling

#include <lemon/error.h>

namespace lemon {

  inline void assert_fail_log(const char *file, int line, const char *function,
			      const char *message, const char *assertion)
  {
    std::cerr << file << ":" << line << ": ";
    if (function)
      std::cerr << function << ": ";
    std::cerr << message;
    if (assertion)
      std::cerr << " (assertion '" << assertion << "' failed)";
    std::cerr << std::endl;
  }

  inline void assert_fail_abort(const char *file, int line,
				const char *function, const char* message,
				const char *assertion)
  {
    assert_fail_log(file, line, function, message, assertion);
    std::abort();
  }

  namespace _assert_bits {
    
    
    inline const char* cstringify(const std::string& str) {
      return str.c_str();
    }

    inline const char* cstringify(const char* str) {
      return str;
    }    
  }
}

#endif // LEMON_ASSERT_H

#undef LEMON_ASSERT
#undef LEMON_FIXME
#undef LEMON_DEBUG

#if (defined(LEMON_ASSERT_LOG) ? 1 : 0) +		\
  (defined(LEMON_ASSERT_ABORT) ? 1 : 0) +		\
  (defined(LEMON_ASSERT_CUSTOM) ? 1 : 0) > 1
#error "LEMON assertion system is not set properly"
#endif

#if ((defined(LEMON_ASSERT_LOG) ? 1 : 0) +		\
     (defined(LEMON_ASSERT_ABORT) ? 1 : 0) +		\
     (defined(LEMON_ASSERT_CUSTOM) ? 1 : 0) == 1 ||	\
     defined(LEMON_ENABLE_ASSERTS)) &&			\
  (defined(LEMON_DISABLE_ASSERTS) ||			\
   defined(NDEBUG))
#error "LEMON assertion system is not set properly"
#endif


#if defined LEMON_ASSERT_LOG
#  undef LEMON_ASSERT_HANDLER
#  define LEMON_ASSERT_HANDLER ::lemon::assert_fail_log
#elif defined LEMON_ASSERT_ABORT
#  undef LEMON_ASSERT_HANDLER
#  define LEMON_ASSERT_HANDLER ::lemon::assert_fail_abort
#elif defined LEMON_ASSERT_CUSTOM
#  undef LEMON_ASSERT_HANDLER
#  ifndef LEMON_CUSTOM_ASSERT_HANDLER
#    error "LEMON_CUSTOM_ASSERT_HANDLER is not set"
#  endif
#  define LEMON_ASSERT_HANDLER LEMON_CUSTOM_ASSERT_HANDLER
#elif defined LEMON_DISABLE_ASSERTS
#  undef LEMON_ASSERT_HANDLER
#elif defined NDEBUG
#  undef LEMON_ASSERT_HANDLER
#else
#  define LEMON_ASSERT_HANDLER ::lemon::assert_fail_abort
#endif

#ifndef LEMON_FUNCTION_NAME
#  define LEMON_FUNCTION_NAME (__PRETTY_FUNCTION__)
#endif

#ifdef DOXYGEN

/// \ingroup exceptions
///
/// \brief Macro for assertion with customizable message
///
/// Macro for assertion with customizable message.  \param exp An
/// expression that must be convertible to \c bool.  If it is \c
/// false, then an assertion is raised. The concrete behaviour depends
/// on the settings of the assertion system.  \param msg A <tt>const
/// char*</tt> parameter, which can be used to provide information
/// about the circumstances of the failed assertion.
///
/// The assertions are enabled in the default behaviour.
/// You can disable them with the following code:
/// \code
/// #define LEMON_DISABLE_ASSERTS
/// \endcode
/// or with compilation parameters:
/// \code
/// g++ -DLEMON_DISABLE_ASSERTS
/// make CXXFLAGS='-DLEMON_DISABLE_ASSERTS'
/// \endcode
/// The checking is also disabled when the standard macro \c NDEBUG is defined.
/// 
/// The LEMON assertion system has a wide range of customization
/// properties. As a default behaviour the failed assertion prints a
/// short log message to the standard error and aborts the execution.
///
/// The following modes can be used in the assertion system: 
///
/// - \c LEMON_ASSERT_LOG The failed assertion prints a short log
///   message to the standard error and continues the execution.
/// - \c LEMON_ASSERT_ABORT This mode is similar to the \c
///   LEMON_ASSERT_LOG, but it aborts the program. It is the default
///   behaviour.
/// - \c LEMON_ASSERT_CUSTOM The user can define own assertion handler
///   function.
///   \code
///     void custom_assert_handler(const char* file, int line, const char* function,
///                                const char* message, const char* assertion);
///   \endcode
///   The name of the function should be defined as the \c
///   LEMON_CUSTOM_ASSERT_HANDLER macro name. 
///   \code
///     #define LEMON_CUSTOM_ASSERT_HANDLER custom_assert_handler
///   \endcode
///   Whenever an assertion is occured, the custom assertion
///   handler is called with appropiate parameters.
///
/// The assertion mode can also be changed within one compilation unit.
/// If the macros are redefined with other settings and the
/// \ref lemon/assert.h "assert.h" file is reincluded, then the
/// behaviour is changed appropiately to the new settings.
#  define LEMON_ASSERT(exp, msg)					\
  (static_cast<void> (!!(exp) ? 0 : (					\
    LEMON_ASSERT_HANDLER(__FILE__, __LINE__,				\
			 LEMON_FUNCTION_NAME,				\
			 ::lemon::_assert_bits::cstringify(msg), #exp), 0)))

/// \ingroup exceptions
///
/// \brief Macro for mark not yet implemented features.
///
/// Macro for mark not yet implemented features and outstanding bugs.
/// It is close to be the shortcut of the following code:
/// \code
///   LEMON_ASSERT(false, msg);
/// \endcode
///
/// \see LEMON_ASSERT 
#  define LEMON_FIXME(msg)						\
  (LEMON_ASSERT_HANDLER(__FILE__, __LINE__, LEMON_FUNCTION_NAME,	\
			::lemon::_assert_bits::cstringify(msg),		\
			static_cast<const char*>(0)))

/// \ingroup exceptions
///
/// \brief Macro for internal assertions
///
/// Macro for internal assertions, it is used in the library to check
/// the consistency of results of algorithms, several pre- and
/// postconditions and invariants. The checking is disabled by
/// default, but it can be turned on with the macro \c
/// LEMON_ENABLE_DEBUG.
/// \code
/// #define LEMON_ENABLE_DEBUG
/// \endcode
/// or with compilation parameters:
/// \code
/// g++ -DLEMON_ENABLE_DEBUG
/// make CXXFLAGS='-DLEMON_ENABLE_DEBUG'
/// \endcode
///
/// This macro works like the \c LEMON_ASSERT macro, therefore the
/// current behaviour depends on the settings of \c LEMON_ASSERT
/// macro.
///
/// \see LEMON_ASSERT 
#  define LEMON_DEBUG(exp, msg)						\
  (static_cast<void> (!!(exp) ? 0 : (					\
    LEMON_ASSERT_HANDLER(__FILE__, __LINE__,                            \
			 LEMON_FUNCTION_NAME,				\
			 ::lemon::_assert_bits::cstringify(msg), #exp), 0)))

#else

#  ifndef LEMON_ASSERT_HANDLER
#    define LEMON_ASSERT(exp, msg)  (static_cast<void>(0))
#    define LEMON_FIXME(msg) (static_cast<void>(0))
#    define LEMON_DEBUG(exp, msg) (static_cast<void>(0))
#  else
#    define LEMON_ASSERT(exp, msg)					\
       (static_cast<void> (!!(exp) ? 0 : (				\
        LEMON_ASSERT_HANDLER(__FILE__, __LINE__,                        \
			     LEMON_FUNCTION_NAME,			\
			     ::lemon::_assert_bits::cstringify(msg),	\
			     #exp), 0)))
#    define LEMON_FIXME(msg)						\
       (LEMON_ASSERT_HANDLER(__FILE__, __LINE__, LEMON_FUNCTION_NAME,	\
			     ::lemon::_assert_bits::cstringify(msg),	\
			     static_cast<const char*>(0)))

#    if LEMON_ENABLE_DEBUG
#      define LEMON_DEBUG(exp, msg)
         (static_cast<void> (!!(exp) ? 0 : (         \
           LEMON_ASSERT_HANDLER(__FILE__, __LINE__,  \
                                LEMON_FUNCTION_NAME, \
				::lemon::_assert_bits::cstringify(msg),	\
				#exp), 0)))
#    else
#      define LEMON_DEBUG(exp, msg) (static_cast<void>(0))
#    endif
#  endif

#endif

#ifdef DOXYGEN


#else


#endif