/***************************************************************************
copyright            : (C) 2006 by David Nolden
email                : david.nolden.kdevelop@art-master.de
***************************************************************************/
/***************************************************************************
 *                                                                         *
 *   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.                                   *
 *                                                                         *
 ***************************************************************************/
#ifndef __COMPLETIONDEBUG_H__
#define __COMPLETIONDEBUG_H__

///With verbose shut on, the whole type-resolution-process is nicely traced for easy debugging(at cost of speed).
//#define VERBOSE
//#define VERBOSEMAJOR

///When defined, a backtrace is printed the first time the maximum depth is reached for the first time.
//#define DEPTHBACKTRACE

#include <tqstringlist.h>
#include <kdebug.h>

namespace CompletionDebug {
template <class StreamType>
class KDDebugState {
  private:
    StreamType m_stream;
    kndbgstream m_nstream;
    TQStringList m_prefixStack;
    int m_counter;
    int m_depth;
    bool m_enabled;
		bool m_hadWarning;

  public:
    typedef StreamType KStreamType;
    KDDebugState();

		KDDebugState( StreamType stream ) : m_stream( stream ), m_counter( 0 ), m_depth( 0 ), m_enabled( true ), m_hadWarning( false ) {}

    void push( const TQString & txt ) {
      m_prefixStack.push_back( txt );
      pushDepth();
    }

    void pop() {
      m_prefixStack.pop_back();
      popDepth();
    };

    inline void pushDepth() {
      m_depth++;
    }

    inline void popDepth() {
      m_depth--;
    }

		bool hadWarning() {
			return m_hadWarning;
		}

		void setHadWarning( bool had ) {
			m_hadWarning = had;
		}

    StreamType& dbg() {
#ifndef VERBOSE
      if ( !m_enabled )
        return m_nstream;
#endif

      m_stream << "(" << m_counter << ")";
      for ( TQStringList::iterator it = m_prefixStack.begin(); it != m_prefixStack.end() ; ++it )
        m_stream << *it;

      m_counter++;
      return m_stream;
    }

    void setState( bool enabled ) {
      m_enabled = enabled;
    }

    bool state() {
      return m_enabled;
    }

#ifndef NDEBUG
    void outputPrefix( kdbgstream& target ) {
      target << "(" << m_counter << ")";
      for ( TQStringList::iterator it = m_prefixStack.begin(); it != m_prefixStack.end() ; ++it )
        target << *it;

      m_counter++;
    }
#endif

    void clearCounter() {
      m_counter = 0;
    }

    int depth() {
      return m_depth;
    }
};
#ifndef NDEBUG
template <>
KDDebugState<kdbgstream>::KDDebugState();
#endif
template <>
KDDebugState<kndbgstream>::KDDebugState();
#if defined(VERBOSE) && !defined(NDEBUG)
typedef KDDebugState<kdbgstream> DBGStreamType;
#else
typedef KDDebugState<kndbgstream> DBGStreamType;
#endif
///Class to help indent the debug-output correctly
extern DBGStreamType dbgState;
extern const int completionMaxDepth;
class LogDebug {
  private:
    DBGStreamType& m_state;
    int m_max;
  public:
    LogDebug( const char* prefix = "#", int max = completionMaxDepth, DBGStreamType& st = dbgState ) : m_state( st ), m_max( max ) {
      m_state.push( prefix );
    };
    ~LogDebug() {
      m_state.pop();
    }

    DBGStreamType::KStreamType& dbg() {
      return m_state.dbg();
    }

    int depth() {
      return m_state.depth();
    }

    operator bool() {
      bool r = depth() < m_max;

	    if ( !r && !m_state.hadWarning() ) {
		    m_state.setHadWarning( true );
		    dbg() << "recursion is too deep" << endl;
#ifdef DEPTHBACKTRACE
        kdDebug( 9007 ) << kdBacktrace() << endl;
#endif
      }
      return r;
    }
};


///does not care about the logging, but still counts the depth
class DepthDebug {
    DBGStreamType& m_state;
    int m_max;
  public:
    DepthDebug( const char* prefix = "#", int max = completionMaxDepth, DBGStreamType& st = dbgState ) : m_state( st ), m_max( max ) {
      Q_UNUSED( prefix );
      m_state.pushDepth();
    };

    ~DepthDebug() {
      m_state.popDepth();
    }

    kndbgstream dbg() {
      return kndDebug();
    }

    int depth() {
      return m_state.depth();
    }

    operator bool() {
      bool r = depth() < m_max;

	    if ( !r && !m_state.hadWarning() ) {
		    m_state.setHadWarning( true );
		    dbg() << "recursion is too deep" << endl;
#ifdef DEPTHBACKTRACE
		    kdDebug( 9007 ) << kdBacktrace() << endl;
#endif
	    }
	    return r;
    }
};

#ifndef VERBOSEMAJOR
#define ifVerboseMajor(x) /**/
#else
#define ifVerboseMajor(x) x
#endif

bool dbgActive();

#ifdef VERBOSE

typedef LogDebug Debug;
DBGStreamType::KStreamType& dbg();
#define ifVerbose( x) {if( dbgActive() ) {x;}}
#else

DBGStreamType::KStreamType& dbg();
typedef DepthDebug Debug;
#define ifVerbose(x) /**/
#endif
#ifndef NDEBUG
kdbgstream dbgMajor();
#else
kndbgstream dbgMajor();
#endif
}
#endif