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//=============================================================================
//  AL
//  Audio Utility Library
//  $Id:$
//
//  Copyright (C) 2002-2006 by Werner Schweer and others
//
//  This program is free software; you can redistribute it and/or modify
//  it under the terms of the GNU General Public License version 2.
//
//  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., 675 Mass Ave, Cambridge, MA 02139, USA.
//=============================================================================

#ifndef __SIG_H__
#define __SIG_H__

namespace AL {

#ifndef MAX_TICK
#define MAX_TICK (0x7fffffff/100)
#endif

class Xml;

//---------------------------------------------------------
//   TimeSignature
//---------------------------------------------------------

struct TimeSignature {
      int z, n;
      TimeSignature() { z = 4; n = 4; }
      TimeSignature(int a, int b) { z = a; n = b; }
      };

//---------------------------------------------------------
//   Signature Event
//---------------------------------------------------------

struct SigEvent {
      TimeSignature sig;
      unsigned tick;    // signature valid from this position
      int bar;          // precomputed

      int read(QDomNode);
      void write(Xml&, int) const;

      SigEvent() { }
      SigEvent(const TimeSignature& s, unsigned tk) {
            sig = s;
            tick = tk;
            bar = 0;
            }
      };

//---------------------------------------------------------
//   SigList
//---------------------------------------------------------

typedef std::map<unsigned, SigEvent*, std::less<unsigned> > SIGLIST;
typedef SIGLIST::iterator iSigEvent;
typedef SIGLIST::const_iterator ciSigEvent;
typedef SIGLIST::reverse_iterator riSigEvent;
typedef SIGLIST::const_reverse_iterator criSigEvent;

class SigList : public SIGLIST {
      int ticks_beat(int N) const;
      void normalize();
      int ticksMeasure(const TimeSignature&) const;

   public:
      SigList();
      void clear();
      void add(unsigned tick, const TimeSignature& s);
      void del(unsigned tick);

      void read(QDomNode);
      void write(Xml&) const;
      void dump() const;

      TimeSignature timesig(unsigned tick) const;
      void tickValues(unsigned t, int* bar, int* beat, unsigned* tick) const;
      unsigned bar2tick(int bar, int beat, unsigned tick) const;

      int ticksMeasure(unsigned tick) const;
      int ticksBeat(unsigned tick) const;
      unsigned raster(unsigned tick, int raster) const;
      unsigned raster1(unsigned tick, int raster) const;    // round down
      unsigned raster2(unsigned tick, int raster) const;    // round up
      int rasterStep(unsigned tick, int raster) const;
      };

extern SigList sigmap;

}

#endif