/*
* This file is part of rasdaman community.
*
* Rasdaman community 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 3 of the License, or
* (at your option) any later version.
*
* Rasdaman community 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 rasdaman community.  If not, see <http://www.gnu.org/licenses/>.
*
* Copyright 2003, 2004, 2005, 2006, 2007, 2008, 2009 Peter Baumann /
rasdaman GmbH.
*
* For more information please see <http://www.rasdaman.org>
* or contact Peter Baumann via <baumann@rasdaman.com>.
/
/**
 * SOURCE: mitera.cc
 *
 * MODULE: raslib
 * CLASS:  r_MiterArea
 *
*/

#include "raslib/mitera.hh"
#include "raslib/minterval.hh"
#include "raslib/rmdebug.hh"

r_MiterArea::r_MiterArea( const r_Minterval* newIterDom, 
			  const r_Minterval* newImgDom ) throw(r_Error)
  : iterDom(newIterDom), imgDom(newImgDom), done(false)
{
  RMDBGENTER( 1, RMDebug::module_raslib, "r_MiterArea", "r_MiterArea()");

  if (imgDom->dimension() != iterDom->dimension())
  {
   //in this case we have an undefined situation
   RMInit::logOut << "r_MiterArea::rMiterArea(" << iterDom << ", " << imgDom << ") dimension mismatch" << endl;
   throw r_Error(INTERVALSWITHDIFFERENTDIMENSION);
  }
  
  if(!imgDom->is_origin_fixed() || 
     !imgDom->is_high_fixed())
  {
   //in this case we have an undefined situation
   RMInit::logOut << "r_MiterArea::rMiterArea(" << iterDom << ", " << imgDom << ") imgDom is opened" << endl;
   throw r_Error(INTERVALOPEN);
  }
  
  if(!iterDom->is_origin_fixed() || 
     !iterDom->is_high_fixed())
  {
   //in this case we have an undefined situation
   RMInit::logOut << "r_MiterArea::rMiterArea(" << iterDom << ", " << imgDom << ") iterDom is opened" << endl;
   throw r_Error(INTERVALOPEN);
  }
     

  // dimensionality of both iterDom and imgDom
  r_Dimension dim = imgDom->dimension();
  // stores the increments
  incArrIter = new incArrElem[dim];

  for(r_Dimension i=0; i<dim; i++ ) {
    // used for counting in iteration, initialize with 0
    incArrIter[i].curr = 0;
    // how often is the iterDom moved inside the imgDom
    incArrIter[i].repeat = (imgDom->get_extent()[i] / iterDom->get_extent()[i]) + 
      ( imgDom->get_extent()[i] % iterDom->get_extent()[i] != 0 );

    RMDBGMIDDLE( 4, RMDebug::module_raslib, "r_MiterArea", "repeat dim " << i << ": " << incArrIter[i].repeat );
  }
  reset();
  RMDBGEXIT( 1, RMDebug::module_raslib, "r_MiterArea", "r_MiterArea()" );
}


r_MiterArea::~r_MiterArea() 
{
  delete [] incArrIter;
}

void
r_MiterArea::reset()
{
  done = false;
  for( int i=0; i<iterDom->dimension(); i++ ) {
    incArrIter[i].curr = 0;
  }
}

r_Minterval 
r_MiterArea::nextArea()
{
  r_Dimension i = 0;

  if(done)
    return retVal;
  
  r_Minterval currDom(iterDom->dimension());

  // calculate new result domain here
  if(!done) {
    for(i=0; i < iterDom->dimension(); i++) {
      currDom << r_Sinterval( (*imgDom)[i].low() + incArrIter[i].curr*iterDom->get_extent()[i],
			      (*imgDom)[i].low() + (incArrIter[i].curr+1)*iterDom->get_extent()[i] 
                                                    - 1 );
    }
  }
  retVal = currDom.intersection_with((*imgDom));

  // increment dimensions
  for(i=0; i < iterDom->dimension(); i++) {
    incArrIter[i].curr++;
    if(incArrIter[i].curr < incArrIter[i].repeat) {
      // no overflow in this dimension
      break;
    } else {
      // overflow in this dimension
      incArrIter[i].curr = 0;
    }
  }
  if( i == iterDom->dimension() ) {
    // overflow in last dimension
    done = true;
  }
    
  return retVal;
}

bool 
r_MiterArea::isDone()
{
  return done;
}