#include <cassert>
#include <cstdlib>
#include <iostream>

#include "cctk.h"
#include "cctk_Parameters.h"

#include "defs.hh"
#include "dh.hh"
#include "th.hh"

#include "gh.hh"

using namespace std;



  // Constructors
gh::gh (const int reffact_, const centering refcent_,
        const int mgfact_, const centering mgcent_,
        const ibbox baseextent_)
  : reffact(reffact_), refcent(refcent_),
    mgfact(mgfact_), mgcent(mgcent_),
    baseextent(baseextent_)
{
}

// Destructors
gh::~gh () { }

// Modifiers
void gh::recompose (const mexts& exts,
                    const rbnds& outer_bounds,
                    const rprocs& procs,
                    const bool do_prolongate)
{
  DECLARE_CCTK_PARAMETERS;
  
  _extents = exts;
  _outer_boundaries = outer_bounds;
  _processors = procs;
  
  // Consistency checks
  
  // nota bene: there might be 0 refinement levels.
  
  check_processor_number_consistency ();
  check_multigrid_consistency ();
  check_component_consistency ();
  check_base_grid_extent ();
  check_refinement_levels ();
  
  calculate_base_extents_of_all_levels ();
  
  if (output_bboxes) {
    do_output_bboxes (cout);
    do_output_bases (cout);
  }
  
  // Recompose the other hierarchies
  
  for (list<th*>::iterator t=ths.begin(); t!=ths.end(); ++t) {
    (*t)->recompose();
  }
  
  for (list<dh*>::iterator d=dhs.begin(); d!=dhs.end(); ++d) {
    (*d)->recompose (do_prolongate);
  }
}

void gh::check_processor_number_consistency ()
{
  for (int rl=0; rl<reflevels(); ++rl) {
    assert (processors().size() == extents().at(0).size());
    assert (outer_boundaries().size() == extents().at(0).size());
    for (int c=0; c<components(rl); ++c) {
      assert (processors().at(rl).size() == extents().at(0).at(rl).size());
      assert (outer_boundaries().at(rl).size() == extents().at(0).at(rl).size());
    }
  }
}
  
void gh::check_multigrid_consistency ()
{
  assert (mglevels()>0);
  for (int ml=1; ml<mglevels(); ++ml) {
    for (int rl=0; rl<reflevels(); ++rl) {
      for (int c=0; c<components(rl); ++c) {
	assert (all(extents().at(ml).at(rl).at(c).stride()
		    == ivect(mgfact) * extents().at(ml-1).at(rl).at(c).stride()));
        // TODO: put the check back in, taking outer boundaries into
        // account
#if 0
	assert (extents().at(ml).at(rl).at(c)
		.contracted_for(extents().at(ml-1).at(rl).at(c))
		.is_contained_in(extents().at(ml-1).at(rl).at(c)));
#endif
      }
    }
  }
}
  
void gh::check_component_consistency ()
{
  for (int ml=0; ml<mglevels(); ++ml) {
    for (int rl=0; rl<reflevels(); ++rl) {
      assert (components(rl)>0);
      for (int c=0; c<components(rl); ++c) {
        const ibbox &b  = extents().at(ml).at(rl).at(c);
        const ibbox &b0 = extents().at(ml).at(rl).at(0);
	assert (all(b.stride() == b0.stride()));
	assert (b.is_aligned_with(b0));
        for (int cc=c+1; cc<components(rl); ++cc) {
          assert ((b & extents().at(ml).at(rl).at(cc)).empty());
        }
      }
    }
  }
}

void gh::check_base_grid_extent ()
{
  if (reflevels()>0) {
    for (int c=0; c<components(0); ++c) {
      // TODO: put the check back in, taking outer boundaries into
      // account
#if 0
      assert (extents().at(0).at(c).at(0).is_contained_in(baseextent));
#endif
    }
  }
}
  
void gh::check_refinement_levels ()
{
  for (int ml=0; ml<mglevels(); ++ml) {
    for (int rl=1; rl<reflevels(); ++rl) {
      assert (all(extents().at(ml).at(rl-1).at(0).stride()
                  == ivect(reffact) * extents().at(ml).at(rl).at(0).stride()));
      // Check contained-ness:
      // first take all coarse grids ...
      ibset all;
      for (int c=0; c<components(rl-1); ++c) {
        all |= extents().at(ml).at(rl-1).at(c);
      }
      // ... remember their size ...
      const int sz = all.size();
      // ... then add the coarsified fine grids ...
      for (int c=0; c<components(rl); ++c) {
        all |= extents().at(ml).at(rl).at(c).contracted_for(extents().at(ml).at(rl-1).at(0));
      }
      // ... and then check the sizes:
      assert (all.size() == sz);
    }
  }
}

void gh::calculate_base_extents_of_all_levels ()
{
  _bases.resize(mglevels());
  for (int ml=0; ml<mglevels(); ++ml) {
    _bases.at(ml).resize(reflevels());
    for (int rl=0; rl<reflevels(); ++rl) {
      _bases.at(ml).at(rl) = ibbox();
      ibbox &bb = _bases.at(ml).at(rl);
      for (int c=0; c<components(rl); ++c) {
        bb = bb.expanded_containing(extents().at(ml).at(rl).at(c));
      }
    }
  }
}

// Accessors
int gh::local_components (const int rl) const
{
  int lc = 0;
  for (int c=0; c<components(rl); ++c) {
    if (is_local(rl,c)) ++lc;
  }
  return lc;
}



// Time hierarchy management
void gh::add (th* t)
{
  ths.push_back(t);
}

void gh::remove (th* t)
{
  ths.remove(t);
}



// Data hierarchy management
void gh::add (dh* d)
{
  dhs.push_back(d);
}

void gh::remove (dh* d)
{
  dhs.remove(d);
}


void gh::do_output_bboxes (ostream& os) const
{
  for (int ml=0; ml<mglevels(); ++ml) {
    for (int rl=0; rl<reflevels(); ++rl) {
      for (int c=0; c<components(rl); ++c) {
        os << endl;
        os << "gh bboxes:" << endl;
        os << "ml=" << ml << " rl=" << rl << " c=" << c << endl;
        os << "extent=" << extents().at(ml).at(rl).at(c) << endl;
        os << "outer_boundary=" << outer_boundaries().at(rl).at(c) << endl;
        os << "processor=" << processors().at(rl).at(c) << endl;
      }
    }
  }
}

void gh::do_output_bases (ostream& os) const
{
  for (int ml=0; ml<mglevels(); ++ml) {
    for (int rl=0; rl<reflevels(); ++rl) {
      if (components(rl)>0) {
        os << endl;
        os << "gh bases:" << endl;
        os << "ml=" << ml << " rl=" << rl << endl;
        os << "base=" << bases().at(ml).at(rl) << endl;
      }
    }
  }
}

ostream& gh::output (ostream& os) const
{
  os << "gh:"
     << "reffactor=" << reffact << ",refcentering=" << refcent << ","
     << "mgfactor=" << mgfact << ",mgcentering=" << mgcent << ","
     << "extents=" << extents() << ","
     << "outer_boundaries=" << outer_boundaries() << ","
     << "processors=" << processors() << ","
     << "dhs={";
  const char * sep = "";
  for (list<dh*>::const_iterator d = dhs.begin();
       d != dhs.end(); ++d)
  {
    os << sep;
    (*d)->output(os);
    sep = ",";
  }
  os << "}";
  return os;
}