/* -*- mia-c++  -*-
 *
 * This file is part of MIA - a toolbox for medical image analysis
 * Copyright (c) Leipzig, Madrid 1999-2017 Gert Wollny
 *
 * MIA 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.
 *
 * 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 MIA; if not, see <http://www.gnu.org/licenses/>.
 *
 */

#include <mia/internal/plugintester.hh>
#include <mia/2d/cost/ncc.hh>
#include <mia/core/nccsum.hh>

using namespace NS;
using namespace mia;




BOOST_AUTO_TEST_CASE( test_gncc_zero )
{
       C2DBounds size(4, 4);
       auto ncc = BOOST_TEST_create_from_plugin<CNCC2DImageCostPlugin>("gncc");
       C2DFImage a(size);
       C2DFImage b(size);
       auto ia = a.begin_range(C2DBounds::_0, size);
       auto ib = b.begin_range(C2DBounds::_0, size);
       auto ea = a.end_range(C2DBounds::_0, size);

       while (ia != ea) {
              *ia = ia.pos().x + ia.pos().y;
              *ib = 2 * *ia;
              ++ib;
              ++ia;
       }

       ncc->set_reference(b);
       BOOST_CHECK_SMALL(ncc->value(b), 1e-7);
       BOOST_CHECK_SMALL(ncc->value(a), 1e-7);
}


BOOST_AUTO_TEST_CASE( test_ncc_nonzero )
{
       C2DBounds size(4, 4);
       auto ncc = BOOST_TEST_create_from_plugin<CNCC2DImageCostPlugin>("gncc");
       C2DFImage a(size);
       C2DFImage b(size);
       auto ia = a.begin_range(C2DBounds::_0, size);
       auto ib = b.begin_range(C2DBounds::_0, size);
       auto ea = a.end_range(C2DBounds::_0, size);
       NCCSums sum;

       while (ia != ea) {
              *ia = ia.pos().x + ia.pos().y;
              *ib = ia.pos().x * ia.pos().y;
              sum.add(*ia, *ib);
              ++ib;
              ++ia;
       }

       ncc->set_reference(b);
       BOOST_CHECK_CLOSE(ncc->value(a), sum.value(), 0.1);
       C2DFVectorfield grad(size);
       BOOST_CHECK_CLOSE(ncc->evaluate_force(a, grad), sum.value(), 0.01);
       auto ag = get_gradient(a);
       auto iag = ag.begin();
       auto ia2 = a.begin();
       auto ib2 = b.begin();
       auto iforce = grad.begin();
       auto eforce = grad.end();
       auto gs = sum.get_grad_helper().second;

       while (iforce != eforce) {
              auto expect = *iag * gs.get_gradient_scale(*ia2, *ib2);
              BOOST_CHECK_CLOSE(iforce->x, expect.x, 0.01);
              BOOST_CHECK_CLOSE(iforce->y, expect.y, 0.01);
              ++iag;
              ++ia2;
              ++ib2;
              ++iforce;
       }
}
