/**********************************************************************
 *
 * GEOS - Geometry Engine Open Source
 * http://geos.osgeo.org
 *
 * Copyright (C) 2009  Sandro Santilli <strk@kbt.io>
 *
 * This is free software; you can redistribute and/or modify it under
 * the terms of the GNU Lesser General Public Licence as published
 * by the Free Software Foundation.
 * See the COPYING file for more information.
 *
 **********************************************************************
 *
 * Last port: original work
 *
 **********************************************************************/

#include "SingleSidedBufferResultMatcher.h"

#include <geos/geom/Geometry.h>
#include <geos/algorithm/distance/DiscreteHausdorffDistance.h>

#include <cmath>

namespace geos {
namespace xmltester {

double SingleSidedBufferResultMatcher::MIN_DISTANCE_TOLERANCE = 1.0e-8;
double SingleSidedBufferResultMatcher::MAX_HAUSDORFF_DISTANCE_FACTOR = 100;

bool
SingleSidedBufferResultMatcher::isBufferResultMatch(const geom::Geometry& actualBuffer,
        const geom::Geometry& expectedBuffer,
        double distance)
{
    bool aEmpty = actualBuffer.isEmpty();
    bool eEmpty = expectedBuffer.isEmpty();

    // Both empty succeeds
    if(aEmpty && eEmpty) {
        return true;
    }

    // One empty and not the other is a failure
    if(aEmpty || eEmpty) {
        std::cerr << "isBufferResultMatch failed (one empty and one not)" << std::endl;
        return false;
    }


    // NOTE: we need to test hausdorff distance in both directions

    if(! isBoundaryHausdorffDistanceInTolerance(actualBuffer,
            expectedBuffer, distance)) {
        std::cerr << "isBoundaryHasudorffDistanceInTolerance failed (actual,expected)" << std::endl;
        return false;
    }

    if(! isBoundaryHausdorffDistanceInTolerance(expectedBuffer,
            actualBuffer, distance)) {
        std::cerr << "isBoundaryHasudorffDistanceInTolerance failed (expected,actual)" << std::endl;
        return false;
    }

    return true;
}

bool
SingleSidedBufferResultMatcher::isBoundaryHausdorffDistanceInTolerance(
    const geom::Geometry& actualBuffer,
    const geom::Geometry& expectedBuffer, double distance)
{
    typedef std::unique_ptr<geom::Geometry> GeomPtr;

    using geos::algorithm::distance::DiscreteHausdorffDistance;

    GeomPtr actualBdy(actualBuffer.clone());
    GeomPtr expectedBdy(expectedBuffer.clone());

    DiscreteHausdorffDistance haus(*actualBdy, *expectedBdy);
    haus.setDensifyFraction(0.25);

    double maxDistanceFound = haus.orientedDistance();

    double expectedDistanceTol = fabs(distance) / MAX_HAUSDORFF_DISTANCE_FACTOR;
    if(expectedDistanceTol < MIN_DISTANCE_TOLERANCE) {
        expectedDistanceTol = MIN_DISTANCE_TOLERANCE;
    }

    if(maxDistanceFound > expectedDistanceTol) {
        std::cerr << "maxDistanceFound: " << maxDistanceFound << " tolerated " << expectedDistanceTol << std::endl;
        return false;
    }

    return true;
}

} // namespace geos::xmltester
} // namespace geos