//
// Test Suite for Area::ofRingSigned() function

// tut
#include <tut/tut.hpp>
// geos
#include <geos/algorithm/Area.h>
#include <geos/geom/Polygon.h>
#include <geos/geom/Geometry.h>
#include <geos/geom/CoordinateSequence.h>
#include <geos/geom/Coordinate.h>
#include <geos/io/WKTReader.h>
#include <geos/io/WKBReader.h>
// std
#include <string>
#include <memory>
#include <cassert>
#include <sstream>

using namespace geos::algorithm;

namespace tut {
//
// Test Group
//

struct test_signedarea_data {
    typedef std::unique_ptr<geos::geom::Geometry> GeometryPtr;

    std::unique_ptr<geos::geom::CoordinateSequence> cs_;
    geos::io::WKTReader reader_;
    geos::io::WKBReader breader_;

    test_signedarea_data()
        : cs_(nullptr)
    {
        assert(nullptr == cs_);
    }

    ~test_signedarea_data()
    {
    }
};

typedef test_group<test_signedarea_data> group;
typedef group::object object;

group test_signedarea_group("geos::algorithm::CGAlgorithms::signedArea");

//
// Test Cases
//

// 1 - clockwise oriented
template<>
template<>
void object::test<1>
()
{
    const std::string wkt("POLYGON ((60 180, 140 240, 140 240, 140 240, 200 180, 120 120, 60 180))");
    GeometryPtr geom(reader_.read(wkt));

    cs_ = geom->getCoordinates();
    double area = Area::ofRingSigned(cs_.get());

    ensure_equals(area, 8400);
}

// 2 - counter-clockwise oriented
template<>
template<>
void object::test<2>
()
{
    const std::string wkt("POLYGON ((60 180, 140 120, 100 180, 140 240, 60 180))");
    GeometryPtr geom(reader_.read(wkt));

    cs_ = geom->getCoordinates();
    double area = Area::ofRingSigned(cs_.get());

    ensure_equals(area, -2400);
}

// 3 - Test the same polygon as in test No 2 but with duplicated top point
template<>
template<>
void object::test<3>
()
{
    const std::string wkt("POLYGON ((60 180, 140 120, 100 180, 140 240, 140 240, 60 180))");
    GeometryPtr geom(reader_.read(wkt));

    cs_ = geom->getCoordinates();
    double area = Area::ofRingSigned(cs_.get());

    ensure_equals(area, -2400);
}


} // namespace tut