/*------------------------------------------------------------------------------
 *	Copyright (c) 2023 by Bai Bing (seread@163.com)
 *	See COPYING file for copying and redistribution conditions.
 *
 *  Alians IT Studio.
 *----------------------------------------------------------------------------*/
#pragma once

#include "_Define.h"
#include "ASPoint.h"

namespace ais
{
    template <class PT = Point>
    class AIS_EXPORT Edge
    {
    public:
        PT points[2];
        size_t hash{0};

        Edge() = default;

        Edge(const PT &p0, const PT &p1)
        {
            points[0] = p0;
            points[1] = p1;

            get_hash();
        }

        inline size_t get_hash()
        {
            if (hash != 0)
                return hash;

            bool flag = points[0] < points[1];

            auto h0 = flag ? points[0].hash() : points[1].hash();
            auto h1 = flag ? points[1].hash() : points[0].hash();

            hash = h0 ^ (h1 << 1);
            return hash;
        }

        bool operator==(const Edge<PT> &rhs) const
        {
            return (points[0] == rhs.points[0] && points[1] == rhs.points[1]) ||
                   (points[0] == rhs.points[1] && points[1] == rhs.points[0]);
        }
    };
} // namespace ais