// Copyright (C) Stichting Deltares 2024. All rights reserved.
// 
// This file is part of the application DAM - UI.
// 
// DAM - UI 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 this program. If not, see <http://www.gnu.org/licenses/>.
// 
// All names, logos, and references to "Deltares" are registered trademarks of
// Stichting Deltares and remain full property of Stichting Deltares at all times.
// All rights reserved.

using System.Collections.Generic;
using Deltares.Geometry;

namespace Deltares.Dam.StixFileReader.Tests.TestUtils;

/// <summary>
/// Class which contains methods for comparing <see cref="GeometryPoint"/>.
/// </summary>
public class GeometryPointEqualityComparer : IEqualityComparer<GeometryPoint>
{
    private readonly DoubleEqualityComparer doubleEqualityComparer = new(1e-6);

    /// <summary>
    /// Class which contains methods for comparing <see cref="GeometryPoint" />.
    /// </summary>
    /// <param name="x">First point to compare.</param>
    /// <param name="y">Second point to compare.</param>
    public bool Equals(GeometryPoint x, GeometryPoint y)
    {
        if (x == null && y == null)
        {
            return true;
        }

        if (x == null || y == null)
        {
            return false;
        }

        return AreEqual(x.X, y.X)
               && AreEqual(x.Z, y.Z);
    }

    public int GetHashCode(GeometryPoint obj)
    {
        return 0;
    }

    private bool AreEqual(double x, double y)
    {
        return doubleEqualityComparer.Equals(x, y);
    }
}