// Copyright (C) Stichting Deltares 2025. All rights reserved.
// 
// This file is part of the Dam Engine.
// 
// The Dam Engine is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero 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 Affero General Public License for more details.
// 
// You should have received a copy of the GNU Affero 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 Deltares.DamEngine.Data.Geometry;
using NUnit.Framework;

namespace Deltares.DamEngine.Data.Tests.Geometry;

[TestFixture]
public class GeometryPointStringTests
{
    [Test]
    public void GivenGeometryPointStringWithRedundantPoints_WhenRemovingUnnecessaryPoints_ThenCorrectGeometryPointStringReturned()
    {
        var geometryPointString = new GeometryPointString();

        // The polyline contains only 3 identical points => expected 1 point
        geometryPointString.Points.Add(new Point2D(2, 3));
        geometryPointString.Points.Add(new Point2D(2, 3));
        geometryPointString.Points.Add(new Point2D(2, 3));
        geometryPointString.RemoveUnnecessaryPoints();
        Assert.That(geometryPointString.Points, Has.Count.EqualTo(1));
        Assert.Multiple(() =>
        {
            Assert.That(geometryPointString.Points[0].X, Is.EqualTo(2));
            Assert.That(geometryPointString.Points[0].Z, Is.EqualTo(3));
        });

        // The polyline contains 1 straight line with 3 points => expected 2 points
        geometryPointString.Points.Clear();
        geometryPointString.Points.Add(new Point2D(2, 3));
        geometryPointString.Points.Add(new Point2D(3, 3));
        geometryPointString.Points.Add(new Point2D(4, 3));
        geometryPointString.RemoveUnnecessaryPoints();
        Assert.That(geometryPointString.Points, Has.Count.EqualTo(2));
        Assert.Multiple(() =>
        {
            Assert.That(geometryPointString.Points[0].X, Is.EqualTo(2));
            Assert.That(geometryPointString.Points[0].Z, Is.EqualTo(3));
            Assert.That(geometryPointString.Points[1].X, Is.EqualTo(4));
            Assert.That(geometryPointString.Points[1].Z, Is.EqualTo(3));
        });

        // The polyline contains 1 straight line with 5 points => expected 2 points
        geometryPointString.Points.Clear();
        geometryPointString.Points.Add(new Point2D(2, 3));
        geometryPointString.Points.Add(new Point2D(3, 3));
        geometryPointString.Points.Add(new Point2D(4, 3));
        geometryPointString.Points.Add(new Point2D(5, 3));
        geometryPointString.Points.Add(new Point2D(6, 3));
        geometryPointString.RemoveUnnecessaryPoints();
        Assert.That(geometryPointString.Points, Has.Count.EqualTo(2));
        Assert.Multiple(() =>
        {
            Assert.That(geometryPointString.Points[0].X, Is.EqualTo(2));
            Assert.That(geometryPointString.Points[0].Z, Is.EqualTo(3));
            Assert.That(geometryPointString.Points[1].X, Is.EqualTo(6));
            Assert.That(geometryPointString.Points[1].Z, Is.EqualTo(3));
        });

        // The polyline contains 2 straight lines with 5 points => expected 3 points
        geometryPointString.Points.Clear();
        geometryPointString.Points.Add(new Point2D(2, 3));
        geometryPointString.Points.Add(new Point2D(3, 4));
        geometryPointString.Points.Add(new Point2D(4, 5));
        geometryPointString.Points.Add(new Point2D(5, 4));
        geometryPointString.Points.Add(new Point2D(6, 3));
        geometryPointString.RemoveUnnecessaryPoints();
        Assert.That(geometryPointString.Points, Has.Count.EqualTo(3));
        Assert.Multiple(() =>
        {
            Assert.That(geometryPointString.Points[0].X, Is.EqualTo(2));
            Assert.That(geometryPointString.Points[0].Z, Is.EqualTo(3));
            Assert.That(geometryPointString.Points[1].X, Is.EqualTo(4));
            Assert.That(geometryPointString.Points[1].Z, Is.EqualTo(5));
            Assert.That(geometryPointString.Points[2].X, Is.EqualTo(6));
            Assert.That(geometryPointString.Points[2].Z, Is.EqualTo(3));
        });
    }
}