// Copyright (C) Stichting Deltares 2018. All rights reserved.
//
// This file is part of Ringtoets.
//
// Ringtoets is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser 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 Core.Common.Base.Geometry;
using NUnit.Framework;

namespace Core.Common.Base.Test.Geometry
{
    [TestFixture]
    public class Segment2DExtensionsTest
    {
        [Test]
        [TestCaseSource(nameof(ValidInterpolationSegment))]
        public void Interpolate_ValidArguments_ReturnsExpectedResult(Segment2D segment,
                                                                     double interpolateOnX,
                                                                     double expectedY)
        {
            // Call
            double actualY = segment.Interpolate(interpolateOnX);

            // Assert
            Assert.AreEqual(expectedY, actualY);
        }

        [Test]
        [TestCaseSource(nameof(InvalidInterpolationSegment))]
        public void Interpolate_InvalidArguments_ReturnsNaN(Segment2D segment,
                                                            double interpolateOnX)
        {
            // Call
            double actualY = segment.Interpolate(interpolateOnX);

            // Assert
            Assert.IsNaN(actualY);
        }

        private static IEnumerable<TestCaseData> ValidInterpolationSegment()
        {
            yield return new TestCaseData(
                new Segment2D(new Point2D(0, 10),
                              new Point2D(10, 100)),
                0,
                10).SetName("Same as first point that passed through origin");

            yield return new TestCaseData(
                new Segment2D(new Point2D(0, 10),
                              new Point2D(10, 100)),
                -10,
                -80).SetName("Left of first point");

            yield return new TestCaseData(
                new Segment2D(new Point2D(1, 10),
                              new Point2D(10, 100)),
                1,
                10).SetName("Same as first point");

            yield return new TestCaseData(
                new Segment2D(new Point2D(1, 10),
                              new Point2D(10, 100)),
                10,
                100).SetName("Same as second point");

            yield return new TestCaseData(
                new Segment2D(new Point2D(1, 1),
                              new Point2D(10, 10)),
                5,
                5).SetName("Slope = 1, b = 0");

            yield return new TestCaseData(
                new Segment2D(new Point2D(0, 0),
                              new Point2D(10, 1000)),
                5,
                500).SetName("Slope = 100, b = 0");

            yield return new TestCaseData(
                new Segment2D(new Point2D(0, 0),
                              new Point2D(-5, -9)),
                5,
                (9.0 / 5.0) * 5).SetName("Slope = 9/5, b = 0");

            yield return new TestCaseData(
                new Segment2D(new Point2D(5, 2),
                              new Point2D(90, 3)),
                50,
                ((1 / 85.0) * 50) + (33 / 17.0)).SetName("Slope = 1/85, b = 33/17");
        }

        private static IEnumerable<TestCaseData> InvalidInterpolationSegment()
        {
            yield return new TestCaseData(
                new Segment2D(new Point2D(0, 10),
                              new Point2D(0, 10)),
                0).SetName("Vertical line");

            yield return new TestCaseData(
                new Segment2D(new Point2D(0, 0),
                              new Point2D(double.PositiveInfinity, double.PositiveInfinity)),
                20).SetName("PositiveInfinity");

            yield return new TestCaseData(
                new Segment2D(new Point2D(0, 0),
                              new Point2D(double.NegativeInfinity, double.NegativeInfinity)),
                20).SetName("NegativeInfinity");

            yield return new TestCaseData(
                new Segment2D(new Point2D(0, 0),
                              new Point2D(double.NaN, double.NaN)),
                20).SetName("NaN");
        }
    }
}