// Copyright (C) Stichting Deltares 2016. 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;
using Core.Common.Base.Geometry;
using Core.Common.TestUtil;
using NUnit.Framework;

namespace Core.Common.Base.Test.Geometry
{
    [TestFixture]
    public class Point3DExtensionsTest
    {
        [Test]
        public void ProjectIntoLocalCoordinates_WorldCoordinateNull_ThrowsArgumentNullException()
        {
            // Call
            TestDelegate call = () => Point3DExtensions.ProjectIntoLocalCoordinates(null, new Point2D(1.0, 2.0), new Point2D(3.0, 4.0));

            // Assert
            var exception = Assert.Throws<ArgumentNullException>(call);
            Assert.AreEqual("worldCoordinate", exception.ParamName);
        }

        [Test]
        public void ProjectIntoLocalCoordinates_StartWorldCoordinateNull_ThrowsArgumentNullException()
        {
            // Setup
            Point3D point = new Point3D(1.0, 2.0, 3.0);

            // Call
            TestDelegate call = () => point.ProjectIntoLocalCoordinates(null, new Point2D(3.0, 4.0));

            // Assert
            var exception = Assert.Throws<ArgumentNullException>(call);
            Assert.AreEqual("startWorldCoordinate", exception.ParamName);
        }

        [Test]
        public void ProjectIntoLocalCoordinates_EndWorldCoordinateNull_ThrowsArgumentNullException()
        {
            // Setup
            Point3D point = new Point3D(1.0, 2.0, 3.0);

            // Call
            TestDelegate call = () => point.ProjectIntoLocalCoordinates(new Point2D(1.0, 2.0), null);

            // Assert
            var exception = Assert.Throws<ArgumentNullException>(call);
            Assert.AreEqual("endWorldCoordinate", exception.ParamName);
        }

        [Test]
        public void ProjectIntoLocalCoordinates_WorldCoordinateSameAsStartAndEndWorldCoordinate_ThrowsArgumentException()
        {
            // Setup
            const double originalZ = 3.3;
            Point3D point = new Point3D(1.1, 2.2, originalZ);

            Point2D startAndEndPoint = new Point2D(point.X, point.Y);

            // Call
            TestDelegate call = () => point.ProjectIntoLocalCoordinates(startAndEndPoint, startAndEndPoint);

            // Assert
            TestHelper.AssertThrowsArgumentExceptionAndTestMessage<ArgumentException>(call, "The startWorldCoordinate and endWorldCoordinate can't be the same.");
        }

        [Test]
        public void ProjectIntoLocalCoordinates_StartAndEndWorldCoordinateLengthSmallerThanTolerance_ThrowsArgumentException()
        {
            // Setup
            const double originalZ = 3.3;
            Point3D point = new Point3D(1.1, 2.2, originalZ);

            Point2D startPoint = new Point2D(point.X, point.Y);
            Point2D endPoint = new Point2D(point.X, point.Y + 1e-7);

            // Call
            TestDelegate call = () => point.ProjectIntoLocalCoordinates(startPoint, endPoint);

            // Assert
            TestHelper.AssertThrowsArgumentExceptionAndTestMessage<ArgumentException>(call, "The startWorldCoordinate and endWorldCoordinate can't be the same.");
        }

        [Test]
        public void ProjectIntoLocalCoordinates_StartAndEndWorldCoordinateLengthBiggerThanTolerance_DoesNotThrow()
        {
            // Setup
            const double originalZ = 3.3;
            Point3D point = new Point3D(1.1, 2.2, originalZ);

            Point2D startPoint = new Point2D(point.X, point.Y);
            Point2D endPoint = new Point2D(point.X, point.Y + 1e-6);

            // Call
            TestDelegate call = () => point.ProjectIntoLocalCoordinates(startPoint, endPoint);

            // Assert
            Assert.DoesNotThrow(call);
        }

        [Test]
        public void ProjectIntoLocalCoordinates_GeometryWithMultiplePoints_ProjectPointsOntoLzPlaneKeepingOriginalZ()
        {
            // Setup
            Point2D startPoint = new Point2D(1.0, 1.0);
            Point3D pointToConvert = new Point3D(2.0, 3.0, 4.4); // Outlier from line specified by extrema
            Point2D endPoint = new Point2D(3.0, 4.0);

            // Call
            Point2D convertedPoint = pointToConvert.ProjectIntoLocalCoordinates(startPoint, endPoint);

            // Assert
            var length = Math.Sqrt(2 * 2 + 3 * 3);
            const double pointToConvertCoordinateFactor = (2.0 * 1.0 + 3.0 * 2.0) / (2.0 * 2.0 + 3.0 * 3.0);
            double expectedX = pointToConvertCoordinateFactor * length;

            Assert.AreEqual(new Point2D(expectedX, pointToConvert.Z), convertedPoint);
        }
    }
}