// Copyright (C) Stichting Deltares 2017. 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 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;
using Core.Common.Base.Geometry;
using NUnit.Framework;
using Ringtoets.Common.IO.SoilProfile;

namespace Ringtoets.Common.IO.Test.SoilProfile
{
    [TestFixture]
    public class SoilLayer2DLoopTest
    {
        [Test]
        public void Constructor_SegmentsNull_ThrowsArgumentNullException()
        {
            // Call
            TestDelegate test = () => new SoilLayer2DLoop(null);

            // Assert
            string paramName = Assert.Throws<ArgumentNullException>(test).ParamName;
            Assert.AreEqual("segments", paramName);
        }

        [Test]
        public void Constructor_ConnectedSegments_SetsSegments()
        {
            // Setup
            var pointA = new Point2D(0.0, 0.0);
            var pointB = new Point2D(1.0, 0.0);

            var arrayWithConnectedSegments = new[]
            {
                new Segment2D(pointA, pointB),
                new Segment2D(pointB, pointA)
            };

            // Call
            var loop = new SoilLayer2DLoop(arrayWithConnectedSegments);

            // Assert
            Assert.AreSame(arrayWithConnectedSegments, loop.Segments);
        }

        [Test]
        public void Constructor_DisconnectedSegment_ThrowsArgumentException()
        {
            // Setup
            var pointA = new Point2D(0.0, 0.0);
            var pointB = new Point2D(1.0, 0.0);
            var pointC = new Point2D(0.0, 1.0e-20);

            var arrayWithDisconnectedSegment = new[]
            {
                new Segment2D(pointA, pointB),
                new Segment2D(pointB, pointC)
            };

            // Call
            TestDelegate test = () => { new SoilLayer2DLoop(arrayWithDisconnectedSegment); };

            // Assert
            var exception = Assert.Throws<ArgumentException>(test);
            Assert.AreEqual("De segmenten van de geometrie van de laag vormen geen lus.", exception.Message);
        }

        [Test]
        public void Constructor_InversedSegment_ThrowsArgumentException()
        {
            // Setup
            var pointA = new Point2D(0.0, 0.0);
            var pointB = new Point2D(1.0, 0.0);
            var pointC = new Point2D(2.0, 0.0);
            var pointD = new Point2D(0.0, 0.0);

            var arrayWithInversedSegment = new[]
            {
                new Segment2D(pointA, pointB),
                new Segment2D(pointB, pointC),
                new Segment2D(pointD, pointC),
                new Segment2D(pointD, pointA)
            };

            // Call
            TestDelegate test = () => { new SoilLayer2DLoop(arrayWithInversedSegment); };

            // Assert
            var exception = Assert.Throws<ArgumentException>(test);
            Assert.AreEqual("De segmenten van de geometrie van de laag vormen geen lus.", exception.Message);
        }

        [Test]
        public void GetHashCode_EqualLoops_AreEqual()
        {
            // Setup
            SoilLayer2DLoop loopA = CreateValidLoop(1.0);
            SoilLayer2DLoop loopB = CreateValidLoop(1.0);

            // Precondition
            Assert.AreEqual(loopA, loopB);
            Assert.AreEqual(loopB, loopA);

            // Call & Assert
            Assert.AreEqual(loopA.GetHashCode(), loopB.GetHashCode());
            Assert.AreEqual(loopB.GetHashCode(), loopA.GetHashCode());
        }

        [Test]
        public void Equals_DifferentType_ReturnsFalse()
        {
            // Setup
            SoilLayer2DLoop loop = CreateValidLoop(1.0);

            // Call
            bool areEqual = loop.Equals(new object());

            // Assert
            Assert.IsFalse(areEqual);
        }

        [Test]
        public void Equals_Null_ReturnsFalse()
        {
            // Setup
            SoilLayer2DLoop loop = CreateValidLoop(1.0);

            // Call
            bool areEqual = loop.Equals(null);

            // Assert
            Assert.IsFalse(areEqual);
        }

        [Test]
        [TestCaseSource(nameof(LoopCombinations))]
        public void Equals_DifferentScenarios_ReturnsExpectedResult(SoilLayer2DLoop loop,
                                                                    SoilLayer2DLoop otherLoop,
                                                                    bool expectedEqual)
        {
            // Call
            bool areEqualOne = loop.Equals(otherLoop);
            bool areEqualTwo = otherLoop.Equals(loop);

            // Assert
            Assert.AreEqual(expectedEqual, areEqualOne);
            Assert.AreEqual(expectedEqual, areEqualTwo);
        }

        private static SoilLayer2DLoop CreateValidLoop(double x)
        {
            var pointA = new Point2D(0.0, 0.0);
            var pointB = new Point2D(x, 0.0);

            var segments = new[]
            {
                new Segment2D(pointA, pointB),
                new Segment2D(pointB, pointA)
            };

            return new SoilLayer2DLoop(segments);
        }

        private static TestCaseData[] LoopCombinations()
        {
            SoilLayer2DLoop loopA = CreateValidLoop(1.0);
            SoilLayer2DLoop loopB = CreateValidLoop(1.0);
            SoilLayer2DLoop loopC = CreateValidLoop(2.0);

            return new[]
            {
                new TestCaseData(loopA, loopA, true)
                {
                    TestName = "Equals_LoopALoopA_True"
                },
                new TestCaseData(loopA, loopB, true)
                {
                    TestName = "Equals_LoopALoopB_True"
                },
                new TestCaseData(loopA, loopC, false)
                {
                    TestName = "Equals_LoopALoopC_False"
                }
            };
        }
    }
}