// Copyright (C) Stichting Deltares 2018. 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.

namespace Deltares.Dam.Tests
{
    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using Deltares.Dam.Data;
    using NUnit.Framework;

    [TestFixture]
    public class OvertoppingErosionCalculatorTest
    {
        private EntityFactory entityFactory;

        [TestFixtureSetUp]
        public void FixtureSetup()
        {
            entityFactory = new EntityFactory();
        }

        [Test]        
        public void CheckIfDecayIsCalculatedCorrectlyWithParameters()
        {
            const double cTolerance = 0.000001;
            double remainingStrength;
  
            var overtoppingErosionCalculator = new OvertoppingErosionCalculator();
            remainingStrength = overtoppingErosionCalculator.CalculateRemainingStrength(20, Deg2Rad(22.5), 0.7, 9.0);
            Assert.AreEqual(1.0 - 0.0, remainingStrength, cTolerance);
            remainingStrength = overtoppingErosionCalculator.CalculateRemainingStrength(20, Deg2Rad(22.5), 0.7, 12.0);
            Assert.AreEqual(1.0 - 0.000138, remainingStrength, cTolerance);
            remainingStrength = overtoppingErosionCalculator.CalculateRemainingStrength(20, Deg2Rad(22.5), 0.7, 22.0);
            Assert.AreEqual(0.0, remainingStrength, cTolerance); // decay = 1.053672948
            remainingStrength = overtoppingErosionCalculator.CalculateRemainingStrength(20, Deg2Rad(22.5), 0.7, 45.0);
            Assert.AreEqual(0.0, remainingStrength, cTolerance); // decay = 3503.01008749
            remainingStrength = overtoppingErosionCalculator.CalculateRemainingStrength(20, Deg2Rad(22.5), 0.7, 50.0);
            Assert.AreEqual(0.0, remainingStrength, cTolerance); // decay = 9615.35064791
        }

        private static double Deg2Rad(double deg)
        {
            return (Math.PI * deg) / 180.0;
        }

        [Test]
        public void CheckIfDecayIsCalculatedCorrectly()
        {
            const double cTolerance = 0.000001;
            double remainingStrength;
            double decayWithParameters;
            
            var overtoppingErosionCalculator = new OvertoppingErosionCalculator();
            using (var dummyDike = entityFactory.CreateDummyDike("Test"))
            {
                overtoppingErosionCalculator.Location = dummyDike.Locations.First();
                overtoppingErosionCalculator.TimeStepInHours = 0.15;
                overtoppingErosionCalculator.GrassQualityFactor = 0.7;
                remainingStrength = overtoppingErosionCalculator.Calculate(50.0);
                // Location 1: Top dike polder = (35.2, 8.62) 
                //             InsteekShoulderInside or (if not exists) Toe dike polder = (41.5, -3.76);
                //             dx = 41.5 - 35.2 = 6.3
                //             dy = 8.62 - (-3.76) = 12.38
                // DikeSlope = ATan(12.38 / 6.3) = 1.100
                decayWithParameters = overtoppingErosionCalculator.CalculateRemainingStrength(0.15, 1.1000657712071196, 0.7, 50.0);
                Assert.AreEqual(decayWithParameters, remainingStrength, cTolerance);
            }
        }

        [TestFixtureTearDown]
        public void FixtureTearDown()
        {
        }
    }
}