// 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 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.Data;
using Core.Common.TestUtil;
using NUnit.Framework;
using Ringtoets.Common.Data.Probabilistics;

namespace Ringtoets.Common.Data.Test.Probabilistics
{
    [TestFixture]
    public class VariationCoefficientLogNormalDistributionTest
    {
        [Test]
        public void Constructor_ExpectedValues()
        {
            // Setup
            const int numberOfDecimals = 3;

            // Call
            var distribution = new VariationCoefficientLogNormalDistribution(numberOfDecimals);

            // Assert
            Assert.IsInstanceOf<IVariationCoefficientDistribution>(distribution);
            Assert.AreEqual(numberOfDecimals, distribution.Mean.NumberOfDecimalPlaces);
            Assert.AreEqual(1.0, distribution.Mean.Value);
            Assert.AreEqual(numberOfDecimals, distribution.CoefficientOfVariation.NumberOfDecimalPlaces);
            Assert.AreEqual(1.0, distribution.CoefficientOfVariation.Value);
        }

        [Test]
        [TestCase(-1)]
        [TestCase(16)]
        public void Constructor_InvalidNumberOfDecimalPlaces_ThrowArgumentOutOfRangeException(int numberOfDecimals)
        {
            // Call
            TestDelegate call = () => new VariationCoefficientLogNormalDistribution(numberOfDecimals);

            // Assert
            TestHelper.AssertThrowsArgumentExceptionAndTestMessage<ArgumentOutOfRangeException>(call, "Value must be in range [0, 15].");
        }

        [Test]
        [TestCase(0.005, 0.01)]
        [TestCase(34.56789, 34.57)]
        public void Mean_SetNewValue_ReturnNewlySetValue(double actualSetValue, double expectedRoundedValue)
        {
            // Setup
            var distribution = new VariationCoefficientLogNormalDistribution(2);

            // Call
            distribution.Mean = (RoundedDouble)actualSetValue;

            // Assert
            Assert.AreEqual(expectedRoundedValue, distribution.Mean.Value);
        }

        [Test]
        [TestCase(0.004)]
        [TestCase(-1.2)]
        public void Mean_NegativeOrZeroValue_ThrowArgumentOutOfRangeException(double invalidCoefficient)
        {
            // Setup
            var distribution = new VariationCoefficientLogNormalDistribution(2);

            // Call
            TestDelegate call = () => distribution.Mean = (RoundedDouble)invalidCoefficient;

            // Assert
            string expectedMessage = "Gemiddelde moet groter zijn dan 0.";
            TestHelper.AssertThrowsArgumentExceptionAndTestMessage<ArgumentOutOfRangeException>(call, expectedMessage);
        }

        [Test]
        [TestCase(-0.004, 0.0)]
        [TestCase(0.0, 0.0)]
        [TestCase(34.56789, 34.57)]
        public void CoefficientOfVariation_SetNewValue_ReturnNewlySetValue(
            double actualSetValue, double expectedRoundedValue)
        {
            // Setup
            var distribution = new VariationCoefficientLogNormalDistribution(2);

            // Call
            distribution.CoefficientOfVariation = (RoundedDouble)actualSetValue;

            // Assert
            Assert.AreEqual(expectedRoundedValue, distribution.CoefficientOfVariation.Value);
        }

        [Test]
        [TestCase(-0.005)]
        [TestCase(-1.2)]
        public void CoefficientOfVariation_NegativeValue_ThrowArgumentOutOfRangeException(double invalidCoefficient)
        {
            // Setup
            var distribution = new VariationCoefficientLogNormalDistribution(2);

            // Call
            TestDelegate call = () => distribution.CoefficientOfVariation = (RoundedDouble)invalidCoefficient;

            // Assert
            string expectedMessage = "Variatiecoëfficiënt (CV) moet groter zijn dan of gelijk zijn aan 0.";
            TestHelper.AssertThrowsArgumentExceptionAndTestMessage<ArgumentOutOfRangeException>(call, expectedMessage);
        }
    }
}