// Copyright (C) Stichting Deltares 2025. All rights reserved.
// 
// This file is part of the Dam Engine.
// 
// The Dam Engine is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero 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,
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
// 
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
// 
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// Stichting Deltares and remain full property of Stichting Deltares at all times.
// All rights reserved.

using System;
using Deltares.DamEngine.Calculators.KernelWrappers.MacroStabilityCommon.MacroStabilityIo;
using NUnit.Framework;

namespace Deltares.DamEngine.Calculators.Tests.KernelWrappers.MacroStabilityCommon.MacroStabilityIo;

[TestFixture]
public class GivenObjectRegistry
{
    private static ObjectRegistry objectRegistry;

    [SetUp]
    public static void Arrange()
    {
        objectRegistry = new ObjectRegistry();
    }

    [Test]
    public static void WhenGetObjectFromNonExistingIndex_ThenThrowsInvalidOperationException()
    {
        Assert.That(() => objectRegistry.GetObject(0), Throws.InstanceOf<InvalidOperationException>());
    }

    [Test]
    public static void WhenGetIdWithoutObject_ThenThrowsArgumentNullException()
    {
        Assert.That(() => objectRegistry.GetId(null), Throws.ArgumentNullException);
    }

    [TestFixture]
    public class WhenGetId : GivenObjectRegistry
    {
        private static int index;
        private static object @object;

        [SetUp]
        public new static void Arrange()
        {
            @object = new object();
            index = objectRegistry.GetId(@object);
        }

        [Test]
        public static void ThenIndexIsZero()
        {
            Assert.That(index, Is.Zero);
        }

        [Test]
        public static void WhenGetObjectUsingReceivedIndex_ThenObjectIsTheSame()
        {
            object receivedObject = objectRegistry.GetObject(index);

            Assert.That(receivedObject, Is.SameAs(@object));
        }

        [Test]
        public static void WhenGetIdFromOtherObject_ThenReturnsIndexIncreasedWithOne()
        {
            int newIndex = objectRegistry.GetId(new object());

            Assert.That(newIndex, Is.EqualTo(index + 1));
        }

        [Test]
        public static void WhenGetIdFromSameObject_ThenReturnsIndex()
        {
            int newIndex = objectRegistry.GetId(@object);

            Assert.That(newIndex, Is.EqualTo(index));
        }
    }
}