using Content.Shared.Chemistry.Components;
using Content.Shared.FixedPoint;
using NUnit.Framework;
using Robust.Shared.IoC;
using Robust.Shared.Prototypes;

namespace Content.Tests.Shared.Chemistry;

[TestFixture, Parallelizable, TestOf(typeof(Solution))]
public sealed class SolutionTests : ContentUnitTest
{
    [OneTimeSetUp]
    public void Setup()
    {
        IoCManager.Resolve<IPrototypeManager>().Initialize();
    }

    [Test]
    public void AddReagentAndGetSolution()
    {
        var solution = new Solution();
        solution.AddReagent("water", FixedPoint2.New(1000));
        var quantity = solution.GetTotalPrototypeQuantity("water");

        Assert.That(quantity.Int(), Is.EqualTo(1000));
    }

    [Test]
    public void ScaleSolution()
    {
        var solution = new Solution();
        solution.AddReagent("water", FixedPoint2.New(20));
        solution.AddReagent("fire", FixedPoint2.New(30));

        // Test integer scaling
        {
            var tmp = solution.Clone();
            tmp.ScaleSolution(0);
            Assert.That(tmp.Contents.Count, Is.EqualTo(0));
            Assert.That(tmp.Volume, Is.EqualTo(FixedPoint2.Zero));

            tmp = solution.Clone();
            tmp.ScaleSolution(2);
            Assert.That(tmp.Contents.Count, Is.EqualTo(2));
            Assert.That(tmp.Volume, Is.EqualTo(FixedPoint2.New(100)));
            Assert.That(tmp.GetTotalPrototypeQuantity("water"), Is.EqualTo(FixedPoint2.New(40)));
            Assert.That(tmp.GetTotalPrototypeQuantity("fire"), Is.EqualTo(FixedPoint2.New(60)));
        }

        // Test float scaling
        {
            var tmp = solution.Clone();
            tmp.ScaleSolution(0f);
            Assert.That(tmp.Contents.Count, Is.EqualTo(0));
            Assert.That(tmp.Volume, Is.EqualTo(FixedPoint2.Zero));

            tmp = solution.Clone();
            tmp.ScaleSolution(2f);
            Assert.That(tmp.Contents.Count, Is.EqualTo(2));
            Assert.That(tmp.Volume, Is.EqualTo(FixedPoint2.New(100)));
            Assert.That(tmp.GetTotalPrototypeQuantity("water"), Is.EqualTo(FixedPoint2.New(40)));
            Assert.That(tmp.GetTotalPrototypeQuantity("fire"), Is.EqualTo(FixedPoint2.New(60)));

            tmp = solution.Clone();
            tmp.ScaleSolution(0.3f);
            Assert.That(tmp.Contents.Count, Is.EqualTo(2));
            Assert.That(tmp.Volume, Is.EqualTo(FixedPoint2.New(15)));
            Assert.That(tmp.GetTotalPrototypeQuantity("water"), Is.EqualTo(FixedPoint2.New(6)));
            Assert.That(tmp.GetTotalPrototypeQuantity("fire"), Is.EqualTo(FixedPoint2.New(9)));
        }
    }

    [Test]
    public void ConstructorAddReagent()
    {
        var solution = new Solution("water", FixedPoint2.New(1000));
        var quantity = solution.GetTotalPrototypeQuantity("water");

        Assert.That(quantity.Int(), Is.EqualTo(1000));
    }

    [Test]
    public void NonExistingReagentReturnsZero()
    {
        var solution = new Solution();
        var quantity = solution.GetTotalPrototypeQuantity("water");

        Assert.That(quantity.Int(), Is.EqualTo(0));
    }

#if !DEBUG
    [Test]
    public void AddLessThanZeroReagentReturnsZero()
    {
        var solution = new Solution("water", FixedPoint2.New(-1000));
        var quantity = solution.GetTotalPrototypeQuantity("water");

        Assert.That(quantity.Int(), Is.EqualTo(0));
    }
#endif

    [Test]
    public void AddingReagentsSumsProperly()
    {
        var solution = new Solution();
        solution.AddReagent("water", FixedPoint2.New(1000));
        solution.AddReagent("water", FixedPoint2.New(2000));
        var quantity = solution.GetTotalPrototypeQuantity("water");

        Assert.That(quantity.Int(), Is.EqualTo(3000));
    }

    [Test]
    public void ReagentQuantitiesStayUnique()
    {
        var solution = new Solution();
        solution.AddReagent("water", FixedPoint2.New(1000));
        solution.AddReagent("fire", FixedPoint2.New(2000));

        Assert.That(solution.GetTotalPrototypeQuantity("water").Int(), Is.EqualTo(1000));
        Assert.That(solution.GetTotalPrototypeQuantity("fire").Int(), Is.EqualTo(2000));
    }

    [Test]
    public void TotalVolumeIsCorrect()
    {
        var solution = new Solution();
        solution.AddReagent("water", FixedPoint2.New(1000));
        solution.AddReagent("fire", FixedPoint2.New(2000));

        Assert.That(solution.Volume.Int(), Is.EqualTo(3000));
    }

    [Test]
    public void CloningSolutionIsCorrect()
    {
        var solution = new Solution();
        solution.AddReagent("water", FixedPoint2.New(1000));
        solution.AddReagent("fire", FixedPoint2.New(2000));

        var newSolution = solution.Clone();

        Assert.That(newSolution.GetTotalPrototypeQuantity("water").Int(), Is.EqualTo(1000));
        Assert.That(newSolution.GetTotalPrototypeQuantity("fire").Int(), Is.EqualTo(2000));
        Assert.That(newSolution.Volume.Int(), Is.EqualTo(3000));
    }

    [Test]
    public void RemoveSolutionRecalculatesProperly()
    {
        var solution = new Solution();
        solution.AddReagent("water", FixedPoint2.New(1000));
        solution.AddReagent("fire", FixedPoint2.New(2000));

        solution.RemoveReagent("water", FixedPoint2.New(500));

        Assert.That(solution.GetTotalPrototypeQuantity("water").Int(), Is.EqualTo(500));
        Assert.That(solution.GetTotalPrototypeQuantity("fire").Int(), Is.EqualTo(2000));
        Assert.That(solution.Volume.Int(), Is.EqualTo(2500));
    }

    [Test]
    public void RemoveLessThanOneQuantityDoesNothing()
    {
        var solution = new Solution("water", FixedPoint2.New(100));

        solution.RemoveReagent("water", FixedPoint2.New(-100));

        Assert.That(solution.GetTotalPrototypeQuantity("water").Int(), Is.EqualTo(100));
        Assert.That(solution.Volume.Int(), Is.EqualTo(100));
    }

    [Test]
    public void RemoveMoreThanTotalRemovesAllReagent()
    {
        var solution = new Solution("water", FixedPoint2.New(100));

        solution.RemoveReagent("water", FixedPoint2.New(1000));

        Assert.That(solution.GetTotalPrototypeQuantity("water").Int(), Is.EqualTo(0));
        Assert.That(solution.Volume.Int(), Is.EqualTo(0));
    }

    [Test]
    public void RemoveNonExistReagentDoesNothing()
    {
        var solution = new Solution("water", FixedPoint2.New(100));

        solution.RemoveReagent("fire", FixedPoint2.New(1000));

        Assert.That(solution.GetTotalPrototypeQuantity("water").Int(), Is.EqualTo(100));
        Assert.That(solution.Volume.Int(), Is.EqualTo(100));
    }

    [Test]
    public void RemoveSolution()
    {
        var solution = new Solution("water", FixedPoint2.New(700));

        solution.RemoveSolution(FixedPoint2.New(500));

        //Check that edited solution is correct
        Assert.That(solution.GetTotalPrototypeQuantity("water").Int(), Is.EqualTo(200));
        Assert.That(solution.Volume.Int(), Is.EqualTo(200));
    }

    [Test]
    public void RemoveSolutionMoreThanTotalRemovesAll()
    {
        var solution = new Solution("water", FixedPoint2.New(800));

        solution.RemoveSolution(FixedPoint2.New(1000));

        //Check that edited solution is correct
        Assert.That(solution.GetTotalPrototypeQuantity("water").Int(), Is.EqualTo(0));
        Assert.That(solution.Volume.Int(), Is.EqualTo(0));
    }

    [Test]
    public void RemoveSolutionRatioPreserved()
    {
        var solution = new Solution();
        solution.AddReagent("water", FixedPoint2.New(1000));
        solution.AddReagent("fire", FixedPoint2.New(2000));

        solution.RemoveSolution(FixedPoint2.New(1500));

        Assert.That(solution.GetTotalPrototypeQuantity("water").Int(), Is.EqualTo(500));
        Assert.That(solution.GetTotalPrototypeQuantity("fire").Int(), Is.EqualTo(1000));
        Assert.That(solution.Volume.Int(), Is.EqualTo(1500));
    }

    [Test]
    public void RemoveSolutionLessThanOneDoesNothing()
    {
        var solution = new Solution("water", FixedPoint2.New(800));

        solution.RemoveSolution(FixedPoint2.New(-200));

        Assert.That(solution.GetTotalPrototypeQuantity("water").Int(), Is.EqualTo(800));
        Assert.That(solution.Volume.Int(), Is.EqualTo(800));
    }

    [Test]
    public void SplitSolution()
    {
        var solution = new Solution();
        solution.AddReagent("water", FixedPoint2.New(1000));
        solution.AddReagent("fire", FixedPoint2.New(2000));

        var splitSolution = solution.SplitSolution(FixedPoint2.New(750));

        Assert.That(solution.GetTotalPrototypeQuantity("water").Int(), Is.EqualTo(750));
        Assert.That(solution.GetTotalPrototypeQuantity("fire").Int(), Is.EqualTo(1500));
        Assert.That(solution.Volume.Int(), Is.EqualTo(2250));

        Assert.That(splitSolution.GetTotalPrototypeQuantity("water").Int(), Is.EqualTo(250));
        Assert.That(splitSolution.GetTotalPrototypeQuantity("fire").Int(), Is.EqualTo(500));
        Assert.That(splitSolution.Volume.Int(), Is.EqualTo(750));
    }

    [Test]
    public void SplitSolutionFractional()
    {
        var solution = new Solution();
        solution.AddReagent("water", FixedPoint2.New(1));
        solution.AddReagent("fire", FixedPoint2.New(2));

        var splitSolution = solution.SplitSolution(FixedPoint2.New(1));

        Assert.That(solution.GetTotalPrototypeQuantity("water").Float(), Is.EqualTo(0.66f));
        Assert.That(solution.GetTotalPrototypeQuantity("fire").Float(), Is.EqualTo(1.34f));
        Assert.That(solution.Volume.Int(), Is.EqualTo(2));

        Assert.That(splitSolution.GetTotalPrototypeQuantity("water").Float(), Is.EqualTo(0.34f));
        Assert.That(splitSolution.GetTotalPrototypeQuantity("fire").Float(), Is.EqualTo(0.66f));
        Assert.That(splitSolution.Volume.Int(), Is.EqualTo(1));
    }

    [Test]
    public void SplitSolutionFractionalOpposite()
    {
        var solution = new Solution();
        solution.AddReagent("water", FixedPoint2.New(1));
        solution.AddReagent("fire", FixedPoint2.New(2));

        var splitSolution = solution.SplitSolution(FixedPoint2.New(2));

        Assert.That(solution.GetTotalPrototypeQuantity("water").Float(), Is.EqualTo(0.33f));
        Assert.That(solution.GetTotalPrototypeQuantity("fire").Float(), Is.EqualTo(0.67f));
        Assert.That(solution.Volume.Int(), Is.EqualTo(1));

        Assert.That(splitSolution.GetTotalPrototypeQuantity("water").Float(), Is.EqualTo(0.67f));
        Assert.That(splitSolution.GetTotalPrototypeQuantity("fire").Float(), Is.EqualTo(1.33f));
        Assert.That(splitSolution.Volume.Int(), Is.EqualTo(2));
    }

    [Test]
    [TestCase(0.03f, 0.01f, 0.02f)]
    [TestCase(0.03f, 0.02f, 0.01f)]
    public void SplitSolutionTinyFractionalBigSmall(float initial, float reduce, float remainder)
    {
        var solution = new Solution();
        solution.AddReagent("water", FixedPoint2.New(initial));

        var splitSolution = solution.SplitSolution(FixedPoint2.New(reduce));

        Assert.That(solution.GetTotalPrototypeQuantity("water").Float(), Is.EqualTo(remainder));
        Assert.That(solution.Volume.Float(), Is.EqualTo(remainder));

        Assert.That(splitSolution.GetTotalPrototypeQuantity("water").Float(), Is.EqualTo(reduce));
        Assert.That(splitSolution.Volume.Float(), Is.EqualTo(reduce));
    }

    [Test]
    [TestCase(2)]
    [TestCase(10)]
    [TestCase(100)]
    [TestCase(1000)]
    public void SplitRounding(int amount)
    {
        var solutionOne = new Solution();
        solutionOne.AddReagent("foo", FixedPoint2.New(amount));
        solutionOne.AddReagent("bar", FixedPoint2.New(amount));
        solutionOne.AddReagent("baz", FixedPoint2.New(amount));

        var splitAmount = FixedPoint2.New(5);
        var split = solutionOne.SplitSolution(splitAmount);

        Assert.That(split.Volume, Is.EqualTo(splitAmount));
    }

    [Test]
    public void SplitSolutionMoreThanTotalRemovesAll()
    {
        var solution = new Solution("water", FixedPoint2.New(800));

        var splitSolution = solution.SplitSolution(FixedPoint2.New(1000));

        Assert.That(solution.GetTotalPrototypeQuantity("water").Int(), Is.EqualTo(0));
        Assert.That(solution.Volume.Int(), Is.EqualTo(0));

        Assert.That(splitSolution.GetTotalPrototypeQuantity("water").Int(), Is.EqualTo(800));
        Assert.That(splitSolution.Volume.Int(), Is.EqualTo(800));
    }

    [Test]
    public void SplitSolutionLessThanOneDoesNothing()
    {
        var solution = new Solution("water", FixedPoint2.New(800));

        var splitSolution = solution.SplitSolution(FixedPoint2.New(-200));

        Assert.That(solution.GetTotalPrototypeQuantity("water").Int(), Is.EqualTo(800));
        Assert.That(solution.Volume.Int(), Is.EqualTo(800));

        Assert.That(splitSolution.GetTotalPrototypeQuantity("water").Int(), Is.EqualTo(0));
        Assert.That(splitSolution.Volume.Int(), Is.EqualTo(0));
    }

    [Test]
    public void SplitSolutionZero()
    {
        var solution = new Solution();
        solution.AddReagent("Impedrezene", FixedPoint2.New(0.01 + 0.19));
        solution.AddReagent("Thermite", FixedPoint2.New(0.01 + 0.39));
        solution.AddReagent("Li", FixedPoint2.New(0.01 + 0.17));
        solution.AddReagent("F", FixedPoint2.New(0.01 + 0.17));
        solution.AddReagent("Na", FixedPoint2.New(0 + 0.13));
        solution.AddReagent("Hg", FixedPoint2.New(0.15 + 4.15));
        solution.AddReagent("Cu", FixedPoint2.New(0 + 0.13));
        solution.AddReagent("U", FixedPoint2.New(0.76 + 20.77));
        solution.AddReagent("Fe", FixedPoint2.New(0.01 + 0.36));
        solution.AddReagent("SpaceDrugs", FixedPoint2.New(0.02 + 0.41));
        solution.AddReagent("Al", FixedPoint2.New(0));
        solution.AddReagent("Glucose", FixedPoint2.New(0));
        solution.AddReagent("O", FixedPoint2.New(0));

        solution.SplitSolution(FixedPoint2.New(0.98));
    }

    [Test]
    public void AddSolution()
    {
        var solutionOne = new Solution();
        solutionOne.AddReagent("water", FixedPoint2.New(1000));
        solutionOne.AddReagent("fire", FixedPoint2.New(2000));

        var solutionTwo = new Solution();
        solutionTwo.AddReagent("water", FixedPoint2.New(500));
        solutionTwo.AddReagent("earth", FixedPoint2.New(1000));

        solutionOne.AddSolution(solutionTwo, null);

        Assert.That(solutionOne.GetTotalPrototypeQuantity("water").Int(), Is.EqualTo(1500));
        Assert.That(solutionOne.GetTotalPrototypeQuantity("fire").Int(), Is.EqualTo(2000));
        Assert.That(solutionOne.GetTotalPrototypeQuantity("earth").Int(), Is.EqualTo(1000));
        Assert.That(solutionOne.Volume.Int(), Is.EqualTo(4500));
    }

    // Tests concerning thermal energy and temperature.

    #region Thermal Energy and Temperature

    [Test]
    public void EmptySolutionHasNoHeatCapacity()
    {
        var solution = new Solution();
        Assert.That(solution.GetHeatCapacity(null), Is.EqualTo(0.0f));
    }

    [Test]
    public void AddReagentWithNullTemperatureDoesNotEffectTemperature()
    {
        const float initialTemp = 100.0f;

        var solution = new Solution("water", FixedPoint2.New(100)) { Temperature = initialTemp };

        solution.AddReagent("water", FixedPoint2.New(100));
        Assert.That(solution.Temperature, Is.EqualTo(initialTemp));

        solution.AddReagent("earth", FixedPoint2.New(100));
        Assert.That(solution.Temperature, Is.EqualTo(initialTemp));
    }

    [Test]
    public void AddSolutionWithEqualTemperatureDoesNotChangeTemperature()
    {
        const float initialTemp = 100.0f;

        var solutionOne = new Solution();
        solutionOne.AddReagent("water", FixedPoint2.New(100));
        solutionOne.Temperature = initialTemp;

        var solutionTwo = new Solution();
        solutionTwo.AddReagent("water", FixedPoint2.New(100));
        solutionTwo.AddReagent("earth", FixedPoint2.New(100));
        solutionTwo.Temperature = initialTemp;

        solutionOne.AddSolution(solutionTwo, null);
        Assert.That(solutionOne.Temperature, Is.EqualTo(initialTemp));
    }

    [Test]
    public void RemoveReagentDoesNotEffectTemperature()
    {
        const float initialTemp = 100.0f;

        var solution = new Solution("water", FixedPoint2.New(100)) { Temperature = initialTemp };
        solution.RemoveReagent("water", FixedPoint2.New(50));
        Assert.That(solution.Temperature, Is.EqualTo(initialTemp));
    }

    [Test]
    public void RemoveSolutionDoesNotEffectTemperature()
    {
        const float initialTemp = 100.0f;

        var solution = new Solution("water", FixedPoint2.New(100)) { Temperature = initialTemp };
        solution.RemoveSolution(FixedPoint2.New(50));
        Assert.That(solution.Temperature, Is.EqualTo(initialTemp));
    }

    [Test]
    public void SplitSolutionDoesNotEffectTemperature()
    {
        const float initialTemp = 100.0f;

        var solution = new Solution("water", FixedPoint2.New(100)) { Temperature = initialTemp };
        solution.SplitSolution(FixedPoint2.New(50));
        Assert.That(solution.Temperature, Is.EqualTo(initialTemp));
    }

    #endregion Thermal Energy and Temperature
}