using System.Collections;
using BracerLib.Utility;
using BracerLib.Utility.Testing;
using NUnit.Framework;

namespace BracerLib.Tests.Utility
{
    public class MathUtilityTests : TestBase
    {
        private static IEnumerable BoundValues()
        {
            yield return new TestCaseData(2, 1, 3, 2).SetName("Value is between bounds");
            yield return new TestCaseData(0, 1, 3, 3).SetName("Value is below bounds");
            yield return new TestCaseData(4, 1, 3, 1).SetName("Value is above bounds");
        }

        private static IEnumerable BetweenValuesInt()
        {
            yield return new TestCaseData(0, -1, 1, BoundsInclusivity.None, true).SetName("Value is between bounds");
            yield return new TestCaseData(-2, -1, 1, BoundsInclusivity.None, false).SetName("Value is below bounds");
            yield return new TestCaseData(2, -1, 1, BoundsInclusivity.None, false).SetName("Value is above bounds");
            yield return new TestCaseData(-1, -1, 1, BoundsInclusivity.Both, true).SetName("Value is at bound, inclusive both");
            yield return new TestCaseData(-1, -1, 1, BoundsInclusivity.Left, true).SetName("Value is at bound, inclusive left");
            yield return new TestCaseData(1, -1, 1, BoundsInclusivity.Right, true).SetName("Value is at bound, inclusive right");
            yield return new TestCaseData(1, -1, 1, BoundsInclusivity.Both, true).SetName("Value is at bound, exclusive");
        }

        private static IEnumerable BetweenValuesFloat()
        {
            yield return new TestCaseData(0f, -1f, 1f, BoundsInclusivity.None, true).SetName("Value is between bounds");
            yield return new TestCaseData(-2f, -1f, 1f, BoundsInclusivity.None, false).SetName("Value is below bounds");
            yield return new TestCaseData(2f, -1f, 1f, BoundsInclusivity.None, false).SetName("Value is above bounds");
            yield return new TestCaseData(-1f, -1f, 1f, BoundsInclusivity.Both, true).SetName("Value is at bound, inclusive both");
            yield return new TestCaseData(-1f, -1f, 1f, BoundsInclusivity.Left, true).SetName("Value is at bound, inclusive left");
            yield return new TestCaseData(1f, -1f, 1f, BoundsInclusivity.Right, true).SetName("Value is at bound, inclusive right");
            yield return new TestCaseData(1f, -1f, 1f, BoundsInclusivity.Both, true).SetName("Value is at bound, exclusive");
        }

        [Test]
        [TestCaseSource(nameof(BoundValues))]
        public void ValuesAreWithinBounds(int value, int min, int max, int expected)
        {
            var result = MathUtility.KeepWithinBounds(value, min, max);
            Assert.That(result, Is.EqualTo(expected));
        }

        [Test]
        [TestCaseSource(nameof(BetweenValuesInt))]
        public void ValuesBetweenBounds(int value, int min, int max, BoundsInclusivity inclusivity, bool expected)
        {
            var result = MathUtility.IsBetween(value, min, max, inclusivity);
            Assert.That(result, Is.EqualTo(expected));
        }

        [Test]
        [TestCaseSource(nameof(BetweenValuesFloat))]
        public void ValuesBetweenBoundsFloat(float value, float min, float max, BoundsInclusivity inclusivity, bool expected)
        {
            var result = MathUtility.IsBetween(value, min, max, inclusivity);
            Assert.That(result, Is.EqualTo(expected));
        }
    }
}