// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE

using NUnit.Framework;
using osu.Framework.Lists;
using osu.Game.Rulesets.Timing;
using osu.Game.Rulesets.UI.Scrolling.Algorithms;

namespace osu.Game.Tests.ScrollAlgorithms
{
    [TestFixture]
    public class SequentialScrollTest
    {
        private IScrollAlgorithm algorithm;

        [SetUp]
        public void Setup()
        {
            var controlPoints = new SortedList<MultiplierControlPoint>
            {
                new MultiplierControlPoint(0) { Velocity = 1 },
                new MultiplierControlPoint(10000) { Velocity = 2f },
                new MultiplierControlPoint(20000) { Velocity = 0.5f }
            };

            algorithm = new SequentialScrollAlgorithm(controlPoints);
        }

        [Test]
        public void TestDisplayStartTime()
        {
            // Sequential scroll algorithm approximates the start time
            // This should be fixed in the future
        }

        [Test]
        public void TestLength()
        {
            Assert.AreEqual(1f / 5, algorithm.GetLength(0, 1000, 5000, 1)); // Like constant
            Assert.AreEqual(1f / 5, algorithm.GetLength(10000, 10500, 5000, 1)); // (10500 - 10000) / 0.5 / 5000
            Assert.AreEqual(1f / 5, algorithm.GetLength(20000, 22000, 5000, 1)); // (22000 - 20000) * 0.5 / 5000
        }

        [Test]
        public void TestPosition()
        {
            // Basically same calculations as TestLength()
            Assert.AreEqual(1f / 5, algorithm.PositionAt(1000, 0, 5000, 1));
            Assert.AreEqual(1f / 5, algorithm.PositionAt(10500, 10000, 5000, 1));
            Assert.AreEqual(1f / 5, algorithm.PositionAt(22000, 20000, 5000, 1));
        }

        [TestCase(1000)]
        [TestCase(10000)]
        [TestCase(15000)]
        [TestCase(20000)]
        [TestCase(25000)]
        public void TestTime(double time)
        {
            Assert.AreEqual(time, algorithm.TimeAt(algorithm.PositionAt(time, 0, 5000, 1), 0, 5000, 1), 0.001);
            Assert.AreEqual(time, algorithm.TimeAt(algorithm.PositionAt(time, 5000, 5000, 1), 5000, 5000, 1), 0.001);
        }
    }
}