// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
// See the LICENCE file in the repository root for full licence text.

using NUnit.Framework;
using osu.Framework.Configuration;
using osu.Game.Graphics;
using osu.Game.Rulesets;
using osu.Game.Rulesets.Osu;
using osu.Game.Scoring;
using osu.Game.Screens;
using osu.Game.Screens.Backgrounds;
using osu.Game.Screens.Play;
using osu.Game.Screens.Select;
using osu.Game.Users;
using osuTK.Graphics;

namespace osu.Game.Tests.Visual
{
    [TestFixture]
    public class TestCaseBackgroundScreenBeatmap : TestCasePlayer
    {
        public TestCaseBackgroundScreenBeatmap() : base(new OsuRuleset())
        {
        }

        [SetUp]
        public void Setup()
        {
            ((DimAccessiblePlayer)Player).UpdateBindables();
        }

        /// <summary>
        /// Check if the fade container is properly being reset when screen dim is disabled.
        /// </summary>
        [Test]
        public void DisableUserDimTest()
        {
            AddStep("Test User Undimming", () => ((DimAccessiblePlayer)Player).DimEnabled.Value = false);
            AddWaitStep(5, "Wait for dim");
            AddAssert("Screen is undimmed", () => ((DimAccessiblePlayer)Player).AssertUndimmed());
        }

        /// <summary>
        /// Check if the fade container is properly being faded when screen dim is enabled.
        /// </summary>
        [Test]
        public void EnableUserDimTest()
        {
            AddStep("Test User Dimming", () => ((DimAccessiblePlayer)Player).DimEnabled.Value = true);
            AddWaitStep(5, "Wait for dim");
            AddAssert("Screen is dimmed", () => ((DimAccessiblePlayer)Player).AssertDimState());
        }

        /// <summary>
        /// Check if the fade container retains dim when pausing
        /// </summary>
        [Test]
        public void PauseTest()
        {
            AddStep("Transition to Results", () => ((DimAccessiblePlayer)Player).TriggerExit());
            AddWaitStep(5, "Wait for dim");
            AddAssert("Screen is dimmed", () => ((DimAccessiblePlayer)Player).AssertDimState());
        }

        /// <summary>
        /// Check if the fade container removes user dim when leaving the player
        /// </summary>
        [Test]
        public void TransitionTest()
        {
            AddStep("Transition to Results", () => LoadScreen(new FadeAccesibleResults(new ScoreInfo { User = new User { Username = "osu!" }})));
            AddWaitStep(5, "Wait for dim");
            AddAssert("Screen is undimmed", () => ((DimAccessiblePlayer)Player).AssertUndimmed());
        }

        protected override Player CreatePlayer(Ruleset ruleset) => new DimAccessiblePlayer();

        private class FadeAccesibleResults : SoloResults
        {
            public FadeAccesibleResults(ScoreInfo score) : base(score)
            {
            }

            protected override BackgroundScreen CreateBackground() => new FadeAccessibleBackground();
        }

        private class DimAccessiblePlayer : Player
        {
            public Bindable<bool> DimEnabled;

            protected override BackgroundScreen CreateBackground() => new FadeAccessibleBackground();

            public void UpdateBindables()
            {
                DimEnabled = Background.UpdateDim;
            }

            public bool AssertDimState()
            {
                return ((FadeAccessibleBackground)Background).AssertDimState();
            }

            public bool AssertUndimmed()
            {
                return ((FadeAccessibleBackground)Background).AssertUndimmed();
            }

            public void TriggerExit()
            {
                OnExiting(new PlaySongSelect());
            }
        }

        private class FadeAccessibleBackground : BackgroundScreenBeatmap
        {
            public bool AssertDimState()
            {
                return FadeContainer.Colour == OsuColour.Gray(1 - (float)DimLevel);
            }

            public bool AssertUndimmed()
            {
                return FadeContainer.Colour == Color4.White;
            }
        }
    }
}