// 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 System.Linq;
using NUnit.Framework;
using osu.Framework.Testing;
using osu.Framework.Utils;
using osu.Game.Rulesets.Edit;
using osu.Game.Rulesets.Osu.Edit;
using osu.Game.Rulesets.Osu.Edit.Blueprints.HitCircles;
using osu.Game.Tests.Visual;
using osuTK;
using osuTK.Input;

namespace osu.Game.Rulesets.Osu.Tests.Editor
{
    public partial class TestSceneOsuEditorGrids : EditorTestScene
    {
        protected override Ruleset CreateEditorRuleset() => new OsuRuleset();

        [Test]
        public void TestGridToggles()
        {
            AddStep("enable distance snap grid", () => InputManager.Key(Key.T));
            AddStep("select second object", () => EditorBeatmap.SelectedHitObjects.Add(EditorBeatmap.HitObjects.ElementAt(1)));

            AddUntilStep("distance snap grid visible", () => this.ChildrenOfType<OsuDistanceSnapGrid>().Any());
            rectangularGridActive(false);

            AddStep("enable rectangular grid", () => InputManager.Key(Key.Y));

            AddStep("select second object", () => EditorBeatmap.SelectedHitObjects.Add(EditorBeatmap.HitObjects.ElementAt(1)));
            AddUntilStep("distance snap grid still visible", () => this.ChildrenOfType<OsuDistanceSnapGrid>().Any());
            rectangularGridActive(true);

            AddStep("disable distance snap grid", () => InputManager.Key(Key.T));
            AddUntilStep("distance snap grid hidden", () => !this.ChildrenOfType<OsuDistanceSnapGrid>().Any());
            AddStep("select second object", () => EditorBeatmap.SelectedHitObjects.Add(EditorBeatmap.HitObjects.ElementAt(1)));
            rectangularGridActive(true);

            AddStep("disable rectangular grid", () => InputManager.Key(Key.Y));
            AddUntilStep("distance snap grid still hidden", () => !this.ChildrenOfType<OsuDistanceSnapGrid>().Any());
            rectangularGridActive(false);
        }

        [Test]
        public void TestDistanceSnapMomentaryToggle()
        {
            AddStep("select second object", () => EditorBeatmap.SelectedHitObjects.Add(EditorBeatmap.HitObjects.ElementAt(1)));

            AddUntilStep("distance snap grid hidden", () => !this.ChildrenOfType<OsuDistanceSnapGrid>().Any());
            AddStep("hold alt", () => InputManager.PressKey(Key.AltLeft));
            AddUntilStep("distance snap grid visible", () => this.ChildrenOfType<OsuDistanceSnapGrid>().Any());
            AddStep("release alt", () => InputManager.ReleaseKey(Key.AltLeft));
            AddUntilStep("distance snap grid hidden", () => !this.ChildrenOfType<OsuDistanceSnapGrid>().Any());

            AddStep("enable distance snap grid", () => InputManager.Key(Key.T));
            AddUntilStep("distance snap grid visible", () => this.ChildrenOfType<OsuDistanceSnapGrid>().Any());
            AddStep("hold alt", () => InputManager.PressKey(Key.AltLeft));
            AddUntilStep("distance snap grid hidden", () => !this.ChildrenOfType<OsuDistanceSnapGrid>().Any());
            AddStep("release alt", () => InputManager.ReleaseKey(Key.AltLeft));
            AddUntilStep("distance snap grid visible", () => this.ChildrenOfType<OsuDistanceSnapGrid>().Any());
        }

        [Test]
        public void TestDistanceSnapAdjustDoesNotHideTheGridIfStartingEnabled()
        {
            double distanceSnap = double.PositiveInfinity;

            AddStep("enable distance snap grid", () => InputManager.Key(Key.T));

            AddStep("select second object", () => EditorBeatmap.SelectedHitObjects.Add(EditorBeatmap.HitObjects.ElementAt(1)));
            AddUntilStep("distance snap grid visible", () => this.ChildrenOfType<OsuDistanceSnapGrid>().Any());
            AddStep("store distance snap", () => distanceSnap = this.ChildrenOfType<IDistanceSnapProvider>().First().DistanceSpacingMultiplier.Value);

            AddStep("increase distance", () =>
            {
                InputManager.PressKey(Key.AltLeft);
                InputManager.PressKey(Key.ControlLeft);
                InputManager.ScrollVerticalBy(1);
                InputManager.ReleaseKey(Key.ControlLeft);
                InputManager.ReleaseKey(Key.AltLeft);
            });

            AddUntilStep("distance snap increased", () => this.ChildrenOfType<IDistanceSnapProvider>().First().DistanceSpacingMultiplier.Value, () => Is.GreaterThan(distanceSnap));
            AddUntilStep("distance snap grid still visible", () => this.ChildrenOfType<OsuDistanceSnapGrid>().Any());
        }

        [Test]
        public void TestDistanceSnapAdjustShowsGridMomentarilyIfStartingDisabled()
        {
            double distanceSnap = double.PositiveInfinity;

            AddStep("select second object", () => EditorBeatmap.SelectedHitObjects.Add(EditorBeatmap.HitObjects.ElementAt(1)));
            AddUntilStep("distance snap grid hidden", () => !this.ChildrenOfType<OsuDistanceSnapGrid>().Any());
            AddStep("store distance snap", () => distanceSnap = this.ChildrenOfType<IDistanceSnapProvider>().First().DistanceSpacingMultiplier.Value);

            AddStep("start increasing distance", () =>
            {
                InputManager.PressKey(Key.AltLeft);
                InputManager.PressKey(Key.ControlLeft);
            });

            AddUntilStep("distance snap grid visible", () => this.ChildrenOfType<OsuDistanceSnapGrid>().Any());

            AddStep("finish increasing distance", () =>
            {
                InputManager.ScrollVerticalBy(1);
                InputManager.ReleaseKey(Key.ControlLeft);
                InputManager.ReleaseKey(Key.AltLeft);
            });

            AddUntilStep("distance snap increased", () => this.ChildrenOfType<IDistanceSnapProvider>().First().DistanceSpacingMultiplier.Value, () => Is.GreaterThan(distanceSnap));
            AddUntilStep("distance snap hidden in the end", () => !this.ChildrenOfType<OsuDistanceSnapGrid>().Any());
        }

        [Test]
        public void TestGridSnapMomentaryToggle()
        {
            rectangularGridActive(false);
            AddStep("hold shift", () => InputManager.PressKey(Key.ShiftLeft));
            rectangularGridActive(true);
            AddStep("release shift", () => InputManager.ReleaseKey(Key.ShiftLeft));
            rectangularGridActive(false);
        }

        private void rectangularGridActive(bool active)
        {
            AddStep("choose placement tool", () => InputManager.Key(Key.Number2));
            AddStep("move cursor to (1, 1)", () =>
            {
                var composer = Editor.ChildrenOfType<OsuRectangularPositionSnapGrid>().Single();
                InputManager.MoveMouseTo(composer.ToScreenSpace(new Vector2(1, 1)));
            });

            if (active)
                AddAssert("placement blueprint at (0, 0)", () => Precision.AlmostEquals(Editor.ChildrenOfType<HitCirclePlacementBlueprint>().Single().HitObject.Position, new Vector2(0, 0)));
            else
                AddAssert("placement blueprint at (1, 1)", () => Precision.AlmostEquals(Editor.ChildrenOfType<HitCirclePlacementBlueprint>().Single().HitObject.Position, new Vector2(1, 1)));
        }

        [Test]
        public void TestGridSizeToggling()
        {
            AddStep("enable rectangular grid", () => InputManager.Key(Key.Y));
            AddUntilStep("rectangular grid visible", () => this.ChildrenOfType<OsuRectangularPositionSnapGrid>().Any());
            gridSizeIs(4);

            nextGridSizeIs(8);
            nextGridSizeIs(16);
            nextGridSizeIs(32);
            nextGridSizeIs(4);
        }

        private void nextGridSizeIs(int size)
        {
            AddStep("toggle to next grid size", () => InputManager.Key(Key.G));
            gridSizeIs(size);
        }

        private void gridSizeIs(int size)
            => AddAssert($"grid size is {size}", () => this.ChildrenOfType<OsuRectangularPositionSnapGrid>().Single().Spacing == new Vector2(size)
                                                       && EditorBeatmap.BeatmapInfo.GridSize == size);
    }
}