// 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.

#nullable disable

using System.Linq;
using NUnit.Framework;
using osu.Framework.Testing;
using osu.Framework.Utils;
using osu.Game.Beatmaps;
using osu.Game.Rulesets;
using osu.Game.Rulesets.Edit;
using osu.Game.Rulesets.Objects;
using osu.Game.Rulesets.Objects.Types;
using osu.Game.Rulesets.Osu;
using osu.Game.Rulesets.Osu.Objects;
using osu.Game.Screens.Edit.Compose.Components;
using osu.Game.Screens.Edit.Compose.Components.Timeline;
using osu.Game.Tests.Beatmaps;
using osuTK;

namespace osu.Game.Tests.Visual.Editing
{
    public class TestSceneEditorClipboard : EditorTestScene
    {
        protected override Ruleset CreateEditorRuleset() => new OsuRuleset();

        protected override IBeatmap CreateBeatmap(RulesetInfo ruleset) => new TestBeatmap(ruleset, false);

        [Test]
        public void TestCutRemovesObjects()
        {
            var addedObject = new HitCircle { StartTime = 1000 };

            AddStep("add hitobject", () => EditorBeatmap.Add(addedObject));

            AddStep("select added object", () => EditorBeatmap.SelectedHitObjects.Add(addedObject));

            AddStep("cut hitobject", () => Editor.Cut());

            AddAssert("no hitobjects in beatmap", () => EditorBeatmap.HitObjects.Count == 0);
        }

        [TestCase(1000)]
        [TestCase(2000)]
        public void TestCutPaste(double newTime)
        {
            var addedObject = new HitCircle { StartTime = 1000 };

            AddStep("add hitobject", () => EditorBeatmap.Add(addedObject));

            AddStep("select added object", () => EditorBeatmap.SelectedHitObjects.Add(addedObject));

            AddStep("cut hitobject", () => Editor.Cut());

            AddStep("move forward in time", () => EditorClock.Seek(newTime));

            AddStep("paste hitobject", () => Editor.Paste());

            AddAssert("is one object", () => EditorBeatmap.HitObjects.Count == 1);

            AddAssert("new object selected", () => EditorBeatmap.SelectedHitObjects.Single().StartTime == newTime);
        }

        [Test]
        public void TestCutPasteSlider()
        {
            var addedObject = new Slider
            {
                StartTime = 1000,
                Path = new SliderPath
                {
                    ControlPoints =
                    {
                        new PathControlPoint(),
                        new PathControlPoint(new Vector2(100, 0), PathType.Bezier)
                    }
                }
            };

            AddStep("add hitobject", () => EditorBeatmap.Add(addedObject));

            AddStep("select added object", () => EditorBeatmap.SelectedHitObjects.Add(addedObject));

            AddStep("cut hitobject", () => Editor.Cut());

            AddStep("paste hitobject", () => Editor.Paste());

            AddAssert("is one object", () => EditorBeatmap.HitObjects.Count == 1);

            Slider slider = null;
            AddStep("retrieve slider", () => slider = (Slider)EditorBeatmap.HitObjects.Single());
            AddAssert("path matches", () =>
            {
                var path = slider.Path;
                return path.ControlPoints.Count == 2 && path.ControlPoints.SequenceEqual(addedObject.Path.ControlPoints);
            });

            // see `HitObject.control_point_leniency`.
            AddAssert("sample control point has correct time", () => Precision.AlmostEquals(slider.SampleControlPoint.Time, slider.GetEndTime(), 1));
            AddAssert("difficulty control point has correct time", () => slider.DifficultyControlPoint.Time == slider.StartTime);
        }

        [Test]
        public void TestCutPasteSpinner()
        {
            var addedObject = new Spinner
            {
                StartTime = 1000,
                Duration = 5000
            };

            AddStep("add hitobject", () => EditorBeatmap.Add(addedObject));

            AddStep("select added object", () => EditorBeatmap.SelectedHitObjects.Add(addedObject));

            AddStep("cut hitobject", () => Editor.Cut());

            AddStep("paste hitobject", () => Editor.Paste());

            AddAssert("is one object", () => EditorBeatmap.HitObjects.Count == 1);

            AddAssert("duration matches", () => ((Spinner)EditorBeatmap.HitObjects.Single()).Duration == 5000);
        }

        [TestCase(false)]
        [TestCase(true)]
        public void TestCopyPaste(bool deselectAfterCopy)
        {
            var addedObject = new HitCircle { StartTime = 1000 };

            AddStep("add hitobject", () => EditorBeatmap.Add(addedObject));

            AddStep("select added object", () => EditorBeatmap.SelectedHitObjects.Add(addedObject));

            AddStep("copy hitobject", () => Editor.Copy());

            AddStep("move forward in time", () => EditorClock.Seek(2000));

            if (deselectAfterCopy)
            {
                AddStep("deselect", () => EditorBeatmap.SelectedHitObjects.Clear());

                AddUntilStep("timeline selection box is not visible", () => Editor.ChildrenOfType<Timeline>().First().ChildrenOfType<SelectionBox>().First().Alpha == 0);
                AddUntilStep("composer selection box is not visible", () => Editor.ChildrenOfType<HitObjectComposer>().First().ChildrenOfType<SelectionBox>().First().Alpha == 0);
            }

            AddStep("paste hitobject", () => Editor.Paste());

            AddAssert("are two objects", () => EditorBeatmap.HitObjects.Count == 2);

            AddAssert("new object selected", () => EditorBeatmap.SelectedHitObjects.Single().StartTime == 2000);

            AddUntilStep("timeline selection box is visible", () => Editor.ChildrenOfType<Timeline>().First().ChildrenOfType<EditorSelectionHandler>().First().Alpha > 0);
            AddUntilStep("composer selection box is visible", () => Editor.ChildrenOfType<HitObjectComposer>().First().ChildrenOfType<EditorSelectionHandler>().First().Alpha > 0);
        }

        [Test]
        public void TestClone()
        {
            var addedObject = new HitCircle { StartTime = 1000 };
            AddStep("add hitobject", () => EditorBeatmap.Add(addedObject));
            AddStep("select added object", () => EditorBeatmap.SelectedHitObjects.Add(addedObject));

            AddAssert("is one object", () => EditorBeatmap.HitObjects.Count == 1);
            AddStep("clone", () => Editor.Clone());
            AddAssert("is two objects", () => EditorBeatmap.HitObjects.Count == 2);
            AddStep("clone", () => Editor.Clone());
            AddAssert("is three objects", () => EditorBeatmap.HitObjects.Count == 3);
        }

        [Test]
        public void TestCutNothing()
        {
            AddStep("cut hitobject", () => Editor.Cut());
            AddAssert("are no objects", () => EditorBeatmap.HitObjects.Count == 0);
        }

        [Test]
        public void TestCopyNothing()
        {
            AddStep("copy hitobject", () => Editor.Copy());
            AddAssert("are no objects", () => EditorBeatmap.HitObjects.Count == 0);
        }

        [Test]
        public void TestPasteNothing()
        {
            AddStep("paste hitobject", () => Editor.Paste());
            AddAssert("are no objects", () => EditorBeatmap.HitObjects.Count == 0);
        }

        [Test]
        public void TestCloneNothing()
        {
            // Add arbitrary object and copy to clipboard.
            // This is tested to ensure that clone doesn't incorrectly read from the clipboard when no selection is made.
            var addedObject = new HitCircle { StartTime = 1000 };
            AddStep("add hitobject", () => EditorBeatmap.Add(addedObject));
            AddStep("select added object", () => EditorBeatmap.SelectedHitObjects.Add(addedObject));
            AddStep("copy hitobject", () => Editor.Copy());

            AddStep("deselect all objects", () => EditorBeatmap.SelectedHitObjects.Clear());

            AddAssert("is one object", () => EditorBeatmap.HitObjects.Count == 1);
            AddStep("clone", () => Editor.Clone());
            AddAssert("still one object", () => EditorBeatmap.HitObjects.Count == 1);
        }
    }
}