// 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.Graphics;
using osu.Framework.Graphics.Containers;
using osu.Framework.Graphics.Lines;
using osu.Framework.Graphics.Shapes;
using osu.Framework.Graphics.Sprites;
using osu.Framework.Input.Events;
using osuTK;
using osuTK.Graphics;

namespace osu.Framework.Tests.Visual.Input
{
    public class TestScenePathInput : FrameworkTestScene
    {
        private const float path_width = 50;
        private const float path_radius = path_width / 2;

        private Path path;
        private TestPoint testPoint;
        private SpriteText text;

        [Test]
        public void Setup() => Schedule(() =>
        {
            Children = new Drawable[]
            {
                path = new HoverablePath(),
                testPoint = new TestPoint(),
                text = new SpriteText { Anchor = Anchor.TopCentre, Origin = Anchor.TopCentre }
            };
        });

        [Test]
        public void TestHorizontalPath()
        {
            addPath("Horizontal path", new Vector2(100), new Vector2(300, 100));
            // Left out
            test(new Vector2(40, 100), false);
            // Left in
            test(new Vector2(80, 100), true);
            // Cap out
            test(new Vector2(60), false);
            // Cap in
            test(new Vector2(70), true);
            //Right out
            test(new Vector2(360, 100), false);
            // Centre
            test(new Vector2(200, 100), true);
            // Top out
            test(new Vector2(190, 40), false);
            // Top in
            test(new Vector2(190, 60), true);
        }

        [Test]
        public void TestDiagonalPath()
        {
            addPath("Diagonal path", new Vector2(300), new Vector2(100));
            // Top-left out
            test(new Vector2(50), false);
            // Top-left in
            test(new Vector2(80), true);
            // Left out
            test(new Vector2(145, 235), false);
            // Left in
            test(new Vector2(170, 235), true);
            // Cap out
            test(new Vector2(355, 300), false);
            // Cap in
            test(new Vector2(340, 300), true);
        }

        [Test]
        public void TestVShaped()
        {
            addPath("V-shaped", new Vector2(100), new Vector2(300), new Vector2(500, 100));
            // Intersection out
            test(new Vector2(300, 225), false);
            // Intersection in
            test(new Vector2(300, 240), true);
            // Bottom cap out
            test(new Vector2(300, 355), false);
            // Bottom cap in
            test(new Vector2(300, 340), true);
        }

        [Test]
        public void TestOverlapping()
        {
            addPath("Overlapping", new Vector2(100), new Vector2(600), new Vector2(800, 300), new Vector2(100, 400));
            // Left intersection out
            test(new Vector2(250, 325), false);
            // Left intersection in
            test(new Vector2(260, 325), true);
            // Top intersection out
            test(new Vector2(380, 300), false);
            // Top intersection in
            test(new Vector2(380, 320), true);
            // Triangle left intersection out
            test(new Vector2(475, 400), false);
            // Triangle left intersection in
            test(new Vector2(460, 400), true);
            // Triangle right intersection out
            test(new Vector2(690, 370), false);
            // Triangle right intersection in
            test(new Vector2(700, 370), true);
            // Triangle bottom intersection out
            test(new Vector2(590, 515), false);
            // Triangle bottom intersection in
            test(new Vector2(590, 525), true);
            // Centre intersection in
            test(new Vector2(370, 360), true);
        }

        protected override bool OnMouseMove(MouseMoveEvent e)
        {
            text.Text = path.ToLocalSpace(e.ScreenSpaceMousePosition).ToString();
            return base.OnMouseMove(e);
        }

        private void addPath(string name, params Vector2[] vertices) => AddStep(name, () =>
        {
            path.PathRadius = path_width;
            path.Vertices = vertices.ToList();
        });

        private void test(Vector2 position, bool shouldReceivePositionalInput)
        {
            AddAssert($"Test @ {position} = {shouldReceivePositionalInput}", () =>
            {
                testPoint.Position = position;
                return path.ReceivePositionalInputAt(path.ToScreenSpace(position)) == shouldReceivePositionalInput;
            });
        }

        private class TestPoint : CircularContainer
        {
            public TestPoint()
            {
                Origin = Anchor.Centre;

                Size = new Vector2(5);
                Colour = Color4.Red;
                Masking = true;

                InternalChild = new Box { RelativeSizeAxes = Axes.Both };
            }
        }

        private class HoverablePath : Path
        {
            protected override bool OnHover(HoverEvent e)
            {
                Colour = Color4.Green;
                return true;
            }

            protected override void OnHoverLost(HoverLostEvent e)
            {
                Colour = Color4.White;
            }
        }
    }
}