// Copyright (c) Wojciech Figat. All rights reserved.

#if FLAX_TESTS
using FlaxEngine.GUI;
using NUnit.Framework;
using Assert = FlaxEngine.Assertions.Assert;

namespace FlaxEngine.Tests
{
    [TestFixture]
    public class TestContainerControl
    {
        public class MyControl : Control
        {
            public MyControl(float x, float y, float width, float height)
            : base(x, y, width, height)
            {
            }
        }

        public class MyContainerControl : ContainerControl
        {
            public MyContainerControl(float x, float y, float width, float height)
            : base(x, y, width, height)
            {
            }
        }

        private sealed class RemovingControl : MyControl
        {
            private readonly Control[] _controlsToRemove;

            public RemovingControl(float x, float y, float width, float height, params Control[] controlsToRemove)
            : base(x, y, width, height)
            {
                _controlsToRemove = controlsToRemove;
            }

            public override void OnMouseEnter(Float2 location)
            {
                for (int i = 0; i < _controlsToRemove.Length; i++)
                {
                    var control = _controlsToRemove[i];
                    if (control.Parent == Parent)
                        control.Parent = null;
                }

                base.OnMouseEnter(location);
            }
        }

        [Test]
        public void TestChildren()
        {
            var c1 = new MyControl(0, 0, 10, 20);
            var c2 = new MyControl(0, 10, 10, 20);
            var c3 = new MyControl(10, 0, 10, 20);

            var cc1 = new MyContainerControl(0, 0, 100, 100);
            var cc2 = new MyContainerControl(10, 0, 100, 100);
            var cc3 = new MyContainerControl(10, 10, 100, 100);

            cc1.AddChild(cc2);
            cc2.AddChild(cc3);
            cc3.AddChild(c1);
            cc3.AddChild(c2);
            cc3.AddChild(c3);

            Assert.IsTrue(cc1.Parent == null);
            Assert.IsTrue(cc2.Parent == cc1);
            Assert.IsTrue(cc3.Parent == cc2);
            Assert.IsTrue(c1.Parent == cc3);
            Assert.IsTrue(c2.Parent == cc3);
            Assert.IsTrue(c3.Parent == cc3);

            Assert.AreEqual(cc1.GetChildAt(new Vector2(15, 5)), cc2);
            Assert.AreEqual(cc1.GetChildAtRecursive(new Vector2(35, 25)), c3);
        }

        [Test]
        public void TestMouseMoveAllowsChildrenRemoval()
        {
            var container = new MyContainerControl(0, 0, 100, 100);
            var first = new MyControl(0, 0, 100, 100);
            var second = new MyControl(0, 0, 100, 100);
            var removing = new RemovingControl(0, 0, 100, 100, first, second);
            container.AddChild(first);
            container.AddChild(second);
            container.AddChild(removing);

            // The top-most child removes multiple siblings during input dispatch.
            // Traversal must not use the now-stale next index.
            container.OnMouseMove(new Float2(50, 50));

            Assert.AreEqual(1, container.ChildrenCount);
            Assert.AreEqual(removing, container.GetChild(0));
        }
    }
}
#endif