using NUnit.Framework;
using Robust.Client.UserInterface;
using Robust.Client.UserInterface.Controls;
using Robust.Shared.IoC;

namespace Robust.UnitTesting.Client.UserInterface
{
    [TestFixture]
    public sealed class StylesheetTest : RobustUnitTest
    {
        public override UnitTestProject Project => UnitTestProject.Client;

        [OneTimeSetUp]
        public void Setup()
        {
            IoCManager.Resolve<IUserInterfaceManagerInternal>().InitializeTesting();
        }

        [Test]
        public void TestSelectors()
        {
            var selectorElementLabel = new SelectorElement(typeof(Label), null, null, null);

            var label = new Label();
            var panel = new PanelContainer {StyleIdentifier = "bar"};
            Assert.That(selectorElementLabel.Matches(label), Is.True);
            Assert.That(selectorElementLabel.Matches(panel), Is.False);

            selectorElementLabel = new SelectorElement(typeof(Label), new[] {"foo"}, null, null);
            Assert.That(selectorElementLabel.Matches(label), Is.False);
            Assert.That(selectorElementLabel.Matches(panel), Is.False);

            Assert.That(label.HasStyleClass("foo"), Is.False);
            label.AddStyleClass("foo");
            Assert.That(selectorElementLabel.Matches(label), Is.True);
            Assert.That(label.HasStyleClass("foo"));
            // Make sure it doesn't throw.
            label.AddStyleClass("foo");
            label.RemoveStyleClass("foo");
            Assert.That(selectorElementLabel.Matches(label), Is.False);
            Assert.That(label.HasStyleClass("foo"), Is.False);
            // Make sure it doesn't throw.
            label.RemoveStyleClass("foo");

            selectorElementLabel = new SelectorElement(null, null, "bar", null);
            Assert.That(selectorElementLabel.Matches(label), Is.False);
            Assert.That(selectorElementLabel.Matches(panel), Is.True);
        }

        [Test]
        public void TestStyleProperties()
        {
            var sheet = new Stylesheet(new[]
            {
                new StyleRule(new SelectorElement(typeof(Label), null, "baz", null), new[]
                {
                    new StyleProperty("foo", "honk"),
                }),
                new StyleRule(new SelectorElement(typeof(Label), null, null, null), new[]
                {
                    new StyleProperty("foo", "heh"),
                }),
                new StyleRule(new SelectorElement(typeof(Label), null, null, null), new[]
                {
                    new StyleProperty("foo", "bar"),
                }),
            });

            var uiMgr = IoCManager.Resolve<IUserInterfaceManager>();
            uiMgr.Stylesheet = sheet;

            var control = new Label();

            uiMgr.StateRoot.AddChild(control);
            control.ForceRunStyleUpdate();

            control.TryGetStyleProperty("foo", out string? value);
            Assert.That(value, Is.EqualTo("bar"));

            control.StyleIdentifier = "baz";
            control.ForceRunStyleUpdate();

            control.TryGetStyleProperty("foo", out value);
            Assert.That(value, Is.EqualTo("honk"));
        }

        [Test]
        public void TestStylesheetOverride()
        {
            var sheetA = new Stylesheet(new[]
            {
                new StyleRule(SelectorElement.Class("A"), new[] {new StyleProperty("foo", "bar")}),
            });

            var sheetB = new Stylesheet(new[]
            {
                new StyleRule(SelectorElement.Class("A"), new[] {new StyleProperty("foo", "honk!")})
            });

            // Set style sheet to null, property shouldn't exist.

            var uiMgr = IoCManager.Resolve<IUserInterfaceManager>();
            uiMgr.Stylesheet = null;

            var baseControl = new Control();
            baseControl.AddStyleClass("A");
            var childA = new Control();
            childA.AddStyleClass("A");
            var childB = new Control();
            childB.AddStyleClass("A");

            uiMgr.StateRoot.AddChild(baseControl);

            baseControl.AddChild(childA);
            childA.AddChild(childB);

            baseControl.ForceRunStyleUpdate();

            Assert.That(baseControl.TryGetStyleProperty("foo", out object? _), Is.False);

            uiMgr.RootControl.Stylesheet = sheetA;
            childA.Stylesheet = sheetB;

            // Assign sheets.
            baseControl.ForceRunStyleUpdate();

            baseControl.TryGetStyleProperty("foo", out object? value);
            Assert.That(value, Is.EqualTo("bar"));

            childA.TryGetStyleProperty("foo", out value);
            Assert.That(value, Is.EqualTo("honk!"));

            childB.TryGetStyleProperty("foo", out value);
            Assert.That(value, Is.EqualTo("honk!"));
        }
    }
}