// Copyright (c) The Perspex Project. All rights reserved.
// Licensed under the MIT license. See licence.md file in the project root for full license information.

using System.Reactive;
using System.Reactive.Subjects;
using Moq;
using Perspex.Controls.Presenters;
using Perspex.Controls.Templates;
using Perspex.Input;
using Perspex.Input.Raw;
using Perspex.Layout;
using Perspex.Platform;
using Perspex.Rendering;
using Perspex.Styling;
using Ploeh.AutoFixture;
using Ploeh.AutoFixture.AutoMoq;
using Xunit;

namespace Perspex.Controls.UnitTests
{
    public class TopLevelTests
    {
        [Fact]
        public void ClientSize_Should_Be_Set_On_Construction()
        {
            using (PerspexLocator.EnterScope())
            {
                RegisterServices();

                var impl = new Mock<ITopLevelImpl>();
                impl.Setup(x => x.ClientSize).Returns(new Size(123, 456));

                var target = new TestTopLevel(impl.Object);

                Assert.Equal(new Size(123, 456), target.ClientSize);
            }
        }

        [Fact]
        public void Width_Should_Not_Be_Set_On_Construction()
        {
            using (PerspexLocator.EnterScope())
            {
                RegisterServices();

                var impl = new Mock<ITopLevelImpl>();
                impl.Setup(x => x.ClientSize).Returns(new Size(123, 456));

                var target = new TestTopLevel(impl.Object);

                Assert.Equal(double.NaN, target.Width);
            }
        }

        [Fact]
        public void Height_Should_Not_Be_Set_On_Construction()
        {
            using (PerspexLocator.EnterScope())
            {
                RegisterServices();

                var impl = new Mock<ITopLevelImpl>();
                impl.Setup(x => x.ClientSize).Returns(new Size(123, 456));

                var target = new TestTopLevel(impl.Object);

                Assert.Equal(double.NaN, target.Height);
            }
        }

        [Fact]
        public void Layout_Pass_Should_Not_Be_Automatically_Scheduled()
        {
            using (PerspexLocator.EnterScope())
            {
                RegisterServices();

                var impl = new Mock<ITopLevelImpl>();
                var target = new TestTopLevel(impl.Object);

                // The layout pass should be scheduled by the derived class.
                var layoutManagerMock = Mock.Get(target.LayoutManager);
                layoutManagerMock.Verify(x => x.ExecuteLayoutPass(), Times.Never);
            }
        }

        [Fact]
        public void Bounds_Should_Be_Set_After_Layout_Pass()
        {
            using (PerspexLocator.EnterScope())
            {
                RegisterServices();
                PerspexLocator.CurrentMutable.Bind<ILayoutManager>().ToConstant(new LayoutManager());

                var impl = new Mock<ITopLevelImpl>();
                impl.SetupProperty(x => x.ClientSize);
                impl.SetupProperty(x => x.Resized);

                var target = new TestTopLevel(impl.Object)
                {
                    Template = new ControlTemplate<TestTopLevel>(x =>
                        new ContentPresenter
                        {
                            [~ContentPresenter.ContentProperty] = x[~ContentControl.ContentProperty],
                        }),
                    Content = new TextBlock
                    {
                        Width = 321,
                        Height = 432,
                    }
                };

                target.LayoutManager.ExecuteLayoutPass();

                Assert.Equal(new Rect(0, 0, 321, 432), target.Bounds);
            }
        }

        [Fact]
        public void Impl_ClientSize_Should_Be_Set_After_Layout_Pass()
        {
            using (PerspexLocator.EnterScope())
            {
                RegisterServices();
                PerspexLocator.CurrentMutable.Bind<ILayoutManager>().ToConstant(new LayoutManager());

                var impl = new Mock<ITopLevelImpl>();

                var target = new TestTopLevel(impl.Object)
                {
                    Template = new ControlTemplate<TestTopLevel>(x =>
                        new ContentPresenter
                        {
                            [~ContentPresenter.ContentProperty] = x[~ContentControl.ContentProperty],
                        }),
                    Content = new TextBlock
                    {
                        Width = 321,
                        Height = 432,
                    }
                };

                target.LayoutManager.ExecuteLayoutPass();

                impl.VerifySet(x => x.ClientSize = new Size(321, 432));
            }
        }

        [Fact]
        public void Width_And_Height_Should_Not_Be_Set_After_Layout_Pass()
        {
            using (PerspexLocator.EnterScope())
            {
                RegisterServices();

                var impl = new Mock<ITopLevelImpl>();
                impl.Setup(x => x.ClientSize).Returns(new Size(123, 456));

                var target = new TestTopLevel(impl.Object);
                target.LayoutManager.ExecuteLayoutPass();

                Assert.Equal(double.NaN, target.Width);
                Assert.Equal(double.NaN, target.Height);
            }
        }

        [Fact]
        public void Render_Should_Be_Scheduled_After_Layout_Pass()
        {
            using (PerspexLocator.EnterScope())
            {
                RegisterServices();
                var completed = new Subject<Unit>();
                var layoutManagerMock = Mock.Get(PerspexLocator.Current.GetService<ILayoutManager>());
                layoutManagerMock.Setup(x => x.LayoutCompleted).Returns(completed);

                var impl = new Mock<ITopLevelImpl>();
                impl.Setup(x => x.ClientSize).Returns(new Size(123, 456));

                var target = new TestTopLevel(impl.Object);
                completed.OnNext(Unit.Default);

                var renderManagerMock = Mock.Get(PerspexLocator.Current.GetService<IRenderQueueManager>());
                renderManagerMock.Verify(x => x.InvalidateRender(target));
            }
        }

        [Fact]
        public void Width_And_Height_Should_Be_Set_After_Window_Resize_Notification()
        {
            using (PerspexLocator.EnterScope())
            {
                RegisterServices();

                var impl = new Mock<ITopLevelImpl>();
                impl.SetupAllProperties();
                impl.Setup(x => x.ClientSize).Returns(new Size(123, 456));

                // The user has resized the window, so we can no longer auto-size.
                var target = new TestTopLevel(impl.Object);
                impl.Object.Resized(new Size(100, 200));

                Assert.Equal(100, target.Width);
                Assert.Equal(200, target.Height);
            }
        }

        [Fact]
        public void Activate_Should_Call_Impl_Activate()
        {
            using (PerspexLocator.EnterScope())
            {
                RegisterServices();

                var impl = new Mock<ITopLevelImpl>();
                var target = new TestTopLevel(impl.Object);

                target.Activate();

                impl.Verify(x => x.Activate());
            }
        }

        [Fact]
        public void Impl_Activate_Should_Call_Raise_Activated_Event()
        {
            using (PerspexLocator.EnterScope())
            {
                RegisterServices();

                var impl = new Mock<ITopLevelImpl>();
                impl.SetupAllProperties();

                bool raised = false;
                var target = new TestTopLevel(impl.Object);
                target.Activated += (s, e) => raised = true;

                impl.Object.Activated();

                Assert.True(raised);
            }
        }

        [Fact]
        public void Impl_Close_Should_Call_Raise_Closed_Event()
        {
            using (PerspexLocator.EnterScope())
            {
                RegisterServices();

                var impl = new Mock<ITopLevelImpl>();
                impl.SetupAllProperties();

                bool raised = false;
                var target = new TestTopLevel(impl.Object);
                target.Closed += (s, e) => raised = true;

                impl.Object.Closed();

                Assert.True(raised);
            }
        }

        [Fact]
        public void Impl_Deactivate_Should_Call_Raise_Activated_Event()
        {
            using (PerspexLocator.EnterScope())
            {
                RegisterServices();

                var impl = new Mock<ITopLevelImpl>();
                impl.SetupAllProperties();

                bool raised = false;
                var target = new TestTopLevel(impl.Object);
                target.Deactivated += (s, e) => raised = true;

                impl.Object.Deactivated();

                Assert.True(raised);
            }
        }

        [Fact]
        public void Impl_Input_Should_Pass_Input_To_InputManager()
        {
            using (PerspexLocator.EnterScope())
            {
                RegisterServices();

                var impl = new Mock<ITopLevelImpl>();
                impl.SetupAllProperties();
                var target = new TestTopLevel(impl.Object);

                var input = new RawKeyEventArgs(
                    new Mock<IKeyboardDevice>().Object,
                    0,
                    RawKeyEventType.KeyDown,
                    Key.A, InputModifiers.None);
                impl.Object.Input(input);

                var inputManagerMock = Mock.Get(InputManager.Instance);
                inputManagerMock.Verify(x => x.Process(input));
            }
        }

        private void RegisterServices()
        {
            var fixture = new Fixture().Customize(new AutoMoqCustomization());
            var l = PerspexLocator.CurrentMutable;

            var formattedText = fixture.Create<IFormattedTextImpl>();
            var globalStyles = new Mock<IGlobalStyles>();
            var layoutManager = fixture.Create<ILayoutManager>();
            var renderInterface = fixture.Create<IPlatformRenderInterface>();
            var renderManager = fixture.Create<IRenderQueueManager>();
            var windowImpl = new Mock<IWindowImpl>();
            var theme = new Styles();

            globalStyles.Setup(x => x.Styles).Returns(theme);


            PerspexLocator.CurrentMutable
                .Bind<IInputManager>().ToConstant(new Mock<IInputManager>().Object)
                .Bind<IFocusManager>().ToConstant(new Mock<IFocusManager>().Object)
                .Bind<IGlobalStyles>().ToConstant(globalStyles.Object)
                .Bind<ILayoutManager>().ToConstant(layoutManager)
                .Bind<IPlatformRenderInterface>().ToConstant(renderInterface)
                .Bind<IPlatformThreadingInterface>().ToConstant(new Mock<IPlatformThreadingInterface>().Object)
                .Bind<IRenderQueueManager>().ToConstant(renderManager)
                .Bind<IStyler>().ToConstant(new Styler());
        }

        private class TestTopLevel : TopLevel
        {
            public TestTopLevel(ITopLevelImpl impl)
                : base(impl)
            {
            }
        }
    }
}