#nullable enable
using Moq;
using Terminal.Gui.App;

namespace ApplicationTests.Popover;

public class ApplicationPopoverTests
{
    [Fact]
    public void Register_AddsPopover ()
    {
        // Arrange
        var popover = new Mock<IPopover> ().Object;
        var popoverManager = new ApplicationPopover ();

        // Act
        popoverManager.Register (popover);

        // Assert
        Assert.Contains (popover, popoverManager.Popovers);
    }


    [Fact]
    public void DeRegister_RemovesPopover ()
    {
        // Arrange
        var popover = new Mock<IPopover> ().Object;
        var popoverManager = new ApplicationPopover ();
        popoverManager.Register (popover);

        // Act
        var result = popoverManager.DeRegister (popover);

        // Assert
        Assert.True (result);
        Assert.DoesNotContain (popover, popoverManager.Popovers);
    }

    [Fact]
    public void Show_SetsActivePopover ()
    {
        // Arrange
        var popover = new Mock<PopoverTestClass> ().Object;
        var popoverManager = new ApplicationPopover ();
        popoverManager.Register (popover);

        // Act
        popoverManager.Show (popover);

        // Assert
        Assert.Equal (popover, popoverManager.GetActivePopover ());
    }

    [Fact]
    public void Hide_ClearsActivePopover ()
    {
        // Arrange
        var popover = new Mock<IPopover> ().Object;
        var popoverManager = new ApplicationPopover ();
        popoverManager.Register (popover);
        popoverManager.Show (popover);

        // Act
        popoverManager.Hide (popover);

        // Assert
        Assert.Null (popoverManager.GetActivePopover ());
    }


    [Fact]
    public void DispatchKeyDown_ActivePopoverGetsKey ()
    {
        // Arrange
        var popover = new PopoverTestClass ();
        var popoverManager = new ApplicationPopover ();
        popoverManager.Register (popover);

        popoverManager.Show (popover);

        // Act
        popoverManager.DispatchKeyDown (Key.A);

        // Assert
        Assert.Contains (KeyCode.A, popover.HandledKeys);
    }


    [Fact]
    public void DispatchKeyDown_ActivePopoverGetsHotKey ()
    {
        // Arrange
        var popover = new PopoverTestClass ();
        var popoverManager = new ApplicationPopover ();
        popoverManager.Register (popover);
        popoverManager.Show (popover);

        // Act
        popoverManager.DispatchKeyDown (Key.N.WithCtrl);

        // Assert
        Assert.Equal (1, popover.NewCommandInvokeCount);
        Assert.Contains (Key.N.WithCtrl, popover.HandledKeys);
    }


    [Fact]
    public void DispatchKeyDown_InactivePopoverGetsHotKey ()
    {
        // Arrange
        var activePopover = new PopoverTestClass () { Id = "activePopover" };
        var inactivePopover = new PopoverTestClass () { Id = "inactivePopover" }; ;
        var popoverManager = new ApplicationPopover ();

        popoverManager.Register (activePopover);
        popoverManager.Show (activePopover);
        popoverManager.Register (inactivePopover);

        // Act
        popoverManager.DispatchKeyDown (Key.N.WithCtrl);

        // Assert
        Assert.Equal (1, activePopover.NewCommandInvokeCount);
        Assert.Equal (1, inactivePopover.NewCommandInvokeCount);
        Assert.Contains (Key.N.WithCtrl, activePopover.HandledKeys);
        Assert.NotEmpty (inactivePopover.HandledKeys);
    }

    [Fact]
    public void DispatchKeyDown_InactivePopoverDoesGetKey ()
    {
        // Arrange
        var activePopover = new PopoverTestClass ();
        var inactivePopover = new PopoverTestClass ();
        var popoverManager = new ApplicationPopover ();
        popoverManager.Register (activePopover);

        popoverManager.Show (activePopover);
        popoverManager.Register (inactivePopover);

        // Act
        popoverManager.DispatchKeyDown (Key.A);

        // Assert
        Assert.Contains (Key.A, activePopover.HandledKeys);
        Assert.NotEmpty (inactivePopover.HandledKeys);
    }

    public class PopoverTestClass : View, IPopover
    {
        public List<Key> HandledKeys { get; } = new List<Key> ();
        public int NewCommandInvokeCount { get; private set; }

        public PopoverTestClass ()
        {
            ViewportSettings = ViewportSettingsFlags.Transparent | ViewportSettingsFlags.TransparentMouse;
            CanFocus = true;
            AddCommand (Command.New, NewCommandHandler!);
            HotKeyBindings.Add (Key.N.WithCtrl, Command.New);

            AddCommand (Command.Quit, Quit);
            KeyBindings.Add (Application.QuitKey, Command.Quit);

            return;

            bool? Quit (ICommandContext? ctx)
            {
                if (!Visible)
                {
                    return false;
                }

                Visible = false;

                return true;
            }

            bool? NewCommandHandler (ICommandContext ctx)
            {
                NewCommandInvokeCount++;

                return false;
            }
        }

        protected override bool OnKeyDown (Key key)
        {
            HandledKeys.Add (key);
            return false;
        }

        /// <inheritdoc />
        public IRunnable? Current { get; set; }
    }
}