gui-cs.Terminal.Gui/UnitTests/Application/Application.NavigationTests.cs

using Moq;
using Xunit.Abstractions;
using Terminal.Gui;

namespace Terminal.Gui.ApplicationTests.NavigationTests;

public class ApplicationNavigationTests (ITestOutputHelper output)
{
    private readonly ITestOutputHelper _output = output;

    [Fact]
    public void Focused_Change_Raises_FocusedChanged ()
    {
        bool raised = false;

        Application.Navigation = new ApplicationNavigation();

        Application.Navigation.FocusedChanged += ApplicationNavigationOnFocusedChanged;

        Application.Navigation.SetFocused(new View ());

        Assert.True (raised);

        Application.Navigation.GetFocused().Dispose ();
        Application.Navigation.SetFocused(null);

        Application.Navigation.FocusedChanged -= ApplicationNavigationOnFocusedChanged;

        Application.Navigation = null;

        return;

        void ApplicationNavigationOnFocusedChanged (object sender, EventArgs e)
        {
            raised = true;
        }
    }

    [Fact]
    public void GetDeepestFocusedSubview_ShouldReturnNull_WhenViewIsNull ()
    {
        // Act
        var result = ApplicationNavigation.GetDeepestFocusedSubview (null);

        // Assert
        Assert.Null (result);
    }

    [Fact]
    public void GetDeepestFocusedSubview_ShouldReturnSameView_WhenNoSubviewsHaveFocus ()
    {
        // Arrange
        var view = new View () { Id = "view", CanFocus = true }; ;

        // Act
        var result = ApplicationNavigation.GetDeepestFocusedSubview (view);

        // Assert
        Assert.Equal (view, result);
    }

    [Fact]
    public void GetDeepestFocusedSubview_ShouldReturnFocusedSubview ()
    {
        // Arrange
        var parentView = new View () { Id = "parentView", CanFocus = true }; ;
        var childView1 = new View () { Id = "childView1", CanFocus = true }; ;
        var childView2 = new View () { Id = "childView2", CanFocus = true }; ;
        var grandChildView = new View () { Id = "grandChildView", CanFocus = true }; ;

        parentView.Add (childView1, childView2);
        childView2.Add (grandChildView);

        grandChildView.SetFocus ();

        // Act
        var result = ApplicationNavigation.GetDeepestFocusedSubview (parentView);

        // Assert
        Assert.Equal (grandChildView, result);
    }

    [Fact]
    public void GetDeepestFocusedSubview_ShouldReturnDeepestFocusedSubview ()
    {
        // Arrange
        var parentView = new View () { Id = "parentView", CanFocus = true }; ;
        var childView1 = new View () { Id = "childView1", CanFocus = true }; ;
        var childView2 = new View () { Id = "childView2", CanFocus = true }; ;
        var grandChildView = new View () { Id = "grandChildView", CanFocus = true }; ;
        var greatGrandChildView = new View () { Id = "greatGrandChildView", CanFocus = true }; ;

        parentView.Add (childView1, childView2);
        childView2.Add (grandChildView);
        grandChildView.Add (greatGrandChildView);

        grandChildView.SetFocus ();

        // Act
        var result = ApplicationNavigation.GetDeepestFocusedSubview (parentView);

        // Assert
        Assert.Equal (greatGrandChildView, result);

        // Arrange
        greatGrandChildView.CanFocus = false;
        grandChildView.SetFocus ();

        // Act
        result = ApplicationNavigation.GetDeepestFocusedSubview (parentView);

        // Assert
        Assert.Equal (grandChildView, result);
    }


    //[Fact]
    //public void MoveNextViewOrTop_ShouldMoveFocusToNextViewOrTop ()
    //{
    //    // Arrange
    //    var top = new Toplevel ();
    //    var view1 = new View () { Id = "view1", CanFocus = true };
    //    var view2 = new View () { Id = "view2", CanFocus = true };
    //    top.Add (view1, view2);
    //    Application.Top = top;
    //    Application.Current = top;
    //    view1.SetFocus ();

    //    // Act
    //    ApplicationNavigation.MoveNextViewOrTop ();

    //    // Assert
    //    Assert.True (view2.HasFocus);

    //    top.Dispose ();
    //}



    //[Fact]
    //public void MovePreviousViewOrTop_ShouldMoveFocusToPreviousViewOrTop ()
    //{
    //    // Arrange
    //    var top = new Toplevel ();
    //    var view1 = new View () { Id = "view1", CanFocus = true, TabStop = TabBehavior.TabGroup };
    //    var view2 = new View () { Id = "view2", CanFocus = true, TabStop = TabBehavior.TabGroup };
    //    top.Add (view1, view2);
    //    Application.Top = top;
    //    Application.Current = top;
    //    view2.SetFocus ();

    //    // Act
    //    ApplicationNavigation.MovePreviousViewOrTop ();

    //    // Assert
    //    Assert.True (view1.HasFocus);

    //    top.Dispose ();
    //}
}