gui-cs.Terminal.Gui/UnitTests/Views/Toplevel/OverlappedTests.cs

using System;
using Terminal.Gui;
using Xunit;
using Xunit.Abstractions;

namespace TerminalGui.ViewsTests;

public class OverlappedTests {
	readonly ITestOutputHelper _output;

	public OverlappedTests (ITestOutputHelper output)
	{
		_output = output;
#if DEBUG_IDISPOSABLE
		Responder.Instances.Clear ();
		RunState.Instances.Clear ();
#endif
	}

	[Fact]
	[TestRespondersDisposed]
	public void Dispose_Toplevel_IsOverlappedContainer_False_With_Begin_End ()
	{
		Application.Init (new FakeDriver ());

		var top = new Toplevel ();
		var rs = Application.Begin (top);
#if DEBUG_IDISPOSABLE
		Assert.Equal (4, Responder.Instances.Count);
#endif

		Application.End (rs);
		Application.Shutdown ();

#if DEBUG_IDISPOSABLE
		Assert.Empty (Responder.Instances);
#endif
	}

	[Fact]
	[TestRespondersDisposed]
	public void Dispose_Toplevel_IsOverlappedContainer_True_With_Begin ()
	{
		Application.Init (new FakeDriver ());

		var overlapped = new Toplevel { IsOverlappedContainer = true };
		var rs = Application.Begin (overlapped);
		Application.End (rs);

		Application.Shutdown ();
	}

	[Fact]
	[AutoInitShutdown]
	public void Application_RequestStop_With_Params_On_A_Not_OverlappedContainer_Always_Use_Application_Current ()
	{
		var top1 = new Toplevel ();
		var top2 = new Toplevel ();
		var top3 = new Window ();
		var top4 = new Window ();
		var d = new Dialog ();

		// top1, top2, top3, d1 = 4
		var iterations = 4;

		top1.Ready += (s, e) => {
			Assert.Null (Application.OverlappedChildren);
			Application.Run (top2);
		};
		top2.Ready += (s, e) => {
			Assert.Null (Application.OverlappedChildren);
			Application.Run (top3);
		};
		top3.Ready += (s, e) => {
			Assert.Null (Application.OverlappedChildren);
			Application.Run (top4);
		};
		top4.Ready += (s, e) => {
			Assert.Null (Application.OverlappedChildren);
			Application.Run (d);
		};

		d.Ready += (s, e) => {
			Assert.Null (Application.OverlappedChildren);
			// This will close the d because on a not OverlappedContainer the Application.Current it always used.
			Application.RequestStop (top1);
			Assert.True (Application.Current == d);
		};

		d.Closed += (s, e) => Application.RequestStop (top1);

		Application.Iteration += (s, a) => {
			Assert.Null (Application.OverlappedChildren);
			if (iterations == 4) {
				Assert.True (Application.Current == d);
			} else if (iterations == 3) {
				Assert.True (Application.Current == top4);
			} else if (iterations == 2) {
				Assert.True (Application.Current == top3);
			} else if (iterations == 1) {
				Assert.True (Application.Current == top2);
			} else {
				Assert.True (Application.Current == top1);
			}
			Application.RequestStop (top1);
			iterations--;
		};

		Application.Run (top1);

		Assert.Null (Application.OverlappedChildren);
	}

	[Fact]
	[AutoInitShutdown]
	public void OverlappedContainer_With_Toplevel_RequestStop_Balanced ()
	{
		var overlapped = new Overlapped ();
		var c1 = new Toplevel ();
		var c2 = new Window ();
		var c3 = new Window ();
		var d = new Dialog ();

		// OverlappedChild = c1, c2, c3
		// d1 = 1
		var iterations = 4;

		overlapped.Ready += (s, e) => {
			Assert.Empty (Application.OverlappedChildren);
			Application.Run (c1);
		};
		c1.Ready += (s, e) => {
			Assert.Single (Application.OverlappedChildren);
			Application.Run (c2);
		};
		c2.Ready += (s, e) => {
			Assert.Equal (2, Application.OverlappedChildren.Count);
			Application.Run (c3);
		};
		c3.Ready += (s, e) => {
			Assert.Equal (3, Application.OverlappedChildren.Count);
			Application.Run (d);
		};

		// More easy because the Overlapped Container handles all at once
		d.Ready += (s, e) => {
			Assert.Equal (3, Application.OverlappedChildren.Count);
			// This will not close the OverlappedContainer because d is a modal Toplevel and will be closed.
			overlapped.RequestStop ();
		};

		// Now this will close the OverlappedContainer propagating through the OverlappedChildren.
		d.Closed += (s, e) => {
			overlapped.RequestStop ();
		};

		Application.Iteration += (s, a) => {
			if (iterations == 4) {
				// The Dialog was not closed before and will be closed now.
				Assert.True (Application.Current == d);
				Assert.False (d.Running);
			} else {
				Assert.Equal (iterations, Application.OverlappedChildren.Count);
				for (var i = 0; i < iterations; i++) {
					Assert.Equal ((iterations - i + 1).ToString (), Application.OverlappedChildren [i].Id);
				}
			}
			iterations--;
		};

		Application.Run (overlapped);

		Assert.Empty (Application.OverlappedChildren);
	}

	[Fact]
	[AutoInitShutdown]
	public void OverlappedContainer_With_Application_RequestStop_OverlappedTop_With_Params ()
	{
		var overlapped = new Overlapped ();
		var c1 = new Toplevel ();
		var c2 = new Window ();
		var c3 = new Window ();
		var d = new Dialog ();

		// OverlappedChild = c1, c2, c3
		// d1 = 1
		var iterations = 4;

		overlapped.Ready += (s, e) => {
			Assert.Empty (Application.OverlappedChildren);
			Application.Run (c1);
		};
		c1.Ready += (s, e) => {
			Assert.Single (Application.OverlappedChildren);
			Application.Run (c2);
		};
		c2.Ready += (s, e) => {
			Assert.Equal (2, Application.OverlappedChildren.Count);
			Application.Run (c3);
		};
		c3.Ready += (s, e) => {
			Assert.Equal (3, Application.OverlappedChildren.Count);
			Application.Run (d);
		};

		// Also easy because the Overlapped Container handles all at once
		d.Ready += (s, e) => {
			Assert.Equal (3, Application.OverlappedChildren.Count);
			// This will not close the OverlappedContainer because d is a modal Toplevel
			Application.RequestStop (overlapped);
		};

		// Now this will close the OverlappedContainer propagating through the OverlappedChildren.
		d.Closed += (s, e) => Application.RequestStop (overlapped);

		Application.Iteration += (s, a) => {
			if (iterations == 4) {
				// The Dialog was not closed before and will be closed now.
				Assert.True (Application.Current == d);
				Assert.False (d.Running);
			} else {
				Assert.Equal (iterations, Application.OverlappedChildren.Count);
				for (var i = 0; i < iterations; i++) {
					Assert.Equal ((iterations - i + 1).ToString (), Application.OverlappedChildren [i].Id);
				}
			}
			iterations--;
		};

		Application.Run (overlapped);

		Assert.Empty (Application.OverlappedChildren);
	}

	[Fact]
	[AutoInitShutdown]
	public void OverlappedContainer_With_Application_RequestStop_OverlappedTop_Without_Params ()
	{
		var overlapped = new Overlapped ();
		var c1 = new Toplevel ();
		var c2 = new Window ();
		var c3 = new Window ();
		var d = new Dialog ();

		// OverlappedChild = c1, c2, c3 = 3
		// d1 = 1
		var iterations = 4;

		overlapped.Ready += (s, e) => {
			Assert.Empty (Application.OverlappedChildren);
			Application.Run (c1);
		};
		c1.Ready += (s, e) => {
			Assert.Single (Application.OverlappedChildren);
			Application.Run (c2);
		};
		c2.Ready += (s, e) => {
			Assert.Equal (2, Application.OverlappedChildren.Count);
			Application.Run (c3);
		};
		c3.Ready += (s, e) => {
			Assert.Equal (3, Application.OverlappedChildren.Count);
			Application.Run (d);
		};

		//More harder because it's sequential.
		d.Ready += (s, e) => {
			Assert.Equal (3, Application.OverlappedChildren.Count);
			// Close the Dialog
			Application.RequestStop ();
		};

		// Now this will close the OverlappedContainer propagating through the OverlappedChildren.
		d.Closed += (s, e) => Application.RequestStop (overlapped);

		Application.Iteration += (s, a) => {
			if (iterations == 4) {
				// The Dialog still is the current top and we can't request stop to OverlappedContainer
				// because we are not using parameter calls.
				Assert.True (Application.Current == d);
				Assert.False (d.Running);
			} else {
				Assert.Equal (iterations, Application.OverlappedChildren.Count);
				for (var i = 0; i < iterations; i++) {
					Assert.Equal ((iterations - i + 1).ToString (), Application.OverlappedChildren [i].Id);
				}
			}
			iterations--;
		};

		Application.Run (overlapped);

		Assert.Empty (Application.OverlappedChildren);
	}

	[Fact]
	[AutoInitShutdown]
	public void IsOverlappedChild_Testing ()
	{
		var overlapped = new Overlapped ();
		var c1 = new Toplevel ();
		var c2 = new Window ();
		var c3 = new Window ();
		var d = new Dialog ();

		Application.Iteration += (s, a) => {
			Assert.False (overlapped.IsOverlapped);
			Assert.True (c1.IsOverlapped);
			Assert.True (c2.IsOverlapped);
			Assert.True (c3.IsOverlapped);
			Assert.False (d.IsOverlapped);

			overlapped.RequestStop ();
		};

		Application.Run (overlapped);
	}

	[Fact]
	[AutoInitShutdown]
	public void Modal_Toplevel_Can_Open_Another_Modal_Toplevel_But_RequestStop_To_The_Caller_Also_Sets_Current_Running_To_False_Too ()
	{
		var overlapped = new Overlapped ();
		var c1 = new Toplevel ();
		var c2 = new Window ();
		var c3 = new Window ();
		var d1 = new Dialog ();
		var d2 = new Dialog ();

		// OverlappedChild = c1, c2, c3 = 3
		// d1, d2 = 2
		var iterations = 5;

		overlapped.Ready += (s, e) => {
			Assert.Empty (Application.OverlappedChildren);
			Application.Run (c1);
		};
		c1.Ready += (s, e) => {
			Assert.Single (Application.OverlappedChildren);
			Application.Run (c2);
		};
		c2.Ready += (s, e) => {
			Assert.Equal (2, Application.OverlappedChildren.Count);
			Application.Run (c3);
		};
		c3.Ready += (s, e) => {
			Assert.Equal (3, Application.OverlappedChildren.Count);
			Application.Run (d1);
		};
		d1.Ready += (s, e) => {
			Assert.Equal (3, Application.OverlappedChildren.Count);
			Application.Run (d2);
		};

		d2.Ready += (s, e) => {
			Assert.Equal (3, Application.OverlappedChildren.Count);
			Assert.True (Application.Current == d2);
			Assert.True (Application.Current.Running);
			// Trying to close the Dialog1
			d1.RequestStop ();
		};

		// Now this will close the OverlappedContainer propagating through the OverlappedChildren.
		d1.Closed += (s, e) => {
			Assert.True (Application.Current == d1);
			Assert.False (Application.Current.Running);
			overlapped.RequestStop ();
		};

		Application.Iteration += (s, a) => {
			if (iterations == 5) {
				// The Dialog2 still is the current top and we can't request stop to OverlappedContainer
				// because Dialog2 and Dialog1 must be closed first.
				// Dialog2 will be closed in this iteration.
				Assert.True (Application.Current == d2);
				Assert.False (Application.Current.Running);
				Assert.False (d1.Running);
			} else if (iterations == 4) {
				// Dialog1 will be closed in this iteration.
				Assert.True (Application.Current == d1);
				Assert.False (Application.Current.Running);
			} else {
				Assert.Equal (iterations, Application.OverlappedChildren.Count);
				for (var i = 0; i < iterations; i++) {
					Assert.Equal ((iterations - i + 1).ToString (), Application.OverlappedChildren [i].Id);
				}
			}
			iterations--;
		};

		Application.Run (overlapped);

		Assert.Empty (Application.OverlappedChildren);
	}

	[Fact]
	[AutoInitShutdown]
	public void Modal_Toplevel_Can_Open_Another_Not_Modal_Toplevel_But_RequestStop_To_The_Caller_Also_Sets_Current_Running_To_False_Too ()
	{
		var overlapped = new Overlapped ();
		var c1 = new Toplevel ();
		var c2 = new Window ();
		var c3 = new Window ();
		var d1 = new Dialog ();
		var c4 = new Toplevel ();

		// OverlappedChild = c1, c2, c3, c4 = 4
		// d1 = 1
		var iterations = 5;

		overlapped.Ready += (s, e) => {
			Assert.Empty (Application.OverlappedChildren);
			Application.Run (c1);
		};
		c1.Ready += (s, e) => {
			Assert.Single (Application.OverlappedChildren);
			Application.Run (c2);
		};
		c2.Ready += (s, e) => {
			Assert.Equal (2, Application.OverlappedChildren.Count);
			Application.Run (c3);
		};
		c3.Ready += (s, e) => {
			Assert.Equal (3, Application.OverlappedChildren.Count);
			Application.Run (d1);
		};
		d1.Ready += (s, e) => {
			Assert.Equal (3, Application.OverlappedChildren.Count);
			Application.Run (c4);
		};

		c4.Ready += (s, e) => {
			Assert.Equal (4, Application.OverlappedChildren.Count);
			// Trying to close the Dialog1
			d1.RequestStop ();
		};

		// Now this will close the OverlappedContainer propagating through the OverlappedChildren.
		d1.Closed += (s, e) => {
			overlapped.RequestStop ();
		};

		Application.Iteration += (s, a) => {
			if (iterations == 5) {
				// The Dialog2 still is the current top and we can't request stop to OverlappedContainer
				// because Dialog2 and Dialog1 must be closed first.
				// Using request stop here will call the Dialog again without need
				Assert.True (Application.Current == d1);
				Assert.False (Application.Current.Running);
				Assert.True (c4.Running);
			} else {
				Assert.Equal (iterations, Application.OverlappedChildren.Count);
				for (var i = 0; i < iterations; i++) {
					Assert.Equal ((iterations - i + (iterations == 4 && i == 0 ? 2 : 1)).ToString (),
						Application.OverlappedChildren [i].Id);
				}
			}
			iterations--;
		};

		Application.Run (overlapped);

		Assert.Empty (Application.OverlappedChildren);
	}

	[Fact]
	[AutoInitShutdown]
	public void MoveCurrent_Returns_False_If_The_Current_And_Top_Parameter_Are_Both_With_Running_Set_To_False ()
	{
		var overlapped = new Overlapped ();
		var c1 = new Toplevel ();
		var c2 = new Window ();
		var c3 = new Window ();

		// OverlappedChild = c1, c2, c3
		var iterations = 3;

		overlapped.Ready += (s, e) => {
			Assert.Empty (Application.OverlappedChildren);
			Application.Run (c1);
		};
		c1.Ready += (s, e) => {
			Assert.Single (Application.OverlappedChildren);
			Application.Run (c2);
		};
		c2.Ready += (s, e) => {
			Assert.Equal (2, Application.OverlappedChildren.Count);
			Application.Run (c3);
		};
		c3.Ready += (s, e) => {
			Assert.Equal (3, Application.OverlappedChildren.Count);
			c3.RequestStop ();
			c1.RequestStop ();
		};
		// Now this will close the OverlappedContainer propagating through the OverlappedChildren.
		c1.Closed += (s, e) => {
			overlapped.RequestStop ();
		};
		Application.Iteration += (s, a) => {
			if (iterations == 3) {
				// The Current still is c3 because Current.Running is false.
				Assert.True (Application.Current == c3);
				Assert.False (Application.Current.Running);
				// But the Children order were reorder by Running = false
				Assert.True (Application.OverlappedChildren [0] == c3);
				Assert.True (Application.OverlappedChildren [1] == c1);
				Assert.True (Application.OverlappedChildren [^1] == c2);
			} else if (iterations == 2) {
				// The Current is c1 and Current.Running is false.
				Assert.True (Application.Current == c1);
				Assert.False (Application.Current.Running);
				Assert.True (Application.OverlappedChildren [0] == c1);
				Assert.True (Application.OverlappedChildren [^1] == c2);
			} else if (iterations == 1) {
				// The Current is c2 and Current.Running is false.
				Assert.True (Application.Current == c2);
				Assert.False (Application.Current.Running);
				Assert.True (Application.OverlappedChildren [^1] == c2);
			} else {
				// The Current is overlapped.
				Assert.True (Application.Current == overlapped);
				Assert.Empty (Application.OverlappedChildren);
			}
			iterations--;
		};

		Application.Run (overlapped);

		Assert.Empty (Application.OverlappedChildren);
	}

	[Fact]
	[AutoInitShutdown]
	public void OverlappedContainer_Throws_If_More_Than_One ()
	{
		var overlapped = new Overlapped ();
		var overlapped2 = new Overlapped ();

		overlapped.Ready += (s, e) => {
			Assert.Throws<InvalidOperationException> (() => Application.Run (overlapped2));
			overlapped.RequestStop ();
		};

		Application.Run (overlapped);
	}

	[Fact]
	[AutoInitShutdown]
	public void OverlappedContainer_Open_And_Close_Modal_And_Open_Not_Modal_Toplevels_Randomly ()
	{
		var overlapped = new Overlapped ();
		var logger = new Toplevel ();

		var iterations = 1; // The logger
		var running = true;
		var stageCompleted = true;
		var allStageClosed = false;
		var overlappedRequestStop = false;

		overlapped.Ready += (s, e) => {
			Assert.Empty (Application.OverlappedChildren);
			Application.Run (logger);
		};

		logger.Ready += (s, e) => Assert.Single (Application.OverlappedChildren);

		Application.Iteration += (s, a) => {
			if (stageCompleted && running) {
				stageCompleted = false;
				var stage = new Window { Modal = true };

				stage.Ready += (s, e) => {
					Assert.Equal (iterations, Application.OverlappedChildren.Count);
					stage.RequestStop ();
				};

				stage.Closed += (_, _) => {
					if (iterations == 11) {
						allStageClosed = true;
					}
					Assert.Equal (iterations, Application.OverlappedChildren.Count);
					if (running) {
						stageCompleted = true;

						var rpt = new Window ();

						rpt.Ready += (s, e) => {
							iterations++;
							Assert.Equal (iterations, Application.OverlappedChildren.Count);
						};

						Application.Run (rpt);
					}
				};

				Application.Run (stage);

			} else if (iterations == 11 && running) {
				running = false;
				Assert.Equal (iterations, Application.OverlappedChildren.Count);

			} else if (!overlappedRequestStop && running && !allStageClosed) {
				Assert.Equal (iterations, Application.OverlappedChildren.Count);
			} else if (!overlappedRequestStop && !running && allStageClosed) {
				Assert.Equal (iterations, Application.OverlappedChildren.Count);
				overlappedRequestStop = true;
				overlapped.RequestStop ();
			} else {
				Assert.Empty (Application.OverlappedChildren);
			}
		};

		Application.Run (overlapped);

		Assert.Empty (Application.OverlappedChildren);
	}

	[Fact]
	[AutoInitShutdown]
	public void AllChildClosed_Event_Test ()
	{
		var overlapped = new Overlapped ();
		var c1 = new Toplevel ();
		var c2 = new Window ();
		var c3 = new Window ();

		// OverlappedChild = c1, c2, c3
		var iterations = 3;

		overlapped.Ready += (s, e) => {
			Assert.Empty (Application.OverlappedChildren);
			Application.Run (c1);
		};
		c1.Ready += (s, e) => {
			Assert.Single (Application.OverlappedChildren);
			Application.Run (c2);
		};
		c2.Ready += (s, e) => {
			Assert.Equal (2, Application.OverlappedChildren.Count);
			Application.Run (c3);
		};
		c3.Ready += (s, e) => {
			Assert.Equal (3, Application.OverlappedChildren.Count);
			c3.RequestStop ();
			c2.RequestStop ();
			c1.RequestStop ();
		};
		// Now this will close the OverlappedContainer when all OverlappedChildren was closed
		overlapped.AllChildClosed += (s, e) => {
			overlapped.RequestStop ();
		};
		Application.Iteration += (s, a) => {
			if (iterations == 3) {
				// The Current still is c3 because Current.Running is false.
				Assert.True (Application.Current == c3);
				Assert.False (Application.Current.Running);
				// But the Children order were reorder by Running = false
				Assert.True (Application.OverlappedChildren [0] == c3);
				Assert.True (Application.OverlappedChildren [1] == c2);
				Assert.True (Application.OverlappedChildren [^1] == c1);
			} else if (iterations == 2) {
				// The Current is c2 and Current.Running is false.
				Assert.True (Application.Current == c2);
				Assert.False (Application.Current.Running);
				Assert.True (Application.OverlappedChildren [0] == c2);
				Assert.True (Application.OverlappedChildren [^1] == c1);
			} else if (iterations == 1) {
				// The Current is c1 and Current.Running is false.
				Assert.True (Application.Current == c1);
				Assert.False (Application.Current.Running);
				Assert.True (Application.OverlappedChildren [^1] == c1);
			} else {
				// The Current is overlapped.
				Assert.True (Application.Current == overlapped);
				Assert.False (Application.Current.Running);
				Assert.Empty (Application.OverlappedChildren);
			}
			iterations--;
		};

		Application.Run (overlapped);

		Assert.Empty (Application.OverlappedChildren);
	}

	[Fact]
	public void MoveToOverlappedChild_Throw_NullReferenceException_Passing_Null_Parameter () => Assert.Throws<NullReferenceException> (delegate { Application.MoveToOverlappedChild (null); });

	[Fact]
	[AutoInitShutdown]
	public void Visible_False_Does_Not_Clear ()
	{
		var overlapped = new Overlapped ();
		var win1 = new Window { Width = 5, Height = 5, Visible = false };
		var win2 = new Window { X = 1, Y = 1, Width = 5, Height = 5 };
		((FakeDriver)Application.Driver).SetBufferSize (10, 10);
		var rs = Application.Begin (overlapped);
		Application.Begin (win1);
		Application.Begin (win2);
		Assert.Equal (win2, Application.Current);
		var firstIteration = false;
		Application.RunIteration (ref rs, ref firstIteration);
		TestHelpers.AssertDriverContentsWithFrameAre (@"
 ┌───┐
 │   │
 │   │
 │   │
 └───┘", _output);
		var attributes = new [] {
			// 0
			Colors.TopLevel.Normal,
			// 1
			Colors.Base.Normal
		};
		TestHelpers.AssertDriverColorsAre (@"
0000000000
0111110000
0111110000
0111110000
0111110000
0111110000
0000000000
0000000000
0000000000
0000000000", null, attributes);

		Application.OnMouseEvent (new MouseEventEventArgs (new MouseEvent { X = 1, Y = 1, Flags = MouseFlags.Button1Pressed }));
		Assert.Equal (win2, Application.MouseGrabView);
		Application.OnMouseEvent (new MouseEventEventArgs (new MouseEvent { X = 2, Y = 2, Flags = MouseFlags.Button1Pressed | MouseFlags.ReportMousePosition }));
		// Need to fool MainLoop into thinking it's running
		Application.MainLoop.Running = true;
		Application.RunIteration (ref rs, ref firstIteration);
		TestHelpers.AssertDriverContentsWithFrameAre (@"
  ┌───┐
  │   │
  │   │
  │   │
  └───┘", _output);
		TestHelpers.AssertDriverColorsAre (@"
0000000000
0000000000
0011111000
0011111000
0011111000
0011111000
0011111000
0000000000
0000000000
0000000000", null, attributes);

		Application.Shutdown ();
	}

	class Overlapped : Toplevel {
		public Overlapped () => IsOverlappedContainer = true;
	}
}