using System.Text;
using System;
using Xunit;
using Xunit.Abstractions;
using Microsoft.VisualStudio.TestPlatform.Utilities;

namespace Terminal.Gui.ViewsTests; 

public class DrawTests {
	readonly ITestOutputHelper _output;

	public DrawTests (ITestOutputHelper output) => _output = output;

	[Fact] [AutoInitShutdown]
	public void Clipping_AddRune_Left_Or_Right_Replace_Previous_Or_Next_Wide_Rune_With_Space ()
	{
		var tv = new TextView () {
			Width = Dim.Fill (),
			Height = Dim.Fill (),
			Text = @"これは広いルーンラインです。
これは広いルーンラインです。
これは広いルーンラインです。
これは広いルーンラインです。
これは広いルーンラインです。
これは広いルーンラインです。
これは広いルーンラインです。
これは広いルーンラインです。"
		};
		var win = new Window () { Width = Dim.Fill (), Height = Dim.Fill () };
		win.Add (tv);
		Application.Top.Add (win);
		var lbl = new Label ("ワイドルーン。");
		// Don't have unit tests use things that aren't absolutely critical for the test, like Dialog
		var dg = new Window () { X = 2, Y = 2, Width = 14, Height = 3 };
		dg.Add (lbl);
		Application.Begin (Application.Top);
		Application.Begin (dg);
		((FakeDriver)Application.Driver).SetBufferSize (30, 10);

		string expected = @$"
┌────────────────────────────┐
│これは広いルーンラインです。│
│�┌────────────┐�ラインです。│
│�│ワイドルーン│�ラインです。│
│�└────────────┘�ラインです。│
│これは広いルーンラインです。│
│これは広いルーンラインです。│
│これは広いルーンラインです。│
│これは広いルーンラインです。│
└────────────────────────────┘";

		var pos = TestHelpers.AssertDriverContentsWithFrameAre (expected, _output);
		Assert.Equal (new Rect (0, 0, 30, 10), pos);
	}

	// TODO: The tests below that use Label should use View instead.
	[Fact] [AutoInitShutdown]
	public void Non_Bmp_ConsoleWidth_ColumnWidth_Equal_Two ()
	{
		string us = "\U0001d539";
		var r = (Rune)0x1d539;

		Assert.Equal ("𝔹", us);
		Assert.Equal ("𝔹", r.ToString ());
		Assert.Equal (us, r.ToString ());

		Assert.Equal (1, us.GetColumns ());
		Assert.Equal (1, r.GetColumns ());

		var win = new Window () { Title = us };
		var label = new Label (r.ToString ());
		var tf = new TextField (us) { Y = 1, Width = 3 };
		win.Add (label, tf);
		var top = Application.Top;
		top.Add (win);

		Application.Begin (top);
		((FakeDriver)Application.Driver).SetBufferSize (10, 4);

		string expected = @"
┌┤𝔹├─────┐
│𝔹       │
│𝔹       │
└────────┘";
		TestHelpers.AssertDriverContentsWithFrameAre (expected, _output);

		TestHelpers.AssertDriverContentsAre (expected, _output);

		var expectedColors = new Attribute [] {
			// 0
			Colors.Base.Normal,
			// 1
			Colors.Base.Focus,
			// 2
			Colors.Base.HotNormal
		};

		TestHelpers.AssertDriverColorsAre (@"
0020000000
0000000000
0111000000
0000000000", Application.Driver, expectedColors);
	}

	[Fact] [AutoInitShutdown]
	public void CJK_Compatibility_Ideographs_ConsoleWidth_ColumnWidth_Equal_Two ()
	{
		string us = "\U0000f900";
		var r = (Rune)0xf900;

		Assert.Equal ("豈", us);
		Assert.Equal ("豈", r.ToString ());
		Assert.Equal (us, r.ToString ());

		Assert.Equal (2, us.GetColumns ());
		Assert.Equal (2, r.GetColumns ());

		var win = new Window () { Title = us };
		var label = new Label (r.ToString ());
		var tf = new TextField (us) { Y = 1, Width = 3 };
		win.Add (label, tf);
		var top = Application.Top;
		top.Add (win);

		Application.Begin (top);
		((FakeDriver)Application.Driver).SetBufferSize (10, 4);

		string expected = @"
┌┤豈├────┐
│豈      │
│豈      │
└────────┘";
		TestHelpers.AssertDriverContentsWithFrameAre (expected, _output);

		TestHelpers.AssertDriverContentsAre (expected, _output);

		var expectedColors = new Attribute [] {
			// 0
			Colors.Base.Normal,
			// 1
			Colors.Base.Focus,
			// 2
			Colors.Base.HotNormal
		};

		TestHelpers.AssertDriverColorsAre (@"
0022000000
0000000000
0111000000
0000000000", Application.Driver, expectedColors);
	}

	[Fact] [AutoInitShutdown]
	public void Colors_On_TextAlignment_Right_And_Bottom ()
	{
		var labelRight = new Label ("Test") {
			Width = 6,
			Height = 1,
			TextAlignment = TextAlignment.Right,
			ColorScheme = Colors.Base
		};
		var labelBottom = new Label ("Test", TextDirection.TopBottom_LeftRight) {
			Y = 1,
			Width = 1,
			Height = 6,
			VerticalTextAlignment = VerticalTextAlignment.Bottom,
			ColorScheme = Colors.Base
		};
		var top = Application.Top;
		top.Add (labelRight, labelBottom);

		Application.Begin (top);
		((FakeDriver)Application.Driver).SetBufferSize (7, 7);

		TestHelpers.AssertDriverContentsWithFrameAre (@"
  Test
      
      
T     
e     
s     
t     ", _output);

		TestHelpers.AssertDriverColorsAre (@"
000000
0
0
0
0
0
0", Application.Driver, new Attribute [] { Colors.Base.Normal });
	}

	[Fact] [AutoInitShutdown]
	public void Draw_Negative_Bounds_Horizontal_Without_New_Lines ()
	{
		// BUGBUG: This previously assumed the default height of a View was 1. 
		var subView = new View () { Id = "subView", Y = 1, Width = 7, Height = 1, Text = "subView" };
		var view = new View () { Id = "view", Width = 20, Height = 2, Text = "01234567890123456789" };
		view.Add (subView);
		var content = new View () { Id = "content", Width = 20, Height = 20 };
		content.Add (view);
		var container = new View () { Id = "container", X = 1, Y = 1, Width = 5, Height = 5 };
		container.Add (content);
		var top = Application.Top;
		top.Add (container);
		// BUGBUG: v2 - it's bogus to reference .Frame before BeginInit. And why is the clip being set anyway???

		void Top_LayoutComplete (object sender, LayoutEventArgs e) => Application.Driver.Clip = container.Frame;
		top.LayoutComplete += Top_LayoutComplete;
		Application.Begin (top);

		TestHelpers.AssertDriverContentsWithFrameAre (@"
 01234
 subVi", _output);

		content.X = -1;
		Application.Refresh ();
		TestHelpers.AssertDriverContentsWithFrameAre (@"
 12345
 ubVie", _output);

		content.Y = -1;
		Application.Refresh ();
		TestHelpers.AssertDriverContentsWithFrameAre (@"
 ubVie", _output);

		content.Y = -2;
		Application.Refresh ();
		TestHelpers.AssertDriverContentsWithFrameAre ("", _output);

		content.X = -20;
		content.Y = 0;
		Application.Refresh ();
		TestHelpers.AssertDriverContentsWithFrameAre ("", _output);
	}

	[Fact] [AutoInitShutdown]
	public void Draw_Negative_Bounds_Horizontal_With_New_Lines ()
	{
		var subView = new View () { Id = "subView", X = 1, Width = 1, Height = 7, Text = "s\nu\nb\nV\ni\ne\nw" };
		var view = new View () { Id = "view", Width = 2, Height = 20, Text = "0\n1\n2\n3\n4\n5\n6\n7\n8\n9\n0\n1\n2\n3\n4\n5\n6\n7\n8\n9" };
		view.Add (subView);
		var content = new View () { Id = "content", Width = 20, Height = 20 };
		content.Add (view);
		var container = new View () { Id = "container", X = 1, Y = 1, Width = 5, Height = 5 };
		container.Add (content);
		var top = Application.Top;
		top.Add (container);
		Application.Driver.Clip = container.Frame;
		Application.Begin (top);

		TestHelpers.AssertDriverContentsWithFrameAre (@"
 0s
 1u
 2b
 3V
 4i", _output);

		content.X = -1;
		Application.Refresh ();
		TestHelpers.AssertDriverContentsWithFrameAre (@"
 s
 u
 b
 V
 i", _output);

		content.X = -2;
		Application.Refresh ();
		TestHelpers.AssertDriverContentsWithFrameAre (@"", _output);

		content.X = 0;
		content.Y = -1;
		Application.Refresh ();
		TestHelpers.AssertDriverContentsWithFrameAre (@"
 1u
 2b
 3V
 4i
 5e", _output);

		content.Y = -6;
		Application.Refresh ();
		TestHelpers.AssertDriverContentsWithFrameAre (@"
 6w
 7 
 8 
 9 
 0 ", _output);

		content.Y = -19;
		Application.Refresh ();
		TestHelpers.AssertDriverContentsWithFrameAre (@"
 9", _output);

		content.Y = -20;
		Application.Refresh ();
		TestHelpers.AssertDriverContentsWithFrameAre ("", _output);

		content.X = -2;
		content.Y = 0;
		Application.Refresh ();
		TestHelpers.AssertDriverContentsWithFrameAre ("", _output);
	}

	[Fact] [AutoInitShutdown]
	public void Draw_Negative_Bounds_Vertical ()
	{
		var subView = new View () { Id = "subView", X = 1, Width = 1, Height = 7, Text = "subView", TextDirection = TextDirection.TopBottom_LeftRight };
		var view = new View () { Id = "view", Width = 2, Height = 20, Text = "01234567890123456789", TextDirection = TextDirection.TopBottom_LeftRight };
		view.Add (subView);
		var content = new View () { Id = "content", Width = 20, Height = 20 };
		content.Add (view);
		var container = new View () { Id = "container", X = 1, Y = 1, Width = 5, Height = 5 };
		container.Add (content);
		var top = Application.Top;
		top.Add (container);
		Application.Driver.Clip = container.Frame;
		Application.Begin (top);

		TestHelpers.AssertDriverContentsWithFrameAre (@"
 0s
 1u
 2b
 3V
 4i", _output);

		content.X = -1;
		Application.Refresh ();
		TestHelpers.AssertDriverContentsWithFrameAre (@"
 s
 u
 b
 V
 i", _output);

		content.X = -2;
		Application.Refresh ();
		TestHelpers.AssertDriverContentsWithFrameAre (@"", _output);

		content.X = 0;
		content.Y = -1;
		Application.Refresh ();
		TestHelpers.AssertDriverContentsWithFrameAre (@"
 1u
 2b
 3V
 4i
 5e", _output);

		content.Y = -6;
		Application.Refresh ();
		TestHelpers.AssertDriverContentsWithFrameAre (@"
 6w
 7 
 8 
 9 
 0 ", _output);

		content.Y = -19;
		Application.Refresh ();
		TestHelpers.AssertDriverContentsWithFrameAre (@"
 9", _output);

		content.Y = -20;
		Application.Refresh ();
		TestHelpers.AssertDriverContentsWithFrameAre ("", _output);

		content.X = -2;
		content.Y = 0;
		Application.Refresh ();
		TestHelpers.AssertDriverContentsWithFrameAre ("", _output);
	}
}