using System.Text;
using System;
using Xunit;
using Xunit.Abstractions;

namespace Terminal.Gui.ViewsTests {
	public class DrawTests {
		readonly ITestOutputHelper output;

		public DrawTests (ITestOutputHelper output)
		{
			this.output = output;
		}

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

			var 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", expectedColors);
		}

		[Fact, AutoInitShutdown]
		public void CJK_Compatibility_Ideographs_ConsoleWidth_ColumnWidth_Equal_Two ()
		{
			string us = "\U0000f900";
			Rune 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);

			var 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", 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", 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);
		}
	}
}