using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Xunit;
using Xunit.Abstractions;

namespace Terminal.Gui.Views {
	public class CheckboxTests {
		readonly ITestOutputHelper output;

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

		[Fact]
		public void Constructors_Defaults ()
		{
			var ckb = new CheckBox ();
			Assert.False (ckb.Checked);
			Assert.Equal (string.Empty, ckb.Text);
			Assert.True (ckb.CanFocus);
			Assert.Equal (new Rect (0, 0, 4, 1), ckb.Frame);

			ckb = new CheckBox ("Test", true);
			Assert.True (ckb.Checked);
			Assert.Equal ("Test", ckb.Text);
			Assert.True (ckb.CanFocus);
			Assert.Equal (new Rect (0, 0, 8, 1), ckb.Frame);

			ckb = new CheckBox (1, 2, "Test");
			Assert.False (ckb.Checked);
			Assert.Equal ("Test", ckb.Text);
			Assert.True (ckb.CanFocus);
			Assert.Equal (new Rect (1, 2, 8, 1), ckb.Frame);

			ckb = new CheckBox (3, 4, "Test", true);
			Assert.True (ckb.Checked);
			Assert.Equal ("Test", ckb.Text);
			Assert.True (ckb.CanFocus);
			Assert.Equal (new Rect (3, 4, 8, 1), ckb.Frame);
		}

		[Fact]
		[AutoInitShutdown]
		public void KeyBindings_Command ()
		{
			var isChecked = false;
			CheckBox ckb = new CheckBox ("Test");
			ckb.Toggled += (e) => isChecked = true;
			Application.Top.Add (ckb);
			Application.Begin (Application.Top);

			Assert.Equal (Key.Null, ckb.HotKey);
			Assert.False (ckb.ProcessHotKey (new KeyEvent (Key.T, new KeyModifiers ())));
			Assert.False (isChecked);
			ckb.Text = "_Test";
			Assert.Equal (Key.T, ckb.HotKey);
			Assert.True (ckb.ProcessHotKey (new KeyEvent (Key.T | Key.AltMask, new KeyModifiers () { Alt = true })));
			Assert.True (isChecked);
			isChecked = false;
			Assert.True (ckb.ProcessKey (new KeyEvent ((Key)' ', new KeyModifiers ())));
			Assert.True (isChecked);
			isChecked = false;
			Assert.True (ckb.ProcessKey (new KeyEvent (Key.Space, new KeyModifiers ())));
			Assert.True (isChecked);
		}


		[Fact, AutoInitShutdown]
		public void AutoSize_StaysVisible ()
		{
			var checkBox = new CheckBox () {
				X = 1,
				Y = Pos.Center (),
				Text = "Check this out 你"
			};
			var win = new Window () {
				Width = Dim.Fill (),
				Height = Dim.Fill (),
				Title = "Test Demo 你"
			};
			win.Add (checkBox);
			Application.Top.Add (win);

			Assert.False (checkBox.IsInitialized);

			var runstate = Application.Begin (Application.Top);
			((FakeDriver)Application.Driver).SetBufferSize (30, 5);

			Assert.True (checkBox.IsInitialized);
			Assert.Equal ("Check this out 你", checkBox.Text);

			var expected = @"
┌ Test Demo 你 ──────────────┐
│                            │
│ ╴ Check this out 你        │
│                            │
└────────────────────────────┘
";

			// Positive test
			var pos = GraphViewTests.AssertDriverContentsWithFrameAre (expected, output);
			Assert.Equal (new Rect (0, 0, 30, 5), pos);

			// Negative test
			checkBox.AutoSize = true;
			bool first = false;
			Application.RunMainLoopIteration (ref runstate, true, ref first);

			GraphViewTests.AssertDriverContentsWithFrameAre (expected, output);
			Assert.Equal (new Rect (0, 0, 30, 5), pos);
		}
	}
}