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

namespace Terminal.Gui.Views {
	public class ListViewTests {
		[Fact]
		public void Constructors_Defaults ()
		{
			var lv = new ListView ();
			Assert.Null (lv.Source);
			Assert.True (lv.CanFocus);

			lv = new ListView (new List<string> () { "One", "Two", "Three" });
			Assert.NotNull (lv.Source);

			lv = new ListView (new NewListDataSource());
			Assert.NotNull (lv.Source);

			lv = new ListView (new Rect (0, 1, 10, 20), new List<string> () { "One", "Two", "Three" });
			Assert.NotNull (lv.Source);
			Assert.Equal (new Rect (0, 1, 10, 20), lv.Frame);

			lv = new ListView (new Rect (0, 1, 10, 20), new NewListDataSource ());
			Assert.NotNull (lv.Source);
			Assert.Equal (new Rect (0, 1, 10, 20), lv.Frame);
		}

		private class NewListDataSource : IListDataSource {
			public int Count => throw new NotImplementedException ();

			public int Length => throw new NotImplementedException ();

			public bool IsMarked (int item)
			{
				throw new NotImplementedException ();
			}

			public void Render (ListView container, ConsoleDriver driver, bool selected, int item, int col, int line, int width, int start = 0)
			{
				throw new NotImplementedException ();
			}

			public void SetMark (int item, bool value)
			{
				throw new NotImplementedException ();
			}

			public IList ToList ()
			{
				throw new NotImplementedException ();
			}
		}

		[Fact]
		public void KeyBindings_Command ()
		{
			List<string> source = new List<string> () { "One", "Two", "Three" };
			ListView lv = new ListView (source) { Height = 2, AllowsMarking = true };
			Assert.Equal (0, lv.SelectedItem);
			Assert.True (lv.ProcessKey (new KeyEvent (Key.CursorDown, new KeyModifiers ())));
			Assert.Equal (1, lv.SelectedItem);
			Assert.True (lv.ProcessKey (new KeyEvent (Key.CursorUp, new KeyModifiers ())));
			Assert.Equal (0, lv.SelectedItem);
			Assert.True (lv.ProcessKey (new KeyEvent (Key.PageDown, new KeyModifiers ())));
			Assert.Equal (2, lv.SelectedItem);
			Assert.Equal (2, lv.TopItem);
			Assert.True (lv.ProcessKey (new KeyEvent (Key.PageUp, new KeyModifiers ())));
			Assert.Equal (0, lv.SelectedItem);
			Assert.Equal (0, lv.TopItem);
			Assert.False (lv.Source.IsMarked (lv.SelectedItem));
			Assert.True (lv.ProcessKey (new KeyEvent (Key.Space, new KeyModifiers ())));
			Assert.True (lv.Source.IsMarked (lv.SelectedItem));
			var opened = false;
			lv.OpenSelectedItem += (_) => opened = true;
			Assert.True (lv.ProcessKey (new KeyEvent (Key.Enter, new KeyModifiers ())));
			Assert.True (opened);
			Assert.True (lv.ProcessKey (new KeyEvent (Key.End, new KeyModifiers ())));
			Assert.Equal (2, lv.SelectedItem);
			Assert.True (lv.ProcessKey (new KeyEvent (Key.Home, new KeyModifiers ())));
			Assert.Equal (0, lv.SelectedItem);
		}
	}
}