using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using Terminal.Gui;
using Xunit;
using Xunit.Abstractions;

namespace UICatalog.Tests; 

public class ScenarioTests {
	readonly ITestOutputHelper _output;

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

	int CreateInput (string input)
	{
		FakeConsole.MockKeyPresses.Clear ();
		// Put a QuitKey in at the end
		FakeConsole.PushMockKeyPress ((KeyCode)Application.QuitKey);
		foreach (var c in input.Reverse ()) {
			var key = KeyCode.Null;
			if (char.IsLetter (c)) {
				key = (KeyCode)char.ToUpper (c) | (char.IsUpper (c) ? KeyCode.ShiftMask : 0);
			} else {
				key = (KeyCode)c;
			}
			FakeConsole.PushMockKeyPress (key);
		}
		return FakeConsole.MockKeyPresses.Count;
	}

	/// <summary>
	///         <para>
	///         This runs through all Scenarios defined in UI Catalog, calling Init, Setup, and Run.
	///         </para>
	///         <para>
	///         Should find any Scenarios which crash on load or do not respond to <see cref="Application.RequestStop()"/>.
	///         </para>
	/// </summary>
	[Fact]
	public void Run_All_Scenarios ()
	{
		var scenarios = Scenario.GetScenarios ();
		Assert.NotEmpty (scenarios);

		foreach (var scenario in scenarios) {
			_output.WriteLine ($"Running Scenario '{scenario.GetName ()}'");

			Application.Init (new FakeDriver ());

			// Press QuitKey 
			Assert.Empty (FakeConsole.MockKeyPresses);
			// BUGBUG: (#2474) For some reason ReadKey is not returning the QuitKey for some Scenarios
			// by adding this Space it seems to work.
			//FakeConsole.PushMockKeyPress (Key.Space);
			FakeConsole.PushMockKeyPress ((KeyCode)Application.QuitKey);

			// The only key we care about is the QuitKey
			Application.Top.KeyDown += (sender, args) => {
				_output.WriteLine ($"  Keypress: {args.KeyCode}");
				// BUGBUG: (#2474) For some reason ReadKey is not returning the QuitKey for some Scenarios
				// by adding this Space it seems to work.
				// See #2474 for why this is commented out
				Assert.Equal (Application.QuitKey.KeyCode, args.KeyCode);
			};

			uint abortTime = 500;
			// If the scenario doesn't close within 500ms, this will force it to quit
			var forceCloseCallback = () => {
				if (Application.Top.Running && FakeConsole.MockKeyPresses.Count == 0) {
					Application.RequestStop ();
					// See #2474 for why this is commented out
					Assert.Fail ($"'{scenario.GetName ()}' failed to Quit with {Application.QuitKey} after {abortTime}ms. Force quit.");
				}
				return false;
			};
			//output.WriteLine ($"  Add timeout to force quit after {abortTime}ms");
			_ = Application.AddTimeout (TimeSpan.FromMilliseconds (abortTime), forceCloseCallback);

			Application.Iteration += (s, a) => {
				//output.WriteLine ($"  iteration {++iterations}");
				if (Application.Top.Running && FakeConsole.MockKeyPresses.Count == 0) {
					Application.RequestStop ();
					Assert.Fail ($"'{scenario.GetName ()}' failed to Quit with {Application.QuitKey}. Force quit.");
				}
			};

			scenario.Init ();
			scenario.Setup ();
			scenario.Run ();
			scenario.Dispose ();

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

	[Fact]
	public void Run_Generic ()
	{
		var scenarios = Scenario.GetScenarios ();
		Assert.NotEmpty (scenarios);

		var item = scenarios.FindIndex (s => s.GetName ().Equals ("Generic", StringComparison.OrdinalIgnoreCase));
		var generic = scenarios [item];

		Application.Init (new FakeDriver ());
		// BUGBUG: (#2474) For some reason ReadKey is not returning the QuitKey for some Scenarios
		// by adding this Space it seems to work.

		FakeConsole.PushMockKeyPress ((KeyCode)Application.QuitKey);

		var ms = 100;
		var abortCount = 0;
		var abortCallback = () => {
			abortCount++;
			_output.WriteLine ($"'Generic' abortCount {abortCount}");
			Application.RequestStop ();
			return false;
		};

		var iterations = 0;
		object token = null;
		Application.Iteration += (s, a) => {
			if (token == null) {
				// Timeout only must start at first iteration
				token = Application.MainLoop.AddTimeout (TimeSpan.FromMilliseconds (ms), abortCallback);
			}
			iterations++;
			_output.WriteLine ($"'Generic' iteration {iterations}");
			// Stop if we run out of control...
			if (iterations == 10) {
				_output.WriteLine ("'Generic' had to be force quit!");
				Application.RequestStop ();
			}
		};

		Application.Top.KeyDown += (sender, args) => {
			// See #2474 for why this is commented out
			Assert.Equal (KeyCode.CtrlMask | KeyCode.Q, args.KeyCode);
		};

		generic.Init ();
		generic.Setup ();
		generic.Run ();

		Assert.Equal (0, abortCount);
		// # of key up events should match # of iterations
		Assert.Equal (1, iterations);

		generic.Dispose ();

		// Shutdown must be called to safely clean up Application if Init has been called
		Application.Shutdown ();

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

	[Fact]
	public void Run_All_Views_Tester_Scenario ()
	{
		Window _leftPane;
		ListView _classListView;
		FrameView _hostPane;

		Dictionary<string, Type> _viewClasses;
		View _curView = null;

		// Settings
		FrameView _settingsPane;
		CheckBox _computedCheckBox;
		FrameView _locationFrame;
		RadioGroup _xRadioGroup;
		TextField _xText;
		var _xVal = 0;
		RadioGroup _yRadioGroup;
		TextField _yText;
		var _yVal = 0;

		FrameView _sizeFrame;
		RadioGroup _wRadioGroup;
		TextField _wText;
		var _wVal = 0;
		RadioGroup _hRadioGroup;
		TextField _hText;
		var _hVal = 0;
		var posNames = new List<String> { "Factor", "AnchorEnd", "Center", "Absolute" };
		var dimNames = new List<String> { "Factor", "Fill", "Absolute" };

		Application.Init (new FakeDriver ());

		var Top = Application.Top;

		_viewClasses = GetAllViewClassesCollection ()
			.OrderBy (t => t.Name)
			.Select (t => new KeyValuePair<string, Type> (t.Name, t))
			.ToDictionary (t => t.Key, t => t.Value);

		_leftPane = new Window {
			Title = "Classes",
			X = 0,
			Y = 0,
			Width = 15,
			Height = Dim.Fill (1), // for status bar
			CanFocus = false,
			ColorScheme = Colors.TopLevel
		};

		_classListView = new ListView (_viewClasses.Keys.ToList ()) {
			X = 0,
			Y = 0,
			Width = Dim.Fill (),
			Height = Dim.Fill (),
			AllowsMarking = false,
			ColorScheme = Colors.TopLevel
		};
		_leftPane.Add (_classListView);

		_settingsPane = new FrameView ("Settings") {
			X = Pos.Right (_leftPane),
			Y = 0, // for menu
			Width = Dim.Fill (),
			Height = 10,
			CanFocus = false,
			ColorScheme = Colors.TopLevel
		};
		_computedCheckBox = new CheckBox ("Computed Layout", true) { X = 0, Y = 0 };
		_settingsPane.Add (_computedCheckBox);

		var radioItems = new [] { "Percent(x)", "AnchorEnd(x)", "Center", "At(x)" };
		_locationFrame = new FrameView ("Location (Pos)") {
			X = Pos.Left (_computedCheckBox),
			Y = Pos.Bottom (_computedCheckBox),
			Height = 3 + radioItems.Length,
			Width = 36
		};
		_settingsPane.Add (_locationFrame);

		var label = new Label ("x:") { X = 0, Y = 0 };
		_locationFrame.Add (label);
		_xRadioGroup = new RadioGroup (radioItems) {
			X = 0,
			Y = Pos.Bottom (label)
		};
		_xText = new TextField ($"{_xVal}") { X = Pos.Right (label) + 1, Y = 0, Width = 4 };
		_locationFrame.Add (_xText);

		_locationFrame.Add (_xRadioGroup);

		radioItems = new [] { "Percent(y)", "AnchorEnd(y)", "Center", "At(y)" };
		label = new Label ("y:") { X = Pos.Right (_xRadioGroup) + 1, Y = 0 };
		_locationFrame.Add (label);
		_yText = new TextField ($"{_yVal}") { X = Pos.Right (label) + 1, Y = 0, Width = 4 };
		_locationFrame.Add (_yText);
		_yRadioGroup = new RadioGroup (radioItems) {
			X = Pos.X (label),
			Y = Pos.Bottom (label)
		};
		_locationFrame.Add (_yRadioGroup);

		_sizeFrame = new FrameView ("Size (Dim)") {
			X = Pos.Right (_locationFrame),
			Y = Pos.Y (_locationFrame),
			Height = 3 + radioItems.Length,
			Width = 40
		};

		radioItems = new [] { "Percent(width)", "Fill(width)", "Sized(width)" };
		label = new Label ("width:") { X = 0, Y = 0 };
		_sizeFrame.Add (label);
		_wRadioGroup = new RadioGroup (radioItems) {
			X = 0,
			Y = Pos.Bottom (label)
		};
		_wText = new TextField ($"{_wVal}") { X = Pos.Right (label) + 1, Y = 0, Width = 4 };
		_sizeFrame.Add (_wText);
		_sizeFrame.Add (_wRadioGroup);

		radioItems = new [] { "Percent(height)", "Fill(height)", "Sized(height)" };
		label = new Label ("height:") { X = Pos.Right (_wRadioGroup) + 1, Y = 0 };
		_sizeFrame.Add (label);
		_hText = new TextField ($"{_hVal}") { X = Pos.Right (label) + 1, Y = 0, Width = 4 };
		_sizeFrame.Add (_hText);

		_hRadioGroup = new RadioGroup (radioItems) {
			X = Pos.X (label),
			Y = Pos.Bottom (label)
		};
		_sizeFrame.Add (_hRadioGroup);

		_settingsPane.Add (_sizeFrame);

		_hostPane = new FrameView ("") {
			X = Pos.Right (_leftPane),
			Y = Pos.Bottom (_settingsPane),
			Width = Dim.Fill (),
			Height = Dim.Fill (1), // + 1 for status bar
			ColorScheme = Colors.Dialog
		};

		_classListView.OpenSelectedItem += (s, a) => {
			_settingsPane.SetFocus ();
		};
		_classListView.SelectedItemChanged += (s, args) => {
			// Remove existing class, if any
			if (_curView != null) {
				_curView.LayoutComplete -= LayoutCompleteHandler;
				_hostPane.Remove (_curView);
				_curView.Dispose ();
				_curView = null;
				_hostPane.Clear ();
			}
			_curView = CreateClass (_viewClasses.Values.ToArray () [_classListView.SelectedItem]);
		};

		_computedCheckBox.Toggled += (s, e) => {
			if (_curView != null) {
				//_curView.LayoutStyle = e.OldValue == true ? LayoutStyle.Absolute : LayoutStyle.Computed;
				_hostPane.LayoutSubviews ();
			}
		};

		_xRadioGroup.SelectedItemChanged += (s, selected) => DimPosChanged (_curView);

		_xText.TextChanged += (s, args) => {
			try {
				_xVal = int.Parse (_xText.Text);
				DimPosChanged (_curView);
			} catch { }
		};

		_yText.TextChanged += (s, e) => {
			try {
				_yVal = int.Parse (_yText.Text);
				DimPosChanged (_curView);
			} catch { }
		};

		_yRadioGroup.SelectedItemChanged += (s, selected) => DimPosChanged (_curView);

		_wRadioGroup.SelectedItemChanged += (s, selected) => DimPosChanged (_curView);

		_wText.TextChanged += (s, args) => {
			try {
				_wVal = int.Parse (_wText.Text);
				DimPosChanged (_curView);
			} catch { }
		};

		_hText.TextChanged += (s, args) => {
			try {
				_hVal = int.Parse (_hText.Text);
				DimPosChanged (_curView);
			} catch { }
		};

		_hRadioGroup.SelectedItemChanged += (s, selected) => DimPosChanged (_curView);

		Top.Add (_leftPane, _settingsPane, _hostPane);

		Top.LayoutSubviews ();

		_curView = CreateClass (_viewClasses.First ().Value);

		var iterations = 0;

		Application.Iteration += (s, a) => {
			iterations++;

			if (iterations < _viewClasses.Count) {
				_classListView.MoveDown ();
				Assert.Equal (_curView.GetType ().Name,
					_viewClasses.Values.ToArray () [_classListView.SelectedItem].Name);
			} else {
				Application.RequestStop ();
			}
		};

		Application.Run ();

		Assert.Equal (_viewClasses.Count, iterations);

		Application.Shutdown ();

		void DimPosChanged (View view)
		{
			if (view == null) {
				return;
			}

			var layout = view.LayoutStyle;

			try {
				//view.LayoutStyle = LayoutStyle.Absolute;

				switch (_xRadioGroup.SelectedItem) {
				case 0:
					view.X = Pos.Percent (_xVal);
					break;
				case 1:
					view.X = Pos.AnchorEnd (_xVal);
					break;
				case 2:
					view.X = Pos.Center ();
					break;
				case 3:
					view.X = Pos.At (_xVal);
					break;
				}

				switch (_yRadioGroup.SelectedItem) {
				case 0:
					view.Y = Pos.Percent (_yVal);
					break;
				case 1:
					view.Y = Pos.AnchorEnd (_yVal);
					break;
				case 2:
					view.Y = Pos.Center ();
					break;
				case 3:
					view.Y = Pos.At (_yVal);
					break;
				}

				switch (_wRadioGroup.SelectedItem) {
				case 0:
					view.Width = Dim.Percent (_wVal);
					break;
				case 1:
					view.Width = Dim.Fill (_wVal);
					break;
				case 2:
					view.Width = Dim.Sized (_wVal);
					break;
				}

				switch (_hRadioGroup.SelectedItem) {
				case 0:
					view.Height = Dim.Percent (_hVal);
					break;
				case 1:
					view.Height = Dim.Fill (_hVal);
					break;
				case 2:
					view.Height = Dim.Sized (_hVal);
					break;
				}
			} catch (Exception e) {
				MessageBox.ErrorQuery ("Exception", e.Message, "Ok");
			}
			UpdateTitle (view);
		}

		void UpdateSettings (View view)
		{
			var x = view.X.ToString ();
			var y = view.Y.ToString ();
			_xRadioGroup.SelectedItem = posNames.IndexOf (posNames.Where (s => x.Contains (s)).First ());
			_yRadioGroup.SelectedItem = posNames.IndexOf (posNames.Where (s => y.Contains (s)).First ());
			_xText.Text = $"{view.Frame.X}";
			_yText.Text = $"{view.Frame.Y}";

			var w = view.Width.ToString ();
			var h = view.Height.ToString ();
			_wRadioGroup.SelectedItem = dimNames.IndexOf (dimNames.Where (s => w.Contains (s)).First ());
			_hRadioGroup.SelectedItem = dimNames.IndexOf (dimNames.Where (s => h.Contains (s)).First ());
			_wText.Text = $"{view.Frame.Width}";
			_hText.Text = $"{view.Frame.Height}";
		}

		void UpdateTitle (View view)
		{
			_hostPane.Title = $"{view.GetType ().Name} - {view.X}, {view.Y}, {view.Width}, {view.Height}";
		}

		List<Type> GetAllViewClassesCollection ()
		{
			var types = new List<Type> ();
			foreach (var type in typeof (View).Assembly.GetTypes ()
				.Where (myType => myType.IsClass && !myType.IsAbstract && myType.IsPublic && myType.IsSubclassOf (typeof (View)))) {
				types.Add (type);
			}
			return types;
		}

		View CreateClass (Type type)
		{
			// If we are to create a generic Type
			if (type.IsGenericType) {

				// For each of the <T> arguments
				var typeArguments = new List<Type> ();

				// use <object>
				foreach (var arg in type.GetGenericArguments ()) {
					typeArguments.Add (typeof (object));
				}

				// And change what type we are instantiating from MyClass<T> to MyClass<object>
				type = type.MakeGenericType (typeArguments.ToArray ());
			}
			// Instantiate view
			var view = (View)Activator.CreateInstance (type);

			//_curView.X = Pos.Center ();
			//_curView.Y = Pos.Center ();
			view.Width = Dim.Percent (75);
			view.Height = Dim.Percent (75);

			// Set the colorscheme to make it stand out if is null by default
			if (view.ColorScheme == null) {
				view.ColorScheme = Colors.Base;
			}

			// If the view supports a Text property, set it so we have something to look at
			if (view.GetType ().GetProperty ("Text") != null) {
				try {
					view.GetType ().GetProperty ("Text")?.GetSetMethod ()?.Invoke (view, new [] { "Test Text" });
				} catch (TargetInvocationException e) {
					MessageBox.ErrorQuery ("Exception", e.InnerException.Message, "Ok");
					view = null;
				}
			}

			// If the view supports a Title property, set it so we have something to look at
			if (view != null && view.GetType ().GetProperty ("Title") != null) {
				if (view.GetType ().GetProperty ("Title").PropertyType == typeof (string)) {
					view?.GetType ().GetProperty ("Title")?.GetSetMethod ()?.Invoke (view, new [] { "Test Title" });
				} else {
					view?.GetType ().GetProperty ("Title")?.GetSetMethod ()?.Invoke (view, new [] { "Test Title" });
				}
			}

			// If the view supports a Source property, set it so we have something to look at
			if (view != null && view.GetType ().GetProperty ("Source") != null && view.GetType ().GetProperty ("Source").PropertyType == typeof (IListDataSource)) {
				var source = new ListWrapper (new List<string> { "Test Text #1", "Test Text #2", "Test Text #3" });
				view?.GetType ().GetProperty ("Source")?.GetSetMethod ()?.Invoke (view, new [] { source });
			}

			// Set Settings
			_computedCheckBox.Checked = view.LayoutStyle == LayoutStyle.Computed;

			// Add
			_hostPane.Add (view);
			//DimPosChanged ();
			_hostPane.LayoutSubviews ();
			_hostPane.Clear ();
			_hostPane.SetNeedsDisplay ();
			UpdateSettings (view);
			UpdateTitle (view);

			view.LayoutComplete += LayoutCompleteHandler;

			return view;
		}

		void LayoutCompleteHandler (object sender, LayoutEventArgs args)
		{
			UpdateTitle (_curView);
		}
	}
}