using System.Text;
using System;
using System.Collections.Generic;
using Terminal.Gui;

namespace UICatalog.Scenarios {
	[ScenarioMetadata (Name: "Dialogs", Description: "Demonstrates how to the Dialog class")]
	[ScenarioCategory ("Dialogs")]
	public class Dialogs : Scenario {
		static int CODE_POINT = '你'; // We know this is a wide char

		public override void Setup ()
		{
			var frame = new FrameView ("Dialog Options") {
				X = Pos.Center (),
				Y = 1,
				Width = Dim.Percent (75),
			};

			var label = new Label ("Width:") {
				X = 0,
				Y = 0,
				Width = 15,
				Height = 1,
				TextAlignment = Terminal.Gui.TextAlignment.Right,
			};
			frame.Add (label);

			var widthEdit = new TextField ("0") {
				X = Pos.Right (label) + 1,
				Y = Pos.Top (label),
				Width = 5,
				Height = 1
			};
			frame.Add (widthEdit);

			label = new Label ("Height:") {
				X = 0,
				Y = Pos.Bottom (label),
				Width = Dim.Width (label),
				Height = 1,
				TextAlignment = Terminal.Gui.TextAlignment.Right,
			};
			frame.Add (label);

			var heightEdit = new TextField ("0") {
				X = Pos.Right (label) + 1,
				Y = Pos.Top (label),
				Width = 5,
				Height = 1
			};
			frame.Add (heightEdit);

			frame.Add (new Label ("If height & width are both 0,") {
				X = Pos.Right (widthEdit) + 2,
				Y = Pos.Top (widthEdit),
			});
			frame.Add (new Label ("the Dialog will size to 80% of container.") {
				X = Pos.Right (heightEdit) + 2,
				Y = Pos.Top (heightEdit),
			});

			label = new Label ("Title:") {
				X = 0,
				Y = Pos.Bottom (label),
				Width = Dim.Width (label),
				Height = 1,
				TextAlignment = Terminal.Gui.TextAlignment.Right,
			};
			frame.Add (label);

			var titleEdit = new TextField ("Title") {
				X = Pos.Right (label) + 1,
				Y = Pos.Top (label),
				Width = Dim.Fill (),
				Height = 1
			};
			frame.Add (titleEdit);

			label = new Label ("Num Buttons:") {
				X = 0,
				Y = Pos.Bottom (label),  // BUGBUG: if this is Pos.Bottom (titleEdit) the initial LayoutSubviews does not work correctly?!?!
				Width = Dim.Width (label),
				Height = 1,
				TextAlignment = Terminal.Gui.TextAlignment.Right,
			};
			frame.Add (label);

			var numButtonsEdit = new TextField ("3") {
				X = Pos.Right (label) + 1,
				Y = Pos.Top (label),
				Width = 5,
				Height = 1
			};
			frame.Add (numButtonsEdit);

			var glyphsNotWords = new CheckBox ($"Add {Char.ConvertFromUtf32 (CODE_POINT)} to button text to stress wide char support", false) {
				X = Pos.Left (numButtonsEdit),
				Y = Pos.Bottom (label),
				TextAlignment = Terminal.Gui.TextAlignment.Right,
			};
			frame.Add (glyphsNotWords);

			label = new Label ("Button Style:") {
				X = 0,
				Y = Pos.Bottom (glyphsNotWords),
				TextAlignment = Terminal.Gui.TextAlignment.Right
			};
			frame.Add (label);

			var styleRadioGroup = new RadioGroup (new string [] { "Center", "Justify", "Left", "Right" }) {
				X = Pos.Right (label) + 1,
				Y = Pos.Top (label),
			};
			frame.Add (styleRadioGroup);

			frame.ForceValidatePosDim = true;
			void Top_Loaded (object sender, EventArgs args)
			{
				frame.Height =
					widthEdit.Frame.Height +
					heightEdit.Frame.Height +
					titleEdit.Frame.Height +
					numButtonsEdit.Frame.Height +
					glyphsNotWords.Frame.Height +
					styleRadioGroup.Frame.Height;
				Application.Top.Loaded -= Top_Loaded;
			}
			Application.Top.Loaded += Top_Loaded;

			Win.Add (frame);

			label = new Label ("Button Pressed:") {
				X = Pos.Center (),
				Y = Pos.Bottom (frame) + 4,
				Height = 1,
				TextAlignment = Terminal.Gui.TextAlignment.Right,
			};
			Win.Add (label);

			var buttonPressedLabel = new Label (" ") {
				X = Pos.Center (),
				Y = Pos.Bottom (frame) + 5,
				Width = 25,
				Height = 1,
				ColorScheme = Colors.Error,
			};
			// glyphsNotWords
			// false:var btnText = new [] { "Zero", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine" };
			// true: var btnText = new [] { "0", "\u2780", "➁", "\u2783", "\u2784", "\u2785", "\u2786", "\u2787", "\u2788", "\u2789" };
			// \u2781 is ➁ dingbats \ufb70 is	

			var showDialogButton = new Button ("Show Dialog") {
				X = Pos.Center (),
				Y = Pos.Bottom (frame) + 2,
				IsDefault = true,
			};
			showDialogButton.Clicked += (s, e) => {
				var dlg = CreateDemoDialog (widthEdit, heightEdit, titleEdit, numButtonsEdit, glyphsNotWords, styleRadioGroup, buttonPressedLabel);
				Application.Run (dlg);
			};

			Win.Add (showDialogButton);

			Win.Add (buttonPressedLabel);
		}

		Dialog CreateDemoDialog (TextField widthEdit, TextField heightEdit, TextField titleEdit, TextField numButtonsEdit, CheckBox glyphsNotWords, RadioGroup styleRadioGroup,  Label buttonPressedLabel)
		{
			Dialog dialog = null;
			try {

				int width = 0;
				int.TryParse (widthEdit.Text, out width);
				int height = 0;
				int.TryParse (heightEdit.Text, out height);
				int numButtons = 3;
				int.TryParse (numButtonsEdit.Text, out numButtons);

				var buttons = new List<Button> ();
				var clicked = -1;
				for (int i = 0; i < numButtons; i++) {
					int buttonId = i;
					Button button = null;
					if (glyphsNotWords.Checked == true) {
						buttonId = i;
						button = new Button (NumberToWords.Convert (buttonId) + " " + Char.ConvertFromUtf32 (buttonId + CODE_POINT),
							is_default: buttonId == 0);
					} else {
						button = new Button (NumberToWords.Convert (buttonId),
						       is_default: buttonId == 0);
					}
					button.Clicked += (s, e) => {
						clicked = buttonId;
						Application.RequestStop ();
					};
					buttons.Add (button);
				}
				//if (buttons.Count > 1) {
				//	buttons [1].Text = "Accept";
				//	buttons [1].IsDefault = true;
				//	buttons [0].Visible = false;
				//	buttons [0].Text = "_Back";
				//	buttons [0].IsDefault = false;
				//}

				// This tests dynamically adding buttons; ensuring the dialog resizes if needed and 
				// the buttons are laid out correctly
				dialog = new Dialog (buttons.ToArray ()) {
					Title = titleEdit.Text,
					ButtonAlignment = (Dialog.ButtonAlignments)styleRadioGroup.SelectedItem
				};
				if (height != 0 || width != 0) {
					dialog.Height = height;
					dialog.Width = width;
				}

				var add = new Button ("Add a button") {
					X = Pos.Center (),
					Y = Pos.Center ()
				};
				add.Clicked += (s, e) => {
					var buttonId = buttons.Count;
					Button button;
					if (glyphsNotWords.Checked == true) {
						button = new Button (NumberToWords.Convert (buttonId) + " " + Char.ConvertFromUtf32 (buttonId + CODE_POINT),
							is_default: buttonId == 0);
					} else {
						button = new Button (NumberToWords.Convert (buttonId),
							is_default: buttonId == 0);
					}
					button.Clicked += (s, e) => {
						clicked = buttonId;
						Application.RequestStop ();

					};
					buttons.Add (button);
					dialog.AddButton (button);
					if (buttons.Count > 1) {
						button.TabIndex = buttons [buttons.Count - 2].TabIndex + 1;
					}
				};
				dialog.Add (add);

				var addChar = new Button ($"Add a {Char.ConvertFromUtf32 (CODE_POINT)} to each button") {
					X = Pos.Center (),
					Y = Pos.Center () + 1
				};
				addChar.Clicked += (s, e) => {
					foreach (var button in buttons) {
						button.Text += Char.ConvertFromUtf32 (CODE_POINT);
					}
					dialog.LayoutSubviews ();
				};
				dialog.Closed += (s, e) => {
					buttonPressedLabel.Text = $"{clicked}";
				};
				dialog.Add (addChar);

			} catch (FormatException) {
				buttonPressedLabel.Text = "Invalid Options";
			}
			return dialog;
		}
	}
}