using System;
using System.IO;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using Terminal.Gui;
using Terminal.Gui.TextValidateProviders;


namespace UICatalog.Scenarios {
	[ScenarioMetadata (Name: "Text Input Controls", Description: "Tests all text input controls")]
	[ScenarioCategory ("Controls")]
	[ScenarioCategory ("Mouse and Keyboard")]
	[ScenarioCategory ("Text and Formatting")]
	public class Text : Scenario {
		public override void Setup ()
		{
			// TextField is a simple, single-line text input control
			var textField = new TextField ("TextField with test text. Unicode shouldn't 𝔹Aℝ𝔽!") {
				X = 1,
				Y = 0,
				Width = Dim.Percent (50) - 1,
				// Height will be replaced with 1
				Height = 2
			};

			var singleWordGenerator = new SingleWordSuggestionGenerator ();
			textField.Autocomplete.SuggestionGenerator = singleWordGenerator;

			textField.TextChanging += TextField_TextChanging;

			void TextField_TextChanging (object sender, TextChangingEventArgs e)
			{
				singleWordGenerator.AllSuggestions = Regex.Matches (e.NewText, "\\w+")
				    .Select (s => s.Value)
				    .Distinct ().ToList ();
			}
			Win.Add (textField);

			var labelMirroringTextField = new Label (textField.Text) {
				X = Pos.Right (textField) + 1,
				Y = Pos.Top (textField),
				Width = Dim.Fill (1) - 1
			};
			Win.Add (labelMirroringTextField);

			textField.TextChanged += (s, prev) => {
				labelMirroringTextField.Text = textField.Text;
			};

			// TextView is a rich (as in functionality, not formatting) text editing control
			var textView = new TextView () {
				X = 1,
				Y = Pos.Bottom (textField) + 1,
				Width = Dim.Percent (50) - 1,
				Height = Dim.Percent (30),
			};
			textView.Text = "TextView with some more test text. Unicode shouldn't 𝔹Aℝ𝔽!";
			textView.DrawContent += TextView_DrawContent;

			// This shows how to enable autocomplete in TextView.
			void TextView_DrawContent (object sender, DrawEventArgs e)
			{
				singleWordGenerator.AllSuggestions = Regex.Matches (textView.Text, "\\w+")
				    .Select (s => s.Value)
				    .Distinct ().ToList ();
			}
			Win.Add (textView);

			var labelMirroringTextView = new Label () {
				X = Pos.Right (textView) + 1,
				Y = Pos.Top (textView),
				Width = Dim.Fill (1) - 1,
				Height = Dim.Height (textView) - 1,
			};
			Win.Add (labelMirroringTextView);

			// Use ContentChanged to detect if the user has typed something in a TextView.
			// The TextChanged property is only fired if the TextView.Text property is
			// explicitly set
			textView.ContentsChanged += (s, a) => {
				labelMirroringTextView.Enabled = !labelMirroringTextView.Enabled;
				labelMirroringTextView.Text = textView.Text;
			};

			// By default TextView is a multi-line control. It can be forced to 
			// single-line mode.
			var chxMultiline = new CheckBox ("Multiline") {
				X = Pos.Left (textView),
				Y = Pos.Bottom (textView),
				Checked = textView.Multiline
			};
			Win.Add (chxMultiline);

			var chxWordWrap = new CheckBox ("Word Wrap") {
				X = Pos.Right (chxMultiline) + 2,
				Y = Pos.Top (chxMultiline),
				Checked = textView.WordWrap
			};
			chxWordWrap.Toggled += (s, e) => textView.WordWrap = (bool)e.NewValue;
			Win.Add (chxWordWrap);

			// TextView captures Tabs (so users can enter /t into text) by default;
			// This means using Tab to navigate doesn't work by default. This shows
			// how to turn tab capture off.
			var chxCaptureTabs = new CheckBox ("Capture Tabs") {
				X = Pos.Right (chxWordWrap) + 2,
				Y = Pos.Top (chxWordWrap),
				Checked = textView.AllowsTab
			};

			chxMultiline.Toggled += (s, e) => {
				textView.Multiline = (bool)e.NewValue;
				if (!textView.Multiline && (bool)chxWordWrap.Checked) {
					chxWordWrap.Checked = false;
				}
				if (!textView.Multiline && (bool)chxCaptureTabs.Checked) {
					chxCaptureTabs.Checked = false;
				}
			};

			Key keyTab = textView.GetKeyFromCommand (Command.Tab);
			Key keyBackTab = textView.GetKeyFromCommand (Command.BackTab);
			chxCaptureTabs.Toggled += (s, e) => {
				if (e.NewValue == true) {
					textView.AddKeyBinding (keyTab, Command.Tab);
					textView.AddKeyBinding (keyBackTab, Command.BackTab);
				} else {
					textView.ClearKeyBinding (keyTab);
					textView.ClearKeyBinding (keyBackTab);
				}
				textView.AllowsTab = (bool)e.NewValue;
			};
			Win.Add (chxCaptureTabs);

			var hexEditor = new HexView (new MemoryStream (Encoding.UTF8.GetBytes ("HexEditor Unicode that shouldn't 𝔹Aℝ𝔽!"))) {
				X = 1,
				Y = Pos.Bottom (chxMultiline) + 1,
				Width = Dim.Percent (50) - 1,
				Height = Dim.Percent (30),
			};
			Win.Add (hexEditor);

			var labelMirroringHexEditor = new Label () {
				X = Pos.Right (hexEditor) + 1,
				Y = Pos.Top (hexEditor),
				Width = Dim.Fill (1) - 1,
				Height = Dim.Height (hexEditor) - 1,
			};
			var array = ((MemoryStream)hexEditor.Source).ToArray ();
			labelMirroringHexEditor.Text = Encoding.UTF8.GetString (array, 0, array.Length);
			hexEditor.Edited += (s, kv) => {
				hexEditor.ApplyEdits ();
				var array = ((MemoryStream)hexEditor.Source).ToArray ();
				labelMirroringHexEditor.Text = Encoding.UTF8.GetString (array, 0, array.Length);
			};
			Win.Add (labelMirroringHexEditor);

			var dateField = new DateField (System.DateTime.Now) {
				X = 1,
				Y = Pos.Bottom (hexEditor) + 1,
				Width = 20,
				IsShortFormat = false
			};
			Win.Add (dateField);

			var labelMirroringDateField = new Label (dateField.Text) {
				X = Pos.Right (dateField) + 1,
				Y = Pos.Top (dateField),
				Width = Dim.Width (dateField),
				Height = Dim.Height (dateField),
			};
			Win.Add (labelMirroringDateField);

			dateField.TextChanged += (s, prev) => {
				labelMirroringDateField.Text = dateField.Text;
			};

			_timeField = new TimeField (DateTime.Now.TimeOfDay) {
				X = Pos.Right (labelMirroringDateField) + 5,
				Y = Pos.Bottom (hexEditor) + 1,
				Width = 20,
				IsShortFormat = false
			};
			Win.Add (_timeField);

			_labelMirroringTimeField = new Label (_timeField.Text) {
				X = Pos.Right (_timeField) + 1,
				Y = Pos.Top (_timeField),
				Width = Dim.Width (_timeField),
				Height = Dim.Height (_timeField),
			};
			Win.Add (_labelMirroringTimeField);

			_timeField.TimeChanged += TimeChanged;

			// MaskedTextProvider - uses .NET MaskedTextProvider
			var netProviderLabel = new Label ("NetMaskedTextProvider [ 999 000 LLL >LLL| AAA aaa ]") {
				X = Pos.Left (dateField),
				Y = Pos.Bottom (dateField) + 1
			};
			Win.Add (netProviderLabel);

			var netProvider = new NetMaskedTextProvider ("999 000 LLL > LLL | AAA aaa");

			var netProviderField = new TextValidateField (netProvider) {
				X = Pos.Right (netProviderLabel) + 1,
				Y = Pos.Y (netProviderLabel),
			};

			Win.Add (netProviderField);

			// TextRegexProvider - Regex provider implemented by Terminal.Gui
			var regexProvider = new Label ("TextRegexProvider [ ^([0-9]?[0-9]?[0-9]|1000)$ ]") {
				X = Pos.Left (netProviderLabel),
				Y = Pos.Bottom (netProviderLabel) + 1
			};
			Win.Add (regexProvider);

			var provider2 = new TextRegexProvider ("^([0-9]?[0-9]?[0-9]|1000)$") { ValidateOnInput = false };
			var regexProviderField = new TextValidateField (provider2) {
				X = Pos.Right (regexProvider) + 1,
				Y = Pos.Y (regexProvider),
				Width = 30,
				TextAlignment = TextAlignment.Centered
			};

			Win.Add (regexProviderField);

			var labelAppendAutocomplete = new Label ("Append Autocomplete:") {
				Y = Pos.Y (regexProviderField) + 2,
				X = 1
			};
			var appendAutocompleteTextField = new TextField () {
				X = Pos.Right (labelAppendAutocomplete),
				Y = labelAppendAutocomplete.Y,
				Width = Dim.Fill ()
			};
			appendAutocompleteTextField.Autocomplete = new AppendAutocomplete (appendAutocompleteTextField);
			appendAutocompleteTextField.Autocomplete.SuggestionGenerator = new SingleWordSuggestionGenerator {
				AllSuggestions = new System.Collections.Generic.List<string>{
					"fish", "flipper", "fin","fun","the","at","there","some","my","of","be","use","her","than","and","this","an","would","first","have","each","make","water","to","from","which","like","been","in","or","she","him","call","is","one","do","into","who","you","had","how","time","oil","that","by","their","has","its","it","word","if","look","now","he","but","will","two","find","was","not","up","more","long","for","what","other","write","down","on","all","about","go","day","are","were","out","see","did","as","we","many","number","get","with","when","then","no","come","his","your","them","way","made","they","can","these","could","may","said","so","people","part"
				}
			};

			Win.Add (labelAppendAutocomplete);
			Win.Add (appendAutocompleteTextField);
		}

		TimeField _timeField;
		Label _labelMirroringTimeField;

		private void TimeChanged (object sender, DateTimeEventArgs<TimeSpan> e)
		{
			_labelMirroringTimeField.Text = _timeField.Text;
		}
	}
}
