using Sarand.Net.Mobile.Maui.App;
using Sarand.Net.Standard.Base.App;
using Sarand.Net.Standard.Base.Utils;
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Sarand.Net.Mobile.Maui.Controls
{
	//=======================================================================
	public class SamEntry : Entry
	{
		//-------------------------------------------------------------------
		// Definitions.
		public enum TextCaseType
		{
			Normal,
			Upper,
			Lower,
			Title
		}

		//-------------------------------------------------------------------
		// Data members.
		private bool trimTextOnCompletion = true;
		private TextInfo textInfo = CultureInfo.CurrentCulture.TextInfo;
		private TextCaseType textCase = TextCaseType.Normal;
		private bool numericOnly = false;
		private byte decimals = 0;

		//-------------------------------------------------------------------
		// Construction.
		public SamEntry()
		{
			DefaultFontSize = FontSize;
			TextChanged += SamEntry_TextChanged;
			Completed += SamEntry_Completed;
		}

		//-------------------------------------------------------------------
		// Properties.
		public bool TrimText
		{
			get { return trimTextOnCompletion; }
			set
			{
				if (trimTextOnCompletion == value) return;
				trimTextOnCompletion = value;
			}
		}
		/// <summary>
		/// Whether to format text as it is entered.
		/// <para>NB This can lead to problems with the cursor position and typing doesn't give expected results.</para>
		/// <para>Default: False.</para>
		/// </summary>
		public bool FormatTextOnChange { get; set; } = false;
		public double DefaultFontSize { get; }
		public TextCaseType TextCase
		{
			get { return textCase; }
			set
			{
				if (textCase == value) return;
				textCase = value;
				FormatText();
			}
		}
		public bool NumericOnly
		{
			get { return numericOnly; }
			set
			{
				if (numericOnly == value) return;
				numericOnly = value;
				if (numericOnly)
					HorizontalTextAlignment = TextAlignment.End;
				Keyboard = Keyboard.Numeric;
				FormatText();
			}
		}
		public byte Decimals
		{
			get { return decimals; }
			set
			{
				if (numericOnly && decimals == value) return;
				numericOnly = true;
				HorizontalTextAlignment = TextAlignment.End;
				decimals = value;
				Keyboard = Keyboard.Numeric;
				FormatText();
			}
		}

		// Native behaviour modified by SamHandler.
		public bool NativeNoBorder { get; set; } = Sam.Visuals.Form.Controls.NativeNoBorder;
		public bool NativeNoUnderline { get; set; } = Sam.Visuals.Form.Controls.NativeNoUnderline;
		public bool NativeBackgroundClear { get; set; } = Sam.Visuals.Form.Controls.NativeBackgroundClear;

		//-------------------------------------------------------------------
		//                       F o r m a t   T e x t
		//-------------------------------------------------------------------
		private void FormatText(bool trimText = false)
		{
			String fn = GetType().Name + ".FormatText";
			String originalText = Text;
			String formattedText = originalText;
			if (StringUtil.IsEmpty(formattedText)) return;
			if (trimText)
				formattedText = StringUtil.TrimAll(formattedText);

			if (numericOnly)
			{
				if (decimals > 0)
				{
					decimal value = StringUtil.ToDecimal(formattedText);
					if (value != 0.0m)
						formattedText = value.ToString("N" + decimals);
					else if (!formattedText.Equals("0"))
						formattedText = "";
				}
				else
				{
					long value = StringUtil.ToLong(formattedText);
					if (value != 0)
						formattedText = value.ToString();
					else if (!formattedText.Equals("0"))
						formattedText = "";
				}
			}
			else
			{
				if (textCase == TextCaseType.Upper)
					formattedText = textInfo.ToUpper(formattedText);
				else if (textCase == TextCaseType.Lower)
					formattedText = textInfo.ToLower(formattedText);
				else if (textCase == TextCaseType.Title)
					formattedText =
						StringUtil.ToTitleCase(formattedText, textInfo);
			}

			if (!originalText.Equals(formattedText))
			{
				SaLogger.Debug(fn + " Text: " + originalText + ". Formatted: " + formattedText);
				Text = formattedText;
			}
		}

		//-------------------------------------------------------------------
		//                    C o n t r o l   E v e n t s
		//-------------------------------------------------------------------
		private void SamEntry_TextChanged(object? sender, TextChangedEventArgs e)
		{
			if (FormatTextOnChange) FormatText();
		}
		private void SamEntry_Completed(object? sender, EventArgs e)
		{
			FormatText(trimTextOnCompletion);
		}

		//-------------------------------------------------------------------
	}
	//=======================================================================
}