using System;
using System.Text.RegularExpressions;
using System.Windows.Forms;

namespace PlayingWithWinForms {
	public partial class PhoneNumberView : Form {
		public PhoneNumberView( ) {
			InitializeComponent( );
			_phoneNumber = new BindableTextBox< IPhoneNumber >( uxPhoneNumberTextBox, CreateTypeFactory.PhoneNumber );
		}

		private IBindableTextBox< IPhoneNumber > _phoneNumber;
	}

	public interface IPhoneNumber {
		string Number { get; }
	}

	public class PhoneNumber : IPhoneNumber {
		public PhoneNumber( string number ) {
			const string expression = @"[\(\)\-\ ]";
			_number = ( null != number ) ? Regex.Replace( number, expression, String.Empty ) : string.Empty;
		}

		public string Number {
			get { return _number; }
		}

		public override string ToString( ) {
			return _number;
		}

		private readonly string _number;
	}

	public class BindableTextBox< T > : IBindableTextBox< T > {
		public BindableTextBox( TextBox control, CreateType< T > method ) {
			_control = control;
			_method = method;

			_control.Leave += delegate { BindTo( _method.Invoke( _control ) ); };
		}

		public T Value {
			get { return _value; }
		}

		public void BindTo( T item ) {
			_value = item;
			_control.Text = _value.ToString( );
		}

		private readonly TextBox _control;
		private readonly CreateType< T > _method;
		private T _value;
	}

	internal interface IBindableTextBox< T > {
		void BindTo( T item );

		T Value { get; }
	}

	public delegate T CreateType< T >( Control usingControl );

	public class CreateTypeFactory {
		public static CreateType< IPhoneNumber > PhoneNumber =
			delegate( Control control ) { return new PhoneNumber( control.Text ); };
	}
}