using ComponentProgramming.Exceptions;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace ComponentProgramming
{
    public partial class ControlTextBox : UserControl
    {
        public ControlTextBox()
        {
            InitializeComponent();
        }

        private string? _numPattern;

        public string? NumPattern
        {
            get { return _numPattern; }
            set { _numPattern = value; }
        }

        public int? IntegerValue
        {
            get
            {
                if (checkBoxNull.Checked)
                {
                    return null;
                }
                if (string.IsNullOrWhiteSpace(textBox.Text))
                {
                    return null;
                }
                if (int.TryParse(textBox.Text, out int value))
                {
                    return value;
                }
                throw new FormatException("Введенное значение не является целым числом.");
            }
            set
            {
                if (value.HasValue)
                {
                    textBox.Text = value.ToString();
                    checkBoxNull.Checked = false;
                }
                else
                {
                    textBox.Text = string.Empty;
                    checkBoxNull.Checked = true;
                }
            }
        }

        private event EventHandler? _textBoxChanged;

        public event EventHandler TextBoxChanged
        {
            add { _textBoxChanged += value; }
            remove { _textBoxChanged -= value; }
        }

        private void textBox_TextChanged(object sender, EventArgs e)
        {
            _textBoxChanged?.Invoke(this, e);
        }

        private void checkBoxNull_CheckedChanged(object sender, EventArgs e)
        {
            textBox.Enabled = !checkBoxNull.Checked;
            _textBoxChanged?.Invoke(this, e);
        }
    }
}