using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;

namespace SchoolProject
{
   public class Helper
    {
        public static void ErrorMessage(string TextMessagre)
        {
            MessageBox.Show(TextMessagre, "Ошибка", MessageBoxButton.OK, MessageBoxImage.Error);
        }

        public static void InformationMessage(string TextMessagre)
        {
            MessageBox.Show(TextMessagre, "Информация", MessageBoxButton.OK, MessageBoxImage.Information);
        }

        public static int LevenshteinDistance(string string1, string string2)
        {
            if (string1 == null) throw new ArgumentNullException("string1");
            if (string2 == null) throw new ArgumentNullException("string2");
            int diff;
            int[,] m = new int[string1.Length + 1, string2.Length + 1];

            for (int i = 0; i <= string1.Length; i++) { m[i, 0] = i; }
            for (int j = 0; j <= string2.Length; j++) { m[0, j] = j; }

            for (int i = 1; i <= string1.Length; i++)
            {
                for (int j = 1; j <= string2.Length; j++)
                {
                    diff = (string1[i - 1] == string2[j - 1]) ? 0 : 1;

                    m[i, j] = Math.Min(Math.Min(m[i - 1, j] + 1,
                                             m[i, j - 1] + 1),
                                             m[i - 1, j - 1] + diff);
                }
            }
            return m[string1.Length, string2.Length];
        }
    }
}