using System;
using System.Globalization;
using System.Text.RegularExpressions;
using UnityEngine;

namespace BitStrap
{
	public static class StringExtensions
	{
		public static DateTime ToDateTime(this string self)
		{
			try
			{
				return DateTime.ParseExact(self, "yyyy-MM-dd HH:mm:ss zzz", CultureInfo.InvariantCulture);
			}
			catch (Exception)
			{
				return DateTime.MinValue;
			}
		}

		public static string SeparateCamelCase(this string self, string separator = " ")
		{
			return Regex.Replace(self, "(?<=[a-z])([A-Z])", separator + "$1").Trim();
		}

		public static int Distance(this string source, string target)
		{
			if (string.IsNullOrEmpty(source))
			{
				if (string.IsNullOrEmpty(target))
				{
					return 0;
				}
				return target.Length;
			}
			if (string.IsNullOrEmpty(target))
			{
				return source.Length;
			}
			if (source.Length > target.Length)
			{
				string text = target;
				target = source;
				source = text;
			}
			int length = target.Length;
			int length2 = source.Length;
			int[,] array = new int[2, length + 1];
			for (int i = 1; i <= length; i++)
			{
				array[0, i] = i;
			}
			int num = 0;
			for (int j = 1; j <= length2; j++)
			{
				num = j & 1;
				array[num, 0] = j;
				int num2 = num ^ 1;
				for (int k = 1; k <= length; k++)
				{
					int num3 = ((target[k - 1] != source[j - 1]) ? 1 : 0);
					array[num, k] = Mathf.Min(Mathf.Min(array[num2, k] + 1, array[num, k - 1] + 1), array[num2, k - 1] + num3);
				}
			}
			return array[num, length];
		}
	}
}