using System;
using System.Globalization;
using System.Text;

namespace YesNt.Interpreter.Utilities
{
    public static class StringExtentions
    {
        public static string ToSaveString(this string input)
        {
            StringBuilder output = new StringBuilder();
            foreach (char c in input)
            {
                output.Append($"\r{c}\r");
            }
            return output.ToString();
        }

        public static string FromSaveString(this string input)
        {
            return input.Replace("\r", "");
        }

        public static bool ToStandardizedNumber(this string input, out double result)
        {
            return double.TryParse(input.FromSaveString().Replace(',', '.'), NumberStyles.Any, CultureInfo.InvariantCulture, out result);
        }

        public static string ReplaceFirstOccurrence(this string input, string oldValue, string newValue)
        {
            int place = input.IndexOf(oldValue);
            return input.Remove(place, oldValue.Length).Insert(place, newValue);
        }

        public static string ReplaceLastOccurrence(this string input, string oldValue, string newValue)
        {
            int place = input.LastIndexOf(oldValue);
            return input.Remove(place, Math.Min(oldValue.Length, input.Length - place)).Insert(place, newValue);
        }

        public static int WhiteSpaceAtEnd(this string input)
        {
            int count = 0;
            int index = input.Length - 1;
            while (index >= 0 && char.IsWhiteSpace(input[index--]))
            {
                count++;
            }

            return count;
        }
    }
}