using System;
using System.Collections.Generic;
using System.Globalization;

namespace Developpez.Dotnet.Language
{
    internal static class SpellerHelper
    {
        public static void SplitDouble(double value, int decimalPlaces, bool trimTrailingDecimalZeros, out long integralPart, out long decimalPart, out int zerosAfterDecimal)
        {
            double i = Math.Truncate(value);
            double d = Math.Round(Math.Abs((value - i)), decimalPlaces);
            int z = 0;
            for (int k = 0; k < decimalPlaces; k++)
            {
                d *= 10;
                if (d < 1.0)
                    z++;
            }
            integralPart = (long)Math.Abs(i);
            decimalPart = (long)Math.Round(d);
            while (trimTrailingDecimalZeros && decimalPart != 0 && decimalPart % 10 == 0)
                decimalPart /= 10;
            zerosAfterDecimal = z;
        }

        public static void SplitDecimal(decimal value, int decimalPlaces, bool trimTrailingDecimalZeros, out long integralPart, out long decimalPart, out int zerosAfterDecimal)
        {
            decimal i = Math.Truncate(value);
            decimal d = Math.Round(Math.Abs((value - i)), decimalPlaces);
            int z = 0;
            for (int k = 0; k < decimalPlaces; k++)
            {
                d *= 10;
                if (d < 1.0m)
                    z++;
            }
            integralPart = (long)Math.Abs(i);
            decimalPart = (long)d;
            while (trimTrailingDecimalZeros && decimalPart != 0 && decimalPart % 10 == 0)
                decimalPart /= 10;
            zerosAfterDecimal = z;
        }

        public static IEnumerable<CultureInfo> GetCultureAndParents(CultureInfo culture)
        {
            CultureInfo tmp = culture;
            while (tmp != null)
            {
                yield return tmp;
                if (tmp.Equals(tmp.Parent))
                    yield break;
                tmp = tmp.Parent;
            }
        }
    }
}