DSALib/Auxiliary/Dice.cs


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using System;
using System.Linq;

namespace DSALib.Auxiliary
{
    public static class Dice // roll it!
    {
        private static readonly Random Rnd = new Random();

        public static int Roll(int d = 20)
        {
            return Rnd.Next(d) + 1;
        }

        public static int Roll(string input)
        {
            var strings = input.ToLower().Split(new[] {'w', 'd'}, 2, StringSplitOptions.RemoveEmptyEntries).ToList();
            var count = Convert.ToInt32(strings[0]);
            var d = Convert.ToInt32(strings[0]);

            if (strings.Count != 2)
                throw new ArgumentException($"{input}: erfüllt nicht die Formatvogaben( Anzahl d Augenzahl)");

            return Roll(count, d);
        }

        public static int Roll(int count, int d)
        {
            if (d <= 0) return 0;

            var sum = 0;
            for (var i = 0; i < Math.Abs(count); i++)
            {
                var roll = Roll(d);
                sum += roll;
            }

            sum *= Math.Abs(count) / count;

            return sum;
        }
    }
}