using System;
using System.Collections.Generic;

namespace MafiaCommon
{
    public static class ListUtils
    {
        public static void Shuffle<T> (this Random rng, T[] array)
        {
            int n = array.Length;
            while (n > 1) 
            {
                int k = rng.Next(n--);
                T temp = array[n];
                array[n] = array[k];
                array[k] = temp;
            }
        }
        
        public static T[] RemoveFromArray<T> (this T[] original, int numIdx) {
            if (numIdx == -1) return original;
            List<T> tmp = new List<T>(original);
            tmp.RemoveAt(numIdx);
            return tmp.ToArray();
        }

        public static void AddEmpty<T>(this Dictionary<T, int> original, T id, int add)
        {
            if (original.ContainsKey(id))
            {
                original[id] += add;
            }
            else
            {
                original.Add(id,add);
            }
        }
    }
}