PredicateParty!

namespace _10.Predicate_Party_
{
    using System;
    using System.Collections.Generic;
    using System.Linq;

    public class Program
    {
        public static void Main()
        {
            List<string> guests = SplitStringToArray(Console.ReadLine()).ToList();

            Dictionary<string, Func<string, string, bool>> allCriteria = new Dictionary<string, Func<string, string, bool>>
            {
                ["StartsWith"] = (n, s) => n.StartsWith(s),
                ["EndsWith"] = (n, s) => n.EndsWith(s),
                ["Length"] = (n, s) => n.Length == int.Parse(s),
            };

            Dictionary<string, Action<string, Func<string, string, bool>>> allActions = new Dictionary<string, Action<string, Func<string, string, bool>>>
            {
                ["Remove"] = (str, func) =>
                {
                    for (int currentElement = 0; currentElement < guests.Count; currentElement++)
                    {
                        string currentGuest = guests[currentElement];
                        if (func(currentGuest, str))
                        {
                            guests.RemoveAt(currentElement);
                            currentElement--;
                        }
                    }
                },
                ["Double"] = (str, func) =>
                {
                    for (int currentElement = 0; currentElement < guests.Count; currentElement++)
                    {
                        string currentGuest = guests[currentElement];
                        if (func(currentGuest, str))
                        {
                            guests.Insert(currentElement, currentGuest);
                            currentElement++;
                        }
                    }
                }
            };

            string inputLine;
            while ((inputLine = Console.ReadLine()) != "Party!")
            {
                string[] queryInfo = SplitStringToArray(inputLine);

                string action = queryInfo[0];
                string criteria = queryInfo[1];
                string toMatch = queryInfo[2];

                Func<string, string, bool> currentCriteria = allCriteria[criteria];
                allActions[action](toMatch, currentCriteria);
            }

            Console.WriteLine(guests.Count == 0 ? "Nobody is going to the party!" :
                                                 $"{string.Join(", ", guests)} are going to the party!");
        }

        private static string[] SplitStringToArray(string toSplit)
        {
            return toSplit.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
        }
    }
}