Exam prep 1 | 04. Winning ticket

namespace _04_Winning_ticket
{
    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using System.Threading.Tasks;
    class Program
    {
        static void Main()
        {
            string[] tickets = Console.ReadLine()
                .Split(new[] { ',', ' ' }, StringSplitOptions.RemoveEmptyEntries);

            char[] winningSymbols = new char[] { '@', '^', '$', '#' };

            foreach (var ticket in tickets)
            {
                int winPrice = 0;
                bool isTicketValid = false;
                var winChar = ' ';
                if (ticket.Length == 20)
                {
                    isTicketValid = true;
                    bool ticketContainsWinningChar = false;
                    var mostCommonChar = GetMostCommonChar(ticket, winningSymbols);

                    if (winningSymbols.Contains(mostCommonChar))
                        ticketContainsWinningChar = true;

                    if (ticketContainsWinningChar)
                    {
                        int leftCount = 0;
                        int rightCount = 0;
                        int bestLeftCount = 0;
                        int bestRightCount = 0;
                        //Check left char count.
                        for (int i = 0; i < ticket.Length / 2; i++)
                        {
                            var currentChar = ticket[i];
                            if (currentChar == mostCommonChar)
                            {
                                leftCount++;
                                if (leftCount > bestLeftCount)
                                {
                                    bestLeftCount = leftCount;
                                }
                                else
                                {
                                    leftCount = 0;
                                }
                            }
                        }
                        //Check right char count.
                        for (int i = ticket.Length / 2; i < ticket.Length; i++)
                        {
                            var currentChar = ticket[i];
                            if (currentChar == mostCommonChar)
                            {
                                rightCount++;
                                if (rightCount > bestRightCount)
                                {
                                    bestRightCount = rightCount;
                                }
                                else
                                {
                                    rightCount = 0;
                                }
                            }
                        }

                        // If left && right char count uninterruptedly repeat
                        // for at least 6 times in both sides:
                        // ->win char count is math.min of both sides count
                        if (bestRightCount >= 6 && 6 <= bestLeftCount)
                        {
                            winPrice = Math.Min(bestRightCount, bestLeftCount); //potential problem
                            winChar = mostCommonChar;
                        }
                    }

                    if (isTicketValid == true)
                    {
                        bool isJackpotHit = false;
                        if (winPrice == 10)
                        {
                            isJackpotHit = true;
                        }

                        if (isJackpotHit == false && winPrice != 0)
                        {
                            Console.WriteLine($"ticket \"{ticket}\" - {winPrice}{winChar}");
                        }

                        else if (isJackpotHit == true && winPrice != 0)
                        {
                            Console.WriteLine($"ticket \"{ticket}\" - {winPrice}{winChar} Jackpot!");
                        }

                        else
                        {
                            Console.WriteLine($"ticket \"{ticket}\" - no match");
                        }
                    }
                }

                else
                {
                    Console.WriteLine("invalid ticket");
                }
            }
        }

        static char GetMostCommonChar(string ticket, char[] winningSymbols)
        {
            int currentCount = 0;
            int bestCount = 0;
            char winningChar = '/'; //placeholder.

            for (int i = 0; i < ticket.Length; i++)
            {
                var currentChar = ticket[i];
                if (winningSymbols.Contains(currentChar))
                {
                    currentCount++;
                    if (currentCount > bestCount)
                    {
                        bestCount = currentCount;
                        winningChar = currentChar;
                    }
                }

                else
                {
                    currentCount = 0;
                }
            }

            return winningChar;
        }
    }
}