using System;
using System.Collections.Generic;

namespace TicTacTow
{
    class TicTacToe
    {
        List<string> CurrentBoardLayout = new List<string> { "1", "2", "3", "4", "5", "6", "7", "8", "9"};
        bool HasGameFinished = false;

        public void Play()
        {
            UpdateBoard();

            while (!HasGameFinished)
            {
                Console.WriteLine("\nPlayer1:");
                int player1Pos = RequestInput();
                CurrentBoardLayout[player1Pos - 1] = "X";

                UpdateBoard();
                if (CheckWinner())
                {
                    break;
                }

                Console.WriteLine("\nPlayer2:");
                int player2Pos = RequestInput();
                CurrentBoardLayout[player2Pos - 1] = "O";

                UpdateBoard();

                CheckWinner();
            }
        }

        void UpdateBoard()
        {
            Console.Clear();
            Console.WriteLine("Player1: X   Player2: O");
            Console.WriteLine($"\n[{CurrentBoardLayout[0]}]\t[{CurrentBoardLayout[1]}]\t[{CurrentBoardLayout[2]}]");
            Console.WriteLine($"\n[{CurrentBoardLayout[3]}]\t[{CurrentBoardLayout[4]}]\t[{CurrentBoardLayout[5]}]");
            Console.WriteLine($"\n[{CurrentBoardLayout[6]}]\t[{CurrentBoardLayout[7]}]\t[{CurrentBoardLayout[8]}]");
        }

        int RequestInput()
        {
            Console.WriteLine("\nWhere do you want to go? (Use numbers 1 - 9)");

            int number = 0;
            bool isInputStringValid = false;
            while (!isInputStringValid)
            {
                string inputString = Console.ReadLine();

                if (Int32.TryParse(inputString, out number))
                {
                    if (number >= 1 && number <= 9)
                    {
                        if (CurrentBoardLayout[number - 1] != "X" && CurrentBoardLayout[number - 1] != "O")
                        {
                            isInputStringValid = true;
                        }
                        else
                        {
                            Console.WriteLine($"That tile is already marked with {CurrentBoardLayout[number]}");
                        }
                    }
                    else
                    {
                        Console.WriteLine("Number wasn't a valid number. The number must be between 1 and 9");
                    }
                }
                else
                {
                    Console.WriteLine("Value inputted wasn't a number. Please enter a number between 1 and 9");
                }
            }

            return number;
        }

        bool CheckWinner()
        {
            bool isThereAWinner = false;
            string winningPlayer = "";

            // Check horiozontal wins
            if (CurrentBoardLayout[0] == CurrentBoardLayout[1] && CurrentBoardLayout[1] == CurrentBoardLayout[2])
            {
                isThereAWinner = true;
                winningPlayer = CurrentBoardLayout[0];
            }

            if (CurrentBoardLayout[3] == CurrentBoardLayout[4] && CurrentBoardLayout[4] == CurrentBoardLayout[5])
            {
                isThereAWinner = true;
                winningPlayer = CurrentBoardLayout[3];
            }

            if (CurrentBoardLayout[6] == CurrentBoardLayout[7] && CurrentBoardLayout[7] == CurrentBoardLayout[8])
            {
                isThereAWinner = true;
                winningPlayer = CurrentBoardLayout[6];
            }

            // Check vertical wins
            if (CurrentBoardLayout[0] == CurrentBoardLayout[3] && CurrentBoardLayout[3] == CurrentBoardLayout[6])
            {
                isThereAWinner = true;
                winningPlayer = CurrentBoardLayout[0];
            }

            if (CurrentBoardLayout[1] == CurrentBoardLayout[4] && CurrentBoardLayout[4] == CurrentBoardLayout[7])
            {
                isThereAWinner = true;
                winningPlayer = CurrentBoardLayout[1];
            }

            if (CurrentBoardLayout[2] == CurrentBoardLayout[5] && CurrentBoardLayout[5] == CurrentBoardLayout[8])
            {
                isThereAWinner = true;
                winningPlayer = CurrentBoardLayout[2];
            }

            // Check diagonal wins
            if (CurrentBoardLayout[0] == CurrentBoardLayout[4] && CurrentBoardLayout[4] == CurrentBoardLayout[8])
            {
                isThereAWinner = true;
                winningPlayer = CurrentBoardLayout[0];
            }

            if (CurrentBoardLayout[2] == CurrentBoardLayout[4] && CurrentBoardLayout[4] == CurrentBoardLayout[6])
            {
                isThereAWinner = true;
                winningPlayer = CurrentBoardLayout[2];
            }

            // Check if game is a draw
            bool isThereEmptyTiles = false;

            foreach (string position in CurrentBoardLayout)
            {
                if (position != "X" && position != "O")
                {
                    isThereEmptyTiles = true;
                }
            }

            if (!isThereEmptyTiles && !isThereAWinner)
            {
                isThereAWinner = true;
                winningPlayer = "both";
            }

            if (isThereAWinner)
            {
                HasGameFinished = true;

                if (winningPlayer == "both")
                {
                    Console.WriteLine("Game is a draw");
                }
                else
                {
                    Console.WriteLine($"Winner is: {(winningPlayer == "X" ? "Player1" : "Player2")}");
                }
            }

            return isThereAWinner;
        }
    }
}