using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Main
{
	class Program
	{
		static void Main()
		{
			string[,] possition_array = { { ".", ".", "." }, { ".", ".", "." }, { ".", ".", "." } };
			Console.WriteLine("Hello Players!");
			Console.WriteLine("Following is the board, you will enter numbers 1-9 to put down your mark.");
			Draw_board(possition_array);
			Console.WriteLine("Please enter wether you are playing as X or O; ");
			string Player1 = Console.ReadLine();
			switch (Player1)
			{
				case "X":
					int x = 0;
					Play(x, possition_array);
					break;
				case "O":
					int i = 1;
					Play(i, possition_array);
					break;
				default:
					Console.WriteLine("Please enter either X or O, as represented, to start the game");
					Main();
					break;
			}
		}


		static void Play(int x, string[,] possition_array)
		{
			Victory_check(possition_array);
			Draw_board(possition_array);
			string[] player_array = new string[] { "X", "O" };
			Console.WriteLine("Please enter where you wish to put your mark, ", player_array[x], ".");
			string Player_entry = Console.ReadLine();
			switch (Player_entry)
			{
				case "1":
					if (possition_array[0, 0] == ".")
					{
						possition_array[0, 0] = player_array[x];
						Player_change(x, possition_array);
					}
					else
					{
						Console.WriteLine("There's already a mark here, please try another number.");
						Play(x, possition_array);
					}
					break;
				case "2":
					if (possition_array[0, 1] == ".")
					{
						possition_array[0, 1] = player_array[x];
						Player_change(x, possition_array);
					}
					else
					{
						Console.WriteLine("There's already a mark here, please try another number.");
						Play(x, possition_array);
					}
					break;
				case "3":
					if (possition_array[0, 2] == ".")
					{
						possition_array[0, 2] = player_array[x];
						Player_change(x, possition_array);
					}
					else
					{
						Console.WriteLine("There's already a mark here, please try another number.");
						Play(x, possition_array);
					}
					break;
				case "4":
					if (possition_array[1, 0] == ".")
					{
						possition_array[1, 0] = player_array[x];
						Player_change(x, possition_array);
					}
					else
					{
						Console.WriteLine("There's already a mark here, please try another number.");
						Play(x, possition_array);
					}
					break;
				case "5":
					if (possition_array[1, 1] == ".")
					{
						possition_array[1, 1] = player_array[x];
						Player_change(x, possition_array);
					}
					else
					{
						Console.WriteLine("There's already a mark here, please try another number.");
						Play(x, possition_array);
					}
					break;
				case "6":
					if (possition_array[1, 2] == ".")
					{
						possition_array[1, 2] = player_array[x];
						Player_change(x, possition_array);
					}
					else
					{
						Console.WriteLine("There's already a mark here, please try another number.");
						Play(x, possition_array);
					}
					break;
				case "7":
					if (possition_array[2, 0] == ".")
					{
						possition_array[2, 0] = player_array[x];
						Player_change(x, possition_array);
					}
					else
					{
						Console.WriteLine("There's already a mark here, please try another number.");
						Play(x, possition_array);
					}
					break;
				case "8":
					if (possition_array[2, 1] == ".")
					{
						possition_array[2, 1] = player_array[x];
						Player_change(x, possition_array);
					}
					else
					{
						Console.WriteLine("There's already a mark here, please try another number.");
						Play(x, possition_array);
					}
					break;
				case "9":
					if (possition_array[2, 2] == ".")
					{
						possition_array[2, 2] = player_array[x];
						Player_change(x, possition_array);
					}
					else
					{
						Console.WriteLine("There's already a mark here, please try another number.");
						Play(x, possition_array);
					}
					break;
				default:
					Console.WriteLine("Please enter a number 1-9.");
					Play(x, possition_array);
					break;

			}


		}

		static void Victory_check(string[,] possition_array)
		{
			for (int i = 0; i < 3; i++)
			{
				if ((possition_array[i, 0] == "X") & (possition_array[i, 1] == "X") & (possition_array[i, 2] == "X"))
				{
					End("X", possition_array);
				}
				else if ((possition_array[i, 0] == "O") & (possition_array[i, 1] == "O") & (possition_array[i, 2] == "O"))
				{
					End("O", possition_array);
				}
				else if ((possition_array[0, i] == "X") & (possition_array[1, i] == "X") & (possition_array[2, i] == "X"))
				{
					End("X", possition_array);
				}
				else if ((possition_array[0, i] == "O") & (possition_array[1, i] == "O") & (possition_array[2, i] == "O"))
				{
					End("O", possition_array);
				}
				else if ((possition_array[0, 0] == "X") & (possition_array[1, 1] == "X") & (possition_array[2, 2] == "X"))
				{
					End("X", possition_array);
				}
				else if ((possition_array[0, 0] == "O") & (possition_array[1, 1] == "O") & (possition_array[2, 2] == "O"))
				{
					End("O", possition_array);
				}
				else
				{
					continue;
				}
			}
		}

		static void Player_change(int x, string[,] possition_array)
		{
			if(x == 1)
			{
				Play(0, possition_array);
			}
			else
			{
				Play(1, possition_array);
			}
		}

		static void Draw_board(string[,] possition_array)
		{
			for (int i = 0; i < 3; i++)
			{
				Console.WriteLine($"{possition_array[i, 0]} {possition_array[i, 1]} {possition_array[i, 2]}");
			}
		}

		static void End(string Victor, string[,] possition_array)
		{
			Draw_board(possition_array);
			if (Victor == "X")
			{
				Console.WriteLine("Crosses won!");
			}
			else
			{
				Console.WriteLine("Circles won!");
			}
			Console.WriteLine("Well Played. Please press Enter to quit.");
			Console.ReadLine();
		}
	}
}