#include <iostream>
using namespace std;

char board[3][3] = { {'1', '2', '3'}, {'4', '5', '6'}, {'7', '8', '9'} }; //stores the values on the board.
char turn = 'X'; //determines whether it is "X"'s turn or "O"'s turn.
int choice; //used for user input.
int fullCheck = 0; //checks how many spaces are filled on the board. When this value is equal to 9, the board is full, so the program announces a tie and terminates the program.
bool isOver = false; //a boolean for whether the game is over or not. Once this value is true, the program terminates.

void switchTurn()
{
	if (turn == 'X')
	{
		turn = 'O';
	}
	else
	{
		turn = 'X';
	}
}
void drawBoard()
{

	for (int horizontal = 0; horizontal < 3; ++horizontal)
	{
		cout << "|";
		for (int vertical = 0; vertical < 3; ++vertical)
		{
			cout << board[horizontal][vertical] << "|";
		}
		if (horizontal < 2)
		{
			cout << "\n|-+-+-|\n";
		}
	}

}
void translateChoice()
{
	int rowPick = 0;
	int columnPick = 0;
	choice -= 1;
	while (choice > 2)
	{
		rowPick += 1;
		choice -= 3;
	}
	columnPick = choice;
	if (board[rowPick][columnPick] != 'X' && board[rowPick][columnPick] != 'O' && rowPick <= 2)
	{
		board[rowPick][columnPick] = turn;
		switchTurn();
		fullCheck += 1;
	}
	else
	{
		cout << "Sorry, that square is taken. Try again";
	}
}
void winProcedure()
{
	switchTurn();
	drawBoard();
	cout << "\n\nyou win, " << turn << "!!\n\n";
	isOver = true;
}
void winCheck()
{
	if ((board[0][0] == board[1][1] && board[1][1] == board[2][2]) || (board[2][0] == board[1][1] && board[1][1] == board[0][2]))
	{
		winProcedure();
	}
	for (int i = 0; i < 3; ++i)
	{
		if ((board[i][0] == board[i][1] && board[i][1] == board[i][2]) || (board[0][i] == board[1][i] && board[1][i] == board[2][i]))
		{
			winProcedure();
		}
	}
}
int main()
{
	cout << "Welcome to Tic Tac Toe!\n\n";
	while (isOver == false)
	{
		drawBoard();
		cout << "\n\nPick your square, " << turn << "\n\nChoice: ";
		cin >> choice;
		system("CLS");
		translateChoice();
		cout << "\n\n";
		winCheck();
		if (fullCheck == 9 && isOver == false)
		{
			cout << "It's a tie!\n\n";
			isOver = true;
		}
	}
}