#include <iostream>
#include <string>

using namespace std;

int  player;
char board[9] = {'1', '2', '3', '4', '5', '6', '7', '8', '9'};
void gameboard();
void takeTurns(bool, int);
void move(int);
bool playAgain = 0;
bool replay();
bool winCheck();
bool moveCheck(int);

string player1 = "Player 1";
string player2 = "Player 2";


int main()
{

    char stop;
    player = 1;

    do {
        cout << "Enter name for Player 1 \n";
        cin >> player1;
        cout << "Enter name for Player 2 \n";
        cin >> player2;
        gameboard();
        takeTurns(winCheck(), player);
        playAgain = replay();
    } while (playAgain);

    cout << endl << "Type any key and press enter to exit" << endl;
    cin >> stop;
    return 0;
}

bool replay()
{
    char playAgain;

    cout << "Do you want to play again? (y/n)" << endl;
    cin >> playAgain;

    if (playAgain == 'y')
        return true;
    else
        return false;
}


void takeTurns(bool winCheck(), int player)
{
    if (winCheck()){
        if (player == 0)
            cout << endl << player1 << " has WON!\n";
        else
            cout << endl << player2 << " has WON!\n";
    }

    if (!winCheck()){
        if (player == 1)
            player = 0;
        else
            player = 1;
    }

        move(player);
}

void gameboard()
{
    cout << "\n\t" << board[0] << " | " << board[1] << " | " << board[2] << "\n";
    cout << "\t" << "--------- \n";
    cout << "\t" << board[3] << " | " << board[4] << " | " << board[5] << "\n";
    cout << "\t" << "--------- \n";
    cout << "\t" << board[6] << " | " << board[7] << " | " << board[8] << endl << endl;
 }

bool winCheck()
{
     if ( board[0] == board[1] && board[2] == board[0])
        return true;
     if ( board[3] == board[4] && board[5] == board[3])
        return true;
     if ( board[6] == board[7] && board[8] == board[6])
        return true;
     if ( board[0] == board[3] && board[6] == board[0])
        return true;
     if ( board[1] == board[4] && board[7] == board[1])
        return true;
     if ( board[2] == board[5] && board[8] == board[2])
        return true;
     if ( board[0] == board[4] && board[8] == board[0])
        return true;
     if ( board[6] == board[4] && board[2] == board[6])
        return true;
     else
        return false;
}

void move(int player)
{
     int box;

     if ( player == 0 )
        cout << "\nEnter your move " << player1 << endl;
     else
        cout << "\nEnter your move " << player2 << endl;
     cin >> box;
     if ( moveCheck(box) )
     {
        if (player == 0)
            board[box-1] = 'X';
        else
            board[box-1] = 'O';
     }
}

bool moveCheck(int box)
{
     if ( board[box-1] == 'X' || board[box-1] == 'O' )
     {
         cout << "You can't choose a spot that has already been taken.\n";
         return false;
     }
     if ( box > 9)
     {
         cout << "Please enter a number on the board.\n";
         return false;
     }
     else
         return true;
}