#include <iostream.h>
#include <stdlib.h> //needed for rand
#include <windows.h>

void draw_board();
void player_movement();
void computer_movement();

char board_info[9] = {'1','2','3',
                      '4','5','6',
                      '7','8','9'};

int main()
{
   srand(GetTickCount());   //sets randomizer as time *unique*
   
   draw_board();
   
   for (int i = 0; i < 9 ; i++)
   {
   board_info[i] = ' ';
   }

   draw_board();

   player_movement();

   draw_board();
   
   computer_movement();
   
   draw_board();   
   
   system("PAUSE");
   return 0;
}

void draw_board()
{
   cout << endl;  
   cout << " -------------" <<endl;
   cout << " | " << board_info[0] << " | " << board_info[1] << " | " << board_info[2] << endl;
   cout << " -------------" <<endl;
   cout << " | " << board_info[3] << " | " << board_info[4] << " | " << board_info[5] << endl;
   cout << " -------------" <<endl;
   cout << " | " << board_info[6] << " | " << board_info[7] << " | " << board_info[8] << endl;
   cout << " -------------" <<endl;
}

void player_movement()
{
   int choice;
   cout << "\nPlease select a number from 1 - 9: ";
   cin >> choice;

   //Error Checking
   
   if (cin.fail())
   {
   cout << "Error!";
   exit(1);
   }
   
   while (choice >= 10 || choice <=0)
   {
      cout << "\nPlease select again: ";
      cin >> choice;
   }
 
   while (board_info[(choice-1)] != ' ')
   {
      cout << "\nPlease select again: ";
      cin >> choice;
   };
   
   board_info[choice-1] = 'X';
}

void computer_movement()
{
   if ((int(board_info[0]) + int(board_info[1]) + int(board_info[2])) == (2*int(char('X')))+int(char(' ')))
   {
      if (board_info[0] == ' ') board_info[0] = 'O';
      else if (board_info[1] == ' ') board_info[1] = 'O';
      else if (board_info[2] == ' ') board_info[2] = 'O';      
   }

   else if ((int(board_info[3]) + int(board_info[4]) + int(board_info[5])) == (2*int(char('X')))+int(char(' ')))
   {
      if (board_info[3] == ' ') board_info[3] = 'O';
      else if (board_info[4] == ' ') board_info[4] = 'O';
      else if (board_info[5] == ' ') board_info[5] = 'O';      
   }

   else if ((int(board_info[6]) + int(board_info[7]) + int(board_info[8])) == (2*int(char('X')))+int(char(' ')))
   {
      if (board_info[6] == ' ') board_info[6] = 'O';
      else if (board_info[7] == ' ') board_info[7] = 'O';
      else if (board_info[8] == ' ') board_info[8] = 'O';      
   }

   else if ((int(board_info[0]) + int(board_info[3]) + int(board_info[6])) == (2*int(char('X')))+int(char(' ')))
   {
      if (board_info[0] == ' ') board_info[0] = 'O';
      else if (board_info[3] == ' ') board_info[3] = 'O';
      else if (board_info[6] == ' ') board_info[6] = 'O';      
   }

   else if ((int(board_info[1]) + int(board_info[4]) + int(board_info[7])) == (2*int(char('X')))+int(char(' ')))
   {
      if (board_info[1] == ' ') board_info[1] = 'O';
      else if (board_info[4] == ' ') board_info[4] = 'O';
      else if (board_info[7] == ' ') board_info[7] = 'O';      
   }

   else if ((int(board_info[2]) + int(board_info[5]) + int(board_info[8])) == (2*int(char('X')))+int(char(' ')))
   {
      if (board_info[2] == ' ') board_info[2] = 'O';
      else if (board_info[5] == ' ') board_info[5] = 'O';
      else if (board_info[8] == ' ') board_info[8] = 'O';      
   }      

   else if ((int(board_info[0]) + int(board_info[4]) + int(board_info[8])) == (2*int(char('X')))+int(char(' ')))
   {
      if (board_info[0] == ' ') board_info[0] = 'O';
      else if (board_info[4] == ' ') board_info[4] = 'O';
      else if (board_info[8] == ' ') board_info[8] = 'O';      
   }

   else if ((int(board_info[2]) + int(board_info[4]) + int(board_info[6])) == (2*int(char('X')))+int(char(' ')))
   {
      if (board_info[2] == ' ') board_info[2] = 'O';
      else if (board_info[4] == ' ') board_info[4] = 'O';
      else if (board_info[6] == ' ') board_info[6] = 'O';      
   }
   else
   
   {
   int number = rand()%9; 
   while (board_info[number] != ' ') number = rand()%9;
   board_info[number] = 'O';
   }
}