import java.io.*;

/**
   Connect4.java
 
   Written by: Stuart Hansen
   Date: August 30, 2003

   Purpose:
      This file contains a program that plays the game Connect 4.
*/
public class Connect4
{

    /** This method prints who has won the game */
    public static void printResult (Position pp)
    {
       if (pp.getWinner() == ComputerPlayer.COMPUTER_CHARACTER)
	  System.out.println("Computer wins big time!!");
       else if (pp.getWinner() == HumanPlayer.HUMAN_CHARACTER)
	  System.out.println("You got lucky and won this time!!");
       else
	  System.out.println("The game was a draw!");
    }

    /** The main program drives the game */
    public static void main (String [] args) throws Exception
    {
        Position p = new Position();
        p.print();

        HumanPlayer human = new HumanPlayer();

        char user_first;    /* flag to see who goes first */
        int strength;

        /* See how strong of game the user want to play */
        if (args.length > 0)
        {
            strength = Integer.parseInt(args[0]);
            if (strength < 1) strength = 1;
        }
        else
            strength = 5;

        ComputerPlayer computer = new ComputerPlayer(strength);

        /* Check to see who plays first */
        System.out.print("Do you want to go first (Y or N) -->");
        BufferedReader bufReader = new BufferedReader(new InputStreamReader(System.in));
        String line = bufReader.readLine();

        user_first = line.charAt(0);

        if (user_first == 'Y' || user_first == 'y')
        {
            p=human.move(p);
            p.print();
        }

        /* Continue playing until the game is over */
        while (!p.gameOver())
        {
             p = computer.move(p);
             p.print();

             if (!p.gameOver())
             {
                 p=human.move(p);
                 p.print();
             }
        }
        printResult(p);
    }
}