import java.awt.*;
import java.awt.event.*;

/**********************************************/
/*USING 'X' FOR HUMAN  AND '0' FOR COMPUTER*/
/**********************************************/
public class TicTacMine extends java.applet.Applet implements ActionListener
  {
  static Button squares[],nGameB;
  static Label label,aboutL;
  static int squaresRemaining=9;
  static String forAbout="",difLevel="";

  public void init()
    {
    setSize(500,500);
    setLayout(new BorderLayout());
    setFont(new Font("TimesRoman",Font.BOLD,30));
    Panel p1=new Panel();
    p1.setLayout(new GridLayout(3,3));
    add(p1,BorderLayout.CENTER);
    label=new Label("TIC TAC TOW",1);
    label.setBackground(Color.black);
    label.setForeground(Color.white);
    add(label,BorderLayout.SOUTH);
    Panel p2=new Panel();
    p2.setLayout(new FlowLayout());
    p2.setBackground(Color.black);
    
    //		NEW GAME BUTTON
    nGameB=new Button("New Game");
    nGameB.setBackground(Color.black);
    nGameB.setForeground(Color.white);
    nGameB.addActionListener(new ActionListener()
      {
      public void actionPerformed(ActionEvent e)
        {
        for(int i=0;i<9;i++)
          {
          squares[i].setEnabled(true);
          squares[i].setLabel("");
          squares[i].setBackground(new Color(78,196,235));
          }
        squaresRemaining=9;
        label.setText("TIC TAC TOE");
        label.setAlignment(1);
        nGameB.setEnabled(false);
        }
      }
    );
    p2.add(nGameB);

    //		ABOUT
    aboutL=new Label("About");
    aboutL.setBackground(Color.black);
    aboutL.setForeground(Color.white);
    aboutL.addMouseListener(new MouseAdapter()
      {
      public void mouseEntered(MouseEvent e)
        {
        forAbout=label.getText();
        aboutL.setForeground(Color.red);
        label.setText("ITIS 2230 White Box");
        label.setAlignment(1);
        }
      }
    );
    aboutL.addMouseListener(new MouseAdapter()
      {
      public void mouseExited(MouseEvent e)
        {
        aboutL.setForeground(Color.white);
        label.setText(forAbout);
        label.setAlignment(1);
        }
      }
    );
    p2.add(aboutL);
    add(p2,BorderLayout.NORTH);
    squares=new Button[9];
    for(int i=0;i<9;i++)
      {
      squares[i]=new Button();
      squares[i].addActionListener(this);
      squares[i].setBackground(new Color(98,156,245));
      p1.add(squares[i]);
      }
    nGameB.setEnabled(false);
    }//end init

  public void actionPerformed(ActionEvent e)
    {
    for ( int i=0; i<9; i++ )
      {
      if ( e.getSource() == squares[i] )
        {
        if ( squares[i].getLabel().equals("X") ||
             squares[i].getLabel().equals("O") )
          {
          return;
          }
        squares[i].setLabel("X");
        squaresRemaining--;
        String winner = "";
        winner = checkForWin();
        if ( winner.equals("X") ||
             winner.equals("O") )
          {
          endGame();
          }
        else
          {
          if ( squaresRemaining <= 0 )
            {
            endGame();
            }
          else
            { //	for animation
            try
              {
              Thread.sleep(100);
              }
            catch(InterruptedException w){}
            computerMove();
            squaresRemaining--;
            winner = checkForWin();
            if ( winner.equals("X") ||
                 winner.equals("O") // if 
                || squaresRemaining <= 0 )   // or if tie
              {
              endGame();
              }
            }
          }
        }
      }
    } // end actionPerformed

  String checkForWin() 
    {
    String theWinner = "";
    if ( squares[0].getLabel().equals(squares[1].getLabel()) &&
         squares[0].getLabel().equals(squares[2].getLabel()) &&
         ! squares[0].getLabel().equals("") ) 
      {
      theWinner = squares[0].getLabel();
      colorLine(0,1,2,theWinner);
      }
    else if ( squares[3].getLabel().equals(squares[4].getLabel()) &&
              squares[3].getLabel().equals(squares[5].getLabel()) &&
              ! squares[3].getLabel().equals("") )
      {
      theWinner = squares[3].getLabel();
      colorLine(3,4,5,theWinner);
      }
    else if ( squares[6].getLabel().equals(squares[7].getLabel()) &&
             squares[6].getLabel().equals(squares[8].getLabel()) &&
             ! squares[6].getLabel().equals("") )
      {
      theWinner = squares[6].getLabel();
      colorLine(6,7,8,theWinner);
      }
    else if ( squares[0].getLabel().equals(squares[3].getLabel()) &&
             squares[0].getLabel().equals(squares[6].getLabel()) &&
             ! squares[0].getLabel().equals("") )
      {
      theWinner = squares[0].getLabel();
      colorLine(0,3,6,theWinner);
      }
    else if ( squares[1].getLabel().equals(squares[4].getLabel()) &&
             squares[1].getLabel().equals(squares[7].getLabel()) &&
             ! squares[1].getLabel().equals("") )
      {
      theWinner = squares[1].getLabel();
      colorLine(1,4,7,theWinner);
      }
    else if ( squares[2].getLabel().equals(squares[5].getLabel()) &&
             squares[2].getLabel().equals(squares[8].getLabel()) &&
             ! squares[2].getLabel().equals("") )
      {
      theWinner = squares[2].getLabel();
      colorLine(2,5,8,theWinner);
      }
    else if ( squares[0].getLabel().equals(squares[4].getLabel()) &&
             squares[0].getLabel().equals(squares[8].getLabel()) &&
             ! squares[0].getLabel().equals("") )
      {
      theWinner = squares[0].getLabel();
      colorLine(0,4,8,theWinner);
      }
    else if ( squares[2].getLabel().equals(squares[4].getLabel()) &&
             squares[2].getLabel().equals(squares[6].getLabel()) &&
             ! squares[2].getLabel().equals("") )
      {
      theWinner = squares[2].getLabel();
      colorLine(2,4,6,theWinner);
      }
    return theWinner;
    }

  void computerMove()
    {
    int pickedSquare;
    pickedSquare = tryToWin();
    if ( pickedSquare == -1 )
      pickedSquare = makeBlock();
    if ( (pickedSquare == -1)&&(squares[4].getLabel().equals("")) )
      pickedSquare=4;
    if ( pickedSquare == -1 )
      pickedSquare = pickRandom();
    squares[pickedSquare].setLabel("O");
    return;
    }

  int tryToWin() 
    { // Since computer plays "O", find empty square that is in line with 
    return EmptySquare("O");
    }

  int makeBlock()
    { // Since human plays "X", find  empty square that is in line with 
    return EmptySquare("X");
    }

  int EmptySquare(String player)
    {
    int a[] = new int[9];
    for ( int i = 0; i < 9; i++ )
      {
      if ( squares[i].getLabel().equals("O") )
        a[i] = -1;
      else if ( squares[i].getLabel().equals("X") )
        a[i] = 1;
      else
        a[i] = 0;
      }
    int sum = player.equals("O") ? -2 : 2;
    // Top Row
    if ( a[0] + a[1] + a[2] == sum )
      {
      if ( a[0] == 0 )
        return 0;
      else if ( a[1] == 0 )
        return 1;
      else
        return 2;
      }
    // Middle Row
    if ( a[3] +a[4] + a[5] == sum )
      {
      if ( a[3] == 0 )
        return 3;
      else if ( a[4] == 0 )
        return 4;
      else
        return 5;
      }
    // Bottom Row
    if ( a[6] + a[7] +a[8] == sum )
      {
      if ( a[6] == 0 )
        return 6;
      else if ( a[7] == 0 )
        return 7;
      else
        return 8;
      }
    // Left column
    if ( a[0] + a[3] + a[6] == sum )
      {
      if ( a[0] == 0 )
        return 0;
      else if ( a[3] == 0 )
        return 3;
      else
        return 6;
      }
    // Middle column
    if ( a[1] +a[4] + a[7] == sum )
      {
      if ( a[1] == 0 )
        return 1;
      else if ( a[4] == 0 )
        return 4;
      else
        return 7;
      }
    // right column
    if ( a[2] + a[5] + a[8] == sum )
      {
      if ( a[2] == 0 )
        return 2;
      else if ( a[5] == 0 )
        return 5;
      else
        return 8;
      }
    // diagonal upper-left to lower-right
    if ( a[0] + a[4] + a[8] == sum )
      {
      if ( a[0] == 0 )
        return 0;
      else if ( a[4] == 0 )
        return 4;
      else
        return 8;
      }
    // diagonal upper-right to lower-left
    if ( a[2] + a[4] + a[6] == sum )
      {
      if ( a[2] == 0 )
        return 2;
      else if ( a[4] == 0 )
        return 4;
      else
        return 6;
      }
    // not able to find
    return -1;
    }

  int pickRandom()
    {
    boolean found = false;
    int pickedSquare = -1;
    do
      {
      pickedSquare = (int) (Math.random() * 8 );  // 0 to 8
      if ( ! squares[pickedSquare].getLabel().equals("X") &&
           ! squares[pickedSquare].getLabel().equals("O") )
        {
        found = true;
        }
      }
    while ( ! found );
    // comment this out after routine is tested
    label.setText("Debug - Random pick:"+pickedSquare);
    return pickedSquare;
    } // end pickRandom()

  void colorLine(int a, int b, int c,String win)
    {
      // mark line red if user (X) wins
      // mark line blue if computer (O) wins
      if ( win.equals("X") )
        {
        squares[a].setBackground(Color.black);
        squares[b].setBackground(Color.darkGray);
        squares[c].setBackground(Color.black);
        label.setText("HEWMAN WINS");
        label.setForeground(Color.white);
        label.setAlignment(1);
        }
      else
        {
        squares[a].setBackground(Color.black);
        squares[b].setBackground(Color.darkGray);
        squares[c].setBackground(Color.black);
	label.setText("          COMPEWTER WINS");
        label.setForeground(Color.white);
        label.setAlignment(1);
        }
      }

  void endGame()
    {
    for(int i=0;i<9;i++)
      squares[i].setEnabled(false);
    nGameB.setEnabled(true);
    }

  }//end class