import java.util.Random;
import edu.neu.world.*;

/**
 * A class to represent a dice player in a universe
 * After being connected, on receiving message "roll"
 * the user hits a space bar to roll again.
 * 
 * @author Viera K. Proulx
 * @since 9 April 2010
 */
@WorldSettings(height=200,width=100,tick=5,title="MyWorld")
public class Dice extends edu.neu.universe.World<String>{
  /** silly toggle to flip color on every tick */  
  boolean even = true;
  
  /** are we ready to roll again? */
  boolean ready = false;
  
  /** the current roll of the die to display and send to universe */
  int current = 0;
  
  /** 
   * The required public default constructor
   */
  public Dice(){}
  
  /**
   * Connect to the server when the world starts
   */
  public void onInit(){
    this.connect("192.168.1.2", 7070, "Dice client");
  }
  
  /**
   * On connection tell the universe you are ready to play
   */
  public void onConnect(){
    sendMessage(randomRoll());
  }
  
  /**
   * Print a message indicating we have been disconnected
   */
  public void onDisconnect(){
    System.out.println("We have been disconnected.");
  }
  
  /**
   * Allow the user to roll again 
   * when told to do so
   * Disconnect if told to stop
   * Ignore any other messages
   * @param s the message received
   */
  public void onReceive(String s){
    if (s.equals("roll")){
      this.ready = true;
    }
    else if(s.equals("deuce")){
      this.current = 1000;
    }      
    else if (s.equals("stop")){
      disconnect();
    }
  }
  
  /**
   * Hit the space bar to roll again
   * and disable roll until the next message comes
   * from the universe
   */
  public void onKeyEvent(IWorld.Key ke, int mode){
    if (ke.equals(IWorld.Key.SPACE) && this.ready 
        && mode == KEY_PRESSED){
      this.current = randomRoll();
      sendMessage("" + this.current);
      this.ready = false;
    }
  }
  
  /**
   * Change the color of the dot on each tick
   */
  public void onTick(){
    this.even = !this.even;
  }
  
  /**
   * Fill a red rectangle 50 by 100 in the top left corner
   * on the world canvas,  
   * Display the last number rolled, (or 1000 if deuce)
   * Show a flashing dot - changing the color on each tick
   * @param c the world canvas
   */
  public void onDraw(edu.neu.world.desktop.Canvas c){
    c.fillRect(0, 0, 50, 100, edu.neu.world.Color.RED);
    c.drawString("" + this.current, 20, 20, 12);
    if (this.even)
      c.fillCircle(25, 50, 5, edu.neu.world.Color.BLUE);
    else
      c.fillCircle(25, 50, 5, edu.neu.world.Color.YELLOW);
  }
  
  /** 
   * A helper method to generate a random number 
   * in the range 0 to n 
   */
  int randomRoll(){
    return new Random().nextInt(6) + 1;
  }
   
}