/* FILE NAME: Balloon.java
 * AUTHOR: ??
 * DATE: ??
 * COMMENTS: Builds an animation of balloons moving up and down in a given space.
 * 
 * MODIFICATION HISTORY: Stella, Nov 07
 * Added "stuck" instance var, and re-wrote the updateState() 
*/

import java.awt.*;

class Balloon extends Sprite { 
     private int x; //the x-coordinate of the center of this ballon
     private int y; //the y-coordinate of the center of this ballon
     private int radius;
     private Color color;
     private boolean up;    // true if balloon is going up
     private int d;         // move increment
     private int timeStuck; // how long (number of frames) 
                            //the balloon will be stuck at the ceiling
 
     // add any other instance variable(s) that you need here:
     private int stuckCounter; //for how many *more* frames the ballon 
     //will be stuck at the ceiling. Starts out the same as "timeStuck",
     //and gets reduced by 1 after every frame.
     private boolean stuck; //stuck on the ceiling

    public Balloon(int x, int radius, Color color, int d, int timeStuck) {       
        this.x = x;
        this.y = height - radius;  //the ballon will start resting on the floor
        this.radius = radius;
        this.color = color;
        this.stuckCounter = this.timeStuck = timeStuck;
        this.d = d;
        this.up = true;
        this.stuck = false; 
    }

    public void drawState(Graphics g) { 
        g.setColor(color);
        g.fillOval(x - radius, y - radius, 2*radius, 2*radius);
        // adding a word on each balloon in white
        g.setColor(Color.red);
        Font myfont = new Font("Chalkboard", Font.BOLD, 14);
        g.setFont(myfont);
        g.drawString("Hi",x-3,y);
        g.setColor(color);
    }

        public void updateState() {
          //Balloon is going up
          if (up) { 
            y = y - d; //try to move it up by d
            if (y < radius) { //check to see whether this would move the balloon
              //too far to the North.
              y = radius; //in that case, just stick it to the ceiling
            }
            //at some point, the balloon will get stuck to the ceiling
            if (y == radius) { 
              up = false;
              stuck = true;
            }
          }
            
          //Balloon is stuck to the ceiling
          if (stuck) {
            if (stuckCounter > 0) //it should still stay stuck
              stuckCounter = stuckCounter - 1;
            else //it should start coming down
            stuck = false;
          }
          
          //Ballon is on its way down
          if (!up && !stuck) {
            y = y + d; //try to move it down by d
            if (y > height-radius) // that would move the ballon too far to the South
              y = height - radius; //correct the y, so the balloon rests on the floor
          }
        }
            
    // resetState() is invoked to put the sprite into the initial position
    public void resetState()
    {
        y = height - radius; //place the ballon so it rests on the floor.
        up = true; //ready to go up
        stuck = false;
        stuckCounter = timeStuck; 
    } 
 
    // For debugging:
    public String className() {
        return "Balloon";
    }
    
    public String toString() {
        return className() + "["
            + "x=" + x
            + "; y=" + y
            + "; radius=" + radius
            + "; color=" + color
            + "; up=" + up
            + "; d=" + d
            + "; timeStuck=" + timeStuck
            + "]";
    }
} // class Balloon