/* Constants for bricks */
var NUM_ROWS = 8;
var BRICK_TOP_OFFSET = 10;
var BRICK_SPACING = 2;
var NUM_BRICKS_PER_ROW = 10;
var BRICK_HEIGHT = 10;
var SPACE_FOR_BRICKS = getWidth() - (NUM_BRICKS_PER_ROW + 1) * BRICK_SPACING;
var BRICK_WIDTH = SPACE_FOR_BRICKS / NUM_BRICKS_PER_ROW;

/* Constants for ball and paddle */
var paddle;
var PADDLE_WIDTH = 80;
var PADDLE_HEIGHT = 15;
var PADDLE_OFFSET = 10;

var ball;
var BALL_RADIUS = 15;
var dx,
    dy = 5;

function start(){
    if (Randomizer.nextBoolean() === true) {
        dx = -5;
    } else {dx = 5;}

	drawBricks();
	drawPaddle();
	drawBall();

	setTimer(game, 25);

	mouseMoveMethod(paddleMovement);
}

function game() {
    ballMovement();
    ballCollision();
}

function ballMovement() {
    ball.move(dx,dy);
}

function ballCollision() {
    if (ball.getY()+BALL_RADIUS > getHeight()) {
        dy = -dy;
    } else if (ball.getY()-BALL_RADIUS < 0) {
        dy = -dy;
    } else if (ball.getX()+BALL_RADIUS > getWidth()) {
        dx = -dx;
    } else if (ball.getX()-BALL_RADIUS < 0) {
        dx = -dx;
    }

}

function paddleMovement(m) {
    if (m.getX()-PADDLE_WIDTH/2 < 0 || m.getX()+PADDLE_WIDTH/2 > getWidth()) {}
    else {
        paddle.setPosition(m.getX()-PADDLE_WIDTH/2,paddle.getY());
    }
}

function drawBall() {
    ball = new Circle(BALL_RADIUS);
    ball.setColor(Color.black);
    ball.setPosition(getWidth()/2,getHeight()/2);
    add(ball);
}

function drawPaddle() {
    paddle = new Rectangle(PADDLE_WIDTH,PADDLE_HEIGHT);
    paddle.setColor(Color.black);
    paddle.setPosition(getWidth()/2-PADDLE_WIDTH/2,getHeight()-PADDLE_HEIGHT-PADDLE_OFFSET);
    add(paddle);
}

function drawBricks() {
    var posy = BRICK_TOP_OFFSET;
    var color = Color.red;
    var x = 0;
    for (var i = 0; i < NUM_ROWS; i++) {
        if (x==0||x==1) {
            color=Color.red;
            x++;
        } else if (x==2||x==3) {
            color=Color.orange;
            x++;
        } else if (x==4||x==5) {
            color=Color.green
            x++;
        } else if (x==6||x==7) {
            color=Color.blue;
            x++;
        } else {
            color=Color.red;
            x = 0;
        }
        println(x);
        for (var j = 0; j < NUM_BRICKS_PER_ROW; j++) {
            var brick = new Rectangle(BRICK_WIDTH,BRICK_HEIGHT);
            brick.setPosition(BRICK_SPACING+BRICK_SPACING*j+BRICK_WIDTH*j,posy);
            brick.setColor(color);
            add(brick);
        }
        posy = posy+BRICK_HEIGHT+BRICK_SPACING;
    }
}