var PADDLE_WIDTH = 80;
var PADDLE_HEIGHT = 15;
var PADDLE_OFFSET = 10;

var BALL_RADIUS = 15;

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;

var paddle, ball;
var vx;
var vy = 8;
var gameOver = false;
var NUM_TURNS = 3;
var turnsLeft = NUM_TURNS;
var bricksLeft = NUM_ROWS * NUM_BRICKS_PER_ROW;

function setupBall(){
    ball = new Circle(BALL_RADIUS);
    ball.setPosition(getWidth()/2, getHeight()/2);
    add(ball);
}

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

function getColorForRow(rowNum){
    rowNum = rowNum % 8;
    if(rowNum <= 1){
        return Color.red;
    }else if(rowNum > 1 && rowNum <= 3){
        return Color.orange;
    }else if(rowNum > 3 && rowNum <= 5){
        return Color.green;
    }else{
        return Color.blue;
    }
}

function drawBrick(x, y, color){
    var brick = new Rectangle(BRICK_WIDTH, BRICK_HEIGHT);
    brick.setPosition(x, y);
    brick.setColor(color);
    add(brick);
}

function drawRow(rowNum, yPos){
    var xPos = BRICK_SPACING;
    for(var i = 0; i < NUM_BRICKS_PER_ROW; i++){
        drawBrick(xPos, yPos, getColorForRow(rowNum));
        xPos += BRICK_WIDTH + BRICK_SPACING;
    }
}

function drawBricks(){
    var yPos = BRICK_TOP_OFFSET;
    for(var i = 0; i < NUM_ROWS; i++){
        drawRow(i, yPos);
        yPos += BRICK_HEIGHT + BRICK_SPACING;
    }
}

function setSpeeds(){
    vx = Randomizer.nextInt(2, 7);
    if(Randomizer.nextBoolean()){
        vx = -vx;
    }
}

function setup(){
    drawBricks();
    setupPaddle();
    setupBall();
    setSpeeds();
}

function checkWalls(){
    if(ball.getX() - ball.getRadius() < 0 || ball.getX() + ball.getRadius() > getWidth()){
        vx = -vx;
    }

    if(ball.getY() - ball.getRadius() < 0){
        vy = -vy;
    }

    if(ball.getY() + ball.getRadius() > getHeight()){
        gameOver = true;
    }
}

function getCollidingObject(){
    var left = ball.getX() + ball.getRadius();
    var right = ball.getX() + ball.getRadius();

    var top = ball.getY() - ball.getRadius();
    var bottom = ball.getY() + ball.getRadius();

    var topLeft = getElementAt(left, top);
    if(topLeft){
        return topLeft;
    }

    var topRight = getElementAt(right, top);
    if(topRight){
        return topRight;
    }

    var bottomLeft = getElementAt(left, bottom);
    if(bottomLeft){
        return bottomLeft;
    }

    var bottomRight = getElementAt(left, bottom);
    if(bottomRight){
        return bottomRight;
    }
}

function checkObjects(){
    var elem = getCollidingObject();
    if(elem != null){
        if(elem != paddle){
            remove(elem);
            vy = -vy;
            bricksLeft--;
        }else{
            vy = -Math.abs(vy);
        }
    }
}

function drawGameOver(){
    var text = new Text("Game over", "25pt Arial");
    text.setPosition(getWidth()/2 - text.getWidth()/2, getHeight()/2);
    add(text);
}

function drawGameWon(){
    var text = new Text("You Win!", "25pt Arial");
    text.setPosition(getWidth()/2 - text.getWidth()/2, getHeight()/2);
    add(text);
}

function checkWin(){
    if(bricksLeft== 0){
        stopTimer(draw);
        drawGameWon();
    }
}

function checkLose(){
    if(gameOver){
        turnsLeft--;
        remove(ball);
        if(turnsLeft == 0){
            stopTimer(draw);
            drawGameOver();
        }
        else{
            stopTimer(draw);
            waitForClick();
            setTimer(draw, 40);
            setupBall();
            setSpeeds();
            gameOver = false;
        }
    }
}

function draw(){
    checkWalls();
    checkObjects();
    ball.move(vx, vy);
    checkWin();
    checkLose();
}

function myMove(event){
    var x = event.getX() - paddle.getWidth()/2;
    if(x < 0){
        x = 0;
    }
    if(x + paddle.getWidth() > getWidth()){
        x = getWidth() - paddle.getWidth();
    }
    paddle.setPosition(x, paddle.getY());
}

function start(){
    setup();
    //waitForClick();
    setTimer(draw, 40);
    mouseMoveMethod(myMove);
}