text: const Engine = Matter.Engine;
  const World = Matter.World;
  const Bodies = Matter.Bodies;
  const Constraint = Matter.Constraint;
  
  var engine, world, backgroundImg;
  var canvas, angle, tower, ground, cannon;
  var balls = [];
  var boats = [];
  var score = 0;
  var boatAnimation = [];
  var boatSpritedata, boatSpritesheet;
  
  var brokenBoatAnimation = [];
  var brokenBoatSpritedata, brokenBoatSpritesheet;
  
  var waterSplashAnimation = [];
  var waterSplashSpritedata, waterSplashSpritesheet;
  var isGameOver=false;
  
  
  
  function preload() {
    backgroundImg = loadImage("./assets/background.gif");
    towerImage = loadImage("./assets/tower.png");
    boatSpritedata = loadJSON("assets/boat/boat.json");
    boatSpritesheet = loadImage("assets/boat/boat.png");
    brokenBoatSpritedata = loadJSON("assets/boat/brokenBoat.json");
    brokenBoatSpritesheet = loadImage("assets/boat/brokenBoat.png");
    waterSplashSpritedata = loadJSON("assets/waterSplash/waterSplash.json");
    waterSplashSpritesheet = loadImage("assets/waterSplash/waterSplash.png");
  }
  
  function setup() {
    canvas = createCanvas(1200, 600);
    engine = Engine.create();
    world = engine.world;
    angleMode(DEGREES)
    angle = 15
  
  
    ground = Bodies.rectangle(0, height - 1, width * 2, 1, { isStatic: true });
    World.add(world, ground);
  
    tower = Bodies.rectangle(160, 350, 160, 310, { isStatic: true });
    World.add(world, tower);
  
    cannon = new Cannon(180, 110, 130, 100, angle);
  
    var boatFrames = boatSpritedata.frames;
    for (var i = 0; i < boatFrames.length; i++) {
      var pos = boatFrames[i].position;
      var img = boatSpritesheet.get(pos.x, pos.y, pos.w, pos.h);
      boatAnimation.push(img);
    }
  
    var brokenBoatFrames = brokenBoatSpritedata.frames;
    for (var i = 0; i < brokenBoatFrames.length; i++) {
      var pos = brokenBoatFrames[i].position;
      var img = brokenBoatSpritesheet.get(pos.x, pos.y, pos.w, pos.h);
      brokenBoatAnimation.push(img);
    }
  
    var waterSplashFrames = waterSplashSpritedata.frames;
    for (var i = 0; i < waterSplashFrames.length; i++) {
      var pos = waterSplashFrames[i].position;
      var img = waterSplashSpritesheet.get(pos.x, pos.y, pos.w, pos.h);
      waterSplashAnimation.push(img);
    }
  }
  
  function draw() {
    background(189);
    image(backgroundImg, 0, 0, width, height);
  
    Engine.update(engine);
  
    push();
    translate(ground.position.x, ground.position.y);
    fill("brown");
    rectMode(CENTER);
    rect(0, 0, width * 2, 1);
    pop();
  
    push();
    translate(tower.position.x, tower.position.y);
    rotate(tower.angle);
    imageMode(CENTER);
    image(towerImage, 0, 0, 160, 310);
    pop();
  
    showBoats();
  
    for (var i = 0; i < balls.length; i++) {
      showCannonBalls(balls[i], i);
      collisionWithBoat(i);
    }
  
    cannon.display();
  
    
  }
  
  function collisionWithBoat(index) {
    for (var i = 0; i < boats.length; i++) {
      if (balls[index] !== undefined && boats[i] !== undefined) {
        var collision = Matter.SAT.collides(balls[index].body, boats[i].body);
  
        if (collision.collided) {
            boats[i].remove(i);
          
  
          Matter.World.remove(world, balls[index].body);
          delete balls[index];
        }
      }
    }
  }
  
  function keyPressed() {
    if (keyCode === DOWN_ARROW) {
      var cannonBall = new CannonBall(cannon.x, cannon.y);
      cannonBall.trajectory = [];
      Matter.Body.setAngle(cannonBall.body, cannon.angle);
      balls.push(cannonBall);
    }
  }
  
  function showCannonBalls(ball, index) {
    if (ball) {
      ball.display();
      ball.animate();
      if (ball.body.position.x >= width || ball.body.position.y >= height - 50) {
          ball.remove(index);
        
      }
    }
  }
  
  function showBoats() {
    if (boats.length > 0) {
      if (
        boats[boats.length - 1] === undefined ||
        boats[boats.length - 1].body.position.x < width - 300
      ) {
        var positions = [-40, -60, -70, -20];
        var position = random(positions);
        var boat = new Boat(
          width,
          height - 100,
          170,
          170,
          position,
          boatAnimation
        );
  
        boats.push(boat);
      }
  
      for (var i = 0; i < boats.length; i++) {
        if (boats[i]) {
          Matter.Body.setVelocity(boats[i].body, {
            x: -0.9,
            y: 0
          });
  
          boats[i].display();
          boats[i].animate();
          
          var collision= Matter.SAT.collides(this.tower,boats[i].body);
  
          if(collision.collided && !boats[i].isBroken) {
            isGameOver= true;
            gameOver ();
  
          }
  
          
      }
  
      
  
      else{ boats[i]
  
      }
  
      }
    } else {
      var boat = new Boat(width, height - 60, 170, 170, -60, boatAnimation);
      boats.push(boat);
    }
  }
  
  function keyReleased() {
    if (keyCode === DOWN_ARROW) {
      balls[balls.length - 1].shoot();
    }
  }
  
  
  function gameOver() {
    swal({
      title:"Game Over!",
      text: "Thanks for Playing!",
      imageUrl: "https://raw.githubusercontent.com/whitehatjr/PiratesInvasion/main/assets/boat.png", 
      imageSize: "150x150",
      confirmButtonText: "Play Again?"
    
    } , function (isConfirm) {
      if(isConfirm) {
        location.reload ()
      }
    }
    
      )
  }