import UIKit
import AVFoundation
ball1
class ViewController: UIViewController {

    var dirOfBall1 = "DOWN"
    
    // FINISH ME
    // add a variable called dirOfBall2 and
    // assign it "RIGHT"
    ???  ????? = ????

    
    // defines a variable called screenSize
    var screenSize:CGRect = UIScreen.main.bounds
    
    // defines variables for the screen height and screen width
    // these will get their values in the viewDidLoad() function (method)
    var screenHeight = 0
    var screenWidth = 0
    
    
    // this variable refers to the timer object
    var timer =  Timer()


    // this variable refers to the audio player
    var bombSoundEffect: AVAudioPlayer?


    // FINISH ME
    // Control + Drag your ball1 to here
    @IBOutlet weak var ball1: UIImageView! 
    
    
    // FINISH ME
    // Control + Drag your ball2 to here
    @IBOutlet weak var ball2: UIImageView!  
    
    // FINISH ME
    // Control + Drag your start button here
    @IBAction func startButtonEvent(_ sender: UIButton)
    {
        // shut down the timer
        timer.invalidate()

        // start the timer
        // and call timerAction() every 0.1 seconds
        timer = Timer.scheduledTimer(timeInterval: 0.1, target: self, selector: #selector(timerAction), userInfo: nil, repeats: true)
        

    }
    
    // FINISH ME
    // Control + Drag your stop button here
    @IBAction func stopButtonEvent(_ sender: UIButton)
    {
        // shut down the timer
        timer.invalidate()
    }

    @objc func timerAction()
    {
        // we will first get the height and
        // width of the ball1
        // FINISH ME
        let height = ball1.frame.size.????
        let width = ball1.frame.size.????


        // FINISH ME
        // move the 2 objects
        // back and forth
        // 1 vertically back and forth
        // 1 horizontally back and forth
        // I have done most of the first ball for you
        // You will need to handle the second ball
        // see if the dirOfBall1 is equal to "UP"
        if ???????? == ????
        {
        	// FINISH ME
            let x = ball1.frame.origin.?
            var y = ball1.frame.origin.?
            
            // see if y is greater than 4    
            if ?  ?  ?
            {
                // FINISH ME
                // decrease y by 4
            	??????
            }
            else
            {
                // FINISH ME
                // increase y by 4
                ????
                
                
                dirOfBall1 = "DOWN"
            }
            
            ball1.frame = CGRect(x: x, y: y, width: width, height: height)
        }
        else
        {
        	// FINISH ME
            let x = ball1.frame.origin.?
            var y = ball1.frame.origin.?
            if y + height + 4 < CGFloat(screenHeight)
            {
                // FINISH ME
                // increase y by 4
                ?????
            }
            else
            {
                // decrease y by 4
                ????
                
                // FINISH ME
                // set dirOfBall1 to "UP" (assign it the value "UP")
                dirOfBall1 = "UP"
            }
            
            // now we reset the frame of the ball1
            ball1.frame = CGRect(x: x, y: y, width: width, height: height)
            
            // debug info
            print("y=\(y)")
            print("ball1 height=\(height)")
            print("screenHeight=\(screenHeight)")
        }
        

        // FINISH ME
        // handle the second ball here

		// see if dirOfBall2 is equal to the String "LEFT"
        if ???  ??  ?????
        {
        	// FINISH ME
            var x = ball2.frame.origin.?
            let y = ball2.frame.origin.?
            
            // FINISH ME
            // see if x is greater than 4 (DO NOT USE let)
            ??  ? > ?
            {
                // FINISH ME
                // decrease x by 4
                ?????
            }
            else
            {
                // FINISH ME
                // increase x by 4
                ????
                
                
                // FINISH ME
                // set dirOfBall2 to "RIGHT" (assign it the value "RIGHT")
                ????? = ?????
            }
            
            ball2.frame = CGRect(x: x, y: y, width: width, height: height)
        }
        else
        {
        	// FINISH ME
            var x = ball2.frame.origin.?
            let y = ball2.frame.origin.?
            if x + width + 4 < CGFloat(screenWidth)
            {
                // FINISH ME
                // increase x by 4
                ????
            }
            else
            {
                // decrease x by 4
                ????
                
                dirOfBall2 = "LEFT"
            }
            
            // now we reset the frame of the ball1
            ball2.frame = CGRect(x: x, y: y, width: width, height: height)
            print("x=\(x)")
            print("width=\(width)")
            print("screenWidth=\(screenWidth)")
        }
        

        
        
        
        
        
        // play a sound if they collide
        if ball2.frame.intersects(ball1.frame)
        {
            // FINISH ME
            // call the function (method) playSound()
            // You call a method by it's name and parenthesis
            ?????????
        }
        

    }
    
    
    // DO NOT CHANGE ANYTHING BELOW EXCEPT FOR MAYBE
    // "explosion.mp3"  if you have your own short sound clip

    func playSound()
    {
        let path = Bundle.main.path(forResource: "explosion.mp3", ofType:nil)!
        let url = URL(fileURLWithPath: path)
        
        do {
            bombSoundEffect = try AVAudioPlayer(contentsOf: url)
            bombSoundEffect?.play()
        } catch {
            // couldn't load file :(
        }
    }

    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        // here we get the width and height of the screen
        screenSize = UIScreen.main.bounds
        screenWidth = Int(screenSize.width)
        screenHeight = Int(screenSize.height)
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


}