//
//  ViewController.swift
//  Simple Calculator
//

import UIKit

class ViewController: UIViewController {

    // FINISH ME
    // create (define) a variable called whichNumber and set it to 1
    // this controls which field has the focus
    ??? ??????? = ?
    
    // FINISH ME
    // Control + Drag the Number 1 TextField to here
    @IBOutlet weak var number1TextField: UITextField!
    
    
    // FINISH ME
    // Control + Drag the Op Label to here
    @IBOutlet weak var opLabel: UILabel!
    
    
    // FINISH ME
    // Control + Drag the Number 2 TextField to here
    @IBOutlet weak var number2TextField: UITextField!
    
    
    // FINISH ME
    // Control + Drag the answerLabel Label to here
    @IBOutlet weak var answerLabel: UILabel!
    

    // FINISH ME
    // Control + Drag the Number 1 TextField to here
    // NOTE: This is a Touch Down Action Event
    @IBAction func number1TouchDownEvent(_ sender: UITextField)
    {
        // FINISH ME
        // set whichNumber to 1
        // which indicates number1TextField has the focus
        whichNumber = 1
    }
    
    // FINISH ME
    // Control + Drag the Number 2 TextField to here
    // NOTE: This is a Touch Down Action Event
    @IBAction func number2TouchDownEvent(_ sender: UITextField)
    {
        // FINISH ME
        // set whichNumber to 2
        // which indicates number2TextField has the focus
        whichNumber = 2
    }
    
    // FINISH ME
    // Control + Drag each digit Button to here
    @IBAction func digitButtonEvent(_ sender: UIButton)
    {
        // here we get the digit on the digit button
        let digitOnButton = sender.title(for: .normal)!
        
        print(whichNumber) // for testing only
        
        if whichNumber == 1
        {
            // FINISH ME
            // join on digitOnButton
            number1TextField.text = number1TextField.text! + ?????
        }
        else if whichNumber == 2
        {
            // FINISH ME
            // join on digitOnButton
            number2TextField.text = number2TextField.text! + ?????
        }
    }
    
    
    // FINISH ME
    // Control + Drag the clear Button here
    @IBAction func clearButtonEvent(_ sender: UIButton)
    {
        // FINISH ME
        // set number1TextField to ""
        number1TextField.???? = ""
        
        
        // FINISH ME
        // set number2TextField to ""
        ????
        
        
        // FINISH ME
        // set answerLabel to ""
        ?????
        
        
        // FINISH ME
        // set opLabel to "+"
        ???????
    }
    
    
    
    // FINISH ME
    // Control + Drag each operator button to this function (method)
    @IBAction func opButtonEvent(_ sender: UIButton)
    {
        // sender is the temporary name of the button
        // that was clicked
        // this gets the text on the button that
        // got clicked, which is the operator + or - or * or / or % or ^
        let opOnButton = sender.title(for: .normal)!
        
        
        // FINISH ME
        // check and see if opOnButton is equal to a "+"
        if opOnButton == "+"
        {
            opLabel.text = "+"
        }
            // FINISH ME
            // check and see if opOnButton is equal to a "-"
        else if opOnButton == "-"
        {
            // FINISH ME
            // set the text of opLabel to "-"
            ?????
        }
            // FINISH ME
            // create the other else if statements for *, /, %, and ^
        else if opOnButton == "*"
        {
            // FINISH ME
            // set the text of opLabel to "*"
            ???????
        }
        else if opOnButton == "/"
        {
            // FINISH ME
            // set the text of opLabel to "/"
            ??????
        }
        else if opOnButton == "%"
        {
            // FINISH ME
            // set the text of opLabel to "%"
            ???????
        }
        
    }
    

    // FINISH ME
    // LINK the Enter button to this function
    @IBAction func enterButtonEvent(_ sender: UIButton)
    {
        // FINISH ME
        // convert the number1TextField.text! to an Int
        let firstNumber = ???(number1TextField.????!)
        
        // FINISH ME
	// Get the text on the opLabel (and we unwrap it)
        let op = ?????.????!
        
        
        // FINISH ME
        // convert the number2TextField.text! to an Int
        let secondNumber = ???(number2TextField.????!)
        

        // FINISH ME
        // create the shadow variables for firstNumber and secondNumber
        if let ?????? = firstNumber, let ????? = secondNumber
        {
            // FINISH ME
            // check and see if op is a "+"
            if ?? == ???
            {
                // FINISH ME
                // add firstNumber and secondNumber
                let result = ??????
                

                // FINISH ME
                // set the text field of answerLabel to the result as a String
                 answerLabel.???? = ?????(result)

            }
                // FINISH ME
                // check and see if op is a "-"
            else ?? ?? == ???
            {
                // FINISH ME
                // subtract secondNumber from firstNumber
                let result = firstNumber - secondNumber
                

                // FINISH ME
                // set the text field of answerLabel to the result as a String
                // answerLabel.???? = ?????(result)
               
            }
                
                // FINISH ME
                // check and see if op is a "*"
            else ?? ?? == ???
            {
                // FINISH ME
                // multiply firstNumber and secondNumber
                let result = firstNumber * secondNumber
                

                // FINISH ME
                // convert result to a String
                // ??????
            }
                
                // FINISH ME
                // check and see if op is a "/"
            else ?? ?? == ???
            {
                // FINISH ME
                // divide firstNumber by secondNumber
                let result = firstNumber / secondNumber
                

                // FINISH ME
                // convert the result to a String
                // ???????
            }
                
                // FINISH ME
                // check and see if op is a "%"  (modulus)
            else ?? ?? == ???
            {
                // FINISH ME
                // modulus firstNumber by secondNumber
                let result = firstNumber % secondNumber
                

                // FINISH ME
                // convert result to a String
                // ?????
            }
            
            
        }
        else
        {
            // FINISH ME
            // put an error message on the answerLabel
            // answerLabel.???? = "??????????"
        }
    }
    

    
    
    
    
    
    
    
    // DO NOT CHANGE THIS
    override func viewDidLoad()
    {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }


} // END OF CLASS MARKER