// For this project, you will complete the code for a JavaScript program to
// convert temperatures to and from celsius and fahrenheit.


/*
  You will add lines of code within the function calculate() to make it run.
  
  you will need to look up the formula for converting fahrenheit to celsius and vice versa, and write them out as code. 
  
  you will add the code to convert celsius values to fahrenheit values.
  
  you will add the code to convert fahrenheit values to celsius values.
  
  Then, test your program by entering a value for the Celsius or Fahrenheit inputs on the page, and checking the outcomes 
  
  Do not enter values for both Celsius and Fahrenheit at the same time. 
  
*/


let cDegree = "°C";
let fDegree = "°F";
let inputC = document.querySelector(".C");
let inputF = document.querySelector(".F");
let celsius;
let fahrenheit;

function calculate() {
  let celInput = document.getElementById("celInput").value;
  let fahInput = document.getElementById("fahInput").value;
  if (celInput != null && fahInput == "") {
    celsius = parseInt(celInput.toString());

    
    // 1. On this line, declare a new variable named convertedFahrenheit. You will set it equal to the formula for converting celsius to fahrenheit. Use the celsius variable in your formula (it has already been declared).
    
     //2.  On this line, reassign the variable fahrenheit to equal the convertedFahrenheit variable. 

    doMathFirst();
  } else if (celInput == "" && fahInput != null) {
    fahrenheit = parseInt(fahInput.toString());
    
    // 3. On this line, declare a new variable named convertedCelsius. Set this equal to the formula to convert fahrenheit to celsius. Use the fahrenheit variable in your formula (it has already been declared).
    
    // 4. On this line, reassign the variable celsius to equal the convertedCelsius variable. 
    
    //TEST YOUR CODE!!! Input a number into the celsius input and press calculate. The values for both celsius and fahrenheit should appear on the thermometer. If you have done it correctly, 0 degrees celsius should be 32 degrees fahrenheit. 30 degrees celsius should be 86 degrees fahrenheit etc. 
    
    doMathFirst();
  } else {
    console.log("You can't put two values in at once. Remove one.");
  }
}

function doMathFirst() {
  inputC.innerHTML = celsius + cDegree;
  inputF.innerHTML = fahrenheit + fDegree;
}