const calcForm = document.getElementById('calculator')  // const ist hier besser als let, da immutable
calcForm.addEventListener('submit', calculate)

function calculate(e){
  let aromaamount = document.getElementById("aromaamount").value
  let aromaconc = document.getElementById("aromaconc").value / 100
  let vg = document.getElementById("vg").value
  let pg = document.getElementById("pg").value
  let other = document.getElementById("other").value
  let nicdose = document.getElementById("nicdose").value
  let nicshotamount = document.getElementById("nicshotamount").value
  let nicshotnicppm = document.getElementById("nicshotnicppm").value
  let nicshotvg = document.getElementById("nicshotvg").value
  let nicshotpg = document.getElementById("nicshotpg").value

  if(vg * 1 + pg * 1 + other * 1 != 100){
  } else if(nicshotvg * 1 + nicshotpg * 1 != 100){
  } else {

    document.getElementById("results").style.display="block"
    let volume = aromaamount / aromaconc
    let countnicshot = (volume * nicdose) / (nicshotamount * nicshotnicppm)
    let amountothers = volume / 100 * other
    let amountvg = volume / 100 * vg - countnicshot * nicshotamount * nicshotvg / 100
    let amountpg = volume / 100 * pg - countnicshot * nicshotamount * nicshotpg / 100 - aromaamount

    document.getElementById("volume").value = volume
    document.getElementById("countnicshot").value = countnicshot
    document.getElementById("amountothers").value = amountothers
    document.getElementById("amountvg").value = amountvg
    document.getElementById("amountpg").value = amountpg
  }

  e.preventDefault()  // https://developer.mozilla.org/en-US/docs/Web/API/Event/preventDefault
}