var validExpeMail = false;
var validExpeLoc = false; //turned to true in geocoder.js
var validDestMail = false;
var validDestLoc = false; //turned to true in geocoder.js

function validateEmail(email) {
  //from https://stackoverflow.com/questions/46155/how-to-validate-an-email-address-in-javascript
  const re =
    /^(([^<>()[\]\\.,;:\s@"]+(\.[^<>()[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
  return re.test(String(email).toLowerCase());
}

$("#expeMail").change(function () {
  validExpeMail = validateEmail($("#expeMail").val());
  checkFormValid();
});

$("#destMail").change(function () {
  validDestMail = validateEmail($("#destMail").val());
  checkFormValid();
});

document
  .querySelector(".custom-file-input")
  .addEventListener("change", function (e) {
    const file = e.target.files[0];
    const fileName = file.name;
    var nextSibling = e.target.nextElementSibling;
    nextSibling.innerText = fileName;

    const filesize = (file.size / 1024 / 1024).toFixed(4); // MB
    if (filesize >= 2.2) {
      e.target.classList.add("is-invalid");
    } else {
      e.target.classList.remove("is-invalid");
    }
  });

function checkFormValid() {
  if (validExpeMail && validExpeLoc && validDestMail && validDestLoc) {
    $("#sendNewPlane").prop("disabled", false);
  }
}