function check_checkboxes(name) {
    const checkboxes = document.querySelectorAll(`input[name="${name}"]:checked`);
    let values = [];
    checkboxes.forEach((checkbox) => {
        values.push("\"" + checkbox.value + "\"");
    });
    if (values) {
      return values;
    } else {
      return null;
    }
}

function testor(input) {
  let v1 = [];
  input.forEach((input) => {
    v1.push("\"" + input.trim() + "\"");
  });
  if (v1) {
    return v1;
  } else {
    return null;
  }
}

function showInput(e) {
  document.getElementById("result").innerHTML = '';
  e.preventDefault();
  document.getElementById("result").style.display = "flex";
  var output_info = document.getElementById("myform");
  var display = document.getElementById("result");


  
  var d = new Date();
  var datestring = d.getFullYear() + "-" + ("0"+(d.getMonth()+1)).slice(-2) + "-" + ("0" + d.getDate()).slice(-2) + "T" + ("0" + d.getHours()).slice(-2) + ":" + ("0" + d.getMinutes()).slice(-2) + ":00+02:00";

  var form = document.querySelector('form[id="myform"]');
  var title = form.elements['title'].value;
  var content = form.elements['content'].value;
  var when = form.elements['when'].value;
  var covid = form.elements['covid'].value;
  var price = form.elements['price'].value;
  var contact = form.elements['contact'].value;
  var events = check_checkboxes('events');
  if (form.elements['newevents']) { var newevents = testor(form.elements['newevents'].value.split(',')); }
  var categories = check_checkboxes('categories');
  if (form.elements['newcategories']) { var newcategories = testor(form.elements['newcategories'].value.split(',')); }
  var tags = check_checkboxes('tags');
  if (form.elements['newtags']) { var newtags = testor(form.elements['newtags'].value.split(',')); }
  var featured = check_checkboxes('featured');
  var about = check_checkboxes('about');

  var foundations = check_checkboxes('foundations');
  if (form.elements['newfoundations']) { var newfoundations = testor(form.elements['newfoundations'].value.split(',')); }
  
  
  var lastmod = form.elements['lastmod'].value;
  if (lastmod) {
    var dl = new Date(lastmod);
    var lastmod = dl.getFullYear() + "-" + ("0"+(dl.getMonth()+1)).slice(-2) + "-" + ("0" + dl.getDate()).slice(-2) + "T" + "14:" + "00:00+02:00";
}

  if (newtags != '""') {
    var ntags = newtags;
  }

  if (tags != '') {
    var ntags = tags;
  }
 
  if (tags != '' && newtags != '""') {
    var ntags = tags + "," + newtags;
  }

  if (newcategories != '""') {
    var ncategories = newcategories;
  }

  if (categories != '') {
    var ncategories = categories;
  }
 
  if (categories != '' && newcategories != '""') {
    var ncategories = categories + "," + newcategories;
  }

  
  
  if (newevents != '""') {
    var nevents = newevents;
  }

  if (events != '') {
    var nevents = events;
  }
 
  if (events != '' && newevents != '""') {
    var nevents = events + "," + newevents;
  }

  
  
  
  if (newfoundations != '""') {
    var nfoundations = newfoundations;
  }

  if (foundations != '') {
    var nfoundations = foundations;
  }
 
  if (foundations != '' && newfoundations != '""') {
    var nfoundations = foundations + "," + newfoundations;
  }

  
  

  if (!title) {
    display.innerHTML += "Title is missing..<br>"
  }

  if (!content) {
    display.innerHTML += "Content is missing..<br>"
  }

  

  if (title && content) {
    display.innerHTML += "---<br>";
    display.innerHTML += "title: \"" + title + "\"<br>";
    
    if (lastmod) {
        display.innerHTML += "lastmod: " + lastmod + "<br>";
    } else {
        display.innerHTML += "date: " + datestring + "<br>";
    }
    if (featured != '') {
      display.innerHTML += "featured: true<br>";
    }

    if (about != '') {
      display.innerHTML += "about: true<br>";
    }

    if (when) {
      display.innerHTML += "when: \"" + when + "\"<br>";
    }
    
    if (ncategories) {
        display.innerHTML += "categories: \[" + ncategories + "]<br>";
    }

    if (nevents) {
        display.innerHTML += "events: \[" + nevents + "]<br>";
    }
    
    if (nfoundations) {
        display.innerHTML += "foundations: \[" + nfoundations + "]<br>";
    }
    
    if (ntags) {
        display.innerHTML += "tags: \[" + ntags + "]<br>";
    }
    if (covid) {
        display.innerHTML += "covid: \"" + covid + "\"<br>";
    }
    if (price) {
        display.innerHTML += "price: \"" + price + "\"<br>";
    }

    if (contact) {
        display.innerHTML += "contact: \"" + contact + "\"<br>";
    }
    display.innerHTML += "---<br>";
    if (content) {
      display.innerHTML += content;
    }
  }
}