$(function(){
  $.activateSelect2 = function(){
    $('select[data-selectdue="true"]').each($.activateSelect2Element);
  };

  $.activateSelect2Element = function(){
    var el = $(this);

    if (el.data('select2activated')) return true;
    el.data('select2activated', true);

    var dropdownParent;
    if (el.parents('div.modal').length > 0) dropdownParent = el.parents('div.modal');

    var placeholder = el.data('placeholder');
    if (el.data('search_url')) {
      el.select2({
        allowClear: true,
        placeholder: placeholder,
        minimumInputLength: 2,
        dropdownParent: dropdownParent,
        ajax: {
          url: el.data('search_url'),
          method: 'GET',
          dataType: 'json',
        }
      });
    } else if (el.data('preload_url')) {
      el.after('<p class="placeholder-glow"><span class="placeholder col-12"></span></p>');
      el.hide();
      $.ajax({
        dataType: "json",
        method: 'GET',
        url: el.data('preload_url'),
        success: function(result){
          // var values = ['MTAFRZ73T18L736U CIRDFA-DRAG-SPESE|Fabrizio AMATO - CIRDFA-DRAG-SPESE', 'DCCGCR73M22F158M DMA-DRAG-TENS|Giancarlo DE CICCO - DMA-DRAG-TENS'];
          // CREO I VALORI PREDEFINITIN IN BASE ALL'ATTRIBUTO data-values
          var values = el.data('values');
          if (!values) values = [];
          if (!Array.isArray(values)) {
            console.log("Valori predefiniti errati");
            values = [];
          }
          values.forEach(function(val){
            var my_option = result.find(function(row){
              return row.id == val;
            });
            if (!my_option) my_option = {id: val, text: `UNDEF ${val}`}
            var new_option = document.createElement("option");
            new_option.value = my_option.id;
            new_option.innerHTML = my_option.text;
            new_option.setAttribute('selected', 'selected');
            el.append(new_option);
          });
          // per la select2 multipla non deve essere presente l'elemento vuoto
          if (el.attr('multiple') != 'multiple') result.unshift({'id': '', 'text': ''});
          el.next('p.placeholder-glow').remove();
          el.show();
          el.select2({
            allowClear: true,
            placeholder: placeholder,
            selectOnClose: false,
            dropdownParent: dropdownParent,
            data: result
          });
        }
      });
    } else {
      el.select2({
        dropdownParent: dropdownParent,
      });
    }

  };
  
  setTimeout($.activateSelect2, 250);
});