/**
 * adsPRO — globalny auto-init Select2.
 *
 * Inicjalizuje Select2 na kazdym <select> z >4 opcjami (oraz na select z
 * atrybutem data-adspro-select2="true"). Pomija .no-select2 i juz zainicjalizowane.
 * Wlacza allowClear gdy pierwsza opcja ma value="".
 *
 * Helper: window.adsproSelect2Init($root) — uruchamiany takze automatycznie
 * na document.ready oraz po kazdym AJAX (debounce).
 */
(function( $ )
{
  if ( typeof $ === 'undefined' || typeof $.fn === 'undefined' || typeof $.fn.select2 === 'undefined' )
  {
    return;
  }

  var THRESHOLD = 4;

  function should_init( $el )
  {
    if ( !$el.length )
    {
      return false;
    }

    if ( $el.data( 'select2' ) )
    {
      return false;
    }

    if ( $el.hasClass( 'no-select2' ) )
    {
      return false;
    }

    var force = $el.attr( 'data-adspro-select2' );

    if ( force === 'false' )
    {
      return false;
    }

    if ( $el.closest( '.select2-container' ).length )
    {
      return false;
    }

    if ( $el.closest( '.dataTables_length' ).length )
    {
      return false;
    }

    if ( force === 'true' )
    {
      return true;
    }

    var option_count = $el.prop( 'options' ) ? $el.prop( 'options' ).length : $el.find( 'option' ).length;

    return option_count > THRESHOLD;
  }

  function build_options( $el )
  {
    var options = { width: '100%' };
    var first_option = $el.find( 'option' ).first();
    var first_value = first_option.length ? first_option.attr( 'value' ) : null;
    var placeholder = $el.attr( 'placeholder' );

    if ( first_option.length && ( first_value === '' || typeof first_value === 'undefined' ) )
    {
      options.allowClear = true;

      if ( !placeholder )
      {
        var text = $.trim( first_option.text() );
        placeholder = text || 'Wybierz...';
      }
    }

    if ( placeholder )
    {
      options.placeholder = placeholder;
    }

    if ( $.fn.select2.defaults && typeof $.fn.select2.defaults.set === 'function' )
    {
      // jezeli polski jezyk dostepny — nie wymuszamy globalnie, Select2 sam dobierze
    }

    return options;
  }

  function init_one( $el )
  {
    if ( !should_init( $el ) )
    {
      return;
    }

    try
    {
      $el.select2( build_options( $el ) );
      $el.data( 'adspro-select2-ready', true );
    }
    catch ( err )
    {
      if ( window.console && console.warn )
      {
        console.warn( '[adspro-select2] init failed', err );
      }
    }
  }

  function init_all( $root )
  {
    var $scope = $root && $root.length ? $root : $( document.body );
    var $selects = $scope.find( 'select' );

    if ( $scope.is( 'select' ) )
    {
      $selects = $selects.add( $scope );
    }

    $selects.each( function()
    {
      init_one( $( this ) );
    } );
  }

  window.adsproSelect2Init = init_all;

  $( function()
  {
    init_all();
  } );

  var ajax_debounce_timer = null;

  $( document ).ajaxComplete( function()
  {
    if ( ajax_debounce_timer )
    {
      clearTimeout( ajax_debounce_timer );
    }

    ajax_debounce_timer = setTimeout( function()
    {
      init_all();
    }, 150 );
  } );
})( window.jQuery );