(function ($) {
  Drupal.behaviors.schoeller_pricing = {
    attach: function(context) {
      var $placeholder = $('.price-range-replaceholder', context);
      if (!$placeholder.length) {
        return;
      }
     $placeholder.closest('.node').find('input[name="quantity"]').bind('keyup', this.quantity_update_handler);
    },
    quantity_update_handler: function() {
      var $this = $(this),
          quantity = parseInt($this.val(), 10);
          $placeholder = $this.closest('.node').find('.price-range-replaceholder'),
          placeholderText = $placeholder.text(),
          ranges = $placeholder.data('ranges'),
          pps = $placeholder.data('pps'),
          currency = $placeholder.data('currency'),
          before = placeholderText.search(/[0-9,.]+/) !== 0,
          wasComma = false,
          amount = 0;
      if (typeof pps == "undefined") {
        currency = placeholderText.match(/[^0-9,.]+/)[0];
        pps = placeholderText.match(/[0-9,.]+/)[0];
        $placeholder.data({'currency': currency, 'pps': pps});
      }
      // if it's a comma number, replace all periods with commas and vice versa
      if (pps.charAt(pps.length - 3) == ',') {
        wasComma = true;
        pps = pps.replace(/[.]/g, '§').replace(/[,]/g, '.').replace(/[§]/g, ',');
      }
      ranges.amount = parseFloat(pps, 10) - (ranges.unit / 100);

      if (quantity < ranges.ranges[0]) {
        amount = ranges.amount;
      }
      else {
        // loop through ranges in reverse order, break as soon as we got a match
        for (var i = ranges.ranges.length; i > 0; i--) {
          if (ranges.ranges[i-1] <= quantity) {
            // amount - percentage
            amount = (ranges.amount - (ranges.amount * (ranges.percentages[i-1] / 100)));
            break;
          }
        }
      }
      // Done doing maths, re-add unit price and make into a string
      amount = ((ranges.unit / 100) + amount).toString();
      // Add trailing 0s if necessary
      var pos = amount.search(/[.]/);
      // No decimals
      if (pos === -1) {
        amount = amount + '.00';
      }
      // 1 decimal
      if (pos === (amount.length - 2)) {
        amount = amount + '0';
      }
      // if it was a comma number, turn it back into one
      if (wasComma) {
        amount.replace(/[.]/g, '§').replace(/[,]/g, '.').replace(/[§]/g, ',');
      }
      // Re-add the currency symbol
      if (before) {
        amount = currency + amount;
      }
      else {
        amount = amount + currency;
      }
      // @TODO: thousands delimiter?
      $placeholder.text(amount);
    }
  }
})(jQuery);