<?php

use Qs\Form\ResourceInterface;
use Qs\Form\ResourceTrait;

class Qs_Form_Decorator_Numeric extends Qs_Form_Decorator_ViewHelper implements ResourceInterface
{
    use ResourceTrait;

    public function __construct($options = null)
    {
        parent::__construct($options);
        $this->addScript('js/jquery-autoNumeric.js');
    }

    public function render($content)
    {
        $this->_addResources();
        return parent::render($content);
    }

    protected function _addResources()
    {
        /** @var $element Qs_Form_Element_Numeric */
        $element = $this->getElement();
        $options = [
            'mDec' => $element->getPrecision(),
            'aNeg' => ($element->getNegative()) ? '-' : '',
            'aSep' => $element->getGroup(),
            'aDec' => $element->getDecimal(),
            'mNum' => $element->getLength(),
        ];
        /** @var $doc Qs_Doc */
        $doc = Zend_Registry::get('doc');
        $doc->addScripts($this->getScripts())
            ->addInitFunction('$("#' . $element->getId() . '").autoNumeric', [$options]);
        return $this;
    }

    /**
     * @param Qs_Form_Element_Numeric $element
     * @return null|string
     */
    public function getValue($element)
    {
        $value = parent::getValue($element);
        if (null !== $value) {
            $value = number_format(
                (float) $value,
                $element->getPrecision(),
                $element->getDecimal(),
                $element->getGroup()
            );
        }
        return $value;
    }

}