<?php

/**
 * @method Qs_Form_Decorator_ViewHelper setAdditionalHtmlBeforeElement
 * @method Qs_Form_Decorator_ViewHelper setAdditionalHtmlAfterElement
 * @method string getAdditionalHtmlBeforeElement
 * @method string getAdditionalHtmlAfterElement
 */
class Qs_Form_Decorator_ViewHelper extends Zend_Form_Decorator_ViewHelper
{
    protected $_additionalHtml = array(
        'BeforeElement' => '',
        'AfterElement'  => '',
    );

    public function __call($method, $args)
    {
        if ('getAdditionalHtml' == substr($method, 0, 17)) {
            $section = substr($method, 17);
            return $this->_getAdditionalHtml($section);
        } else if ('setAdditionalHtml' == substr($method, 0, 17)) {
            $section = substr($method, 17);
            return $this->_setAdditionalHtml($section, $args[0]);
        }
        throw new Zend_Form_Decorator_Exception(sprintf('Method %s does not exist', $method));
    }

    public function render($content)
    {
        /** @var $element Zend_Form_Element_Multi */
        $element = $this->getElement();

        $view = $element->getView();
        if (null === $view) {
            throw new Zend_Form_Decorator_Exception('ViewHelper decorator cannot render without a registered view object');
        }

        if (method_exists($element, 'getMultiOptions')) {
            $element->getMultiOptions();
        }

        $helper        = $this->getHelper();
        $separator     = $this->getSeparator();
        $value         = $this->getValue($element);
        $attribs       = $this->getElementAttribs();
        $name          = $element->getFullyQualifiedName();
        $id            = $element->getId();
        $attribs['id'] = $id;

        if (array_key_exists('beforeHelper', $attribs) && is_callable($attribs['beforeHelper'])) {
            call_user_func($attribs['beforeHelper'], [
                'separator' => &$separator,
                'value'     => &$value,
                'attribs'   => &$attribs,
                'name'      => &$name,
                'id'        => &$id,
            ]);
            unset($attribs['beforeHelper']);
        }

        $elementContent = $view->$helper($name, $value, $attribs, $element->options);
        switch ($this->getPlacement()) {
            case self::APPEND:
                return $content . $separator
                    . $this->getAdditionalHtmlBeforeElement()
                    . $elementContent
                    . $this->getAdditionalHtmlAfterElement();
            case self::PREPEND:
                return $this->getAdditionalHtmlBeforeElement()
                    . $elementContent
                    . $this->getAdditionalHtmlAfterElement()
                    . $separator . $content;
            default:
                return $this->getAdditionalHtmlBeforeElement()
                    . $elementContent
                    . $this->getAdditionalHtmlAfterElement();
        }
    }

    function setAdditionalHtml($options = array())
    {
        foreach ($options as $section => $html) {
            $this->_setAdditionalHtml($section, $html);
        }
        return $this;
    }

    protected function _setAdditionalHtml($section, $html)
    {
        if (!isset($this->_additionalHtml[$section])) {
            throw new Zend_Form_Decorator_Exception('Invalid section for decorator additional HTML');
        }
        $this->_additionalHtml[$section] = $html;
        return $this;
    }

    protected function _getAdditionalHtml($section = null)
    {
        if (empty($section)) {
            return $this->_additionalHtml;
        }
        if (isset($this->_additionalHtml[$section])) {
            return $this->_additionalHtml[$section];
        }
        return '';
    }
}