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 <?php
 /**
  * Zend Framework
  *
  * LICENSE
  *
  * This source file is subject to the new BSD license that is bundled
  * with this package in the file LICENSE.txt.
  * It is also available through the world-wide-web at this URL:
  * http://framework.zend.com/license/new-bsd
  * If you did not receive a copy of the license and are unable to
  * obtain it through the world-wide-web, please send an email
  * to license@zend.com so we can send you a copy immediately.
  *
  * @category   Zend
  * @package    Zend_Form
  * @subpackage Element
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  * @version    $Id$
  */
 
 /** @see Zend_Form_Element_Xhtml */
 // require_once 'Zend/Form/Element/Xhtml.php';
 
 /** @see Zend_Captcha_Adapter */
 // require_once 'Zend/Captcha/Adapter.php';
 
 /**
  * Generic captcha element
  *
  * This element allows to insert CAPTCHA into the form in order
  * to validate that human is submitting the form. The actual
  * logic is contained in the captcha adapter.
  *
  * @see http://en.wikipedia.org/wiki/Captcha
  *
  * @category   Zend
  * @package    Zend_Form
  * @subpackage Element
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  */
 class Zend_Form_Element_Captcha extends Zend_Form_Element_Xhtml
 {
     /**
      * Captcha plugin type constant
      */
     const CAPTCHA = 'CAPTCHA';
 
     /**
      * Captcha adapter
      *
      * @var Zend_Captcha_Adapter
      */
     protected $_captcha;
 
     /**
      * Get captcha adapter
      *
      * @return Zend_Captcha_Adapter
      */
     public function getCaptcha()
     {
         return $this->_captcha;
     }
 
     /**
      * Set captcha adapter
      *
      * @param string|array|Zend_Captcha_Adapter $captcha
      * @param array $options
      */
     public function setCaptcha($captcha, $options = array())
     {
         if ($captcha instanceof Zend_Captcha_Adapter) {
             $instance = $captcha;
         } else {
             if (is_array($captcha)) {
                 if (array_key_exists('captcha', $captcha)) {
                     $name = $captcha['captcha'];
                     unset($captcha['captcha']);
                 } else {
                     $name = array_shift($captcha);
                 }
                 $options = array_merge($options, $captcha);
             } else {
                 $name = $captcha;
             }
 
             $name = $this->getPluginLoader(self::CAPTCHA)->load($name);
             if (empty($options)) {
                 $instance = new $name;
             } else {
                 $r = new ReflectionClass($name);
                 if ($r->hasMethod('__construct')) {
                     $instance = $r->newInstanceArgs(array($options));
                 } else {
                     $instance = $r->newInstance();
                 }
             }
         }
 
         $this->_captcha = $instance;
         $this->_captcha->setName($this->getName());
         return $this;
     }
 
     /**
      * Constructor
      *
      * $spec may be:
      * - string: name of element
      * - array: options with which to configure element
      * - Zend_Config: Zend_Config with options for configuring element
      *
      * @param  string|array|Zend_Config $spec
      * @return void
      */
     public function __construct($spec, $options = null)
     {
         parent::__construct($spec, $options);
         $this->setAllowEmpty(true)
              ->setRequired(true)
              ->setAutoInsertNotEmptyValidator(false)
              ->addValidator($this->getCaptcha(), true);
     }
 
     /**
      * Set options
      *
      * Overrides to allow passing captcha options
      *
      * @param  array $options
      * @return Zend_Form_Element_Captcha
      */
     public function setOptions(array $options)
     {
         $captcha        = null;
         $captchaOptions = array();
 
         if (array_key_exists('captcha', $options)) {
             $captcha = $options['captcha'];
             if (array_key_exists('captchaOptions', $options)) {
                 $captchaOptions = $options['captchaOptions'];
                 unset($options['captchaOptions']);
             }
             unset($options['captcha']);
         }
         parent::setOptions($options);
 
         if(null !== $captcha) {
             $this->setCaptcha($captcha, $captchaOptions);
         }
         return $this;
     }
 
     /**
      * Render form element
      *
      * @param  Zend_View_Interface $view
      * @return string
      */
     public function render(Zend_View_Interface $view = null)
     {
         $captcha    = $this->getCaptcha();
         $captcha->setName($this->getFullyQualifiedName());
 
         if (!$this->loadDefaultDecoratorsIsDisabled()) {
             $decorators = $this->getDecorators();
             $decorator  = $captcha->getDecorator();
             $key        = get_class($this->_getDecorator($decorator, null));
 
             if (!empty($decorator) && !array_key_exists($key, $decorators)) {
                 array_unshift($decorators, $decorator);
             }
 
             $decorator = array('Captcha', array('captcha' => $captcha));
             $key       = get_class($this->_getDecorator($decorator[0], $decorator[1]));
 
             if ($captcha instanceof Zend_Captcha_Word && !array_key_exists($key, $decorators)) {
                 array_unshift($decorators, $decorator);
             }
 
             $this->setDecorators($decorators);
         }
 
         $this->setValue($this->getCaptcha()->generate());
 
         return parent::render($view);
     }
 
     /**
      * Retrieve plugin loader for validator or filter chain
      *
      * Support for plugin loader for Captcha adapters
      *
      * @param  string $type
      * @return Zend_Loader_PluginLoader
      * @throws Zend_Loader_Exception on invalid type.
      */
     public function getPluginLoader($type)
     {
         $type = strtoupper($type);
         if ($type == self::CAPTCHA) {
             if (!isset($this->_loaders[$type])) {
                 // require_once 'Zend/Loader/PluginLoader.php';
                 $this->_loaders[$type] = new Zend_Loader_PluginLoader(
                     array('Zend_Captcha' => 'Zend/Captcha/')
                 );
             }
             return $this->_loaders[$type];
         } else {
             return parent::getPluginLoader($type);
         }
     }
 
     /**
      * Add prefix path for plugin loader for captcha adapters
      *
      * This method handles the captcha type, the rest is handled by
      * the parent
      * @param  string $prefix
      * @param  string $path
      * @param  string $type
      * @return Zend_Form_Element
      * @see Zend_Form_Element::addPrefixPath
      */
     public function addPrefixPath($prefix, $path, $type = null)
     {
         $type = strtoupper($type);
         switch ($type) {
             case null:
                 $loader = $this->getPluginLoader(self::CAPTCHA);
                 $nsSeparator = (false !== strpos($prefix, '\\'))?'\\':'_';
                 $cPrefix = rtrim($prefix, $nsSeparator) . $nsSeparator . 'Captcha';
                 $cPath   = rtrim($path, '/\\') . '/Captcha';
                 $loader->addPrefixPath($cPrefix, $cPath);
                 return parent::addPrefixPath($prefix, $path);
             case self::CAPTCHA:
                 $loader = $this->getPluginLoader($type);
                 $loader->addPrefixPath($prefix, $path);
                 return $this;
             default:
                 return parent::addPrefixPath($prefix, $path, $type);
         }
     }
 
     /**
      * Load default decorators
      *
      * @return Zend_Form_Element_Captcha
      */
     public function loadDefaultDecorators()
     {
         if ($this->loadDefaultDecoratorsIsDisabled()) {
             return $this;
         }
 
         $decorators = $this->getDecorators();
         if (empty($decorators)) {
             $this->addDecorator('Errors')
                  ->addDecorator('Description', array('tag' => 'p', 'class' => 'description'))
                  ->addDecorator('HtmlTag', array('tag' => 'dd', 'id' => $this->getName() . '-element'))
                  ->addDecorator('Label', array('tag' => 'dt'));
         }
         return $this;
     }
 
     /**
      * Is the captcha valid?
      *
      * @param  mixed $value
      * @param  mixed $context
      * @return boolean
      */
     public function isValid($value, $context = null)
     {
         $this->getCaptcha()->setName($this->getName());
         $belongsTo = $this->getBelongsTo();
         if (empty($belongsTo) || !is_array($context)) {
             return parent::isValid($value, $context);
         }
 
         $name     = $this->getFullyQualifiedName();
         $root     = substr($name, 0, strpos($name, '['));
         $segments = substr($name, strpos($name, '['));
         $segments = ltrim($segments, '[');
         $segments = rtrim($segments, ']');
         $segments = explode('][', $segments);
         array_unshift($segments, $root);
         array_pop($segments);
         $newContext = $context;
         foreach ($segments as $segment) {
             if (array_key_exists($segment, $newContext)) {
                 $newContext = $newContext[$segment];
             }
         }
 
         return parent::isValid($value, $newContext);
     }
 }