<?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_Validate
 * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 * @version    $Id$
 */

/**
 * @see Zend_Validate_Abstract
 */
require_once 'Zend/Validate/Abstract.php';

/**
 * @category   Zend
 * @package    Zend_Validate
 * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_Validate_Callback extends Zend_Validate_Abstract
{
    /**
     * Invalid callback
     */
    const INVALID_CALLBACK = 'callbackInvalid';

    /**
     * Invalid value
     */
    const INVALID_VALUE = 'callbackValue';

    /**
     * Validation failure message template definitions
     *
     * @var array
     */
    protected $_messageTemplates = array(
        self::INVALID_VALUE    => "'%value%' is not valid",
        self::INVALID_CALLBACK => "Failure within the callback, exception returned",
    );

    /**
     * Callback in a call_user_func format
     *
     * @var string|array
     */
    protected $_callback = null;

    /**
     * Default options to set for the filter
     *
     * @var mixed
     */
    protected $_options = array();

    /**
     * Sets validator options
     *
     * @param  string|array $callback
     * @param  mixed   $max
     * @param  boolean $inclusive
     * @return void
     */
    public function __construct($callback = null)
    {
        if (is_callable($callback)) {
            $this->setCallback($callback);
        } elseif (is_array($callback)) {
            if (isset($callback['callback'])) {
                $this->setCallback($callback['callback']);
            }
            if (isset($callback['options'])) {
                $this->setOptions($callback['options']);
            }
        }

        if (null === ($initializedCallack = $this->getCallback())) {
            require_once 'Zend/Validate/Exception.php';
            throw new Zend_Validate_Exception('No callback registered');
        }
    }

    /**
     * Returns the set callback
     *
     * @return mixed
     */
    public function getCallback()
    {
        return $this->_callback;
    }

    /**
     * Sets the callback
     *
     * @param  string|array $callback
     * @return Zend_Validate_Callback Provides a fluent interface
     */
    public function setCallback($callback)
    {
        if (!is_callable($callback)) {
            require_once 'Zend/Validate/Exception.php';
            throw new Zend_Validate_Exception('Invalid callback given');
        }
        $this->_callback = $callback;
        return $this;
    }

    /**
     * Returns the set options for the callback
     *
     * @return mixed
     */
    public function getOptions()
    {
        return $this->_options;
    }

    /**
     * Sets options for the callback
     *
     * @param  mixed $max
     * @return Zend_Validate_Callback Provides a fluent interface
     */
    public function setOptions($options)
    {
        $this->_options = (array) $options;
        return $this;
    }

    /**
     * Defined by Zend_Validate_Interface
     *
     * Returns true if and only if the set callback returns
     * for the provided $value
     *
     * @param  mixed $value
     * @return boolean
     */
    public function isValid($value)
    {
        $this->_setValue($value);

        $options  = $this->getOptions();
        $callback = $this->getCallback();
        $args     = func_get_args();
        $options  = array_merge($args, $options);

        try {
            if (!call_user_func_array($callback, $options)) {
                $this->_error(self::INVALID_VALUE);
                return false;
            }
        } catch (Exception $e) {
            $this->_error(self::INVALID_CALLBACK);
            return false;
        }

        return true;
    }
}