<?php

/**
 * Validation Class.  Used for validation of model data
 *
 * PHP versions 4 and 5
 *
 * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
 * Copyright 2005-2010, Cake Software Foundation, Inc. (http://cakefoundation.org)
 *
 * Licensed under The MIT License
 * Redistributions of files must retain the above copyright notice.
 *
 * @copyright     Copyright 2005-2010, Cake Software Foundation, Inc. (http://cakefoundation.org)
 * @link          http://cakephp.org CakePHP(tm) Project
 * @package       cake
 * @subpackage    cake.cake.libs
 * @since         CakePHP(tm) v 1.2.0.3830
 * @license       MIT License (http://www.opensource.org/licenses/mit-license.php)
 */
//if (!class_exists('Multibyte')) {
//	App::import('Core', 'Multibyte', false);
//}
/**
 * Offers different validation methods.
 *
 * @package       cake
 * @subpackage    cake.cake.libs
 * @since         CakePHP v 1.2.0.3830
 */
//class Validation extends Object {
class WPToolset_Cake_Validation {

    /**
     * Set the value of methods $check param.
     *
     * @var string
     * @access public
     */
    var $check = null;

    /**
     * Set to a valid regular expression in the class methods.
     * Can be set from $regex param also
     *
     * @var string
     * @access public
     */
    var $regex = null;

    /**
     * Some complex patterns needed in multiple places
     *
     * @var array
     * @access private
     */
    var $__pattern = array(
        'hostname' => '(?:[_\p{L}0-9][-_\p{L}0-9]*\.)*(?:[\p{L}0-9][-\p{L}0-9]{0,62})\.(?:(?:[a-z]{2}\.)?[a-z]{2,})'
    );

    /**
     * Some class methods use a country to determine proper validation.
     * This can be passed to methods in the $country param
     *
     * @var string
     * @access public
     */
    var $country = null;

    /**
     * Some class methods use a deeper validation when set to true
     *
     * @var string
     * @access public
     */
    var $deep = null;

    /**
     * Some class methods use the $type param to determine which validation to perfom in the method
     *
     * @var string
     * @access public
     */
    var $type = null;

    /**
     * Holds an array of errors messages set in this class.
     * These are used for debugging purposes
     *
     * @var array
     * @access public
     */
    var $errors = array();

    /**
     * Gets a reference to the Validation object instance
     *
     * @return object Validation instance
     * @access public
     * @static
     */
    function &getInstance() {
        static $instance = array();

        if (!$instance) {
            $instance[0] = new WPToolset_Cake_Validation();
        }
        return $instance[0];
    }

    /**
     * Checks that a string contains something other than whitespace
     *
     * Returns true if string contains something other than whitespace
     *
     * $check can be passed as an array:
     * array('check' => 'valueToCheck');
     *
     * @param mixed $check Value to check
     * @return boolean Success
     * @access public
     */
    function notEmpty($check) {
        $_this = &WPToolset_Cake_Validation::getInstance();
        $_this->__reset();
        $_this->check = $check;

        if (is_array($check)) {
            $_this->_extract($check);
        }

        if (empty($_this->check) && $_this->check != '0') {
            return false;
        }
        $_this->regex = '/[^\s]+/m';
        return $_this->_check();
    }

    /**
     * Checks if a value is valid hexadecimal.
     *
     * @param string $check Value to check
     * @return boolean Succcess
     * @access public
     */
    function hexadecimal($check) {
        return preg_match('/^#[a-f0-9]{6}$/i', $check);
    }

    /**
     * Checks that a string contains only integer or letters
     *
     * Returns true if string contains only integer or letters
     *
     * $check can be passed as an array:
     * array('check' => 'valueToCheck');
     *
     * @param mixed $check Value to check
     * @return boolean Success
     * @access public
     */
    function alphaNumeric($check) {
        $_this = &WPToolset_Cake_Validation::getInstance();
        $_this->__reset();
        $_this->check = $check;

        if (is_array($check)) {
            $_this->_extract($check);
        }

        if (empty($_this->check) && $_this->check != '0') {
            return false;
        }
        $_this->regex = '/^[a-zA-Z0-9]*$/mu';
        $return = $_this->_check();

        if (!$return) {
            $_this->regex = '/^[\p{Ll}\p{Lm}\p{Lo}\p{Lt}\p{Lu}\p{Nd}]+$/mu';
            $return = $_this->_check();
        }

        return $_this->_check();
    }

    function alphaNumericWhitespaces($check) {
        $_this = &WPToolset_Cake_Validation::getInstance();
        $_this->__reset();
        $_this->check = $check;

        if (is_array($check)) {
            $_this->_extract($check);
        }

        if (empty($_this->check) && $_this->check != '0') {
            return false;
        }
        $_this->regex = '/^[a-zA-Z0-9\s\-\_]*$/mu';
        $return = $_this->_check();

        if (!$return) {
            $_this->regex = '/^[\p{Ll}\p{Lm}\p{Lo}\p{Lt}\p{Lu}\p{Nd}\s\-\_]+$/mu';
            $return = $_this->_check();
        }

        return $return;
    }

    /**
     * Checks that a string length is within s specified range.
     * Spaces are included in the character count.
     * Returns true is string matches value min, max, or between min and max,
     *
     * @param string $check Value to check for length
     * @param integer $min Minimum value in range (inclusive)
     * @param integer $max Maximum value in range (inclusive)
     * @return boolean Success
     * @access public
     */
    function between($check, $min, $max) {
        $length = strlen($check);
        return ($length >= $min && $length <= $max);
    }

    /**
     * Returns true if field is left blank -OR- only whitespace characters are present in it's value
     * Whitespace characters include Space, Tab, Carriage Return, Newline
     *
     * $check can be passed as an array:
     * array('check' => 'valueToCheck');
     *
     * @param mixed $check Value to check
     * @return boolean Success
     * @access public
     */
    function blank($check) {
        $_this = &WPToolset_Cake_Validation::getInstance();
        $_this->__reset();
        $_this->check = $check;

        if (is_array($check)) {
            $_this->_extract($check);
        }

        $_this->regex = '/[^\\s]/';
        return !$_this->_check();
    }

    /**
     * Validation of credit card numbers.
     * Returns true if $check is in the proper credit card format.
     *
     * @param mixed $check credit card number to validate
     * @param mixed $type 'all' may be passed as a sting, defaults to fast which checks format of most major credit cards
     *    if an array is used only the values of the array are checked.
     *    Example: array('amex', 'bankcard', 'maestro')
     * @param boolean $deep set to true this will check the Luhn algorithm of the credit card.
     * @param string $regex A custom regex can also be passed, this will be used instead of the defined regex values
     * @return boolean Success
     * @access public
     * @see WPToolset_Cake_Validation::_luhn()
     */
    function cc($check, $type = 'fast', $deep = false, $regex = null) {
        $_this = &WPToolset_Cake_Validation::getInstance();
        $_this->__reset();
        $_this->check = $check;
        $_this->type = $type;
        $_this->deep = $deep;
        $_this->regex = $regex;

        if (is_array($check)) {
            $_this->_extract($check);
        }
        $_this->check = str_replace(array('-', ' '), '', $_this->check);

        if (strlen($_this->check) < 13) {
            return false;
        }

        if (!is_null($_this->regex)) {
            if ($_this->_check()) {
                return $_this->_luhn();
            }
        }
        $cards = array(
            'all' => array(
                'amex' => '/^3[4|7]\\d{13}$/',
                'bankcard' => '/^56(10\\d\\d|022[1-5])\\d{10}$/',
                'diners' => '/^(?:3(0[0-5]|[68]\\d)\\d{11})|(?:5[1-5]\\d{14})$/',
                'disc' => '/^(?:6011|650\\d)\\d{12}$/',
                'electron' => '/^(?:417500|4917\\d{2}|4913\\d{2})\\d{10}$/',
                'enroute' => '/^2(?:014|149)\\d{11}$/',
                'jcb' => '/^(3\\d{4}|2100|1800)\\d{11}$/',
                'maestro' => '/^(?:5020|6\\d{3})\\d{12}$/',
                'mc' => '/^5[1-5]\\d{14}$/',
                'solo' => '/^(6334[5-9][0-9]|6767[0-9]{2})\\d{10}(\\d{2,3})?$/',
                'switch' => '/^(?:49(03(0[2-9]|3[5-9])|11(0[1-2]|7[4-9]|8[1-2])|36[0-9]{2})\\d{10}(\\d{2,3})?)|(?:564182\\d{10}(\\d{2,3})?)|(6(3(33[0-4][0-9])|759[0-9]{2})\\d{10}(\\d{2,3})?)$/',
                'visa' => '/^4\\d{12}(\\d{3})?$/',
                'voyager' => '/^8699[0-9]{11}$/'
            ),
            'fast' => '/^(?:4[0-9]{12}(?:[0-9]{3})?|5[1-5][0-9]{14}|6011[0-9]{12}|3(?:0[0-5]|[68][0-9])[0-9]{11}|3[47][0-9]{13})$/'
        );

        if (is_array($_this->type)) {
            foreach ($_this->type as $value) {
                $_this->regex = $cards['all'][strtolower($value)];

                if ($_this->_check()) {
                    return $_this->_luhn();
                }
            }
        } elseif ($_this->type == 'all') {
            foreach ($cards['all'] as $value) {
                $_this->regex = $value;

                if ($_this->_check()) {
                    return $_this->_luhn();
                }
            }
        } else {
            $_this->regex = $cards['fast'];

            if ($_this->_check()) {
                return $_this->_luhn();
            }
        }
    }

    /**
     * Used to compare 2 numeric values.
     *
     * @param mixed $check1 if string is passed for a string must also be passed for $check2
     *    used as an array it must be passed as array('check1' => value, 'operator' => 'value', 'check2' -> value)
     * @param string $operator Can be either a word or operand
     *    is greater >, is less <, greater or equal >=
     *    less or equal <=, is less <, equal to ==, not equal !=
     * @param integer $check2 only needed if $check1 is a string
     * @return boolean Success
     * @access public
     */
    function comparison($check1, $operator = null, $check2 = null) {
        if (is_array($check1)) {
            extract($check1, EXTR_OVERWRITE);
        }
        $operator = str_replace(array(' ', "\t", "\n", "\r", "\0", "\x0B"), '', strtolower($operator));

        switch ($operator) {
            case 'isgreater':
            case '>':
                if ($check1 > $check2) {
                    return true;
                }
                break;
            case 'isless':
            case '<':
                if ($check1 < $check2) {
                    return true;
                }
                break;
            case 'greaterorequal':
            case '>=':
                if ($check1 >= $check2) {
                    return true;
                }
                break;
            case 'lessorequal':
            case '<=':
                if ($check1 <= $check2) {
                    return true;
                }
                break;
            case 'equalto':
            case '==':
                if ($check1 == $check2) {
                    return true;
                }
                break;
            case 'notequal':
            case '!=':
                if ($check1 != $check2) {
                    return true;
                }
                break;
            default:
                $_this = &WPToolset_Cake_Validation::getInstance();
                $_this->errors[] = __('You must define the $operator parameter for WPToolset_Cake_Validation::comparison()', 'wpcf');
                break;
        }
        return false;
    }

    /**
     * Used when a custom regular expression is needed.
     *
     * @param mixed $check When used as a string, $regex must also be a valid regular expression.
     * 								As and array: array('check' => value, 'regex' => 'valid regular expression')
     * @param string $regex If $check is passed as a string, $regex must also be set to valid regular expression
     * @return boolean Success
     * @access public
     */
    function custom($check, $regex = null) {
        $_this = &WPToolset_Cake_Validation::getInstance();
        $_this->__reset();
        $_this->check = $check;
        $_this->regex = $regex;
        if (is_array($check)) {
            $_this->_extract($check);
        }
        if ($_this->regex === null) {
            $_this->errors[] = __('You must define a regular expression for WPToolset_Cake_Validation::custom()', 'wpcf');
            return false;
        }
        return $_this->_check();
    }

    /**
     * Date validation, determines if the string passed is a valid date.
     * keys that expect full month, day and year will validate leap years
     *
     * @param string $check a valid date string
     * @param mixed $format Use a string or an array of the keys below. Arrays should be passed as array('dmy', 'mdy', etc)
     * 					Keys: dmy 27-12-2006 or 27-12-06 separators can be a space, period, dash, forward slash
     * 							mdy 12-27-2006 or 12-27-06 separators can be a space, period, dash, forward slash
     * 							ymd 2006-12-27 or 06-12-27 separators can be a space, period, dash, forward slash
     * 							dMy 27 December 2006 or 27 Dec 2006
     * 							Mdy December 27, 2006 or Dec 27, 2006 comma is optional
     * 							My December 2006 or Dec 2006
     * 							my 12/2006 separators can be a space, period, dash, forward slash
     * @param string $regex If a custom regular expression is used this is the only validation that will occur.
     * @return boolean Success
     * @access public
     */
    function date($check, $format = 'ymd', $regex = null) {

        if (is_numeric($check)) {
            return WPToolset_Field_Date_Scripts::_isTimestampInRange($check);
        }
        // TODO Change to use date strtotime
        $valid = wptoolset_strtotime($check);
        return $valid !== false;

        $cake_date_formats = array('F j, Y' => 'Mdy',
            'Y/m/d' => 'ymd',
            'm/d/Y' => 'mdy',
            'd/m/Y' => 'dmy'
        );
        $format = isset($cake_date_formats[$format]) ? $cake_date_formats[$format] : $format;

        $_this = &WPToolset_Cake_Validation::getInstance();
        $_this->__reset();
        $_this->check = $check;
        $_this->regex = $regex;

        if (!is_null($_this->regex)) {
            return $_this->_check();
        }

        $regex['dmy'] = '%^(?:(?:31(\\/|-|\\.|\\x20)(?:0?[13578]|1[02]))\\1|(?:(?:29|30)(\\/|-|\\.|\\x20)(?:0?[1,3-9]|1[0-2])\\2))(?:(?:1[6-9]|[2-9]\\d)?\\d{2})$|^(?:29(\\/|-|\\.|\\x20)0?2\\3(?:(?:(?:1[6-9]|[2-9]\\d)?(?:0[48]|[2468][048]|[13579][26])|(?:(?:16|[2468][048]|[3579][26])00))))$|^(?:0?[1-9]|1\\d|2[0-8])(\\/|-|\\.|\\x20)(?:(?:0?[1-9])|(?:1[0-2]))\\4(?:(?:1[6-9]|[2-9]\\d)?\\d{2})$%';
        $regex['mdy'] = '%^(?:(?:(?:0?[13578]|1[02])(\\/|-|\\.|\\x20)31)\\1|(?:(?:0?[13-9]|1[0-2])(\\/|-|\\.|\\x20)(?:29|30)\\2))(?:(?:1[6-9]|[2-9]\\d)?\\d{2})$|^(?:0?2(\\/|-|\\.|\\x20)29\\3(?:(?:(?:1[6-9]|[2-9]\\d)?(?:0[48]|[2468][048]|[13579][26])|(?:(?:16|[2468][048]|[3579][26])00))))$|^(?:(?:0?[1-9])|(?:1[0-2]))(\\/|-|\\.|\\x20)(?:0?[1-9]|1\\d|2[0-8])\\4(?:(?:1[6-9]|[2-9]\\d)?\\d{2})$%';
        $regex['ymd'] = '%^(?:(?:(?:(?:(?:1[6-9]|[2-9]\\d)?(?:0[48]|[2468][048]|[13579][26])|(?:(?:16|[2468][048]|[3579][26])00)))(\\/|-|\\.|\\x20)(?:0?2\\1(?:29)))|(?:(?:(?:1[6-9]|[2-9]\\d)?\\d{2})(\\/|-|\\.|\\x20)(?:(?:(?:0?[13578]|1[02])\\2(?:31))|(?:(?:0?[1,3-9]|1[0-2])\\2(29|30))|(?:(?:0?[1-9])|(?:1[0-2]))\\2(?:0?[1-9]|1\\d|2[0-8]))))$%';
        $regex['dMy'] = '/^((31(?!\\ (Feb(ruary)?|Apr(il)?|June?|(Sep(?=\\b|t)t?|Nov)(ember)?)))|((30|29)(?!\\ Feb(ruary)?))|(29(?=\\ Feb(ruary)?\\ (((1[6-9]|[2-9]\\d)(0[48]|[2468][048]|[13579][26])|((16|[2468][048]|[3579][26])00)))))|(0?[1-9])|1\\d|2[0-8])\\ (Jan(uary)?|Feb(ruary)?|Ma(r(ch)?|y)|Apr(il)?|Ju((ly?)|(ne?))|Aug(ust)?|Oct(ober)?|(Sep(?=\\b|t)t?|Nov|Dec)(ember)?)\\ ((1[6-9]|[2-9]\\d)\\d{2})$/';
        $regex['Mdy'] = '/^(?:(((Jan(uary)?|Ma(r(ch)?|y)|Jul(y)?|Aug(ust)?|Oct(ober)?|Dec(ember)?)\\ 31)|((Jan(uary)?|Ma(r(ch)?|y)|Apr(il)?|Ju((ly?)|(ne?))|Aug(ust)?|Oct(ober)?|(Sept|Nov|Dec)(ember)?)\\ (0?[1-9]|([12]\\d)|30))|(Feb(ruary)?\\ (0?[1-9]|1\\d|2[0-8]|(29(?=,?\\ ((1[6-9]|[2-9]\\d)(0[48]|[2468][048]|[13579][26])|((16|[2468][048]|[3579][26])00)))))))\\,?\\ ((1[6-9]|[2-9]\\d)\\d{2}))$/';
        $regex['My'] = '%^(Jan(uary)?|Feb(ruary)?|Ma(r(ch)?|y)|Apr(il)?|Ju((ly?)|(ne?))|Aug(ust)?|Oct(ober)?|(Sep(?=\\b|t)t?|Nov|Dec)(ember)?)[ /]((1[6-9]|[2-9]\\d)\\d{2})$%';
        $regex['my'] = '%^(((0[123456789]|10|11|12)([- /.])(([1][9][0-9][0-9])|([2][0-9][0-9][0-9]))))$%';

        $format = (is_array($format)) ? array_values($format) : array($format);
        foreach ($format as $key) {
            $_this->regex = $regex[$key];

            if ($_this->_check() === true) {
                return true;
            }
        }
        return false;
    }

    /**
     * Time validation, determines if the string passed is a valid time.
     * Validates time as 24hr (HH:MM) or am/pm ([H]H:MM[a|p]m)
     * Does not allow/validate seconds.
     *
     * @param string $check a valid time string
     * @return boolean Success
     * @access public
     */
    function time($check) {
        $_this = &WPToolset_Cake_Validation::getInstance();
        $_this->__reset();
        $_this->check = $check;
        $_this->regex = '%^((0?[1-9]|1[012])(:[0-5]\d){0,2}([AP]M|[ap]m))$|^([01]\d|2[0-3])(:[0-5]\d){0,2}$%';
        return $_this->_check();
    }

    /**
     * Boolean validation, determines if value passed is a boolean integer or true/false.
     *
     * @param string $check a valid boolean
     * @return boolean Success
     * @access public
     */
    function boolean($check) {
        $booleanList = array(0, 1, '0', '1', true, false);
        return in_array($check, $booleanList, true);
    }

    /**
     * Checks that a value is a valid decimal. If $places is null, the $check is allowed to be a scientific float
     * If no decimal point is found a false will be returned. Both the sign and exponent are optional.
     *
     * @param integer $check The value the test for decimal
     * @param integer $places if set $check value must have exactly $places after the decimal point
     * @param string $regex If a custom regular expression is used this is the only validation that will occur.
     * @return boolean Success
     * @access public
     */
    function decimal($check, $places = null, $regex = null) {
        $_this = &WPToolset_Cake_Validation::getInstance();
        $_this->__reset();
        $_this->regex = $regex;
        $_this->check = $check;

        if (is_null($_this->regex)) {
            if (is_null($places)) {
                $_this->regex = '/^[-+]?[0-9]*\\.{1}[0-9]+(?:[eE][-+]?[0-9]+)?$/';
            } else {
                $_this->regex = '/^[-+]?[0-9]*\\.{1}[0-9]{' . $places . '}$/';
            }
        }
        return $_this->_check();
    }

    /**
     * Validates for an email address.
     *
     * @param string $check Value to check
     * @param boolean $deep Perform a deeper validation (if true), by also checking availability of host
     * @param string $regex Regex to use (if none it will use built in regex)
     * @return boolean Success
     * @access public
     */
    function email($check, $deep = false, $regex = null) {
        $_this = &WPToolset_Cake_Validation::getInstance();
        $_this->__reset();
        $_this->check = $check;
        $_this->regex = $regex;
        $_this->deep = $deep;

        if (is_array($check)) {
            $_this->_extract($check);
        }

        if (is_null($_this->regex)) {
            $_this->regex = '/^[a-z0-9!#$%&\'*+\/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&\'*+\/=?^_`{|}~-]+)*@' . $_this->__pattern['hostname'] . '$/i';
        }
        $return = $_this->_check();

        if ($_this->deep === false || $_this->deep === null) {
            return $return;
        }

        if ($return === true && preg_match('/@(' . $_this->__pattern['hostname'] . ')$/i', $_this->check, $regs)) {
            if (function_exists('getmxrr') && getmxrr($regs[1], $mxhosts)) {
                return true;
            }
            if (function_exists('checkdnsrr') && checkdnsrr($regs[1], 'MX')) {
                return true;
            }
            return is_array(gethostbynamel($regs[1]));
        }
        return false;
    }

    /**
     * Check that value is exactly $comparedTo.
     *
     * @param mixed $check Value to check
     * @param mixed $comparedTo Value to compare
     * @return boolean Success
     * @access public
     */
    function equalTo($check, $comparedTo) {
        return ($check === $comparedTo);
    }

    /**
     * Check that value has a valid file extension.
     *
     * @param mixed $check Value to check
     * @param array $extensions file extenstions to allow
     * @return boolean Success
     * @access public
     */
    function extension($check, $extensions = array('gif', 'jpeg', 'png', 'jpg')) {
        //https://icanlocalize.basecamphq.com/projects/7393061-toolset/todo_items/188215131/comments
        if (!isset($check) || empty($check))
            return false;
        //##########################################################################################
        if (is_array($check)) {
            return WPToolset_Cake_Validation::extension(array_shift($check), $extensions);
        }
        if (!is_array($extensions)) {
            $extensions = explode('|', $extensions);
        }
        $check = strtolower($check);
        $extension = pathinfo($check, PATHINFO_EXTENSION);
        foreach ($extensions as $value) {
            if ($extension == strtolower($value)) {
                return true;
            }
        }
        return false;
    }

    /**
     * Validation of an IP address.
     *
     * Valid IP version strings for type restriction are:
     * - both: Check both IPv4 and IPv6, return true if the supplied address matches either version
     * - IPv4: Version 4 (Eg: 127.0.0.1, 192.168.10.123, 203.211.24.8)
     * - IPv6: Version 6 (Eg: ::1, 2001:0db8::1428:57ab)
     *
     * @param string $check The string to test.
     * @param string $type The IP Version to test against
     * @return boolean Success
     * @access public
     */
    function ip($check, $type = 'both') {
        $_this = &WPToolset_Cake_Validation::getInstance();
        $success = false;
        $type = strtolower($type);
        if ($type === 'ipv4' || $type === 'both') {
            $success |= $_this->_ipv4($check);
        }
        if ($type === 'ipv6' || $type === 'both') {
            $success |= $_this->_ipv6($check);
        }
        return $success;
    }

    /**
     * Validation of IPv4 addresses.
     *
     * @param string $check IP Address to test
     * @return boolean Success
     * @access protected
     */
    function _ipv4($check) {
        if (function_exists('filter_var')) {
            return filter_var($check, FILTER_VALIDATE_IP, array('flags' => FILTER_FLAG_IPV4)) !== false;
        }
        $this->__populateIp();
        $this->check = $check;
        $this->regex = '/^' . $this->__pattern['IPv4'] . '$/';
        return $this->_check();
    }

    /**
     * Validation of IPv6 addresses.
     *
     * @param string $check IP Address to test
     * @return boolean Success
     * @access protected
     */
    function _ipv6($check) {
        if (function_exists('filter_var')) {
            return filter_var($check, FILTER_VALIDATE_IP, array('flags' => FILTER_FLAG_IPV6)) !== false;
        }
        $this->__populateIp();
        $this->check = $check;
        $this->regex = '/^' . $this->__pattern['IPv6'] . '$/';
        return $this->_check();
    }

    /**
     * Checks whether the length of a string is greater or equal to a minimal length.
     *
     * @param string $check The string to test
     * @param integer $min The minimal string length
     * @return boolean Success
     * @access public
     */
    function minLength($check, $min) {
        $length = strlen($check);
        return ($length >= $min);
    }

    /**
     * Checks whether the length of a string is smaller or equal to a maximal length..
     *
     * @param string $check The string to test
     * @param integer $max The maximal string length
     * @return boolean Success
     * @access public
     */
    function maxLength($check, $max) {
        $length = strlen($check);
        return ($length <= $max);
    }

    /**
     * Checks that a value is a monetary amount.
     *
     * @param string $check Value to check
     * @param string $symbolPosition Where symbol is located (left/right)
     * @return boolean Success
     * @access public
     */
    function money($check, $symbolPosition = 'left') {
        $_this = &WPToolset_Cake_Validation::getInstance();
        $_this->check = $check;

        if ($symbolPosition == 'right') {
            $_this->regex = '/^(?!0,?\d)(?:\d{1,3}(?:([, .])\d{3})?(?:\1\d{3})*|(?:\d+))((?!\1)[,.]\d{2})?(?<!\x{00a2})\p{Sc}?$/u';
        } else {
            $_this->regex = '/^(?!\x{00a2})\p{Sc}?(?!0,?\d)(?:\d{1,3}(?:([, .])\d{3})?(?:\1\d{3})*|(?:\d+))((?!\1)[,.]\d{2})?$/u';
        }
        return $_this->_check();
    }

    /**
     * Validate a multiple select.
     *
     * Valid Options
     *
     * - in => provide a list of choices that selections must be made from
     * - max => maximun number of non-zero choices that can be made
     * - min => minimum number of non-zero choices that can be made
     *
     * @param mixed $check Value to check
     * @param mixed $options Options for the check.
     * @return boolean Success
     * @access public
     */
    function multiple($check, $options = array()) {
        $defaults = array('in' => null, 'max' => null, 'min' => null);
        $options = array_merge($defaults, $options);
        $check = array_filter((array) $check);
        if (empty($check)) {
            return false;
        }
        if ($options['max'] && count($check) > $options['max']) {
            return false;
        }
        if ($options['min'] && count($check) < $options['min']) {
            return false;
        }
        if ($options['in'] && is_array($options['in'])) {
            foreach ($check as $val) {
                if (!in_array($val, $options['in'])) {
                    return false;
                }
            }
        }
        return true;
    }

    /**
     * Checks if a value is numeric.
     *
     * @param string $check Value to check
     * @return boolean Succcess
     * @access public
     */
    function numeric($check) {
        return is_numeric($check);
    }

    /**
     * Checks if a value is integer.
     *
     * @param string $check Value to check
     * @return boolean Succcess
     * @access public
     */
    function integer($check) {
        return is_int(intval($check));
    }

    /**
     * Check that a value is a valid phone number.
     *
     * @param mixed $check Value to check (string or array)
     * @param string $regex Regular expression to use
     * @param string $country Country code (defaults to 'all')
     * @return boolean Success
     * @access public
     */
    function phone($check, $regex = null, $country = 'all') {
        $_this = &WPToolset_Cake_Validation::getInstance();
        $_this->check = $check;
        $_this->regex = $regex;
        $_this->country = $country;
        if (is_array($check)) {
            $_this->_extract($check);
        }

        if (is_null($_this->regex)) {
            switch ($_this->country) {
                case 'us':
                case 'all':
                case 'can':
                    // includes all NANPA members. see http://en.wikipedia.org/wiki/North_American_Numbering_Plan#List_of_NANPA_countries_and_territories
                    $_this->regex = '/^(?:\+?1)?[-. ]?\\(?[2-9][0-8][0-9]\\)?[-. ]?[2-9][0-9]{2}[-. ]?[0-9]{4}$/';
                    break;
            }
        }
        if (empty($_this->regex)) {
            return $_this->_pass('phone', $check, $country);
        }
        return $_this->_check();
    }

    /**
     * Checks that a given value is a valid postal code.
     *
     * @param mixed $check Value to check
     * @param string $regex Regular expression to use
     * @param string $country Country to use for formatting
     * @return boolean Success
     * @access public
     */
    function postal($check, $regex = null, $country = null) {
        $_this = &WPToolset_Cake_Validation::getInstance();
        $_this->check = $check;
        $_this->regex = $regex;
        $_this->country = $country;
        if (is_array($check)) {
            $_this->_extract($check);
        }
        if (empty($country)) {
            $_this->country = 'us';
        }

        if (is_null($_this->regex)) {
            switch ($_this->country) {
                case 'uk':
                    $_this->regex = '/\\A\\b[A-Z]{1,2}[0-9][A-Z0-9]? [0-9][ABD-HJLNP-UW-Z]{2}\\b\\z/i';
                    break;
                case 'ca':
                    $_this->regex = '/\\A\\b[ABCEGHJKLMNPRSTVXY][0-9][A-Z] ?[0-9][A-Z][0-9]\\b\\z/i';
                    break;
                case 'it':
                case 'de':
                    $_this->regex = '/^[0-9]{5}$/i';
                    break;
                case 'be':
                    $_this->regex = '/^[1-9]{1}[0-9]{3}$/i';
                    break;
                case 'us':
                    $_this->regex = '/\\A\\b[0-9]{5}(?:-[0-9]{4})?\\b\\z/i';
                    break;
            }
        }
        if (empty($_this->regex)) {
            return $_this->_pass('postal', $check, $country);
        }
        return $_this->_check();
    }

    /**
     * Validate that a number is in specified range.
     * if $lower and $upper are not set, will return true if
     * $check is a legal finite on this platform
     *
     * @param string $check Value to check
     * @param integer $lower Lower limit
     * @param integer $upper Upper limit
     * @return boolean Success
     * @access public
     */
    function range($check, $lower = null, $upper = null) {
        if (!is_numeric($check)) {
            return false;
        }
        if (isset($lower) && isset($upper)) {
            return ($check > $lower && $check < $upper);
        }
        return is_finite($check);
    }

    /**
     * Checks that a value is a valid Social Security Number.
     *
     * @param mixed $check Value to check
     * @param string $regex Regular expression to use
     * @param string $country Country
     * @return boolean Success
     * @access public
     */
    function ssn($check, $regex = null, $country = null) {
        $_this = &WPToolset_Cake_Validation::getInstance();
        $_this->check = $check;
        $_this->regex = $regex;
        $_this->country = $country;
        if (is_array($check)) {
            $_this->_extract($check);
        }

        if (is_null($_this->regex)) {
            switch ($_this->country) {
                case 'dk':
                    $_this->regex = '/\\A\\b[0-9]{6}-[0-9]{4}\\b\\z/i';
                    break;
                case 'nl':
                    $_this->regex = '/\\A\\b[0-9]{9}\\b\\z/i';
                    break;
                case 'us':
                    $_this->regex = '/\\A\\b[0-9]{3}-[0-9]{2}-[0-9]{4}\\b\\z/i';
                    break;
            }
        }
        if (empty($_this->regex)) {
            return $_this->_pass('ssn', $check, $country);
        }
        return $_this->_check();
    }

    /**
     * Checks that a value is a valid uuid - http://tools.ietf.org/html/rfc4122
     * 
     * @param string $check Value to check
     * @return boolean Success
     * @access public
     */
    function uuid($check) {
        $_this = &WPToolset_Cake_Validation::getInstance();
        $_this->check = $check;
        $_this->regex = '/^[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}$/i';
        return $_this->_check();
    }

    /**
     * Checks that a value is a valid URL according to http://www.w3.org/Addressing/URL/url-spec.txt
     *
     * The regex checks for the following component parts:
     *
     * - a valid, optional, scheme
     * - a valid ip address OR
     *   a valid domain name as defined by section 2.3.1 of http://www.ietf.org/rfc/rfc1035.txt
     *   with an optional port number
     * - an optional valid path
     * - an optional query string (get parameters)
     * - an optional fragment (anchor tag)
     *
     * @param string $check Value to check
     * @param boolean $strict Require URL to be prefixed by a valid scheme (one of http(s)/ftp(s)/file/news/gopher)
     * @return boolean Success
     * @access public
     */
    function url($check, $strict = false) {
        $_this = &WPToolset_Cake_Validation::getInstance();
        $_this->__populateIp();
        $_this->check = $check;
        $validChars = '([' . preg_quote('!"$&\'()*+,-.@_:;=~[]') . '\/0-9\p{L}\p{N}]|(%[0-9a-f]{2}))';
        $_this->regex = '/^(?:(?:https?|ftps?|sftp|file|news|gopher):\/\/)' . (!empty($strict) ? '' : '?') .
            '(?:' . $_this->__pattern['IPv4'] . '|\[' . $_this->__pattern['IPv6'] . '\]|' . $_this->__pattern['hostname'] . ')(?::[1-9][0-9]{0,4})?' .
            '(?:\/?|\/' . $validChars . '*)?' .
            '(?:\?' . $validChars . '*)?' .
            '(?:#' . $validChars . '*)?$/iu';
        return $_this->_check();
    }

    /**
     * Checks if a value is in a given list.
     *
     * @param string $check Value to check
     * @param array $list List to check against
     * @return boolean Succcess
     * @access public
     */
    function inList($check, $list) {
        return in_array($check, $list);
    }

    /**
     * Runs an user-defined validation.
     *
     * @param mixed $check value that will be validated in user-defined methods.
     * @param object $object class that holds validation method
     * @param string $method class method name for validation to run
     * @param array $args arguments to send to method
     * @return mixed user-defined class class method returns
     * @access public
     */
    function userDefined($check, $object, $method, $args = null) {
        return call_user_func_array(array(&$object, $method), array($check, $args));
    }

    function noSpecialChars($check) {
        return preg_match('#[^a-zA-Z0-9\s\_\-]#', $check) ? false : true;
    }

    function rewriteSlug($check) {
        return preg_match('#[^a-zA-Z0-9\s\_\-\%]#', $check) ? false : true;
    }

    /**
     * Attempts to pass unhandled Validation locales to a class starting with $classPrefix
     * and ending with Validation.  For example $classPrefix = 'nl', the class would be
     * `NlValidation`.
     *
     * @param string $method The method to call on the other class.
     * @param mixed $check The value to check or an array of parameters for the method to be called.
     * @param string $classPrefix The prefix for the class to do the validation.
     * @return mixed Return of Passed method, false on failure
     * @access protected
     * */
    function _pass($method, $check, $classPrefix) {
        $className = ucwords($classPrefix) . 'Validation';
        if (!class_exists($className)) {
            trigger_error(sprintf(__('Could not find %s class, unable to complete validation.', true), $className), E_USER_WARNING);
            return false;
        }
        if (!is_callable(array($className, $method))) {
            trigger_error(sprintf(__('Method %s does not exist on %s unable to complete validation.', true), $method, $className), E_USER_WARNING);
            return false;
        }
        $check = (array) $check;
        return call_user_func_array(array($className, $method), $check);
    }

    /**
     * Runs a regular expression match.
     *
     * @return boolean Success of match
     * @access protected
     */
    function _check() {
        $_this = &WPToolset_Cake_Validation::getInstance();
        if (preg_match($_this->regex, $_this->check)) {
            $_this->error[] = false;
            return true;
        } else {
            $_this->error[] = true;
            return false;
        }
    }

    /**
     * Get the values to use when value sent to validation method is
     * an array.
     *
     * @param array $params Parameters sent to validation method
     * @return void
     * @access protected
     */
    function _extract($params) {
        $_this = &WPToolset_Cake_Validation::getInstance();
        extract($params, EXTR_OVERWRITE);

        if (isset($check)) {
            $_this->check = $check;
        }
        if (isset($regex)) {
            $_this->regex = $regex;
        }
        if (isset($country)) {
            $_this->country = strtolower($country);
        }
        if (isset($deep)) {
            $_this->deep = $deep;
        }
        if (isset($type)) {
            $_this->type = $type;
        }
    }

    /**
     * Luhn algorithm
     *
     * @see http://en.wikipedia.org/wiki/Luhn_algorithm
     * @return boolean Success
     * @access protected
     */
    function _luhn() {
        $_this = &WPToolset_Cake_Validation::getInstance();
        if ($_this->deep !== true) {
            return true;
        }
        if ($_this->check == 0) {
            return false;
        }
        $sum = 0;
        $length = strlen($_this->check);

        for ($position = 1 - ($length % 2); $position < $length; $position += 2) {
            $sum += $_this->check[$position];
        }

        for ($position = ($length % 2); $position < $length; $position += 2) {
            $number = $_this->check[$position] * 2;
            $sum += ($number < 10) ? $number : $number - 9;
        }

        return ($sum % 10 == 0);
    }

    /*
     * Lazily popualate the IP address patterns used for validations
     *
     * @return void
     * @access private
     */

    function __populateIp() {
        if (!isset($this->__pattern['IPv6'])) {
            $pattern = '((([0-9A-Fa-f]{1,4}:){7}(([0-9A-Fa-f]{1,4})|:))|(([0-9A-Fa-f]{1,4}:){6}';
            $pattern .= '(:|((25[0-5]|2[0-4]\d|[01]?\d{1,2})(\.(25[0-5]|2[0-4]\d|[01]?\d{1,2})){3})';
            $pattern .= '|(:[0-9A-Fa-f]{1,4})))|(([0-9A-Fa-f]{1,4}:){5}((:((25[0-5]|2[0-4]\d|[01]?\d{1,2})';
            $pattern .= '(\.(25[0-5]|2[0-4]\d|[01]?\d{1,2})){3})?)|((:[0-9A-Fa-f]{1,4}){1,2})))|(([0-9A-Fa-f]{1,4}:)';
            $pattern .= '{4}(:[0-9A-Fa-f]{1,4}){0,1}((:((25[0-5]|2[0-4]\d|[01]?\d{1,2})(\.(25[0-5]|2[0-4]\d|[01]?\d{1,2}))';
            $pattern .= '{3})?)|((:[0-9A-Fa-f]{1,4}){1,2})))|(([0-9A-Fa-f]{1,4}:){3}(:[0-9A-Fa-f]{1,4}){0,2}';
            $pattern .= '((:((25[0-5]|2[0-4]\d|[01]?\d{1,2})(\.(25[0-5]|2[0-4]\d|[01]?\d{1,2})){3})?)|';
            $pattern .= '((:[0-9A-Fa-f]{1,4}){1,2})))|(([0-9A-Fa-f]{1,4}:){2}(:[0-9A-Fa-f]{1,4}){0,3}';
            $pattern .= '((:((25[0-5]|2[0-4]\d|[01]?\d{1,2})(\.(25[0-5]|2[0-4]\d|[01]?\d{1,2}))';
            $pattern .= '{3})?)|((:[0-9A-Fa-f]{1,4}){1,2})))|(([0-9A-Fa-f]{1,4}:)(:[0-9A-Fa-f]{1,4})';
            $pattern .= '{0,4}((:((25[0-5]|2[0-4]\d|[01]?\d{1,2})(\.(25[0-5]|2[0-4]\d|[01]?\d{1,2})){3})?)';
            $pattern .= '|((:[0-9A-Fa-f]{1,4}){1,2})))|(:(:[0-9A-Fa-f]{1,4}){0,5}((:((25[0-5]|2[0-4]';
            $pattern .= '\d|[01]?\d{1,2})(\.(25[0-5]|2[0-4]\d|[01]?\d{1,2})){3})?)|((:[0-9A-Fa-f]{1,4})';
            $pattern .= '{1,2})))|(((25[0-5]|2[0-4]\d|[01]?\d{1,2})(\.(25[0-5]|2[0-4]\d|[01]?\d{1,2})){3})))(%.+)?';

            $this->__pattern['IPv6'] = $pattern;
        }
        if (!isset($this->__pattern['IPv4'])) {
            $pattern = '(?:(?:25[0-5]|2[0-4][0-9]|(?:(?:1[0-9])?|[1-9]?)[0-9])\.){3}(?:25[0-5]|2[0-4][0-9]|(?:(?:1[0-9])?|[1-9]?)[0-9])';
            $this->__pattern['IPv4'] = $pattern;
        }
    }

    /**
     * Reset internal variables for another validation run.
     *
     * @return void
     * @access private
     */
    function __reset() {
        $this->check = null;
        $this->regex = null;
        $this->country = null;
        $this->deep = null;
        $this->type = null;
        $this->error = array();
        $this->errors = array();
    }

    public static function required($value) {
        return !( is_null($value) || $value === false || $value === '' );
    }

}
