<?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) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */


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


/**
 * @category   Zend
 * @package    Zend_Validate
 * @copyright  Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_Validate_Date extends Zend_Validate_Abstract
{
    /**
     * Validation failure message key for when the value does not follow the YYYY-MM-DD format
     */
    const NOT_YYYY_MM_DD = 'dateNotYYYY-MM-DD';

    /**
     * Validation failure message key for when the value does not appear to be a valid date
     */
    const INVALID        = 'dateInvalid';

    /**
     * Validation failure message key for when the value does not fit the given dateformat or locale
     */
    const FALSEFORMAT    = 'dateFalseFormat';

    /**
     * Validation failure message template definitions
     *
     * @var array
     */
    protected $_messageTemplates = array(
        self::NOT_YYYY_MM_DD => "'%value%' is not of the format YYYY-MM-DD",
        self::INVALID        => "'%value%' does not appear to be a valid date",
        self::FALSEFORMAT    => "'%value%' does not fit given date format"
    );

    /**
     * Optional format
     *
     * @var string|null
     */
    protected $_format;

    /**
     * Optional locale
     *
     * @var string|Zend_Locale|null
     */
    protected $_locale;

    /**
     * Sets validator options
     *
     * @param  string             $format OPTIONAL
     * @param  string|Zend_Locale $locale OPTIONAL
     * @return void
     */
    public function __construct($format = null, $locale = null)
    {
        $this->setFormat($format);
        $this->setLocale($locale);
    }

    /**
     * Returns the locale option
     *
     * @return string|Zend_Locale|null
     */
    public function getLocale()
    {
        return $this->_locale;
    }

    /**
     * Sets the locale option
     *
     * @param  string|Zend_Locale $locale
     * @return Zend_Validate_Date provides a fluent interface
     */
    public function setLocale($locale = null)
    {
        if ($locale !== null) {
            require_once 'Zend/Locale.php';
            if (!Zend_Locale::isLocale($locale)) {
                require_once 'Zend/Validate/Exception.php';
                throw new Zend_Validate_Exception("The locale '$locale' is no known locale");
            }
        }
        $this->_locale = $locale;
        return $this;
    }

    /**
     * Returns the locale option
     *
     * @return string|null
     */
    public function getFormat()
    {
        return $this->_format;
    }

    /**
     * Sets the format option
     *
     * @param  string $format
     * @return Zend_Validate_Date provides a fluent interface
     */
    public function setFormat($format = null)
    {
        $this->_format = $format;
        return $this;
    }

    /**
     * Defined by Zend_Validate_Interface
     *
     * Returns true if $value is a valid date of the format YYYY-MM-DD
     * If optional $format or $locale is set the date format is checked
     * according to Zend_Date, see Zend_Date::isDate()
     *
     * @param  string $value
     * @return boolean
     */
    public function isValid($value)
    {
        $valueString = (string) $value;

        $this->_setValue($valueString);

        if (($this->_format !== null) or ($this->_locale !== null)) {
            require_once 'Zend/Date.php';
            if (!Zend_Date::isDate($value, $this->_format, $this->_locale)) {
                $this->_error(self::FALSEFORMAT);
                return false;
            }
        } else {
            if (!preg_match('/^\d{4}-\d{2}-\d{2}$/', $valueString)) {
                $this->_error(self::NOT_YYYY_MM_DD);
                return false;
            }

            list($year, $month, $day) = sscanf($valueString, '%d-%d-%d');

            if (!checkdate($month, $day, $year)) {
                $this->_error(self::INVALID);
                return false;
            }
        }

        return true;
    }

}
