<?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
 * @version    $Id$
 */


/**
 * @see Zend_Validate_Interface
 */
require_once 'Zend/Validate/Interface.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
 */
abstract class Zend_Validate_Abstract implements Zend_Validate_Interface
{
    /**
     * The value to be validated
     *
     * @var mixed
     */
    protected $_value;

    /**
     * Additional variables available for validation failure messages
     *
     * @var array
     */
    protected $_messageVariables = array();

    /**
     * Validation failure message template definitions
     *
     * @var array
     */
    protected $_messageTemplates = array();

    /**
     * Array of validation failure messages
     *
     * @var array
     */
    protected $_messages = array();

    /**
     * Flag indidcating whether or not value should be obfuscated in error 
     * messages
     * @var bool
     */
    protected $_obscureValue = false;

    /**
     * Array of validation failure message codes
     *
     * @var array
     * @deprecated Since 1.5.0
     */
    protected $_errors = array();

    /**
     * Translation object
     * @var Zend_Translate
     */
    protected $_translator;

    /**
     * Default translation object for all validate objects
     * @var Zend_Translate
     */
    protected static $_defaultTranslator;

    /**
     * Returns array of validation failure messages
     *
     * @return array
     */
    public function getMessages()
    {
        return $this->_messages;
    }

    /**
     * Returns an array of the names of variables that are used in constructing validation failure messages
     *
     * @return array
     */
    public function getMessageVariables()
    {
        return array_keys($this->_messageVariables);
    }

    /**
     * Sets the validation failure message template for a particular key
     *
     * @param  string $messageString
     * @param  string $messageKey     OPTIONAL
     * @return Zend_Validate_Abstract Provides a fluent interface
     * @throws Zend_Validate_Exception
     */
    public function setMessage($messageString, $messageKey = null)
    {
        if ($messageKey === null) {
            $keys = array_keys($this->_messageTemplates);
            $messageKey = current($keys);
        }
        if (!isset($this->_messageTemplates[$messageKey])) {
            require_once 'Zend/Validate/Exception.php';
            throw new Zend_Validate_Exception("No message template exists for key '$messageKey'");
        }
        $this->_messageTemplates[$messageKey] = $messageString;
        return $this;
    }

    /**
     * Sets validation failure message templates given as an array, where the array keys are the message keys,
     * and the array values are the message template strings.
     *
     * @param  array $messages
     * @return Zend_Validate_Abstract
     */
    public function setMessages(array $messages)
    {
        foreach ($messages as $key => $message) {
            $this->setMessage($message, $key);
        }
        return $this;
    }

    /**
     * Magic function returns the value of the requested property, if and only if it is the value or a
     * message variable.
     *
     * @param  string $property
     * @return mixed
     * @throws Zend_Validate_Exception
     */
    public function __get($property)
    {
        if ($property == 'value') {
            return $this->_value;
        }
        if (array_key_exists($property, $this->_messageVariables)) {
            return $this->{$this->_messageVariables[$property]};
        }
        /**
         * @see Zend_Validate_Exception
         */
        require_once 'Zend/Validate/Exception.php';
        throw new Zend_Validate_Exception("No property exists by the name '$property'");
    }

    /**
     * Constructs and returns a validation failure message with the given message key and value.
     *
     * Returns null if and only if $messageKey does not correspond to an existing template.
     *
     * If a translator is available and a translation exists for $messageKey, 
     * the translation will be used.
     *
     * @param  string $messageKey
     * @param  string $value
     * @return string
     */
    protected function _createMessage($messageKey, $value)
    {
        if (!isset($this->_messageTemplates[$messageKey])) {
            return null;
        }

        $message = $this->_messageTemplates[$messageKey];

        if (null !== ($translator = $this->getTranslator())) {
            if ($translator->isTranslated($message)) {
                $message = $translator->translate($message);
            } elseif ($translator->isTranslated($messageKey)) {
                $message = $translator->translate($messageKey);
            }
        }

        if ($this->getObscureValue()) {
            $value = str_repeat('*', strlen($value));
        }

        $message = str_replace('%value%', (string) $value, $message);
        foreach ($this->_messageVariables as $ident => $property) {
            $message = str_replace("%$ident%", $this->$property, $message);
        }
        return $message;
    }

    /**
     * @param  string $messageKey OPTIONAL
     * @param  string $value      OPTIONAL
     * @return void
     */
    protected function _error($messageKey = null, $value = null)
    {
        if ($messageKey === null) {
            $keys = array_keys($this->_messageTemplates);
            $messageKey = current($keys);
        }
        if ($value === null) {
            $value = $this->_value;
        }
        $this->_errors[]              = $messageKey;
        $this->_messages[$messageKey] = $this->_createMessage($messageKey, $value);
    }

    /**
     * Sets the value to be validated and clears the messages and errors arrays
     *
     * @param  mixed $value
     * @return void
     */
    protected function _setValue($value)
    {
        $this->_value    = $value;
        $this->_messages = array();
        $this->_errors   = array();
    }

    /**
     * Returns array of validation failure message codes
     *
     * @return array
     * @deprecated Since 1.5.0
     */
    public function getErrors()
    {
        return $this->_errors;
    }

    /**
     * Set flag indicating whether or not value should be obfuscated in messages
     * 
     * @param  bool $flag 
     * @return Zend_Validate_Abstract
     */
    public function setObscureValue($flag)
    {
        $this->_obscureValue = (bool) $flag;
        return $this;
    }

    /**
     * Retrieve flag indicating whether or not value should be obfuscated in 
     * messages
     * 
     * @return bool
     */
    public function getObscureValue()
    {
        return $this->_obscureValue;
    }

    /**
     * Set translation object
     * 
     * @param  Zend_Translate|Zend_Translate_Adapter|null $translator 
     * @return Zend_Validate_Abstract
     */
    public function setTranslator($translator = null)
    {
        if ((null === $translator) || ($translator instanceof Zend_Translate_Adapter)) {
            $this->_translator = $translator;
        } elseif ($translator instanceof Zend_Translate) {
            $this->_translator = $translator->getAdapter();
        } else {
            require_once 'Zend/Validate/Exception.php';
            throw new Zend_Validate_Exception('Invalid translator specified');
        }
        return $this;
    }

    /**
     * Return translation object
     * 
     * @return Zend_Translate_Adapter|null
     */
    public function getTranslator()
    {
        if (null === $this->_translator) {
            return self::getDefaultTranslator();
        }

        return $this->_translator;
    }

    /**
     * Set default translation object for all validate objects
     * 
     * @param  Zend_Translate|Zend_Translate_Adapter|null $translator 
     * @return void
     */
    public static function setDefaultTranslator($translator = null)
    {
        if ((null === $translator) || ($translator instanceof Zend_Translate_Adapter)) {
            self::$_defaultTranslator = $translator;
        } elseif ($translator instanceof Zend_Translate) {
            self::$_defaultTranslator = $translator->getAdapter();
        } else {
            require_once 'Zend/Validate/Exception.php';
            throw new Zend_Validate_Exception('Invalid translator specified');
        }
    }

    /**
     * Get default translation object for all validate objects
     * 
     * @return Zend_Translate_Adapter|null
     */
    public static function getDefaultTranslator()
    {
        if (null === self::$_defaultTranslator) {
            require_once 'Zend/Registry.php';
            if (Zend_Registry::isRegistered('Zend_Translate')) {
                $translator = Zend_Registry::get('Zend_Translate');
                if ($translator instanceof Zend_Translate_Adapter) {
                    return $translator;
                } elseif ($translator instanceof Zend_Translate) {
                    return $translator->getAdapter();
                }
            }
        }
        return self::$_defaultTranslator;
    }
}