<?php
/**
 * @see Zend_Validate_Abstract
 */

/**
 * @category QS
 * @package Qs_Validate
 */
class Qs_Validate_Alias extends Zend_Validate_Abstract
{
    const NOT_MATCH = 'notMath';
    const NOT_UNIQUE = 'notUnique';

    protected $_messageTemplates = array(
        self::NOT_MATCH  => 'You have used unallowed symbols.
            Please note: the allowed ones are a-z, A-Z, 0-9, "-", "_", "."',
        self::NOT_UNIQUE => 'Alias must be unique'
    );

    protected $_pattern = '/^[-_a-zA-Z0-9\.]+$/';
    protected $_uniqueValidator;

    /**
     * Sets validator options
     * Accepts the following option keys (only for unique validation, default use Qs_Validate_Unique):
     *   'table'            => Qs_Db_Table object(current table)
     *   'column'           => column for validation
     *   'current'          => current value key
     *   'options'          => array options for Qs_Validate_Unique
     *   'uniqueValidator'  => another object validator for validating the unique
     *
     * Example:
     * <code>
     *      $form->alias->addValidator(
     *                  'Alias',
     *                   false,
     *                   array(
     *                      array(
     *                          'table'   => new Qs_Db_Table('table'),
     *                          'column'  => 'alias',
     *                          'current' => $this->_getData('id'),
     *                          'options' => array() //Additional options for default unique validator
     *                      )
     *                  )
     *              );
     * </code>
     * @param  array $options
     * @param  bool  $validateUnique If validate value for unique
     */
    public function __construct($options, $validateUnique = true)
    {
        if (array_key_exists('pattern', $options)) {
            $this->setPattern($options['pattern']);
            unset($options['pattern']);
        }
        if ($validateUnique) {
            if (array_key_exists('uniqueValidator', $options)) {
                $this->setUniqueValidator($options['uniqueValidator']);
            } elseif (array_key_exists('table', $options) && array_key_exists('column', $options)) {
                if (!$options['table'] instanceof Qs_Db_Table) {
                    throw new Zend_Validate_Exception('"table" options must be instance of Qs_Db_Table');
                }
                if (!empty($options['current'])) {
                    trigger_error('current - the option is deprecated for alias validator, please use currentId');
                    $options['currentId'] = $options['current'];
                }
                $uniqueValidator = new Qs_Validate_Unique(
                    $options['table'],
                    $options['column'],
                    (!empty($options['currentId'])?$options['currentId']:null),
                    (!empty($options['options'])?$options['options']:array())
                );
                $this->setUniqueValidator($uniqueValidator);
            }
        }
    }

    /**
     * Set validator object for unique validations
     *
     * @param Zend_Validate_Abstract $validator
     * @return Qs_Validate_Alias
     */
    public function setUniqueValidator($validator)
    {
        if (!$validator instanceof Zend_Validate_Abstract) {
            throw new Zend_Validate_Exception('Unique validator must be instance of Zend_Validate_Abstract');
        }
        $this->_uniqueValidator = $validator;
        return $this;
    }

    public function setPattern($pattern)
    {
        $this->_pattern = $pattern;
        return $this;
    }

    public function getPattern()
    {
        return $this->_pattern;
    }

    public function isValid($value)
    {
        $this->_setValue($value);
        $regexValidator = new Zend_Validate_Regex(array('pattern' => $this->getPattern()));
        $isValid = true;
        if (!$regexValidator->isValid($value)) {
            $this->_error(self::NOT_MATCH);
            $isValid = false;
        }
        if (!empty($this->_uniqueValidator)) {
            if (!$this->_uniqueValidator->isValid($value)) {
                $this->_error(self::NOT_UNIQUE);
                $isValid = false;
            }
        }
        return $isValid;
    }
}