<?php
/**
 *    Copyright (C) 2018 Deciso B.V.
 *
 *    All rights reserved.
 *
 *    Redistribution and use in source and binary forms, with or without
 *    modification, are permitted provided that the following conditions are met:
 *
 *    1. Redistributions of source code must retain the above copyright notice,
 *       this list of conditions and the following disclaimer.
 *
 *    2. Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *
 *    THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
 *    INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 *    AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 *    AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
 *    OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 *    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 *    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 *    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 *    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 *    POSSIBILITY OF SUCH DAMAGE.
 *
 */
namespace OPNsense\Base\Constraints;

/**
 * Class DependConstraint, add a constraint to this field stating dependency of another field
 * (if this field is empty then the refered field should be empty too)
 * @package OPNsense\Base\Constraints
 */
class DependConstraint extends BaseConstraint
{
    /**
     * check if field is empty  (either boolean field as false or an empty field)
     */
    private function isEmpty($node)
    {
        $node_class = get_class($node);
        if ($node_class == "OPNsense\Base\FieldTypes\BooleanField") {
            return empty((string)$node);
        } elseif (empty((string)$node) || (string)$node == "0") {
            return true;
        }
        return false;
    }

    /**
     * Executes validation, expects a list of fields in "addFields" which to check for content.
     * Fields are concerned empty if boolean false or containing an empty string
     *
     * @param \Phalcon\Validation $validator
     * @param string $attribute
     * @return boolean
     */
    public function validate(\Phalcon\Validation $validator, $attribute)
    {
        $node = $this->getOption('node');
        if ($node) {
            $parentNode = $node->getParentNode();
            if ($this->isEmpty($node)) {
                foreach (array_unique($this->getOptionValueList('addFields')) as $fieldname) {
                    if (!$this->isEmpty($parentNode->$fieldname)) {
                        $this->appendMessage($validator, $attribute);
                        break;
                    }
                }
            }
        }
        return true;
    }
}
