<?php

/*
 * Copyright (C) 2023 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\Kea\FieldTypes;

use OPNsense\Base\FieldTypes\BaseField;
use OPNsense\Base\Validators\CallbackValidator;
use OPNsense\Firewall\Util;

class KeaPoolsField extends BaseField
{
    /**
     * @var bool marks if this is a data node or a container
     */
    protected $internalIsContainer = false;

    /**
     * {@inheritdoc}
     */
    public function getValidators()
    {
        $validators = parent::getValidators();

        if ($this->internalValue != null) {
            $validators[] = new CallbackValidator(["callback" => function ($data) {
                $messages = [];
                foreach (explode("\n", $data) as $entry) {
                    if (!strlen($entry)) {
                        continue;
                    }
                    $parts = explode('-', $entry);
                    if (count($parts) == 2 && Util::isIpAddress(trim($parts[0])) && Util::isIpAddress(trim($parts[1]))) {
                        continue;
                    } elseif (count($parts) == 1 && Util::isSubnet($parts[0])) {
                        continue;
                    }
                    $messages[] = sprintf(gettext('Entry "%s" is not a valid range or subnet.'), $entry);
                }
                return $messages;
            }]);
        }

        return $validators;
    }

    /**
     * {@inheritdoc}
     */
    public function getValues(): array
    {
        return array_values(array_filter(explode("\n", $this->internalValue), function ($k) {
            return !!strlen($k);
        }));
    }

    /**
     * validate stored pools against a given subnet
     * @param string $subnet the given subnet
     * @return array of non-matching pools
     */
    public function checkSubnet($subnet)
    {
        $invalid = [];

        foreach ($this->getValues() as $pool) {
            $range = Util::isSubnet($pool) ? Util::cidrToRange($pool) : explode('-', $pool);
            foreach ($range as $addr) {
                if (!Util::isIPInCIDR(trim($addr), $subnet)) {
                    $invalid[] = $pool;
                }
            }
        }

        return $invalid;
    }
}
