<?php

namespace MGModule\DNSManager2\mgLibs\custom\dns\submodules;

use Exception;
use \MGModule\DNSManager2\mgLibs\custom\dns;
use MGModule\DNSManager2\mgLibs\custom\dns\dnssec\DnsSec;
use MGModule\DNSManager2\mgLibs\custom\dns\submodules\PowerDNSv4\RRSet;
use MGModule\DNSManager2\mgLibs\custom\dns\utils\Patterns;
use \MGModule\DNSManager2\mgLibs\custom\dns\exceptions;
use \MGModule\DNSManager2\mgLibs\custom\dns\interfaces;
use \MGModule\DNSManager2\mgLibs\custom\dns\record\Record;
use MGModule\DNSManager2\mgLibs\custom\helpers\IdnaHelper;

class PowerDNSV4 extends dns\SubmoduleAbstract implements
    interfaces\SubmoduleTTLInterface, interfaces\SubmoduleImportInterface, interfaces\SubmoduleRDNSInterface, interfaces\SubmoduleDNSSecInterface
{
    const ERR_WHILE_REMOVING = 'errRemovingRecord';
    const ERR_WHILE_CREATING  = 'errCreatingRecord';

    public $configFields = [
        'hostname'      => [
            'friendlyName' => 'Hostname/IP',
            'validators'   => [
                'required' => 'required',
            ]
        ],
        'port'          => [
            'friendlyName' => 'Default Port',
            'value'        => '8081'
        ],
        'ssl'          => [
            'friendlyName' => 'SSL',
            'type'         => 'yesno',
        ],
        'apikey'        => [
            'friendlyName' => 'API Key',
            'validators'   => [
                'required' => 'required',
            ]
        ],
        'domain_type'   => [
            'friendlyName' => 'Domain Type',
            'type'         => 'select',
            'options'      => ['MASTER' => 'MASTER', 'SLAVE' => 'SLAVE', 'NATIVE' => 'NATIVE'],
        ],
        'notify_slaves' => [
            'friendlyName' => 'Notify Slaves',
            'type'         => 'yesno',
        ],
        'zone_account'  => [
            'friendlyName' => 'Zone Account',
        ],
        'increment_soa_serial'=>[
            'friendlyName' => 'Manually Increment SOA Serial',
            'type'         => 'yesno',
        ],
        'default_ip'    => [
                'friendlyName'  =>  'Default IP',  
                'validators' => [
                    'required' => 'required',
                    'pattern' => Patterns::IP4_OR_IP6,
                ]
        ],
    ];

    public $availableTypes = ['MINFO', 'A', 'AAAA', 'NS', 'MX', 'CNAME', 'TXT', 'SRV', 'DNAME', 'SPF', 'PTR', 'ALIAS', 'AFSDB', 'HINFO', 'LOC', 'NAPTR', 'RP', 'CAA', 'SOA', 'DNSKEY', 'DS', 'RRSIG', 'URI', 'TLSA', 'SMIMEA', 'CERT', 'SSHFP', 'NSEC3PARAM', 'NSEC3', 'NSEC'];
    private $zoneID = false;

    private function get( $function, $params = [], $customRequest = null )
    {
        $headers[] = 'X-API-Key: ' . $this->config['apikey'];
        $port      = $this->config['port'] ? : 8081;

        $url = $this->config['ssl'] ? 'https' : 'http';
        $url       .= '://' . $this->config['hostname'] . ':' . $port . '/api/v1/' . $function;

        $this->log('REQUEST: ' . $url);

        $ch        = curl_init();
        $chOptions = [
            CURLOPT_URL            => trim($url),
            CURLOPT_RETURNTRANSFER => 1,
            CURLOPT_SSL_VERIFYPEER => 0,
            CURLOPT_SSL_VERIFYHOST => 0,
            CURLOPT_TIMEOUT        => 30,
            CURLOPT_HTTPHEADER     => $headers
        ];

        if ( $params )
        {
            $body = json_encode($params);
            $body = str_replace(
                [
                    ':{',
                    '},',
                    '}}',
                    '}],{'
                ],
                [
                    ':[{',
                    '}],',
                    '}]}',
                    '},{'
                ], $body);

            $chOptions[CURLOPT_POST]       = 1;
            $chOptions[CURLOPT_POSTFIELDS] = $body;
        }

        if ( $customRequest )
        {
            $chOptions[CURLOPT_CUSTOMREQUEST] = $customRequest;
        }
        curl_setopt_array($ch, $chOptions);
        $out = curl_exec($ch);

        $this->log('RESPONSE: ' . $out);

        if ( strpos($out, '"error"') !== false)
        {
            $out = json_decode($out);
            throw new exceptions\DNSSubmoduleException(str_replace('\032', ' ', $out->error), dns\SubmoduleExceptionCodes::INVALID_PARAMETERS);
        }
        if ( strpos($out, 'Unauthorized') !== false )
        {
            throw new exceptions\DNSSubmoduleException('Incorrect API Key', dns\SubmoduleExceptionCodes::CONNECTION_PROBLEM);
        }
        if ( curl_errno($ch) )
        {
            throw new exceptions\DNSSubmoduleException('cURL Error: ' . curl_errno($ch) . ' - ' . curl_error($ch), dns\SubmoduleExceptionCodes::COMMAND_ERROR);
        }
        $info = curl_getinfo($ch);
        if($info['http_code'] >= 300)
        {
            throw new exceptions\DNSSubmoduleException($this->parseHttpCodeError($info['http_code']), $info['http_code']);
        }
        curl_close($ch);
        return $out;
    }

    private function parseHttpCodeError($code)
    {
        switch($code)
        {
            case 400:
                $error = 'Bad request to the API';
                break;
            case 404:
                $error = 'API not enabled or invalid URL';
                break;
            default:
                $error = 'The server returned '.$code.' error';
        }
        return $error;
    }

    public function testConnection()
    {
        $out = $this->get('servers');
    }

    private function getServerID()
    {
        $out = json_decode($this->get('servers'));

        return $out[0]->id;
    }

    public function getZoneID()
    {
        if ( $this->zoneID !== false )
        {
            return $this->zoneID;
        }
        $serverId = $this->getServerID();
        
        try
        {
            $zone     = json_decode($this->get("servers/$serverId/zones/" . $this->domain, []));
        }
        catch (exceptions\DNSSubmoduleException $e)
        { 
            if($e->getCode() == 404)
            {
                throw new exceptions\DNSSubmoduleException('Zone does not exists', dns\SubmoduleExceptionCodes::INVALID_PARAMETERS);
            }
        }

        if ( isset($zone->id) )
        {
            $this->zoneID = (string)$zone->id;
            return (string)$zone->id;
        }
        throw new exceptions\DNSSubmoduleException('Zone does not exists', dns\SubmoduleExceptionCodes::INVALID_PARAMETERS);
    }

    public function zoneExists()
    {
        try
        {
            $this->getZoneID();
            return true;
        }
        catch (exceptions\DNSSubmoduleException $e)
        {
            if ( $e->getCode() === dns\SubmoduleExceptionCodes::INVALID_PARAMETERS )
            {
                return false;
            }
            throw $e;
        }
    }

    public function getRecords( $recordType = false )
    {
        $serverId = $this->getServerID();
        $zoneId   = $this->getZoneID();
        $rrsets   = json_decode($this->get("servers/$serverId/zones/$zoneId", []), false)->rrsets;
        $out      = [];
        $rrsets = array_filter($rrsets, [self::class, 'filterBrokenRRSets']);

        /** @var dns\submodules\PowerDNSv4\RRSet $rrset */
        foreach ( $rrsets as $rrset )
        {
            $type = $rrset->type;
            $name = $rrset->name;
            $ttl  = $rrset->ttl;

            $recordClass        = 'MGModule\\DNSManager2\\mgLibs\\custom\\dns\\record\\type\\' . $type;
            $recordAdapterClass = 'MGModule\\DNSManager2\\mgLibs\\custom\\dns\\submodules\\PowerDNSv4\\Adapters\\' . $type . 'Adapter';

            if ( ($recordType && $recordType !== $type) || !class_exists($recordClass) || !in_array($type, $this->availableTypes, true) ) continue;

            /** @var dns\submodules\PowerDNSv4\RecordFromServer $recordFromServer */
            foreach ( $rrset->records as $recordId => $recordFromServer )
            {
                if ( class_exists($recordAdapterClass) && method_exists($recordAdapterClass, 'createRdata') )
                {
                    /** @var dns\submodules\PowerDNSv4\Adapters\AbstractPowerDNSv4Adapter $record */
                    $record        = new $recordAdapterClass();
                    $record->name  = IdnaHelper::idnaEncode($name);
                    $record->type  = $type;
                    $record->line  = implode('|', [$name, $type, $recordId]);
                    $record->ttl   = $ttl;
                    $record->class = 'IN';

                    $record->createRdata(IdnaHelper::idnaDecode($recordFromServer->content));
                }
                else
                {
                    $record        = new Record();
                    $record->name  = IdnaHelper::idnaEncode($name);
                    $record->type  = $type;
                    $record->line  = implode('|', [$name, $type, $recordId]);
                    $record->ttl   = $ttl;
                    $record->class = 'IN';

                    $additionalProps = explode(' ', IdnaHelper::idnaDecode($recordFromServer->content));
                    $record->rdata   = new $recordClass();

                    foreach ( array_keys(get_object_vars($record->rdata)) as $index => $additionalProperty )
                    {
                        $record->rdata->$additionalProperty = $additionalProps[$index];
                    }
                }
                $out[] = $record;
            }
        }

        usort($out, static function ( $a, $b )
        {
            /** @var Record $a */
            /** @var Record $b */
            $recordAllignment = ['SOA', 'A', 'AAAA', 'NS', 'MX', 'TXT'];
            if ( !in_array($a->type, $recordAllignment, true) && !in_array($b->type, $recordAllignment, true) ) return 0;
            if ( !in_array($a->type, $recordAllignment, true) ) return 1;
            if ( !in_array($b->type, $recordAllignment, true) ) return -1;

            if ( $a->type === $b->type )
            {
                return $a->name < $b->name ? -1 : 1;
            }

            return array_search($a->type, $recordAllignment, true) < array_search($b->type, $recordAllignment, true) ? -1 : 1;
        });

        return $out;
    }

    /**
     * Generates Valid RRSet format for one record ( usefull when we can use replace function )
     *
     * @param Record $record
     * @param string $changetype
     *
     * @return array
     */
    private function recordToParamsArray( dns\record\Record $record, $changetype = 'REPLACE' )
    {
        return [
            'rrsets' => [
                'name'       => $record->name,
                'type'       => $record->type,
                'ttl'        => $record->ttl,
                'changetype' => $changetype,
                'comments'   => [],
                'records'    => [$this->formatRecordToPowerDnsFormat($record)]
            ]
        ];
    }

    /**
     * @param Record $record
     *
     * @throws exceptions\DNSSubmoduleException
     */
    public function addRecord( dns\record\Record $record )
    {
        $serverId = $this->getServerID();
        $zoneId   = $this->getZoneID();

        $records   = $this->getRecords();
        $record->name = IdnaHelper::idnaEncode($record->nameToAbsolute($this->domain));
        $records[] = $record;

        if( $this->config['increment_soa_serial'] === 'on' )
        {
            $records = $this->incrementSOASerial($records);
        }
        $params = $this->recordsToParamArray($records);
        $params = $this->replaceTargetRRSetTTL($params, $record);

        $this->get("servers/$serverId/zones/$zoneId", $params, 'PATCH');

        if ( $this->isSigned() )
        {
            $this->rectify();
        }

        $this->checkAndRunNotifySlaves($serverId, $zoneId);
    }

    public function editRecord( dns\record\Record $record )
    {
        $serverId = $this->getServerID();
        $zoneId   = $this->getZoneID();

        $record->nameToAbsolute($this->domain);
        $record->name = IdnaHelper::idnaEncode($record->name);

        $records = $this->getRecords();

        $recordsBeforeUpdate = $records;
        /** @var Record $records */
        foreach ( $records as $index => $recordBeforeUpdate )
        {
            if ( $recordBeforeUpdate->line === $record->line )
            {
                $records[$index] = $record;
                break;
            }
        }

        if( $this->config['increment_soa_serial'] === 'on' )
        {
            $records = $this->incrementSOASerial($records);
        }

        $params = $this->recordsToParamArray($records);
        $params = $this->replaceTargetRRSetTTL($params, $record);

        $errorType = null;
        try
        {
            $this->removeRRsets($recordsBeforeUpdate);
        }
        catch( exceptions\DNSSubmoduleException $e )
        {
            $errorType = self::ERR_WHILE_REMOVING;
        }

        try
        {
            $this->get("servers/$serverId/zones/$zoneId", $params, 'PATCH');
        }
        catch( exceptions\DNSSubmoduleException $e )
        {
            $errorType = $errorType ? : self::ERR_WHILE_CREATING;
            $this->restoreOldRecords($recordsBeforeUpdate,$errorType);
        }

        if ( $this->isSigned() )
        {
            $this->rectify();
        }
    }

    public function deleteRecord( dns\record\Record $record )
    {
        if( $record->type === 'SOA' ) throw new exceptions\DNSSubmoduleException('You are not allowed to delete SOA record');
        $serverId = $this->getServerID();
        $zoneId   = $this->getZoneID();

        $record->nameToAbsolute($this->domain);
        $record->name = IdnaHelper::idnaEncode($record->name);
        $records = $this->getRecords();

        $recordsBeforeUpdate = $records;

        /** @var Record $records */
        foreach ( $records as $index => $recordBeforeUpdate )
        {
            if ( $recordBeforeUpdate->line === $record->line )
            {
                unset($records[$index]);
                break;
            }
        }

        $params = $this->recordsToParamArray($records);

        $errorType = null;
        try
        {
            $this->removeRRsets($recordsBeforeUpdate);
        }
        catch( exceptions\DNSSubmoduleException $e )
        {
            $errorType = self::ERR_WHILE_REMOVING;
        }

        try
        {
            $this->get("servers/$serverId/zones/$zoneId", $params, 'PATCH');
        }
        catch( exceptions\DNSSubmoduleException $e )
        {
            $errorType = $errorType ? : self::ERR_WHILE_CREATING;
            $this->restoreOldRecords($recordsBeforeUpdate, $errorType);
        }

        if ( $this->isSigned() )
        {
            $this->rectify();
        }

        $this->checkAndRunNotifySlaves($serverId, $zoneId);
    }

    public function activateZone( $dnsZoneName = false )
    {
        $serverId = $this->getServerID();
        $params   = [
            'name'        => rtrim($this->domain, '.') . '.',
            'kind'        => $this->config['domain_type'],
            'nameservers' => [],
        ];

        if ( !empty($this->config['zone_account']) )
        {
            $params['account'] = $this->config['zone_account'];
        }

        if ( $dnsZoneName )
        {
            $params['name'] = rtrim($dnsZoneName, '.') . '.';
        }

        return $this->get("servers/$serverId/zones", $params);
    }

    public function terminateZone()
    {
        $serverId = $this->getServerID();
        $zoneId   = $this->getZoneID();

        $this->get("servers/$serverId/zones/$zoneId", [], 'DELETE');
    }

    public function getZones()
    {
        $serverId = $this->getServerID();
        $ret      = json_decode($this->get("servers/$serverId/zones", []));

        $out = [];
        foreach ( $ret as $zone )
        {
            $masters = null;
            if ( !empty($zone->masters) )
            {
                $masters = implode(', ', $zone->masters);
            }
            $out[substr((string)$zone->name, 0, -1)] = $masters;
        }

        return $out;
    }

    public function updateRDNS( $ip, $ttl = false, $value = false )
    {
        $revDnsZoneName = dns\utils\ReverseDNSHelper::reverseZoneName($ip);
        $zoneId         = $this->getRevDNSZoneID($revDnsZoneName);
        $serverId       = $this->getServerID();
        if ( !$zoneId )
        {
            $this->activateZone($revDnsZoneName);
            $zoneId = $this->getRevDNSZoneID($revDnsZoneName);
        }

        //We don't allow to replace name of the rdns record so we can simply use patch
        $revRecord = $this->createPowerDnsPTRRecord($ip, $ttl, $value, $revDnsZoneName);

        $this->get("servers/$serverId/zones/$zoneId", $this->recordToParamsArray($revRecord), 'PATCH');

        $this->checkAndRunNotifySlaves($serverId, $zoneId);
    }

    private function createPowerDnsPTRRecord( $ip, $ttl, $value, $dnsZoneName )
    {
        $record                  = new Record();
        $record->name            = $this->getLastPartOfIp($ip, true) . rtrim($dnsZoneName, '.') . '.';
        $record->ttl             = $ttl;
        $record->type            = 'PTR';
        $record->rdata           = new dns\record\type\PTR();
        $record->rdata->ptrdname = $value;

        return $record;
    }

    public function removeRDNS( $ip )
    {
        $revDnsZoneName = dns\utils\ReverseDNSHelper::reverseZoneName($ip);
        $zoneId         = $this->getRevDNSZoneID($revDnsZoneName);

        if ( !$zoneId )
        {
            return false;
        }
        $record = $this->getRDNSRecord($ip);

        if ( $record === false )
        {
            return false;
        }
        $this->deleteRecord($record);
        return true;
    }

    private function getLastPartOfIp( $ip, $withDot = false )
    {
        $ipLastPart = dns\utils\ReverseDNSHelper::reverseRecordName($ip);
        return $withDot ? $ipLastPart . '.' : $ipLastPart;
    }

    public function getRDNSRecord( $ip )
    {
        $clonedZone = $this->getClone($ip);
        $records    = $clonedZone->getRecords('PTR');

        $revZoneName = $this->getLastPartOfIp($ip, true) . rtrim(dns\utils\ReverseDNSHelper::reverseZoneName($ip), '.') . '.';

        foreach ( $records as $record )
        {
            if ( $record->name === $revZoneName ) return $record;
        }

        return false;
    }

    private function getRevDNSZoneID( $zoneName )
    {
        $zoneName = rtrim($zoneName, '.') . '.';
        $serverId = $this->getServerID();
        $out      = json_decode($this->get("servers/$serverId/zones", []));
        foreach ( $out as $zone )
        {
            if ( $zone->name === $zoneName )
            {
                $this->zoneID = (string)$zone->id;
                return (string)$zone->id;
            }
        }

        return false;
    }

    private function checkAndRunNotifySlaves( $serverID = null, $zoneID = null )
    {
        if ( $serverID !== null && $zoneID !== null && $this->config['notify_slaves'] === 'on' )
        {
            $this->get('servers/' . $serverID . '/zones/' . $zoneID . '/notify', [], 'PUT');
        }
    }

    //DNS SEC

    public function getSignKeys()
    {
        $dnssec   = new \MGModule\DNSManager2\mgLibs\custom\dns\dnssec\DnsSec();
        $serverId = $this->getServerID();
        $zoneId   = $this->getZoneID();
        $ret      = json_decode($this->get("servers/$serverId/zones/$zoneId/cryptokeys", []));

        foreach ( $ret as $record )
        {
            foreach ( $record->ds as $dsRecord )
            {
                $ex = explode(' ', $dsRecord);
                $ds = new dns\record\type\DS();
                $ds->setKeytag($ex[0]);
                $ds->setAlgorithm($ex[1]);
                $ds->setDigestType($ex[2]);
                $ds->setDigest($ex[3]);
                $dnssec->addDs($ds);
            }

            switch ( strtolower($record->keytype) )
            {
                case 'csk':
                    $dnsKeyEx = explode(' ', $record->dnskey);

                    $dnskey = new dns\record\type\DNSKEY();
                    $dnskey->setFlags($dnsKeyEx[0]);
                    $dnskey->setProtocol($dnsKeyEx[1]);
                    $dnskey->setAlgorithm($dnsKeyEx[2]);
                    $dnskey->setPublicKey($dnsKeyEx[3]);

                    $zoneKey = new dns\dnssec\CSK();
                    $zoneKey->setId($record->id);
                    $zoneKey->setBits($record->bits);
                    $zoneKey->setDnsKey($dnskey);

                    $dnssec->addKey($zoneKey);
                    break;
                case 'ksk':
                case 'zsk':
                    $dnsKeyEx = explode(' ', $record->dnskey);

                    $dnskey = new dns\record\type\DNSKEY();
                    $dnskey->setFlags($dnsKeyEx[0]);
                    $dnskey->setProtocol($dnsKeyEx[1]);
                    $dnskey->setAlgorithm($dnsKeyEx[2]);
                    $dnskey->setPublicKey($dnsKeyEx[3]);

                    $dnskey2 = new dns\record\type\DNSKEY();
                    $dnskey2->setFlags($dnsKeyEx[0]);
                    $dnskey2->setProtocol($dnsKeyEx[1]);
                    $dnskey2->setAlgorithm($dnsKeyEx[2]);

                    $ksk = new dns\dnssec\KSK();
                    $ksk->setId($record->id);
                    $ksk->setBits($record->bits);
                    $ksk->setDnsKey($dnskey);

                    $zsk = new dns\dnssec\ZSK();
                    $zsk->setId($record->id);
                    $zsk->setBits($record->bits);
                    $zsk->setDnsKey($dnskey2);

                    $dnssec->addKey($ksk);
                    $dnssec->addKey($zsk);
                    break;
            }
        }

        return $dnssec;
    }

    /**
     * Sign DNS zone
     */
    public function sign()
    {
        $this->changeStatus(true);
    }

    /**
     * Unsign DNS zone
     */
    public function unsign()
    {
        $this->changeStatus(false);
    }

    private function changeStatus( $status = true, $dnsZoneName = null )
    {
        $serverId = $this->getServerID();
        $zoneId   = $this->getZoneID();
        $params   = [
            'dnssec' => (boolean)$status,
        ];

        if ( $dnsZoneName )
        {
            $params['name'] = rtrim($dnsZoneName, '.') . '.';
        }

        $this->get("servers/$serverId/zones/$zoneId", $params, 'PUT');
    }

    /**
     * Rectify DNS zone
     */
    public function rectify()
    {
        $serverId = $this->getServerID();
        $zoneId   = $this->getZoneID();
        $this->get("servers/$serverId/zones/$zoneId/rectify", [], 'PUT');
    }

    /**
     *
     */
    public function isSigned()
    {
        try
        {
            $serverId = $this->getServerID();
            $zoneId   = $this->getZoneID();
            return json_decode($this->get("servers/$serverId/zones/$zoneId", []))->dnssec;
        }
        catch ( Exception $ex)
        {
            return false;
        }
    }

    /**
     * Creates rrsets structure from Records array
     * @param array  $records
     * @param string $changeType
     * @return mixed
     */
    private function recordsToParamArray( $records, $changeType = 'REPLACE')
    {
        $names = $this->getUniqueNames($records);
        $types = $this->getUniqueTypes($records);

        if( $changeType === 'DELETE' )
        {
            $types = array_diff($types, ['SOA']);
        }

        $out   = ['rrsets' => []];

        foreach ( $names as $name )
        {
            foreach ( $types as $type )
            {
                $rrset             = new RRSet();
                $rrset->name       = $name;
                $rrset->type       = $type;
                $rrset->ttl        = $this->getRRSetTTL($name, $type, $records);
                $rrset->changetype = $changeType;
                $rrset->comments   = [];
                $rrset->records    = $this->getRRsetForNameAndType($name, $type, $records);
                if ( $rrset->records )
                {
                    $out['rrsets'][] = $rrset;
                }
            }
        }
        return $out;
    }

    /**
     * @param array $records
     * @return array
     */
    private function getUniqueNames( $records )
    {
        $names = [];
        /** @var Record $record */
        foreach ( $records as $record )
        {
            $names[] = $record->name;
        }

        return array_unique($names);
    }

    /**
     * @param array $records
     * @return array
     */
    private function getUniqueTypes( $records )
    {
        $types = [];
        /** @var Record $record */
        foreach ( $records as $record )
        {
            $types[] = $record->type;
        }

        return array_unique($types);
    }

    /**
     * @param $name
     * @param $type
     * @param $records
     * @return array
     */
    private function getRRsetForNameAndType( $name, $type, $records )
    {
        $out = [];
        foreach ( $records as $record )
        {
            if ( $record->name === $name && $record->type === $type )
            {
                $out[] = $this->formatRecordToPowerDnsFormat($record);
            }
        }
        return $out;
    }

    /**
     * @param Record $record
     * @return array
     */
    private function formatRecordToPowerDnsFormat( Record $record )
    {
        $recordAdapterClass = 'MGModule\\DNSManager2\\mgLibs\\custom\\dns\\submodules\\PowerDNSv4\\Adapters\\' . $record->type . 'Adapter';
        if ( class_exists($recordAdapterClass) && method_exists($recordAdapterClass, 'parseContentToApiFormat') )
        {
            $content = (new $recordAdapterClass)->parseContentToApiFormat($record->rdata);
        }
        else
        {
            $content = str_replace("\t",' ',$record->rdata->toString());
        }
        return ['content' => $content, 'disabled' => false];
    }

    /**
     * Function removes all RRsets from server
     * It's easier when we remove all and then add all since we can't update single record cuz REPLACE duplicates record
     * @param $records
     * @return bool
     * @throws exceptions\DNSSubmoduleException
     */
    private function removeRRsets( $records )
    {
        $serverId = $this->getServerID();
        $zoneId   = $this->getZoneID();

        $removeParams = $this->recordsToParamArray($records, 'DELETE');
        $this->get("servers/$serverId/zones/$zoneId", $removeParams, 'PATCH');

        if( count($this->getRecords()) )
        {
            throw new exceptions\DNSSubmoduleException(self::ERR_WHILE_REMOVING);
        }

        return true;
    }

    /**
     * @param string $name
     * @param string $type
     * @param array  $records
     *
     * @return int
     */
    private function getRRSetTTL( $name, $type, array $records )
    {
        foreach( $records as $record )
        {
            if( $record->type === $type && $record->name === $name )
            {
                return $record->ttl;
            }
        }
        return 3600;
    }

    /**
     * @param array  $params
     * @param Record $record
     *
     * @return mixed
     */
    private function replaceTargetRRSetTTL( $params, Record $record )
    {
        /*** @var RRSet $rrset */
        foreach( $params['rrsets'] as $index => $rrset )
        {
            if( $rrset->name === $record->name && $rrset->type === $record->type )
            {
                $params['rrsets'][$index]->ttl = $record->ttl ?: 3600;
                return $params;
            }
        }
        return $params;
    }

    /**
     * @param array  $oldRecords
     * @param string $errorType
     *
     * @throws exceptions\DNSSubmoduleException
     */
    private function restoreOldRecords( $oldRecords, $errorType = self::ERR_WHILE_CREATING )
    {
        $serverId = $this->getServerID();
        $zoneId   = $this->getZoneID();
        $errors   = [];

        foreach( $oldRecords as $oldRecord )
        {
            try
            {
                $this->get("servers/$serverId/zones/$zoneId", $this->recordToParamsArray($oldRecord), 'PATCH');
            }
            catch( exceptions\DNSSubmoduleException $e )
            {
                $errors[] = $e->getMessage();
            }
        }

        if( count($errors) )
        {
            $msg = $errorType === self::ERR_WHILE_REMOVING ? 'Zone corrupted contact administrator. Affected records: ' : 'Couldn\'t create records: ';
            throw new exceptions\DNSSubmoduleException($msg . implode('<br />', $errors));
        }

    }

    /**
     * @param RRSet $rrset
     *
     * @return bool
     */
    private function filterBrokenRRSets( $rrset )
    {
        $domainToCheck = rtrim(IdnaHelper::idnaEncode($this->domain), ' .') . '.';
        return (bool)preg_match('/' . preg_quote($domainToCheck, '/') . '$/', $rrset->name);
    }

    /**
     * @param array $records
     *
     * @return array
     */
    public function incrementSOASerial( array $records )
    {
        /** @var Record $record */
        foreach( $records as &$record )
        {
            if( $record->type === 'SOA' )
            {
                $record->rdata->serial++;
                return $records;
            }
        }
    }
}