<?php

namespace ThurData\Servers\KerioEmail\Core\Helper;
use ThurData\Servers\KerioEmail\Core\Models\Whmcs\Server;
use \WHMCS\Database\Capsule;

require_once '/usr/share/php/Net/DNS2.php';
use \Net\DNS2\Net_DNS2_Resolver as Net_DNS2_Resolver;

/**
 * Wrapper for WHMCS params passed to controler functions
 *
 * @autor ThurData <info@thurdata.ch>
 */
class DnsHelper
{
    use \ThurData\Servers\KerioEmail\Core\UI\Traits\WhmcsParams;

    public function __construct()
    {
        $this->params = $this->getWhmcsParamsByKeys(['domain', 'userid', 'serverhostname', 'serverusername', 'serverpassword', 'domainid', 'serverid', 'pid']);
        $this->server = Server::select('id', 'nameserver1ip', 'nameserver2ip')->findOrFail($this->params['serverid']);
        $this->nameserver = array(trim($this->server->nameserver1ip), trim($this->server->nameserver2ip));
//        $this->nameserver = array('127.0.0.1', '127.0.0.2'); //test
        $this->resolver = new \Net_DNS2_Resolver(array('nameservers' => $this->nameserver));
    }    

    /**
     * @param string $domain
     * @return array
     */

    public function getRecords($domain) {
        $zoneID = $this->selfDns($domain);
        if($zoneID) {
            return $this->getLocalRecords($zoneID);
        }
        return $this->getResolverRecords($domain);
    }
    
    private function selfDns($domain){
        $zoneIDcollection = Capsule::table('dns_manager2_zone')
            ->select('id')
            ->where('name', '=', $domain)
            ->get();
        $zoneIDobj = $zoneIDcollection[0];
        if(!isset($zoneIDobj->{'id'})) {
            return false;
        }
        return $zoneIDobj->{'id'};
    }

    private function getResolverRecords($domain)
    {
        $vars['mx'] = array();
        $vars['spf'] = array();
        $vars['dmarc'] = array();
        $vars['dkim'] = array();
        $vars['selfDNS'] = false;
        try {
            $responseMX = $this->resolver->query($domain, 'MX');
            $responseTXT = $this->resolver->query($domain, 'TXT');
            
        } catch(\Net_DNS2_Exception $e) {
                
                echo "::query() failed: ", $e->getMessage(), "\n";
        }
        $domainMX = $responseMX->answer;
        $domainTXT = $responseTXT->answer;
        foreach($domainMX as $mxRecord) {
            array_push($vars['mx'], $mxRecord->exchange);
        }
        foreach($domainTXT as $txtRecord) {
            foreach($txtRecord->text as $txtData) {
                if(strstr($txtData,'v=spf')) {
                    array_push($vars['spf'],$txtData);
                }
                if(strstr($txtData,'v=DMARC')) {
                    array_push($vars['dmarc'],$txtData);
                }
                if(strstr($txtData,'v=DKIM')) {
                    array_push($vars['dkim'],$txtData);
                }
            }
        }
        return $vars;
    }

    private function getLocalRecords($zoneID) {
        $vars['mx'] = array();
        $vars['spf'] = array();
        $vars['dmarc'] = array();
        $vars['dkim'] = array();
        $vars['selfdns'] = $zoneID;
        $dnsZone = localAPI('dnsmanager', array( 'dnsaction' => 'getZone', 'zone_id' => $zoneID));
        if($dnsZone['result'] != 'success') {
            return 'Error: cloud not fetch zone for ID ' . $zoneID;
        }
        foreach($dnsZone['data']->records as $localRecord) {
            if($localRecord->type == 'MX'){
                array_push($vars['mx'], $localRecord->rdata->exchange);
            }
            if($localRecord->type == 'TXT'){
                if(strstr($localRecord->rdata->txtdata,'v=spf')) {
                    array_push($vars['spf'], trim($localRecord->rdata->txtdata, '"'));
                }
                if(strstr($localRecord->rdata->txtdata,'v=DMARC')) {
                    array_push($vars['dmarc'], trim($localRecord->rdata->txtdata, '"'));
                }
                if(strstr($localRecord->rdata->txtdata,'v=DKIM')) {
                    array_push($vars['dkim'], trim($localRecord->rdata->txtdata, '"'));
                }
            }
        }
        return $vars;
    }

    public function updateDNS($zoneID,$dnsParams)
    {
        $dnsZone = localAPI('dnsmanager', array( 'dnsaction' => 'getZone', 'zone_id' => $zoneID));
        if($dnsZone['result'] != 'success') {
            return 'Error: cloud not fetch zone for ID ' . $zoneID;
        }
        $zoneRecords = array();
        $mxtargets = explode(' ', $dnsParams['mx']);
        $preference = 10;
        foreach($mxtargets as $mxtarget) {
            $mxRecord = array(
                'name' => '@',
                'type' => 'MX',
                'class' => 'IN',
                'data' => array(
                    'preference' => $preference,
                    'exchange' => $mxtarget,
                ),
            );
            array_push($zoneRecords, $mxRecord);
            $preference += 10;
        }
        $spfRecord = array(
            'name' => '@',
            'type' => 'TXT',
            'class' => 'IN',
            'data' => $dnsParams['spf']
        );
        array_push($zoneRecords, $spfRecord);
        $dmarcRecord = array(
            'name' => '@',
            'type' => 'TXT',
            'class' => 'IN',
            'data' => $dnsParams['dmarc']
        );
        array_push($zoneRecords, $dmarcRecord);
        $dkimRecord = array(
            'name' => $dnsParams['dkimname'],
            'type' => 'TXT',
            'class' => 'IN',
            'data' => $dnsParams['dkim']
        );
        array_push($zoneRecords, $dkimRecord);
        foreach($dnsZone['data']->records as $record) {
            if($record->type == 'MX') continue;
            if($record->type == 'SOA') continue;
            if($record->type === 'TXT') {
                // skip dmarc
                if(preg_match('/^v=DMARC1(.*)$/i', trim($record->rdata->txtdata,'"'))) continue; 
                // skip spf
                if(preg_match('/^v=spf(.*)$/i', trim($record->rdata->txtdata,'"'))) continue; 
                // skip dkim
                if($dnsParams['dkimname'] == $record->name) continue; 
            };
            if($record->type == 'NS'){
                $nsrecord = array(
                    'name' => '@',
                    'type' => 'NS',
                    'class' => 'IN',
                    'data' => $record->rdata->nsdname
                );
                $record = $nsrecord;
            }
            array_push($zoneRecords, $record);
        }

        logModuleCall(
            'kerioEmail',
            __FUNCTION__,
            $this->params,
            'DEbug',
            $zoneRecords
        );

        $result = localAPI('dnsmanager' ,
            array(
                'dnsaction' => 'updateZone',
                'zone_id' => $zoneID,
                'records' => $zoneRecords,
            )
        );
        if($result['result'] != 'success') {
            return 'Error: cloud not update zone for ID ' . $zoneID;
        }
        return 'success';
    }
    
    function KerioEmailunsetMX($maildomain)
    {
        $zoneIDcollection = Capsule::table('dns_manager2_zone')
            ->select('id')
            ->where('name', '=', $maildomain)
            ->get();
        $zoneIDobj = $zoneIDcollection[0];
        $zoneID = $zoneIDobj->{'id'};
        if(!isset($zoneID)) {
            return 'Error: zone ID not found for domain ' . $this->params['domain'];
        }
        $dnsZone = localAPI('dnsmanager', array( 'dnsaction' => 'getZone', 'zone_id' => $zoneID));
        if($dnsZone['result'] != 'success') {
            return 'Error: cloud not fetch zone for ID ' . $zoneID;
        }
        $zoneRecords = array();
        foreach($dnsZone['data']->records as $record) {
            if($record->type == 'MX') continue;
            array_push($zoneRecords, $record);
        }
        $result = localAPI('dnsmanager' ,
            array(
                'dnsaction' => 'updateZone',
                'zone_id' => $zoneID,
                'records' => $zoneRecords,
            )
        );
        if($result['result'] != 'success') {
            return 'Error: cloud not update zone for ID ' . $zoneID;
        }
        return 'success';
}

}