<?php

declare(strict_types=1);

namespace Pfatt\Service;

use Psr\Log\LoggerAwareInterface;
use Psr\Log\LoggerInterface;
use Symfony\Component\Process\Process;

class NgCtl implements LoggerAwareInterface
{
    private LoggerInterface $logger;

    public function __construct(LoggerInterface $logger)
    {
        $this->logger = $logger;
    }

    /**
     * Use ngctl to check connection.
     */
    public function ngIsConnected(): bool
    {
        return $this->exec(['show', 'laneapfilter:eapout']);
    }

    /**
     * Remove the eapout connection between laneapfilter and waneapfilter.
     */
    public function ngRmHook(): void
    {
        $this->logger->info('Disconnecting netgraph node ...');
        $this->exec(['rmhook', 'laneapfilter:', 'eapout']) ?
            $this->logger->info('OK!') :
            $this->logger->error('ERROR!');
    }

    /**
     * Connect laneapfilter and waneapfilter with eapout.
     */
    public function ngConnect(): void
    {
        $this->logger->info('Connecting netgraph node ...');
        $this->exec(['connect', 'waneapfilter:', 'laneapfilter:', 'eapout', 'eapout']) ?
            $this->logger->info('OK!') :
            $this->logger->error('ERROR!');
    }

    /**
     * Use ngctl to setup virtual connection.
     *
     * @param string $ont
     *   ONT network connection interface.
     * @param string $rg
     *   Residential Gateway network connection interface.
     * @param string $rgMac
     *   Residential Gateway MAC address.
     * @return void
     */
    public function createNodes(string $ont, string $rg, string $rgMac): void
    {
        $this->logger->info('Building netgraph nodes.');

        $this->logger->info('   creating ng_one2many...');
        $this->exec(['mkpeer', $ont . ':', 'one2many', 'lower', 'one']);
        $this->exec(['name', $ont . ':lower', 'o2m']);
        $this->logger->info('OK!');

        $this->logger->info('   creating vlan node and interface...');
        $this->exec(['mkpeer', 'o2m:', 'vlan', 'many0', ' downstream']);
        $this->exec(['name', 'o2m:many0', 'vlan0']);
        $this->exec(['mkpeer', 'vlan0:', 'eiface', 'vlan0', 'ether']);
        $this->exec([
            'msg',
            'vlan0:',
            '\'addfilter { vlan=0 hook="vlan0" }\''
        ]);
        $this->exec(['msg', 'ngeth0:', 'set', $rgMac]);
        $this->logger->info('OK!');

        $this->logger->info("   defining etf for $ont (ONT)...");
        $this->exec(['mkpeer', 'o2m:', 'etf', 'many1', 'downstream']);
        $this->exec(['name', 'o2m:many1', 'waneapfilter']);
        $this->exec([
            'connect',
            'waneapfilter:',
            $ont . ':',
            'nomatch',
            'upper'
        ]);
        $this->logger->info('OK!');

        $this->logger->info("   defining etf for $rg (RG)...");
        $this->exec(['mkpeer', $rg . ':', 'etf', 'lower', 'downstream']);
        $this->exec(['name', $rg . ':', 'lower', 'laneapfilter']);
        $this->exec([
            'connect',
            'laneapfilter:',
            $rg . ':',
            'nomatch',
            'upper'
        ]);
        $this->logger->info('OK!');

        $this->logger->info("   bridging etf for $ont <-> $rg...");
        $this->exec([
            'connect',
            'waneapfilter:',
            'laneapfilter:',
            'eapout',
            'eapout'
        ]);
        $this->logger->info('OK!');

        $this->logger->info("   defining filters for EAP traffic...");
        $this->exec([
            'msg',
            'waneapfilter:',
            '\'setfilter { matchhook="eapout" ethertype=0x888e }\''
        ]);
        $this->exec([
            'msg',
            'laneapfilter:',
            '\'setfilter { matchhook="eapout" ethertype=0x888e }\''
        ]);
        $this->logger->info('OK!');

        $this->logger->info("   enabling one2many links...");
        $this->exec([
            'msg',
            'o2m:',
            'setconfig',
            '"{ xmitAlg=2 failAlg=1 enabledLinks=[ 1 1 ] }"'
        ]);
        $this->logger->info('OK!');

        $this->logger->info("   removing waneapfilter:nomatch hook...");
        $this->exec(['rmhook', 'waneapfilter:', 'nomatch']);
        $this->logger->info('OK!');
    }

    public function removeNodes(string $ont, string $rg): void
    {
        $this->exec(['shutdown', 'waneapfilter:']);
        $this->exec(['shutdown', 'laneapfilter:']);
        $this->exec(['shutdown', $ont . ':']);
        $this->exec(['shutdown', $rg . ':']);
        $this->exec(['shutdown', 'o2m:']);
        $this->exec(['shutdown', 'vlan0:']);
        $this->exec(['shutdown', 'ngeth0:']);
    }

    /**
     * Run a ngctl command.
     *
     * @param array<int, string> $args
     *   Additional arguments to pass to ngctl.
     *
     * @return bool
     *   True on success, false on failure.
     */
    private function exec(array $args): bool
    {
        $process = new Process(['/usr/sbin/ngctl', ...$args], '/tmp');
        return !$process->run();
    }

    /**
     * {@inheritDoc}
     */
    public function setLogger(LoggerInterface $logger): void
    {
        $this->logger = $logger;
    }
}