<?php

require __DIR__ . '/vendor/autoload.php';

gc_enable();

use Movim\Bootstrap;
use Movim\RPC;
use Movim\Session;
use Movim\Scheduler;
use React\Promise\Timer;

use App\PresenceBuffer;

$loop = React\EventLoop\Loop::get();

$bootstrap = new Bootstrap;
$bootstrap->boot();

// DNS
$config = React\Dns\Config\Config::loadSystemConfigBlocking();
$server = $config->nameservers ? reset($config->nameservers) : '8.8.8.8';

$factory = new React\Dns\Resolver\Factory();
$dns = $factory->create($server);

// Scheduler
Scheduler::getInstance()->start();

// TCP Connector
$connector = null;

// We load and register all the widgets
$wrapper = \Movim\Widget\Wrapper::getInstance();
$wrapper->registerAll($bootstrap->getWidgets());

$xmppSocket = null;

$parser = new \Moxl\Parser(fn (\SimpleXMLElement $node) => \Moxl\Xec\Handler::handle($node));

$timestampReceive = $timestampSend = $sqlQueryExecuted = time();

function handleSSLErrors($errno, $errstr)
{
    logOut(colorize('SSL Error ' . $errno . ': ' . $errstr, 'red'));
}

// Temporary linker killer
$loop->addPeriodicTimer(5, function () use (&$xmppSocket, &$timestampReceive, &$timestampSend) {
    if (($timestampSend < time() - 3600 * 24 /* 24h */ || $timestampReceive < time() - 60 * 30 /* 30min */)
        && isset($xmppSocket)
    ) {
        $xmppSocket->close();
    }
});

// Buffer timers
$loop->addPeriodicTimer(1, function () {
    $pb = PresenceBuffer::getInstance();
    $pb->save();
});

$wsSocket = null;

function writeOut($msg = null)
{
    global $wsSocket;

    if (!empty($msg)) {
        $wsSocket->send(json_encode($msg));
    }
}

function logOut($log)
{
    fwrite(STDERR, colorize(getenv('sid'), 'yellow') . " : " . $log . "\n");
}

function writeXMPP($xml)
{
    global $xmppSocket;
    global $timestampSend;

    if (!empty($xml) && $xmppSocket) {
        $timestampSend = time();
        $xmppSocket->write(trim($xml));

        if (config('daemon.debug')) {
            logOut(colorize(trim($xml) . ' ', 'yellow') . colorize('sent to XMPP', 'green'));
        }
    }
}

function enableEncryption($connection)
{
    global $loop;

    $encryption = new \React\Socket\StreamEncryption($loop, false);
    logOut(colorize('Enable TLS on the socket', 'blue'));

    $session = Session::start();
    stream_context_set_option($connection->stream, 'ssl', 'SNI_enabled', true);
    stream_context_set_option($connection->stream, 'ssl', 'peer_name', $session->get('host'));
    stream_context_set_option($connection->stream, 'ssl', 'allow_self_signed', false);

    return $encryption->enable($connection)->then(
        fn () => logOut(colorize('TLS enabled', 'blue')),
        function ($error) use ($connection) {
            logOut(colorize('TLS error ' . $error->getMessage(), 'blue'));

            $evt = new Movim\Widget\Base;
            $evt->event('ssl_error');

            shutdown();
        }
    );
}

function handleClientDNS(array $results, $dns, $connector, $xmppBehaviour)
{
    global $loop;

    if (count($results) > 1) {
        $port = 5222;
        $directTLSSocket = false;

        if (
            $results['directtls'] !== false && $results['directtls'][0]['target'] !== '.'
            && $results['starttls'] !== false && $results['starttls'][0]['target'] !== '.'
        ) {
            if ($results['starttls'][0]['priority'] < $results['directtls'][0]['priority']) {
                $host = $results['starttls'][0]['target'];
                $port = $results['starttls'][0]['port'];
                logOut(colorize('Picked STARTTLS', 'blue'));
            } else {
                $host = $results['directtls'][0]['target'];
                $port = $results['directtls'][0]['port'];
                $directTLSSocket = true;
                logOut(colorize('Picked DirectTLS', 'blue'));
            }
        } elseif ($results['directtls'] !== false && $results['directtls'][0]['target'] !== '.') {
            $host = $results['directtls'][0]['target'];
            $port = $results['directtls'][0]['port'];
            $directTLSSocket = true;
            logOut(colorize('Picked DirectTLS', 'blue'));
        } elseif ($results['starttls'] !== false && $results['starttls'][0]['target'] !== '.') {
            $host = $results['starttls'][0]['target'];
            $port = $results['starttls'][0]['port'];
            logOut(colorize('Picked STARTTLS', 'blue'));
        } else {
            // No SRV, we fallback to the default host
            $session = Session::start();
            $host = $session->get('host');
        }

        $socket = 'tcp://';
        if ($directTLSSocket) $socket = 'tls://';
        $socket .= $host . ':' . $port;

        logOut(colorize('Connect to ' . $socket, 'blue'));

        $connector = new React\Socket\HappyEyeBallsConnector(
            $loop,
            new React\Socket\Connector([
                'timeout' => 5.0,
                'tls' => [
                    'SNI_enabled' => true,
                    'allow_self_signed' => false,
                    'peer_name' => $host
                ]
            ]),
            $dns
        );

        $connector->connect($socket)->then(
            $xmppBehaviour,
            function (\Exception $error) {
                logOut(colorize($error->getMessage(), 'red'));

                $evt = new Movim\Widget\Base;
                $evt->event('timeout_error');
                $this->cancel();
            }
        );
    }
}

function shutdown()
{
    global $loop;
    global $wsSocket;

    logOut(colorize('Shutdown', 'blue'));

    $wsSocket->close();
    $loop->stop();
}

$wsSocketBehaviour = function ($msg) use (&$xmppSocket, &$connector, &$xmppBehaviour, &$dns) {
    global $wsSocket;

    $msg = json_decode($msg);

    if (isset($msg)) {
        switch ($msg->func) {
            case 'message':
                (new RPC)->handleJSON($msg->b);
                break;

            case 'up':
            case 'down':
                if (
                    isset($xmppSocket)
                    && is_resource($xmppSocket->stream)
                ) {
                    $evt = new Movim\Widget\Base;
                    $evt->event('session_' . $msg->func);
                }
                break;

            case 'unregister':
                \Moxl\Stanza\Stream::end();
                if (isset($xmppSocket)) {
                    $xmppSocket->close();
                }
                shutdown();
                break;

            case 'register':
                // Set the host, useful for the CN certificate check
                $session = Session::start();

                // If the host is already set, we already launched the registration process
                if ($session->get('host')) {
                    return;
                } else {
                    $session->set('host', $msg->host);
                }

                global $loop;
                $results = [];

                Timer\timeout($dns->resolveAll('_xmpps-client._tcp.' . $msg->host, React\Dns\Model\Message::TYPE_SRV), 3.0, $loop)
                    ->then(
                        function ($resolved) use (&$results, &$dns, $connector, $xmppBehaviour) {
                            $results['directtls'] = $resolved;
                            handleClientDNS($results, $dns, $connector, $xmppBehaviour);
                        },
                        function ($rejected) use (&$results, &$dns, $connector, $xmppBehaviour) {
                            $results['directtls'] = false;
                            handleClientDNS($results, $dns, $connector, $xmppBehaviour);
                        }
                    );

                Timer\timeout($dns->resolveAll('_xmpp-client._tcp.' . $msg->host, React\Dns\Model\Message::TYPE_SRV), 3.0, $loop)
                    ->then(
                        function ($resolved) use (&$results, &$dns, $connector, $xmppBehaviour) {
                            $results['starttls'] = $resolved;
                            handleClientDNS($results, $dns, $connector, $xmppBehaviour);
                        },
                        function ($rejected) use (&$results, &$dns, $connector, $xmppBehaviour) {
                            $results['starttls'] = false;
                            handleClientDNS($results, $dns, $connector, $xmppBehaviour);
                        }
                    );

                break;
        }
    }

    return;
};

$xmppBehaviour = function (React\Socket\Connection $stream) use (&$xmppSocket, $parser, &$timestampReceive) {
    global $wsSocket;

    $xmppSocket = $stream;

    $evt = new Movim\Widget\Base;
    $evt->event('socket_connected');

    if (getenv('verbose')) {
        logOut(colorize('XMPP socket launched', 'blue'));
        logOut(" launched : " . \humanSize(memory_get_usage()));
    }

    $xmppSocket->on('data', function ($message) use (&$xmppSocket, $parser, &$timestampReceive) {
        if (!empty($message)) {

            if (config('daemon.debug')) {
                logOut(colorize($message . ' ', 'yellow') . colorize('received', 'green'));
            }

            if ($message == '</stream:stream>') {
                $xmppSocket->close();
                shutdown();
            } elseif (
                $message == "<proceed xmlns='urn:ietf:params:xml:ns:xmpp-tls'/>"
                || $message == '<proceed xmlns="urn:ietf:params:xml:ns:xmpp-tls"/>'
            ) {
                enableEncryption($xmppSocket)->then(
                    function () {
                        $session = Session::start();
                        \Moxl\Stanza\Stream::init($session->get('host'), $session->get('jid'));
                    },
                    function () {
                        return;
                    }
                );
            }

            $timestampReceive = time();

            if (!$parser->parse($message)) {
                logOut($parser->getError());
            }
        }
    });

    $xmppSocket->on('error', fn () => shutdown());
    $xmppSocket->on('close', fn () => shutdown());

    // And we say that we are ready !
    $obj = new \StdClass;
    $obj->func = 'registered';

    fwrite(STDERR, 'registered');
    $wsSocket->send(json_encode($obj));
};

$wsConnector = new \Ratchet\Client\Connector($loop);
$wsConnector('ws://127.0.0.1:' . getenv('port'), [], [
    'MOVIM_SESSION_ID' => getenv('sid'),
    'MOVIM_DAEMON_KEY' => getenv('key')
])->then(function (Ratchet\Client\WebSocket $socket) use (&$wsSocket, $wsSocketBehaviour) {
    $wsSocket = $socket;
    $wsSocket->on('message', $wsSocketBehaviour);
});

$loop->run();