<?php
require_once('../vendor/autoload.php');
require_once('help.php'); // provides $help_texts


// initialize the Prometheus registry
$registry = new \Prometheus\CollectorRegistry(new \Prometheus\Storage\InMemory());
$namespace = 'teamspeak3';
$virtualserver_label_keys = [
    'virtualserver_id',
    'virtualserver_port',
    'virtualserver_unique_identifier'
];

// set ${namespace}_up for exporter status
$up = $registry->getOrRegisterGauge(
    $namespace,
    'up',
    $help_texts['up'],
    []
);
$up->set(1, []);


$host = getenv('QUERY_HOST');
$port = getenv('QUERY_PORT');
$user = rawurlencode(getenv('QUERY_USER_NAME'));
$password = rawurlencode(trim(file_get_contents(getenv('QUERY_USER_PASSWORD_FILE'))));

$uri = 'serverquery://'.$user.':'.$password.'@'.$host.':'.$port.'/';

try {
    // open a connection to the server
    $ts3 = TeamSpeak3::factory($uri);

    // loop over all virtualservers, because some statistics (e.g. packet loss)
    // are tracked per virtualserver
    foreach($ts3->serverList() as $virtualserver) {
        $infos = array_map(function($info_raw) {
            return is_object($info_raw) ? $info_raw->toString() : $info_raw;
        }, $virtualserver->getInfo());

        // initialize with an empty array
        $virtualserver_label_values = [];
        // fill $virtualserver_label_values
        foreach($virtualserver_label_keys as $virtualserver_label_key) {
            $virtualserver_label_values[] = $infos[$virtualserver_label_key];
        }

        foreach($infos as $name => $data) {
            // gauge only supports floats
            // $infos/$data is a mix of int, string and NULL
            if(preg_match('/^\d*(\.\d*)?$/', $data)) {
                $gauge = $registry->getOrRegisterGauge(
                    $namespace,
                    $name,
                    array_key_exists($name, $help_texts) ? $help_texts[$name] : 'no help text available',
                    preg_match('/^virtualserver_/', $name) ? $virtualserver_label_keys : []
                );
                $gauge->set(
                    (float) $data,
                    preg_match('/^virtualserver_/', $name) ? $virtualserver_label_values : []
                );
            }
        }
    }
} catch (Exception $e) {
    // something failed, set ${namespace}_up to 0
    $up->set(0, []);
}


// render all metrics and output them
$renderer = new \Prometheus\RenderTextFormat();
$result = $renderer->render($registry->getMetricFamilySamples());

header('Content-type: ' . \Prometheus\RenderTextFormat::MIME_TYPE);
echo $result;