<?php
require __DIR__ . '/vendor/autoload.php';
require __DIR__ . '/config.php';

use App\BOB;
use App\DB;
use Amp\Loop;
use Amp\Parallel\Worker\DefaultPool;
use Amp\TimeoutException;

/* Disable execution limit */
set_time_limit(0);

$pdo = (new DB($options))->pdo;

$lockfile = __DIR__ . '/checker.lock';
$full = false;
$results = [];

if($argc == 2 && $argv[1] == "full") {
    $full = true;
}

echo "[CHECKER] Checking lockfile" . PHP_EOL;
$fp = fopen($lockfile, 'c');

if(!flock($fp, LOCK_EX | LOCK_NB)) {
    echo "[CHECKER] Looks like another checker is running, exiting..." . PHP_EOL;
    exit(-1);
}

echo "[DB] Fetching hosts to check from database" . PHP_EOL;
if ((($options['fullhour'] >= 0) && ($options['fullhour'] <= 23)) && date('H') == $options['fullhour'] || $full) { // check all hosts at full check hour or when argument 'full' passed
    echo "[CHECKER] Starting FULL check" . PHP_EOL;
    $STH = $pdo->query("SELECT `host`, `base32` FROM `hosts`");

} else {
    $STH = $pdo->query("SELECT `host`, `base32` FROM `hosts` WHERE `disabled` = '0'");
}
$hosts = $STH->fetchAll(PDO::FETCH_KEY_PAIR);

echo "[BOB] Starting session for checking" . PHP_EOL;
$bob = new BOB($options);
if ($bob->setnick()) {
    $bob->options();
    $bob->newkeys();
    $bob->intun();
    $bob->start();

    /* Sleep 10 seconds awaitng tunnels get built */
    echo "[BOB] Session started, awaiting 10 seconds for tunnels" . PHP_EOL;
    sleep(10);

} else {
    echo "[BOB] Stale session is found, using it" . PHP_EOL;
    $bob->getnick();
}

/* Start async checker tasks */
try {
    Loop::run(function () use (&$results, $hosts, $options) {
        $pool = new DefaultPool($options['checkthreads']);

        $coroutines = [];

        foreach ($hosts as $host => $base32) {
            $coroutines[$host] = Amp\call(function () use ($pool, $base32, $options) {
                return yield $pool->enqueue(new App\Checker($base32, $options));
            });
        }

        $results = yield Amp\Promise\all($coroutines);

        return yield $pool->shutdown();
    });
//} catch (Amp\TimeoutException $ex) {
} catch (\Throwable $ex) {
    echo "[Checker] Exception: " . $ex . PHP_EOL;
}


echo "[BOB] Stopping session" . PHP_EOL;
$bob->stop();
$bob->clear();
$bob = null;


echo "[DB] Saving check results" . PHP_EOL;
$i = 0;
$pdo->beginTransaction();

foreach ($results as $host => $ts) {
    if($ts) {
        $pdo->exec("UPDATE `hosts` SET `last_seen` = FROM_UNIXTIME(" . $ts . "), `disabled` = 0, `hidden` = 0 WHERE `host` = '" . $host . "'");
        $i++;
    }
}

$pdo->commit();

echo "[CHECKER] Unlocking and closing lockfile" . PHP_EOL;
fclose($fp);

echo "[CHECKER] Result: Total hosts: " . count($results) . ", Alive: " . $i . PHP_EOL;