<?php
$lines = [];
//$lines[] = "_____________________________";
//$lines[] = "____________start____________";
//$lines[] = "_____________________________";
$dateUpdate = date("Y-m-d H:i:s");

$lines[] = "[$dateUpdate]";
$canUpdate = true;
if (isset($_ENV['LOCAL']) && $_ENV['LOCAL']) {
    $lines[] = "die in local";
    $canUpdate = false;
}
$needEnvKeys = [
    "REAL_PUBLIC_IP_SERVICE","DYNDNS_DOMAIN_UPDATE","DYNDNS_USER","DYNDNS_PASSWORD","DNS_UPDATE_SRC"
];
$emptyEnvKeys = [];

foreach ($needEnvKeys as $needEnvKey) {
    if (!isset($_ENV[$needEnvKey])) {
        $emptyEnvKeys[] = $needEnvKey;
    }
}

if (count($emptyEnvKeys) > 0) {
    $canUpdate = false;
    $lines[] = "Empty env configuration!";
    $lines[] = "The following env configuration keys are missing:\n";
    $lines[] = implode(", ", $emptyEnvKeys);
}

if ($canUpdate) {
    $toUpdateString = $_ENV['DYNDNS_DOMAIN_UPDATE'];
    $user = $_ENV['DYNDNS_USER'];
    $pass = $_ENV['DYNDNS_PASSWORD'];

    if (!$toUpdateString || !$user || !$pass) {
        $lines[] = "Empty ENV data!!!!!!!!!!!";
    }
    $toUpdateArray = explode(",", $toUpdateString);
    $useragent = 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_8_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2403.89 Safari/537.36';
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $_ENV['REAL_PUBLIC_IP_SERVICE']);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_USERAGENT, $useragent);
    curl_setopt($ch, CURLOPT_MAXREDIRS, 10);
    $content = curl_exec($ch);
    if (curl_errno($ch)) {
        $lines[] = "Error:" . curl_error($ch);
        $serverIp = false;
    } else {
        $serverIp = $content;
    }
    curl_close($ch);

    if ($serverIp) {
        foreach ($toUpdateArray as $toUpdate) {
            $toUpdate = trim($toUpdate);
            $currentIp = trim(shell_exec("dig +short @208.67.222.222 $toUpdate A | head -n1"));
            if ($currentIp == $serverIp) {
                $lines[] = "$toUpdate: same (not update)";
                continue;
            }
            $url = strtr($_ENV['DNS_UPDATE_SRC'],[
                "{toUpdateHostname}" => $toUpdate,
                "{realPublicIp}" => $serverIp,
            ]);
            $ch = curl_init();
            curl_setopt($ch, CURLOPT_URL, $url);
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
            curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
            curl_setopt($ch, CURLOPT_USERPWD, "$user:$pass");
            $response = curl_exec($ch);
            $lines[] = "$toUpdate ($currentIp): " . $response;
            curl_close($ch);
        }
    } else {
        $lines[] = "Server Error!!!!!!!!!!!!!";
    }
}

//$lines[] = "_____________________________";
//$lines[] = "_____________end_____________";
//$lines[] = "_____________________________";

foreach ($lines as $line) {
    echo $line . PHP_EOL;
}