<?php
/**
 * Download de DB-IP Country Lite database voor GeoIP lookups.
 * Dit is een gratis database met wekelijkse updates.
 */

$outputDir = __DIR__ . '/../storage/geoip';

if (!is_dir($outputDir)) {
    mkdir($outputDir, 0755, true);
}

$yearMonth = date('Y-m');
$url = "https://download.db-ip.com/free/dbip-country-lite-{$yearMonth}.csv.gz";
$gzFile = $outputDir . '/dbip-country-lite.csv.gz';
$csvFile = $outputDir . '/dbip-country-lite.csv';

echo "Downloaden GeoIP database van {$url}...\n";

$fp = fopen($gzFile, 'w');
$ch = curl_init($url);
curl_setopt_array($ch, [
    CURLOPT_FILE => $fp,
    CURLOPT_FOLLOWLOCATION => true,
    CURLOPT_TIMEOUT => 120,
    CURLOPT_USERAGENT => 'SyslogDash/1.0',
]);
curl_exec($ch);
$httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);
fclose($fp);

if ($httpCode !== 200) {
    unlink($gzFile);
    echo "Fout: HTTP {$httpCode} bij downloaden GeoIP database\n";
    echo "Tip: bezoek https://www.db-ip.com/db/lite.php voor handmatige download\n";
    exit(1);
}

echo "Uitpakken...\n";
$gz = gzopen($gzFile, 'r');
$csv = fopen($csvFile, 'w');
while ($line = gzgets($gz)) {
    fputs($csv, $line);
}
gzclose($gz);
fclose($csv);
unlink($gzFile);

// Convert to binary format for faster lookups
$ipv4File = $outputDir . '/ipv4.bin';
$ipv6File = $outputDir . '/ipv6.bin';

$fh4 = fopen($ipv4File, 'w');
$fh6 = fopen($ipv6File, 'w');
$count4 = 0;
$count6 = 0;

$csv = fopen($csvFile, 'r');
while (($row = fgetcsv($csv)) !== false) {
    if (count($row) < 3) continue;
    $start = trim($row[0]);
    $end = trim($row[1]);
    $code = trim($row[2]);
    if (strlen($code) !== 2) continue;

    if (filter_var($start, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) {
        $startLong = ip2long($start);
        $endLong = ip2long($end);
        if ($startLong === false || $endLong === false) continue;
        fwrite($fh4, pack('NNa2', $startLong, $endLong, $code));
        $count4++;
    } elseif (filter_var($start, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) {
        $startBin = inet_pton($start);
        $endBin = inet_pton($end);
        if ($startBin === false || $endBin === false) continue;
        fwrite($fh6, $startBin . $endBin . $code);
        $count6++;
    }
}
fclose($csv);
fclose($fh4);
fclose($fh6);

unlink($csvFile);

echo "GeoIP database bijgewerkt:\n";
echo "  IPv4: {$count4} ranges\n";
echo "  IPv6: {$count6} ranges\n";
echo "  Bestanden: {$ipv4File}, {$ipv6File}\n";