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<?php
// Multi Domain Live Checker (HTTPS with HTTP fallback)
// Usage: open in browser, paste domains (one per line), submit
// API: POST domains (text) or ?format=json to get JSON output

ini_set('display_errors', '0');
error_reporting(0);

function normalize_domain(string $raw): string {
    $domain = trim($raw);
    $domain = preg_replace('/^[^\w]+|[^\w.-]+$/', '', $domain ?? '');
    // Remove scheme if present
    $domain = preg_replace('#^https?://#i', '', $domain);
    // Remove path
    $domain = explode('/', $domain, 2)[0];
    return strtolower($domain);
}

function build_url(string $domain, string $scheme = 'https'): string {
    return $scheme . '://' . $domain . '/';
}

function http_probe(string $url, int $timeoutSec = 6): array {
    $ch = curl_init($url);
    curl_setopt_array($ch, [
        CURLOPT_NOBODY => true,               // HEAD first (faster)
        CURLOPT_FOLLOWLOCATION => true,
        CURLOPT_MAXREDIRS => 5,
        CURLOPT_CONNECTTIMEOUT => min(3, $timeoutSec),
        CURLOPT_TIMEOUT => $timeoutSec,
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_USERAGENT => 'DomainChecker/1.0 (+https://example) PHP/' . PHP_VERSION,
        CURLOPT_SSL_VERIFYPEER => false,      // We only care about reachability
        CURLOPT_SSL_VERIFYHOST => 0,
        CURLOPT_HEADER => true,
    ]);

$start = microtime(true);
    $res = curl_exec($ch);
    $totalTime = (int) round((microtime(true) - $start) * 1000);

$curlErrNo = curl_errno($ch);
    $curlErr = $curlErrNo ? curl_error($ch) : '';
    $httpCode = (int) curl_getinfo($ch, CURLINFO_RESPONSE_CODE);
    $effectiveUrl = curl_getinfo($ch, CURLINFO_EFFECTIVE_URL);
    $primaryIp = curl_getinfo($ch, CURLINFO_PRIMARY_IP);

// Some servers block HEAD; try a lightweight GET if HEAD failed without HTTP code
    if ($curlErrNo !== 0 || $httpCode === 0) {
        curl_setopt_array($ch, [
            CURLOPT_NOBODY => false,
            CURLOPT_RANGE => '0-0',          // fetch 1st byte only
        ]);
        $start = microtime(true);
        $res = curl_exec($ch);
        $totalTime = (int) round((microtime(true) - $start) * 1000);
        $curlErrNo = curl_errno($ch);
        $curlErr = $curlErrNo ? curl_error($ch) : '';
        $httpCode = (int) curl_getinfo($ch, CURLINFO_RESPONSE_CODE);
        $effectiveUrl = curl_getinfo($ch, CURLINFO_EFFECTIVE_URL);
        $primaryIp = curl_getinfo($ch, CURLINFO_PRIMARY_IP);
    }

curl_close($ch);

return [
        'url' => $url,
        'effective_url' => $effectiveUrl ?: $url,
        'http_code' => $httpCode,
        'ip' => $primaryIp ?: '',
        'ok' => ($httpCode >= 200 && $httpCode < 400),
        'time_ms' => $totalTime,
        'error' => $curlErr,
    ];
}

function check_one_domain(string $rawDomain, int $timeout): array {
    $domain = normalize_domain($rawDomain);
    if ($domain === '') {
        return [
            'input' => $rawDomain,
            'domain' => '',
            'status' => 'invalid',
            'ok' => false,
            'details' => 'Empty/invalid domain',
        ];
    }

// Try HTTPS first
    $httpsUrl = build_url($domain, 'https');
    $r1 = http_probe($httpsUrl, $timeout);
    if ($r1['ok']) {
        $host = parse_url($r1['effective_url'] ?: $httpsUrl, PHP_URL_HOST) ?: $domain;
        $ip = $r1['ip'] ?: resolve_ip($host);
        return [
            'input' => $rawDomain,
            'domain' => $domain,
            'status' => 'up',
            'ok' => true,
            'scheme' => 'https',
            'http_code' => $r1['http_code'],
            'time_ms' => $r1['time_ms'],
            'ip' => $ip,
            'url' => $r1['effective_url'],
        ];
    }

// Fallback to HTTP
    $httpUrl = build_url($domain, 'http');
    $r2 = http_probe($httpUrl, $timeout);
    if ($r2['ok']) {
        $host = parse_url($r2['effective_url'] ?: $httpUrl, PHP_URL_HOST) ?: $domain;
        $ip = $r2['ip'] ?: resolve_ip($host);
        return [
            'input' => $rawDomain,
            'domain' => $domain,
            'status' => 'up',
            'ok' => true,
            'scheme' => 'http',
            'http_code' => $r2['http_code'],
            'time_ms' => $r2['time_ms'],
            'ip' => $ip,
            'url' => $r2['effective_url'],
        ];
    }

// Down or errors
    $details = trim(($r1['error'] ?: '') . ' ' . ($r2['error'] ?: ''));
    $code = $r1['http_code'] ?: $r2['http_code'] ?: 0;
    $fallbackIp = resolve_ip($domain);
    return [
        'input' => $rawDomain,
        'domain' => $domain,
        'status' => 'down',
        'ok' => false,
        'http_code' => $code,
        'time_ms' => max($r1['time_ms'] ?? 0, $r2['time_ms'] ?? 0),
        'ip' => $r1['ip'] ?: $r2['ip'] ?: $fallbackIp,
        'url' => $r1['effective_url'] ?: $r2['effective_url'] ?: build_url($domain),
        'details' => $details,
    ];
}

// Controller
$domainsRaw = isset($_POST['domains']) ? (string)$_POST['domains'] : '';
$timeout = isset($_POST['timeout']) ? max(2, min(30, (int)$_POST['timeout'])) : 6;
$wantJson = isset($_GET['format']) && strtolower($_GET['format']) === 'json';

$results = [];
if ($domainsRaw !== '') {
    $lines = preg_split('/\r?\n/', $domainsRaw);
    $seen = [];
    foreach ($lines as $line) {
        if (trim($line) === '') continue;
        $norm = normalize_domain($line);
        if ($norm === '' || isset($seen[$norm])) {
            // keep original for display if invalid
            if ($norm === '') {
                $results[] = [
                    'input' => $line,
                    'domain' => '',
                    'status' => 'invalid',
                    'ok' => false,
                    'details' => 'Empty/invalid domain',
                ];
            }
            continue;
        }
        $seen[$norm] = true;
        $results[] = check_one_domain($line, $timeout);
    }
}

if ($wantJson) {
    header('Content-Type: application/json');
    echo json_encode([
        'count' => count($results),
        'results' => $results,
    ]);
    exit;
}

render_html($results, $domainsRaw, $timeout);