<?php
// ❌ No header() here

require_once __DIR__ . '/../.hta_lib/maxmind-db-reader/autoload.php';

use MaxMind\Db\Reader;

function respond($status, $data = null, $error = null)
{
    echo json_encode([
        'success' => $status,
        'data'    => $data,
        'error'   => $error
    ], JSON_PRETTY_PRINT);
    exit;
}

if (!isset($_GET['ip']) || trim($_GET['ip']) === '') {
    respond(false, null, 'IP parameter is required');
}

$ip = trim($_GET['ip']);

if (!filter_var($ip, FILTER_VALIDATE_IP)) {
    respond(false, null, 'Invalid IP address');
}

try {
    $cityReader = new Reader(__DIR__ . '/../.hta_lib/data/GeoLite2-City.mmdb');
    $asnReader  = new Reader(__DIR__ . '/../.hta_lib/data/GeoLite2-ASN.mmdb');

    $cityData = $cityReader->get($ip);
    $asnData  = $asnReader->get($ip);

    $cityReader->close();
    $asnReader->close();

    $response = [
        'ip' => $ip,

        'continent' => [
            'name' => $cityData['continent']['names']['en'] ?? null,
            'code' => $cityData['continent']['code'] ?? null
        ],

        'country' => [
            'name' => $cityData['country']['names']['en'] ?? null,
            'code' => $cityData['country']['iso_code'] ?? null
        ],

        'state' => [
            'name' => $cityData['subdivisions'][0]['names']['en'] ?? null,
            'code' => $cityData['subdivisions'][0]['iso_code'] ?? null
        ],

        'city' => $cityData['city']['names']['en'] ?? null,

        'timezone' => $cityData['location']['time_zone'] ?? null,

        'location' => [
            'latitude'  => $cityData['location']['latitude'] ?? null,
            'longitude' => $cityData['location']['longitude'] ?? null
        ],

        'postal_code' => $cityData['postal']['code'] ?? null,

        'asn' => [
            'number' => $asnData['autonomous_system_number'] ?? null,
            'org'    => $asnData['autonomous_system_organization'] ?? null
        ],
    ];

    $anycastASN = [15169, 13335, 36692];
    $response['is_anycast'] = in_array($response['asn']['number'], $anycastASN);
    $response['note'] = $response['is_anycast']
        ? 'Anycast IP detected. Location may vary.'
        : 'IP-based location is approximate.';

    respond(true, $response);

} catch (Exception $e) {
    respond(false, null, $e->getMessage());
}