<?php
// ================================================================
// API: Reverse Geocoding Proxy (Nominatim)
// ================================================================
header('Content-Type: application/json; charset=utf-8');
header('Access-Control-Allow-Origin: *');

$lat = isset($_GET['lat']) ? (float)$_GET['lat'] : null;
$lng = isset($_GET['lng']) ? (float)$_GET['lng'] : null;

if (!$lat || !$lng) {
    http_response_code(400);
    echo json_encode(['error' => 'lat dan lng wajib']);
    exit;
}

$url = "https://nominatim.openstreetmap.org/reverse?format=json&lat={$lat}&lon={$lng}&addressdetails=1&accept-language=id";

$opts    = ['http' => ['header' => "User-Agent: WebGIS-PovertyMap/2.0 (https://github.com)\r\n", 'timeout' => 10]];
$context = stream_context_create($opts);
$result  = @file_get_contents($url, false, $context);

if ($result === false) {
    echo json_encode(['display_name' => "{$lat}, {$lng}", 'fallback' => true]);
    exit;
}

$data = json_decode($result, true);
$addr = $data['display_name'] ?? "{$lat}, {$lng}";

// Ekstrak komponen alamat
$components = $data['address'] ?? [];
$kelurahan  = $components['suburb'] ?? $components['village'] ?? $components['neighbourhood'] ?? '';
$kecamatan  = $components['city_district'] ?? $components['district'] ?? '';
$kota       = $components['city'] ?? $components['town'] ?? $components['county'] ?? '';

echo json_encode([
    'display_name' => $addr,
    'kelurahan'    => $kelurahan,
    'kecamatan'    => $kecamatan,
    'kota'         => $kota,
    'lat'          => $lat,
    'lng'          => $lng,
]);