<?php
// api/geocode.php
// Reverse Geocoding via Nominatim (OpenStreetMap)

header('Content-Type: application/json; charset=utf-8');
header('Access-Control-Allow-Origin: *');

$lat = $_GET['lat'] ?? null;
$lng = $_GET['lng'] ?? null;

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

$lat = (float)$lat;
$lng = (float)$lng;

$url = "https://nominatim.openstreetmap.org/reverse?format=jsonv2&lat={$lat}&lon={$lng}&zoom=18&addressdetails=1";

$context = stream_context_create([
    'http' => [
        'method' => 'GET',
        'header' => "User-Agent: SIG-Kemiskinan/1.0 (sig@example.com)\r\n",
        'timeout' => 8,
    ]
]);

$response = @file_get_contents($url, false, $context);

if ($response === false) {
    // Fallback: koordinat saja
    echo json_encode([
        'success' => true,
        'alamat' => "Koordinat: {$lat}, {$lng}",
        'detail' => null
    ]);
    exit;
}

$data = json_decode($response, true);

if (!$data || isset($data['error'])) {
    echo json_encode([
        'success' => true,
        'alamat' => "Koordinat: {$lat}, {$lng}",
        'detail' => null
    ]);
    exit;
}

// Susun alamat yang rapi
$addr = $data['address'] ?? [];
$parts = array_filter([
    $addr['road'] ?? $addr['pedestrian'] ?? $addr['path'] ?? null,
    $addr['house_number'] ?? null,
    $addr['neighbourhood'] ?? $addr['suburb'] ?? null,
    $addr['city'] ?? $addr['town'] ?? $addr['village'] ?? $addr['county'] ?? null,
]);

$alamat = !empty($parts)
    ? implode(', ', $parts)
    : ($data['display_name'] ?? "Koordinat: {$lat}, {$lng}");

echo json_encode([
    'success' => true,
    'alamat' => $alamat,
    'display_name' => $data['display_name'] ?? '',
    'detail' => $addr
]);