<?php
// ========================================
// FILE: php/koneksi.php
// Konfigurasi Koneksi Database
// ========================================

// CORS HEADERS - Wajib ada agar request dari browser tidak diblok
header('Access-Control-Allow-Origin: *');
header('Access-Control-Allow-Methods: GET, POST, OPTIONS');
header('Access-Control-Allow-Headers: Content-Type, X-Requested-With');
header('Content-Type: application/json; charset=utf-8');

// Handle preflight request (OPTIONS)
if ($_SERVER['REQUEST_METHOD'] === 'OPTIONS') {
    http_response_code(200);
    exit();
}

// Baca dari Environment Variable (untuk deployment Coolify/server)
// Jika tidak ada, fallback ke konfigurasi XAMPP lokal
$host     = getenv('DB_HOST')     ?: ($_SERVER['DB_HOST']     ?? ($_ENV['DB_HOST']     ?? "localhost"));
$username = getenv('DB_USER')     ?: ($_SERVER['DB_USER']     ?? ($_ENV['DB_USER']     ?? "root"));
$password = getenv('DB_PASSWORD') ?: ($_SERVER['DB_PASSWORD'] ?? ($_ENV['DB_PASSWORD'] ?? ""));
$database = getenv('DB_DATABASE') ?: ($_SERVER['DB_DATABASE'] ?? ($_ENV['DB_DATABASE'] ?? "pemetaan_kemiskinan"));
$port     = getenv('DB_PORT')     ?: ($_SERVER['DB_PORT']     ?? ($_ENV['DB_PORT']     ?? 3306));

// KONEKSI MYSQLI DENGAN LOGIKA FALLBACK
$conn = null;

// Aktifkan throwing exception untuk mysqli agar try-catch berfungsi dengan baik
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);

try {
    // 1. Coba koneksi utama sesuai konfigurasi Environment / Env File
    $conn = new mysqli($host, $username, $password, $database, (int)$port);
} catch (Exception $e) {
    // 2. Coba koneksi Fallback Pertama: Backup Kredensial Keras Database Coolify (Internal Network)
    try {
        $conn = new mysqli("tk4ksw0w40kg080wkk4soww4", "mysql", "KBw0yKLccMMoBOZJCf8WDHAO93uI65om0s4ajnzQEt5mkuh0NaIytoWb7TgR5ciq", "default", 3306);
    } catch (Exception $e_backup) {
        // 3. Coba koneksi Fallback Kedua ke Docker Host lokal (host.docker.internal)
        try {
            $conn = new mysqli("host.docker.internal", "root", "", "pemetaan_kemiskinan", 3306);
        } catch (Exception $e_docker) {
            // 4. Coba koneksi Fallback Ketiga ke Localhost murni (XAMPP default)
            try {
                $conn = new mysqli("localhost", "root", "", "pemetaan_kemiskinan", 3306);
            } catch (Exception $e_local) {
                // Jika semua gagal, berikan respon error
                sendJSON('error', 'Koneksi database utama & seluruh fallback gagal. Error Utama: ' . $e->getMessage() . ' | Error Backup: ' . $e_backup->getMessage());
                exit();
            }
        }
    }
}

// SET CHARSET UTF-8
$conn->set_charset("utf8mb4");

// FUNCTION UNTUK ESCAPE INPUT
function sanitize($string, $conn) {
    return $conn->real_escape_string(strip_tags(trim($string)));
}

// FUNCTION UNTUK RESPONSE JSON
function sendJSON($status, $message, $data = null) {
    $response = [
        'status'  => $status,
        'message' => $message
    ];
    if ($data !== null) {
        $response['data'] = $data;
    }
    echo json_encode($response, JSON_UNESCAPED_UNICODE);
    exit();
}

?>