<?php
mysqli_report(MYSQLI_REPORT_OFF);

function env_value($keys, $default = null) {
    foreach ($keys as $key) {
        $value = getenv($key);
        if ($value !== false && $value !== '') {
            return $value;
        }
    }
    return $default;
}

$explicitHost = env_value(['DB_HOST', 'MYSQL_HOST', 'MARIADB_HOST', 'DATABASE_HOST']);
$user = env_value(['DB_USER', 'MYSQL_USER', 'MARIADB_USER', 'DATABASE_USER'], 'root');
$pass = env_value(['DB_PASSWORD', 'MYSQL_PASSWORD', 'MARIADB_PASSWORD', 'DATABASE_PASSWORD'], '');
$db   = env_value(['DB_NAME_01', 'DB_NAME_SPBU', 'DB_NAME', 'MYSQL_DATABASE', 'MARIADB_DATABASE', 'DATABASE_NAME'], 'spbu_db');
$port = (int) env_value(['DB_PORT', 'MYSQL_PORT', 'MARIADB_PORT', 'DATABASE_PORT'], 3306);

$hosts = $explicitHost ? [$explicitHost] : [];
if (file_exists('/.dockerenv')) {
    $hosts = array_merge($hosts, ['mysql', 'mariadb', 'database', 'db']);
}
$hosts[] = 'localhost';
$hosts[] = '127.0.0.1';
$hosts = array_values(array_unique($hosts));

$conn = null;
$lastError = '';

foreach ($hosts as $host) {
    $candidate = mysqli_init();
    $candidate->options(MYSQLI_OPT_CONNECT_TIMEOUT, 3);
    if (@$candidate->real_connect($host, $user, $pass, $db, $port)) {
        $conn = $candidate;
        break;
    }
    $lastError = $candidate->connect_error ?: mysqli_connect_error();
}

if (!$conn) {
    http_response_code(500);
    die("Koneksi database gagal. Host dicoba: " . implode(', ', $hosts) . ". Error: " . $lastError);
}

$conn->set_charset("utf8mb4");
?>