<?php
// ============================================================
// config.php — WebGIS Kemiskinan v3.0
// ============================================================
define('DB_HOST', getenv('DB_HOST') ?: 'localhost');
define('DB_USER', getenv('DB_USER') ?: 'root');
define('DB_PASS', getenv('DB_PASSWORD') ?: '');
define('DB_NAME', getenv('DB_NAME') ?: 'webgis_kemiskinan');
define('UPLOAD_DIR', __DIR__ . '/uploads/');

date_default_timezone_set('Asia/Pontianak');

function getDB(): PDO {
    static $pdo = null;
    if ($pdo === null) {
        try {
            $pdo = new PDO("mysql:host=".DB_HOST.";dbname=".DB_NAME.";charset=utf8mb4", DB_USER, DB_PASS, [
                PDO::ATTR_ERRMODE            => PDO::ERRMODE_EXCEPTION,
                PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
                PDO::ATTR_EMULATE_PREPARES   => false,
            ]);
        } catch (PDOException $e) {
            jsonErr('Koneksi database gagal: ' . $e->getMessage(), 500);
        }
    }
    return $pdo;
}

function startSession(): void {
    if (session_status() === PHP_SESSION_NONE) {
        session_name('webgis_v3');
        session_set_cookie_params(['lifetime'=>28800,'path'=>'/','httponly'=>true,'samesite'=>'Strict']);
        session_start();
    }
}

function getCurrentUser(): ?array {
    startSession();
    return $_SESSION['user'] ?? null;
}

function requireLogin(): array {
    $u = getCurrentUser();
    if (!$u) jsonErr('Silakan login terlebih dahulu.', 401);
    return $u;
}

function requireRole(array $roles): array {
    $u = requireLogin();
    if (!in_array($u['role'], $roles, true)) jsonErr('Akses ditolak untuk role: '.$u['role'], 403);
    return $u;
}

function canWrite(): bool {
    $u = getCurrentUser();
    return $u && in_array($u['role'], ['superadmin','pengurus','relawan'], true);
}

function jsonOk($data = null, string $msg = 'Berhasil'): void {
    header('Content-Type: application/json; charset=utf-8');
    echo json_encode(['success'=>true,'message'=>$msg,'data'=>$data], JSON_UNESCAPED_UNICODE);
    exit;
}

function jsonErr(string $msg, int $code = 400): void {
    http_response_code($code);
    header('Content-Type: application/json; charset=utf-8');
    echo json_encode(['success'=>false,'message'=>$msg], JSON_UNESCAPED_UNICODE);
    exit;
}

function log_aksi(int $userId, string $aksi, string $tabel, int $recId, string $ket = ''): void {
    try {
        getDB()->prepare("INSERT INTO log_aktivitas (user_id,aksi,tabel,record_id,keterangan,ip_address) VALUES (?,?,?,?,?,?)")
               ->execute([$userId, $aksi, $tabel, $recId, $ket, $_SERVER['REMOTE_ADDR'] ?? '']);
    } catch (Exception $e) {}
}

function sanitize(string $s): string {
    return htmlspecialchars(strip_tags(trim($s)), ENT_QUOTES, 'UTF-8');
}

// Hitung umur dari tanggal lahir
function hitungUmur(string $tgl): int {
    return (int) date_diff(date_create($tgl), date_create('today'))->y;
}

// Validasi pendidikan vs umur
function validasiPendidikan(int $umur, string $pendidikan, string $statusPendidikan): ?string {
    if ($umur >= 7 && $umur <= 15 && $statusPendidikan === 'tidak_sekolah'
        && in_array($pendidikan, ['tidak_sekolah','sd'])) {
        return 'Peringatan: Usia 7-15 tahun seharusnya masih sekolah SD/SMP.';
    }
    if ($umur >= 16 && $umur <= 18 && $statusPendidikan === 'tidak_sekolah') {
        return 'Peringatan: Usia 16-18 tahun seharusnya masih sekolah SMA/SMK.';
    }
    return null;
}

header('Content-Type: application/json; charset=utf-8');
if (!is_dir(UPLOAD_DIR)) mkdir(UPLOAD_DIR, 0755, true);