<?php
// ============================================================
// Konfigurasi & Koneksi Database
// WebGIS Pengentasan Kemiskinan v2.0
// ============================================================

define('DB_HOST',    getenv('DB_HOST') ?: 'localhost');
define('DB_PORT',    getenv('DB_PORT') ?: '3306');
define('DB_NAME',    getenv('DB_NAME_KEMISKINAN') ?: 'webgis_kemiskinan');
define('DB_USER',    getenv('DB_USER') ?: 'root');
define('DB_PASS',    getenv('DB_PASSWORD') ?: '');
define('DB_CHARSET', 'utf8mb4');

define('APP_NAME',    'WebGIS Pengentasan Kemiskinan');
define('APP_VERSION', '2.0.0');
define('APP_URL',     'http://localhost/webgis-kemiskinan');
define('APP_ENV',     'development'); // Ganti ke 'production' saat deploy

define('UPLOAD_PATH',      __DIR__ . '/../uploads/');
define('UPLOAD_BUKTI',     UPLOAD_PATH . 'bukti/');
define('UPLOAD_LAPORAN',   UPLOAD_PATH . 'foto_laporan/');
define('UPLOAD_FOTO',      UPLOAD_PATH . 'foto_profil/');
define('MAX_FILE_SIZE',    5 * 1024 * 1024); // 5 MB
define('ALLOWED_IMG_EXT',  ['jpg','jpeg','png','webp']);
define('ALLOWED_FILE_EXT', ['jpg','jpeg','png','webp','pdf']);

// Buat folder upload jika belum ada
foreach ([UPLOAD_BUKTI, UPLOAD_LAPORAN, UPLOAD_FOTO] as $dir) {
    if (!is_dir($dir)) @mkdir($dir, 0755, true);
}

// ============================================================
// Koneksi PDO
// ============================================================

$dsn = "mysql:host=" . DB_HOST . ";port=" . DB_PORT . ";dbname=" . DB_NAME . ";charset=" . DB_CHARSET;

$pdoOptions = [
    PDO::ATTR_ERRMODE            => PDO::ERRMODE_EXCEPTION,
    PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
    PDO::ATTR_EMULATE_PREPARES   => false,
];

try {
    $pdo = new PDO($dsn, DB_USER, DB_PASS, $pdoOptions);
} catch (PDOException $e) {
    http_response_code(500);
    header('Content-Type: application/json');
    // Jangan expose detail error di produksi
    $errMsg = (defined('APP_ENV') && APP_ENV === 'development') ? $e->getMessage() : 'Hubungi administrator sistem.';
    echo json_encode([
        'success' => false,
        'message' => 'Koneksi database gagal: ' . DB_NAME . '@' . DB_HOST . ' tidak ditemukan. Pastikan database sudah dibuat dan nama database benar.',
        'error'   => $errMsg
    ]);
    exit;
}

// ============================================================
// Helper: Response JSON
// ============================================================

function jsonResponse(bool $success, string $message, array $data = [], int $httpCode = 200): void {
    http_response_code($httpCode);
    header('Content-Type: application/json; charset=utf-8');
    header('Access-Control-Allow-Origin: *');
    header('Access-Control-Allow-Methods: GET, POST, PUT, DELETE, OPTIONS');
    header('Access-Control-Allow-Headers: Content-Type, Authorization');
    echo json_encode(array_merge(['success' => $success, 'message' => $message], $data), JSON_UNESCAPED_UNICODE);
    exit;
}

// ============================================================
// Helper: Sanitasi & Validasi
// ============================================================

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

function sanitizeStr(?string $v, int $max = 255): string {
    return mb_substr(trim($v ?? ''), 0, $max);
}

function validateNIK(string $nik): bool {
    return preg_match('/^\d{16}$/', $nik) === 1;
}

function validateCoord(string $val, string $type = 'lat'): bool {
    $f = (float)$val;
    return $type === 'lat' ? ($f >= -90 && $f <= 90) : ($f >= -180 && $f <= 180);
}

// ============================================================
// Helper: Upload File
// ============================================================

function uploadFile(array $file, string $destDir, array $allowedExt = null): ?string {
    if ($allowedExt === null) $allowedExt = ALLOWED_FILE_EXT;
    if ($file['error'] !== UPLOAD_ERR_OK) return null;
    if ($file['size'] > MAX_FILE_SIZE) throw new RuntimeException('Ukuran file melebihi 5MB.');
    $ext = strtolower(pathinfo($file['name'], PATHINFO_EXTENSION));
    if (!in_array($ext, $allowedExt, true)) throw new RuntimeException("Format file .$ext tidak diizinkan.");
    $filename = uniqid('img_', true) . '.' . $ext;
    $dest = rtrim($destDir, '/') . '/' . $filename;
    if (!move_uploaded_file($file['tmp_name'], $dest)) throw new RuntimeException('Gagal menyimpan file.');
    return $filename;
}

// ============================================================
// Helper: Log Aktivitas
// ============================================================

function logAktivitas(PDO $pdo, ?int $userId, string $aksi, string $tabel = '', string $recordId = '', $dataLama = null, $dataBaru = null): void {
    try {
        $stmt = $pdo->prepare("
            INSERT INTO log_aktivitas (user_id, aksi, tabel, record_id, data_lama, data_baru, ip_address, user_agent)
            VALUES (:u, :a, :t, :r, :dl, :db, :ip, :ua)
        ");
        $stmt->execute([
            ':u'  => $userId,
            ':a'  => $aksi,
            ':t'  => $tabel,
            ':r'  => $recordId,
            ':dl' => $dataLama ? json_encode($dataLama, JSON_UNESCAPED_UNICODE) : null,
            ':db' => $dataBaru ? json_encode($dataBaru, JSON_UNESCAPED_UNICODE) : null,
            ':ip' => $_SERVER['REMOTE_ADDR'] ?? null,
            ':ua' => substr($_SERVER['HTTP_USER_AGENT'] ?? '', 0, 255),
        ]);
    } catch (Exception) { /* log gagal tidak menghentikan proses */ }
}

// ============================================================
// Validasi Logika Pendidikan vs Umur
// ============================================================

function validasiPendidikanUmur(int $umur, string $pendidikan, string $statusPendidikan): array {
    $warnings = [];
    $errors   = [];

    if ($umur >= 7 && $umur <= 12) {
        if ($statusPendidikan !== 'sekolah') {
            $warnings[] = "Anak usia $umur tahun semestinya masih sekolah SD.";
        }
    } elseif ($umur >= 13 && $umur <= 15) {
        if ($statusPendidikan !== 'sekolah') {
            $warnings[] = "Anak usia $umur tahun semestinya masih sekolah SMP.";
        }
    } elseif ($umur >= 16 && $umur <= 18) {
        if ($statusPendidikan !== 'sekolah') {
            $warnings[] = "Anak usia $umur tahun semestinya masih sekolah SMA/SMK.";
        }
    }
    // Umur > 18: bebas, boleh tidak sekolah, boleh pelatihan

    return ['warnings' => $warnings, 'errors' => $errors];
}

// ============================================================
// Prioritas Bantuan
// ============================================================

function hitungPrioritasBantuan(string $statusEkonomi, string $kondisiKesehatan, bool $belumPernahDibantu): string {
    if ($statusEkonomi === 'miskin' && in_array($kondisiKesehatan, ['sakit_parah', 'disabilitas'])) {
        return 'KRITIS';
    }
    if ($statusEkonomi === 'miskin' && $belumPernahDibantu) {
        return 'TINGGI';
    }
    if ($statusEkonomi === 'miskin') {
        return 'SEDANG';
    }
    if ($statusEkonomi === 'rentan' && in_array($kondisiKesehatan, ['sakit_parah', 'disabilitas'])) {
        return 'SEDANG';
    }
    return 'RENDAH';
}