import multer from 'multer';
import path from 'path';
import { fileURLToPath } from 'url';
import fs from 'fs';

const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);

// Upload-Verzeichnis erstellen, falls nicht vorhanden
const uploadDir = process.env.UPLOAD_DIR || path.join(__dirname, '../uploads');
if (!fs.existsSync(uploadDir)) {
  fs.mkdirSync(uploadDir, { recursive: true });
}

// Multer-Konfiguration
const storage = multer.diskStorage({
  destination: (req, file, cb) => {
    cb(null, uploadDir);
  },
  filename: (req, file, cb) => {
    const uniqueSuffix = Date.now() + '-' + Math.round(Math.random() * 1E9);
    const ext = path.extname(file.originalname);
    cb(null, `foto-${uniqueSuffix}${ext}`);
  }
});

const fileFilter = (req, file, cb) => {
  // Nur Bilder erlauben
  const allowedTypes = /jpeg|jpg|png|gif|webp/;
  const extname = allowedTypes.test(path.extname(file.originalname).toLowerCase());
  const mimetype = allowedTypes.test(file.mimetype);

  if (mimetype && extname) {
    return cb(null, true);
  } else {
    cb(new Error('Nur Bilddateien sind erlaubt (JPEG, PNG, GIF, WebP)'));
  }
};

export const upload = multer({
  storage: storage,
  limits: {
    fileSize: parseInt(process.env.MAX_FILE_SIZE) || 10 * 1024 * 1024 // 10MB default
  },
  fileFilter: fileFilter
});