import multer from 'multer';
import path from 'path';
import fs from 'fs';

const storage = multer.diskStorage({
  destination: (req, file, cb) => {
    const rezeptnummer = req.body.rezeptnummer || req.params.rezeptnummer;
    const rNummer = 'R' + String(rezeptnummer).padStart(3, '0');
    const uploadPath = path.join('uploads', rNummer);
    
    if (!fs.existsSync(uploadPath)) {
      fs.mkdirSync(uploadPath, { recursive: true });
    }
    
    cb(null, uploadPath);
  },
  filename: (req, file, cb) => {
    const rezeptnummer = req.body.rezeptnummer || req.params.rezeptnummer;
    const rNummer = 'R' + String(rezeptnummer).padStart(3, '0');
    const uploadPath = path.join('uploads', rNummer);
    
    const existingFiles = fs.readdirSync(uploadPath).filter(f => f.startsWith(rNummer));
    const nextIndex = existingFiles.length;
    
    const filename = `${rNummer}_${nextIndex}.jpg`;
    cb(null, filename);
  }
});

const fileFilter = (req, file, cb) => {
  const allowedTypes = ['image/jpeg', 'image/jpg', 'image/png'];
  if (allowedTypes.includes(file.mimetype)) {
    cb(null, true);
  } else {
    cb(new Error('Nur JPG, JPEG und PNG Dateien erlaubt'), false);
  }
};

export const upload = multer({
  storage,
  fileFilter,
  limits: { fileSize: 10 * 1024 * 1024 } // 10MB
});