import { Router } from 'express';
import multer from 'multer';
import path from 'path';
import crypto from 'crypto';
import { authenticateToken } from '../middlewares/auth.middleware';
import { asyncHandler } from '../middlewares/errorHandler.middleware';
import { DocumentController } from '../controllers/document.controller';
import { ensureUploadDir, UPLOAD_DIR } from '../config/storage';

ensureUploadDir();

const storage = multer.diskStorage({
  destination: (_req, _file, cb) => cb(null, UPLOAD_DIR),
  filename: (_req, file, cb) => {
    const safeBase = path.basename(file.originalname).replace(/[^a-zA-Z0-9._-]/g, '_');
    const hash = crypto.randomBytes(6).toString('hex');
    const name = `${Date.now()}-${hash}-${safeBase}`;
    cb(null, name);
  }
});

const upload = multer({
  storage,
  limits: { fileSize: 100 * 1024 * 1024 }, // 100MB - actual limit enforced by controller using database config
});

const router = Router();
const controller = new DocumentController();

// multipart/form-data: file, requestId, optional category
router.post('/', authenticateToken, upload.single('file'), asyncHandler(controller.upload.bind(controller)));

export default router;