const express = require('express');
const multer = require('multer');
const path = require('path');
const fs = require('fs');

const router = express.Router();

// Ensure uploads directory exists
const uploadDir = path.join(__dirname, '../uploads');
if (!fs.existsSync(uploadDir)) {
    fs.mkdirSync(uploadDir);
}

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

const upload = multer({ storage: storage });

// POST /api/upload
router.post('/', upload.single('file'), (req, res) => {
    if (!req.file) {
        return res.status(400).json({ error: 'No file uploaded' });
    }

    // Return the URL to access the file
    // Assumes server serves 'uploads' folder at '/uploads'
    const fileUrl = `/uploads/${req.file.filename}`;
    res.json({ url: fileUrl, filename: req.file.filename });
});

module.exports = router;