server.js

// @ts-nocheck
import express from 'express';
import cors from 'cors';
import multer from 'multer';
import { uploadFile } from '@huggingface/hub';
import path from 'path';
import { fileURLToPath } from 'url';
import dotenv from 'dotenv';
dotenv.config()
// Fix __dirname for ES Modules
const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);

const app = express();
// Hugging Face Spaces requires port 7860
const port = process.env.PORT || 7860;

// Middleware
app.use(cors());
app.use(express.json());

// Configure Multer for memory storage (file buffer)
const storage = multer.memoryStorage();
const upload = multer({ storage: storage });

// SERVER CONFIGURATION
// PRIORITY: Environment Variable > Hardcoded Fallback
const SERVER_CONFIG = {
  TOKEN: process.env.HF_TOKEN || '',
  REPO: process.env.HF_REPO || 'TwanAPI/DataTwan',
  TYPE: 'dataset'
};

// --- API ROUTES ---

// Upload Endpoint
app.post('/api/upload', upload.single('file'), async (req, res) => {
  try {
    const file = req.file;
    const filePath = req.body.path;

    if (!file) {
      return res.status(400).json({ error: 'No file provided' });
    }

    if (!filePath) {
      return res.status(400).json({ error: 'No file path provided' });
    }

    console.log(`[SERVER] Uploading: ${filePath} (${file.size} bytes)`);

    // Upload to Hugging Face
    const response = await uploadFile({
      credentials: {
        accessToken: SERVER_CONFIG.TOKEN,
      },
      repo: {
        type: SERVER_CONFIG.TYPE,
        name: SERVER_CONFIG.REPO
      },
      file: {
        path: filePath,
        content: new Blob([file.buffer]),
      },
    });

    const commitHash = response.commit.oid;
    const urlPrefix = "https://huggingface.co/datasets";
    const publicUrl = `${urlPrefix}/${SERVER_CONFIG.REPO}/blob/${commitHash}/${filePath}`;

    console.log(`[SERVER] Success: ${publicUrl}`);

    res.json({ 
      success: true, 
      url: publicUrl 
    });

  } catch (error) {
    console.error('[SERVER] Upload Error:', error);
    res.status(500).json({ 
      success: false, 
      error: error.message || 'Internal Server Error' 
    });
  }
});

// --- SERVE FRONTEND (Production) ---

// Serve static files from the React build directory
app.use(express.static(path.join(__dirname, 'dist')));

// Handle React Routing (SPA) - Return index.html for any unknown route
app.get('*', (req, res) => {
  res.sendFile(path.join(__dirname, 'dist', 'index.html'));
});

// Start Server
app.listen(port, () => {
  console.log(`--------------------------------------------------`);
  console.log(`✅ Server running on port ${port}`);
  console.log(`   Target Repo: ${SERVER_CONFIG.REPO}`);
  console.log(`--------------------------------------------------`);
});