const express = require('express');
const cors = require('cors');
const redis = require('redis');

const app = express();
const PORT = 3001;

const redisClient = redis.createClient({
  url: 'redis://localhost:6379' // this is default port
});

// CORS
app.use((req, res, next) => {
  res.header('Access-Control-Allow-Origin', '*');
  res.header('Access-Control-Allow-Methods', 'GET, POST, OPTIONS, PUT, PATCH, DELETE');
  res.header('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content-Type, Accept');
  next();
});

app.get('/api/prices', async (req, res) => {
  try {
    const prices = await redisClient.lRange('btc_prices', 0, -1);
    
    res.header('Access-Control-Allow-Origin', '*');
    res.header('Access-Control-Allow-Methods', 'GET, POST, OPTIONS, PUT, PATCH, DELETE');
    res.header('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content-Type, Accept');
    
    res.json(prices);
  } catch (error) {
    console.error('Error fetching prices:', error);
    res.status(500).json({ error: 'Internal Server Error' });
  }
});

async function startServer() {
  await redisClient.connect();
  
  app.listen(PORT, () => {
    console.log(`Server running on http://localhost:${PORT}`);
  });
}

startServer().catch(console.error);