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

const app = express();
const PORT = process.env.PORT || 3000;

app.use(express.json());
app.use(express.static(path.join(__dirname, 'public')));

// API routes
app.get('/api/greeting', (req, res) => {
  const greetings = [
    '안녕하세요! 👋',
    '반갑습니다! 😊',
    '어서오세요! 🌸',
    '좋은 하루예요! ☀️',
    '환영합니다! 🎉',
  ];
  const message = greetings[Math.floor(Math.random() * greetings.length)];
  res.json({ message });
});

app.get('/api/stats', (req, res) => {
  res.json({
    uptime: Math.floor(process.uptime()),
    nodeVersion: process.version,
    platform: process.platform,
    deployedAt: new Date().toISOString(),
  });
});

app.post('/api/echo', (req, res) => {
  const { text } = req.body;
  if (!text) return res.status(400).json({ error: '텍스트를 입력해주세요.' });
  res.json({ echo: text, length: text.length });
});

// Fallback to index.html for unknown routes
app.get('*', (req, res) => {
  res.sendFile(path.join(__dirname, 'public', 'index.html'));
});

app.listen(PORT, () => {
  console.log(`서버 실행 중: http://localhost:${PORT}`);
});