const express = require('express');
const fs = require('fs');
const path = require('path');
const bodyParser = require('body-parser');

const app = express();
const PORT = 3000;

let requestCount = 0;

// Middleware
app.use(bodyParser.json());
app.use((req, res, next) => {
  requestCount++;
  next();
});

// Serve static frontend
app.use(express.static(path.join(__dirname, 'public')));

// Serve input JSON files
app.use('/input', express.static(path.join(__dirname, 'input')));

// Serve output folder (for history.json)
app.use('/output', express.static(path.join(__dirname, 'output')));

// API to save history data
app.post('/save-history', (req, res) => {
  const historyPath = path.join(__dirname, 'output', 'history.json');
  const json = JSON.stringify(req.body, null, 2);

  fs.writeFile(historyPath, json, 'utf8', (err) => {
    if (err) {
      console.error('Error saving history.json:', err);
      res.status(500).send('Failed to save history.json');
    } else {
      console.log('History successfully saved.');
      res.status(200).send('Saved');
    }
  });
});

// Health Check Endpoint
app.get('/health', (req, res) => {
  res.status(200).json({
    status: 'UP',
    requestCount: requestCount
  });
});

// Start server
app.listen(PORT, () => {
  console.log(`Server running at http://localhost:${PORT}`);
});