const express = require('express');
const bodyParser = require('body-parser');
const fs = require('fs');
const path = require('path');
const { exec } = require('child_process');
const { updateConfig } = require('./index');

// Create Express app
const app = express();
const PORT = process.env.PORT || 3001;

// Middleware
app.use(express.static(__dirname)); // Serve static files
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));

// Route to serve the HTML form
app.get('/', (req, res) => {
  res.sendFile(path.join(__dirname, 'index.html'));
});

// Route to serve the thank you page
app.get('/thank-you.html', (req, res) => {
  res.sendFile(path.join(__dirname, 'thank-you.html'));
});

// API endpoint to handle form submissions
app.post('/calculate', async (req, res) => {
  try {
    console.log('Received form submission');
    const formData = req.body;
    console.log('Form data received:', JSON.stringify(formData, null, 2));
    
    // Update config file with form data
    await updateConfig(formData);
    console.log('Config file updated successfully');
    
    // Run Python script to create Excel file synchronously
    const { execSync } = require('child_process');
    try {
      console.log('Executing Python script...');
      const stdout = execSync('python3 create_excel.py', { encoding: 'utf8' });
      console.log(`Python script output: ${stdout}`);
      
      // Send success response after Python script completes
      res.json({
        success: true,
        message: 'Form data saved and Excel file created successfully'
      });
      console.log('Success response sent');
    } catch (execError) {
      console.error(`Error executing Python script: ${execError.message}`);
      if (execError.stderr) {
        console.error(`stderr: ${execError.stderr}`);
      }
      
      // Send error response for Python script failure
      res.status(500).json({
        success: false,
        message: 'Error creating Excel file',
        error: execError.message
      });
      console.error('Error response sent for Python script failure');
    }
  } catch (error) {
    console.error('Error processing form data:', error);
    console.error('Error stack:', error.stack);
    res.status(500).json({
      success: false,
      message: 'Error processing form data',
      error: error.message
    });
    console.error('Error response sent');
  }
});

// Start the server
app.listen(PORT, () => {
  console.log(`Server running on port ${PORT}`);
});