const express = require('express');
const path = require('path');
const bodyParser = require('body-parser');
const crypto = require('crypto');
const { exec } = require('child_process');
require('dotenv').config();

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

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

// Middleware to parse JSON payloads
app.use(bodyParser.json());

// Custom middleware to handle URLs without .html for specific routes
app.use((req, res, next) => {
  // Extract the path without any query parameters
  const urlPath = req.path.split('?')[0];

  // Define routes that should render HTML files without .html extension
  const htmlRoutes = ['/about', '/list', '/gallery'];

  // Check if the requested path is in the htmlRoutes array
  if (htmlRoutes.includes(urlPath)) {
    // Append .html to the path and continue
    req.url += '.html';
  }

  // Continue to the next middleware
  next();
});

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

// Routes to serve the HTML files without .html extension
app.get('/about.html', (req, res) => {
  res.sendFile(path.join(__dirname, 'public', 'about.html'));
});

app.get('/list.html', (req, res) => {
  res.sendFile(path.join(__dirname, 'public', 'list.html'));
});

app.get('/gallery.html', (req, res) => {
  res.sendFile(path.join(__dirname, 'public', 'gallery.html'));
});

// Serve articles without .html extension
app.get('/articles/:articleName', (req, res) => {
  const articleName = req.params.articleName;
  res.sendFile(path.join(__dirname, 'public/articles', `${articleName}.html`));
});

// Webhook handler
app.post('/api', (req, res) => {
  console.log(req)
  const signature = req.headers['x-gitea-signature'];
  const payload = JSON.stringify(req.body);

  if (!signature || !payload) {
    return res.status(400).send('Invalid payload or missing signature');
  }

  // Verify the secret
  const hmac = crypto.createHmac('sha256', GITEA_SECRET);
  const digest = `sha256=${hmac.update(payload).digest('hex')}`;

  // Ensure both buffers have the same length before comparing
  const bufferSignature = Buffer.from(signature);
  const bufferDigest = Buffer.from(digest);

  console.log(bufferDigest.length, bufferSignature.length)

  if (bufferSignature.length === bufferDigest.length && crypto.timingSafeEqual(bufferSignature, bufferDigest)) {
    // Secret is valid, update the repository
      res.status(200).send('Repository updated successfully');
  } else {
    res.status(401).send('Invalid secret');
  }
});

// Error handling
app.use((err, req, res, next) => {
  console.error(err.stack);
  res.status(500).send('Something broke!');
});

// Start the server
app.listen(PORT, (err) => {
  if (err) {
    console.error('Error starting the server:', err);
    process.exit(1);
  }
  console.log(`Server is running on http://localhost:${PORT}`);
});