const express = require('express');
const path = require('path');
const { readSession, requireAuth } = require('./auth');
const { initDb } = require('./db');

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

app.use(express.json());
app.get('/health', (req, res) => {
  res.json({ status: 'ok' });
});

async function start() {
  await initDb();

  app.use('/api/auth', require('./routes/auth'));
  app.use('/api/records', requireAuth, require('./routes/records'));
  app.use('/api/categories', requireAuth, require('./routes/categories'));
  app.use('/api/statistics', requireAuth, require('./routes/statistics'));
  app.use('/api/balance', requireAuth, require('./routes/balance'));
  app.use('/api/users', requireAuth, require('./routes/users'));

  const clientDist = path.join(__dirname, '..', 'client', 'dist');
  const clientIndex = path.join(clientDist, 'index.html');

  app.use(express.static(clientDist, { index: false }));
  app.get('*', (req, res) => {
    if (req.path.startsWith('/api')) {
      return res.status(404).json({ error: 'API not found' });
    }

    const isAuthenticated = Boolean(readSession(req));

    if (req.path === '/login') {
      if (isAuthenticated) {
        return res.redirect('/');
      }

      return res.sendFile(clientIndex);
    }

    if (!isAuthenticated) {
      return res.redirect(`/login?redirect=${encodeURIComponent(req.originalUrl)}`);
    }

    return res.sendFile(clientIndex);
  });

  app.use((err, req, res, next) => {
    console.error('Server error:', err.message);
    res.status(err.status || 500).json({
      error: err.message || 'Server internal error',
    });
  });

  app.listen(PORT, () => {
    console.log(`Accounting app listening on http://localhost:${PORT}`);
  });
}

start().catch((error) => {
  console.error('Failed to start server:', error);
  process.exitCode = 1;
});