require('dotenv').config();
const express = require('express');
const cors = require('cors');
const cookieParser = require('cookie-parser');
const fs = require('fs');
const path = require('path');

const businessesRoutes = require('./routes/businesses');
const platformRoutes = require('./routes/platform');
const platformPublicRoutes = require('./routes/platformPublic');
const platformWebhookRoutes = require('./routes/platformWebhooks');
const { fdkExtension, isFdkConfigured } = require('./fdk');

const app = express();
const PORT = process.env.PORT || 3001;
const CLIENT_DIST_DIR = [
  path.join(__dirname, 'public'),
  path.join(__dirname, '..', 'client', 'dist'),
].find((dir) => fs.existsSync(path.join(dir, 'index.html')));

app.use(cors({ origin: true, credentials: true }));
app.use(cookieParser('ext.session'));
app.use(express.json({ limit: '10mb' }));
app.use(express.urlencoded({ extended: true }));

// Health check
app.get('/api/health', (req, res) => res.json({
  ok: true,
  timestamp: new Date().toISOString(),
  fdkConfigured: isFdkConfigured,
}));

if (fdkExtension) {
  app.use('/api/platform', platformPublicRoutes);
  app.use('/api/platform', platformWebhookRoutes);
  app.use(fdkExtension.fdkHandler);
  app.use('/api/platform', fdkExtension.platformApiRoutes, platformRoutes);
} else {
  app.use('/api/platform', platformPublicRoutes);
  app.use('/api/platform', platformWebhookRoutes);
  app.use('/api/platform', platformRoutes);
}

// Routes
app.use('/api/businesses', businessesRoutes);

// Serve the built client for same-origin deployment.
if (CLIENT_DIST_DIR) {
  app.use(express.static(CLIENT_DIST_DIR));
}

// Preserve JSON 404s for unknown API routes.
app.use('/api', (req, res) => res.status(404).json({ error: 'Route not found' }));

// SPA fallback for non-API browser routes.
app.use((req, res, next) => {
  if (req.method !== 'GET') {
    return res.status(404).json({ error: 'Route not found' });
  }

  if (!CLIENT_DIST_DIR) {
    return res.status(404).json({ error: 'Route not found' });
  }

  res.sendFile(path.join(CLIENT_DIST_DIR, 'index.html'), (err) => {
    if (err) next(err);
  });
});

// Error handler
app.use((err, req, res, next) => {
  console.error(err.stack);
  res.status(500).json({ error: 'Internal server error' });
});

app.listen(PORT, () => {
  console.log(`SMS Extension server running on port ${PORT}`);
});