import express from 'express';
import cors from 'cors';
import dotenv from 'dotenv';
import path from 'path';
import { fileURLToPath } from 'url';

// Routes
import authRoutes from './routes/auth.js';
import kundenRoutes from './routes/kunden.js';
import artikelRoutes from './routes/artikel.js';
import lieferungenRoutes from './routes/lieferungen.js';
import ruecknahmenRoutes from './routes/ruecknahmen.js';
import mitarbeiterRoutes from './routes/mitarbeiter.js';

dotenv.config();

const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);

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

// Middleware
app.use(cors());
app.use(express.json());
app.use(express.urlencoded({ extended: true }));

// Statische Dateien (Uploads)
app.use('/uploads', express.static(path.join(__dirname, 'uploads')));

// Health Check
app.get('/health', (req, res) => {
  res.json({ status: 'OK', timestamp: new Date().toISOString() });
});

// API Routes
app.use('/api/auth', authRoutes);
app.use('/api/kunden', kundenRoutes);
app.use('/api/artikel', artikelRoutes);
app.use('/api/lieferungen', lieferungenRoutes);
app.use('/api/ruecknahmen', ruecknahmenRoutes);
app.use('/api/mitarbeiter', mitarbeiterRoutes);

// Error Handler
app.use((err, req, res, next) => {
  console.error('Fehler:', err);
  
  if (err.name === 'MulterError') {
    if (err.code === 'LIMIT_FILE_SIZE') {
      return res.status(400).json({ error: 'Datei zu groß (max. 10MB)' });
    }
    return res.status(400).json({ error: err.message });
  }
  
  res.status(err.status || 500).json({
    error: err.message || 'Interner Serverfehler'
  });
});

// 404 Handler
app.use((req, res) => {
  res.status(404).json({ error: 'Route nicht gefunden' });
});

// Server starten
app.listen(PORT, '0.0.0.0', () => {
  console.log(`🚀 Backend-Server läuft auf Port ${PORT}`);
  console.log(`📊 Health Check: http://localhost:${PORT}/health`);
  console.log(`🔐 API Base URL: http://localhost:${PORT}/api`);
});

export default app;