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

import projectRoutes from './routes/projectRoutes.js';
import messageRoutes from './routes/messageRoutes.js';
import { login } from './controllers/authController.js';
import { getDb } from './config/db.js';

// Load environment variables
dotenv.config();

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

const app = express();
const PORT = process.env.PORT || 5000;

// Middleware
app.use(cors({
  origin: '*', // Adjust this for production security as needed
  methods: ['GET', 'POST', 'PUT', 'DELETE'],
  allowedHeaders: ['Content-Type', 'Authorization']
}));
app.use(express.json());
app.use(morgan('dev'));

// Test route
app.get('/api/health', (req, res) => {
  res.status(200).json({ status: 'UP', message: 'Lyvuha.com portfolio backend is active' });
});

// API Routes
app.post('/api/auth/login', login);
app.use('/api/projects', projectRoutes);
app.use('/api/messages', messageRoutes);

// Database initialization
getDb()
  .then(() => {
    console.log('SQLite database initialized successfully.');
  })
  .catch((err) => {
    console.error('Failed to initialize SQLite database:', err);
  });

// Serve frontend — Docker puts dist at /app/frontend/dist, local dev at ../../frontend/dist
const frontendDistPath = process.env.NODE_ENV === 'production'
  ? path.resolve(__dirname, '../frontend/dist')
  : path.resolve(__dirname, '../../frontend/dist');
app.use(express.static(frontendDistPath));

// Fallback all non-API routes to index.html (SPA routing)
app.get('*', (req, res) => {
  if (req.originalUrl.startsWith('/api')) {
    return res.status(404).json({ success: false, message: 'API Route not found' });
  }
  res.sendFile(path.join(frontendDistPath, 'index.html'));
});

// Global Error Handler
app.use((err, req, res, next) => {
  console.error('Unhandled error:', err);
  res.status(500).json({
    success: false,
    message: 'An unexpected server error occurred'
  });
});

app.listen(PORT, () => {
  console.log(`Backend server running on http://localhost:${PORT} in ${process.env.NODE_ENV || 'development'} mode`);
});