import express from 'express';
import cors from 'cors';
import sqlite3 from 'sqlite3';
import { open } from 'sqlite';
import dotenv from 'dotenv';
import path from 'path';

dotenv.config();

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

// Middleware
app.use(cors());
app.use(express.json());

// Database connection
let db;
async function initializeDatabase() {
  try {
    db = await open({
      filename: './database.sqlite',
      driver: sqlite3.Database
    });

    await db.exec(`
      CREATE TABLE IF NOT EXISTS events (
        id INTEGER PRIMARY KEY AUTOINCREMENT,
        title TEXT NOT NULL,
        description TEXT,
        date TEXT NOT NULL,
        location TEXT,
        created_at TEXT DEFAULT CURRENT_TIMESTAMP
      )
    `);
    console.log('Database initialized successfully');
  } catch (error) {
    console.error('Error initializing database:', error);
  }
}

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

// API Routes
app.get('/api/events', async (req, res) => {
  try {
    const rows = await db.all('SELECT * FROM events');
    console.log('Fetched events:', rows);
    res.json(rows);
  } catch (error) {
    console.error('Error fetching events:', error);
    res.status(500).json({ 
      error: 'Internal server error',
      details: error instanceof Error ? error.message : 'Unknown error'
    });
  }
});

app.post('/api/events', async (req, res) => {
  try {
    const { title, description, date, location } = req.body;
    console.log('Creating event with data:', { title, description, date, location });
    const result = await db.run(
      'INSERT INTO events (title, description, date, location) VALUES (?, ?, ?, ?)',
      [title, description, date, location]
    );
    console.log('Event created:', result);
    res.status(201).json(result);
  } catch (error) {
    console.error('Error creating event:', error);
    res.status(500).json({ 
      error: 'Internal server error',
      details: error instanceof Error ? error.message : 'Unknown error'
    });
  }
});

// Serve the React app for all other routes
app.get('*', (req, res) => {
  res.sendFile(path.join(__dirname, '../frontend/build/index.html'));
});

// Start server
app.listen(port, () => {
  console.log(`Server running on port ${port}`);
  initializeDatabase();
});