import http from 'http';
import debug from 'debug';

const log = debug('youtube-maze:server');

/**
 * Normalize a port into a number, string, or false.
 */
const normalizePort = val =>
{
    const port = parseInt(val, 10);

    // Named pipe
    if (isNaN(port))
    {
        return val;
    }

    // Port number
    if (port >= 0)
    {
        return port;
    }

    return false;
};

// Instantiate app
import app from '../app.mjs';
const port = normalizePort(process.env.PORT || '3000');
app.set('port', port);

// Create HTTP server
const server = http.createServer(app);
server.listen(port);
server.keepAliveTimeout = 60000;

server.on('error', error => {
    if (error.syscall !== 'listen')
    {
        throw error;
    }

    const bind = typeof port === 'string' ? `Pipe ${port}` : `Port ${port}`;

    // Handle specific listen errors with friendly messages
    switch (error.code)
    {
        case 'EACCES':
            console.error(`${bind} requires elevated privileges`);
            process.exit(1);

        case 'EADDRINUSE':
            console.error(`${bind} is already in use`);
            process.exit(1);

        default:
            throw error;
    }
});

server.on('listening', () => {
    const addr = server.address();
    const bind = typeof addr === 'string'
        ? `pipe ${addr}`
        : `port ${addr.port}`;

    log(`Listening on ${bind}`);
});