#!/usr/bin/env node

/**
 * Setup the debug paramater.
 */

process.env.DEBUG = process.env.TALK_DEBUG;

/**
 * Module dependencies.
 */

const app = require('../app');
const debug = require('debug')('talk:server');
const http = require('http');
const initPromise = require('../init');
const port = normalizePort(process.env.TALK_PORT || '3000');

let server;

initPromise
  .then(() => {
    /**
    * Get port from environment and store in Express.
    */

    app.set('port', port);

    /**
    * Create HTTP server.
    */

    server = http.createServer(app);

    /**
    * Listen on provided port, on all network interfaces.
    */

    server.listen(port);
    server.on('error', onError);
    server.on('listening', onListening);
  });

/**
 * Normalize a port into a number, string, or false.
 */

function normalizePort(val) {
  let port = parseInt(val, 10);

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

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

  return false;
}

/**
 * Event listener for HTTP server "error" event.
 */

function onError(error) {
  if (error.syscall !== 'listen') {
    throw error;
  }

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

  // handle specific listen errors with friendly messages
  switch (error.code) {
  case 'EACCES':
    console.error(`${bind} requires elevated privileges`);
    break;
  case 'EADDRINUSE':
    console.error(`${bind} is already in use`);
    break;
  }

  throw error;
}

/**
 * Event listener for HTTP server "listening" event.
 */

function onListening() {
  let addr = server.address();
  let bind = typeof addr === 'string'
    ? `pipe ${  addr}`
    : `port ${  addr.port}`;
  debug(`Listening on ${  bind}`);
}