var express = require('express');
var proto = require('./server');
var util = require('./util');
var http = require('http');
var https = require('https');

function ExpressPeerServer(server, options) {
  var app = express();

  util.extend(app, proto);

  options = app._options = util.extend({
    debug: false,
    timeout: 5000,
    key: 'peerjs',
    ip_limit: 5000,
    concurrent_limit: 5000,
    allow_discovery: false,
    proxied: false
  }, options);

  // Connected clients
  app._clients = {};

  // Messages waiting for another peer.
  app._outstanding = {};

  // Mark concurrent users per ip
  app._ips = {};

  if (options.proxied) {
    app.set('trust proxy', options.proxied);
  }

  app.on('mount', function() {
    if (!server) {
      throw new Error('Server is not passed to constructor - '+
        'can\'t start PeerServer');
    }

    // Initialize HTTP routes. This is only used for the first few milliseconds
    // before a socket is opened for a Peer.
    app._initializeHTTP();
    app._setCleanupIntervals();
    app._initializeWSS(server);
  });

  return app;
}

function PeerServer(options, callback) {
  var app = express();

  options = options || {};
  var path = options.path || '/';
  var port = options.port || 80;

  delete options.path;

  if (path[0] !== '/') {
    path = '/' + path;
  }

  if (path[path.length - 1] !== '/') {
    path += '/';
  }

  var server;
  if (options.ssl) {
    if (options.ssl.certificate) {
      // Preserve compatibility with 0.2.7 API
      options.ssl.cert = options.ssl.certificate;
      delete options.ssl.certificate;
    }

    server = https.createServer(options.ssl, app);
    delete options.ssl;
  } else {
    server = http.createServer(app);
  }

  var peerjs = ExpressPeerServer(server, options);
  app.use(path, peerjs);

  if (callback) {
    server.listen(port, function() {
      callback(server);
    });
  } else {
    server.listen(port);
  }

  return peerjs;
}

exports = module.exports = {
  ExpressPeerServer: ExpressPeerServer,
  PeerServer: PeerServer
};