var express = require('express');
var mixin = require('utils-merge');
var proto = require('./server');
var util = require('./util');
var http = require('http');

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

    mixin(app, proto);

    app.options = {
        host: '0.0.0.0',
        port: null,
        server: null,
        debug: false,
        timeout: 5000,
        key: 'peerjs',
        ip_limit: 5000,
        concurrent_limit: 5000,
        ssl: {},
        path: '/',
        allow_discovery: false
    };

    mixin(app.options, options);

    // Print warning if only one of the two is given.
    if (Object.keys(app.options.ssl).length === 1) {
        util.prettyError('Warning: PeerServer will not run on an HTTPS server' +
            ' because either the key or the certificate has not been provided.');
    }

    app.options.ssl.name = 'PeerServer';

    if (app.options.path[0] !== '/') {
        app.options.path = '/' + app.options.path;
    }
    if (app.options.path[app.options.path.length - 1] !== '/') {
        app.options.path += '/';
    }

    // Connected clients
    app._clients = {};

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

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

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

    app._setCleanupIntervals();

    app._server = options.server;

    if (!app._server) {
        throw new Error('Server is not passed to constructor - can\'t start PeerServer');
    }

    app._initializeWSS();

    return app;
}

exports = module.exports = createPeerServer;