'use strict';

// Load the module dependencies
var config = require('../config'),
  path = require('path'),
  fs = require('fs'),
  http = require('http'),
  https = require('https'),
  cookieParser = require('cookie-parser'),
  passport = require('passport'),
  socketio = require('socket.io'),
  moment = require('moment'),
  session = require('express-session'),
  MongoStore = require('connect-mongo')(session);

// Define the Socket.io configuration method
module.exports = function (app, db) {
  var server;
  if (config.secure && config.secure.ssl === true) {
    // Load SSL key and certificate
    var privateKey = fs.readFileSync(path.resolve(config.secure.privateKey), 'utf8');
    var certificate = fs.readFileSync(path.resolve(config.secure.certificate), 'utf8');
    var caBundle;

    try {
      caBundle = fs.readFileSync(path.resolve(config.secure.caBundle), 'utf8');
    } catch (err) {
      console.log('Warning: couldn\'t find or read caBundle file');
    }

    var options = {
      key: privateKey,
      cert: certificate,
      ca: caBundle,
      //  requestCert : true,
      //  rejectUnauthorized : true,
      secureProtocol: 'TLSv1_method',
      ciphers: [
        'ECDHE-RSA-AES128-GCM-SHA256',
        'ECDHE-ECDSA-AES128-GCM-SHA256',
        'ECDHE-RSA-AES256-GCM-SHA384',
        'ECDHE-ECDSA-AES256-GCM-SHA384',
        'DHE-RSA-AES128-GCM-SHA256',
        'ECDHE-RSA-AES128-SHA256',
        'DHE-RSA-AES128-SHA256',
        'ECDHE-RSA-AES256-SHA384',
        'DHE-RSA-AES256-SHA384',
        'ECDHE-RSA-AES256-SHA256',
        'DHE-RSA-AES256-SHA256',
        'HIGH',
        '!aNULL',
        '!eNULL',
        '!EXPORT',
        '!DES',
        '!RC4',
        '!MD5',
        '!PSK',
        '!SRP',
        '!CAMELLIA'
      ].join(':'),
      honorCipherOrder: true
    };

    // Create new HTTPS Server
    server = https.createServer(options, app);
  } else {
    // Create a new HTTP server
    server = http.createServer(app);
  }
  // Create a new Socket.io server
  var io = socketio.listen(server);
  io.chatClients = [];
  io.banClients = [];

  // Create a MongoDB storage object
  var mongoStore = new MongoStore({
    mongooseConnection: db.connection,
    collection: config.sessionCollection
  });

  // Intercept Socket.io's handshake request
  io.use(function (socket, next) {
    // Use the 'cookie-parser' module to parse the request cookies
    cookieParser(config.sessionSecret)(socket.request, {}, function (err) {
      // Get the session id from the request cookies
      var sessionId = socket.request.signedCookies ? socket.request.signedCookies[config.sessionKey] : undefined;

      if (!sessionId) return next(new Error('sessionId was not found in socket.request'), false);

      // Use the mongoStorage instance to get the Express session information
      mongoStore.get(sessionId, function (err, session) {
        if (err) return next(err, false);
        if (!session) return next(new Error('session was not found for ' + sessionId), false);

        // Set the Socket.io session information
        socket.request.session = session;

        // Use Passport to populate the user details
        passport.initialize()(socket.request, {}, function () {
          passport.session()(socket.request, {}, function () {
            if (socket.request.user) {
              var logined = false;
              var banned = false;

              //init user
              initUser(socket.request.user);

              // check user already login
              io.chatClients.forEach(function (s) {
                if (s.request.user.username === socket.request.user.username) {
                  logined = true;
                  next(new Error('username "' + socket.request.user.username + '" already login from other location'), false);
                }
              });
              // check ban list
              if (!logined) {
                for (var i = io.banClients.length - 1; i >= 0; i--) {
                  var buser = io.banClients[i];
                  if (buser.expires <= Date.now()) {  //already expires, remove it
                    io.banClients.splice(io.banClients.indexOf(buser), 1);
                    continue;
                  } else {
                    var address = socket.handshake.address;
                    if (buser.user.username === socket.request.user.username) { //username in ban list
                      banned = true;
                      next(new Error('username "' + buser.user.username + '" is banned from the server'), false);
                    } else if (buser.ip === address) { //ip in ban list
                      banned = true;
                      next(new Error('ip "' + buser.ip + '" is banned from the server'), false);
                    }
                  }
                }
              }

              if (!logined && !banned) {
                next(null, true);
              }
            } else {
              next(new Error('User is not authenticated'), false);
            }
          });
        });
      });
    });
  });

  // init user isOper/isAdmin/isVip
  function initUser(user) {
    user.isVip = false;

    if (!user.vip_start_at || !user.vip_end_at) {
      user.isVip = false;
    } else if (moment(Date.now()) > moment(user.vip_end_at)) {
      user.isVip = false;
    } else {
      user.isVip = true;
    }

    user.isOper = (user.roles[0] === 'oper' || user.roles[0] === 'admin');
    user.isAdmin = (user.roles[0] === 'admin');

  }

  // Add an event listener to the 'connection' event
  io.on('connection', function (socket) {
    config.files.server.sockets.forEach(function (socketConfiguration) {
      require(path.resolve(socketConfiguration))(io, socket);
    });
  });

  return server;
};