#!/usr/bin/env node

require('long-stack-traces');

var urlUtils = require('url')
    , util = require('util')
    , nopt = require('nopt')
    , EventEmitter = require('events').EventEmitter
    , _ = require('underscore')
    , socketio = require('socket.io-client');

var opts = {
  host: String
  , port: Number
  , concurrency: Number
  , time: Number
  , delay: Number
  , log: Boolean
  , verbose: Boolean
}
, shorts = {
  h: '--host'
  , p: '--port'
  , c: '--concurrency'
  , t: '--time'
  , d: '--delay'
  , l: '--log'
  , v: '--verbose'
}
, parsed = nopt(opts, shorts)


var seeds = 0;
function StressTest(url, opts) {
  this.clients = {};
  this.url = url;
  this.opts = _.extend({
    concurrency: 10 // clients
    , time: 10 // sec
    , delay: 10 // ms
  }, opts);
}
util.inherits(StressTest, EventEmitter);
StressTest.prototype.start = function(callback) {
  for(var i = 0; i < this.opts.concurrency; i++) {
    this.addClient();
  }

  var start = +new Date();

  var send = function() {
    _.each(this.clients, function(client, id) {
      client.send({
        type: 'COLLABROOM'
        , component: 'pad'
        , data: {
          type: 'USER_CHANGES'
          , baseRev: 41
          , changeset: 'Z:1h>3|8=1g*0+3$adf'
          , apool: {
            numToAttrib: {}
            , nextNum: 1
          }
        }
      });
    });
    var lapsed = (new Date() - start) / 1000;
    if(lapsed < this.time) {
      this.setTimeout(send, delay);
    } else {
      callback && process.nextTick(callback);
    }
  }
  send();
}
StressTest.prototype.addClient = function(client) {
  var urlObj = urlUtils.parse(this.url);
  console.error(urlObj);
  client = client || socketio.connect(urlObj.protocol + '://' + urlObj.host, {
    resource: urlObj.pathname
  });
  client.id = seeds++;
  this.clients[client.id] = client;

  var onError = function() {
    var args = Array.prototype.slice.call(arguments);
    args.unshift('error', client);
    this.emit.apply(this, args);
  }
  client.on('error', onError);
}

var opts = {}
  , url = parsed.remain && parsed.remain[0] || '/socket.io'
  , urlObj = urlUtils.parse(url);

opts.host = parsed.host || urlObj.hostname || 'localhost';

urlObj.protocol = 'http:';
urlObj.hostname = parsed.host || urlObj.hostname || 'localhost';
urlObj.port = parsed.port || urlObj.port || 9001;
url = urlUtils.format(urlObj);

var test = new StressTest(url, parsed);
test.on('error', console.error)
    .start();