// Copyright (C) Ikkei Shimomura (tea) <Ikkei.Shimura@gmail.com>

'use strict';

var EventEmitter = require('events').EventEmitter;
var util = require('util');
var _ = require('lodash');

/**
 * @name VoteManager
 * @description
 * @param {number} timeout in seconds.
 * @param {number} threshold
 * @param {number} total count of members
 */
function VoteManager(timeout, threshold, total) {

  if (!(this instanceof VoteManager)) {
    return new VoteManager(timeout, threshold, total);
  }
  EventEmitter.call(this);

  var self = this;
  this.timeout = (timeout) ? timeout : 60; /* seconds */
  this.threshold = (threshold) ? threshold : 50; /* fifty percents */
  this.total = (total) ? total : 0;
  this.expire = null;
  this.assentors = {};

  this.on('update-total', function updateTotal(total) {
    self.total = total;
  });

  this.on('vote', this.vote);
}
util.inherits(VoteManager, EventEmitter);

/**
 * @private
 * @description current time since midnight January 1, 1970
 * @return {number} miliseconds
 */
var getCurrentTime = function getCurrentTime() {
  return new Date.getTime();
};

/**
 * Listener for vote event.
 * This takes three stages Start/Vote/Pass.
 *
 * @param {string} user name should be an unique.
 * @param {number} now_ assigned to local variable for unit test.
 */
VoteManager.prototype.vote = function vote(user, now_) {

  // given as argument in unit test
  var now = (now_) ? now_ : getCurrentTime();

  // Started
  if (this.expire !== null) {
    this.expire = now + this.timeout * 1000; /* ms */
    this.emit('started', user, now);
  }

  // Voted
  if (this.expire > now) {
    // TODO: if user was already voted?
    this.assentors[user] = now;
    this.emit('voted', user, now);
  }

  // Passed
  if (_.keys(this.assentors).length / this.total * 100 >= this.threshold) {
    this.reset();
    this.emit('passed');
  }
};

/**
 * @description
 */
VoteManager.prototype.reset = function reset() {

  this.expire = null;
  this.assentors = {};
};

module.exports = VoteManager;

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@@ -1089,16 +1089,17 @@
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@@ -1094,16 +1094,19 @@
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@@ -1484,17 +1484,17 @@
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Add test for VoteManager