// Creating our own Emitter property //
//////////////////////////////////////
// if your using a core node property you don't need the ./ before the property
// ./ is if you're lookign for somethign on the same file level
// THIS FILE USES THE INTERNAL NODE EVENT EMITTER
var Emitter = require('events');
// events is the property of the config.js object you're looking for
var eventListener = require('./config').events;

var emtr = new Emitter();

emtr.on(eventListener.GREET, function(){
    console.log('hellloooo okay? using the INTERNAL NODE EVENT EMITTER')
});

emtr.on(eventListener.GREET, function(){
    console.log('A greeeting occuredz');
})

// 'boom' is the triggerz
emtr.emit(eventListener.GREET);

// basically this is an event listener but modular, which you technically can't do in JS
// 'events' is a listener.
// 1) set require('events') to a variable
// 2) make a new object with that constuctor
// 3) create a trigger string with that new object
// 4) to which you can call a function on

// 5) best to set the string as an object because you may mistype the string and it'd be hard to debug
// do that in a new file (config.js) or whatever

 //////////////////////////////////////
// OR USING NODE'S EMITTER PROPERTY //
/////////////////////////////////////
// util & events are built in Node methods
// events contains .emit and .on
var EventEmitter = require('events');
var util = require('util');

function Greetr() {
    this.greeting = "Hello worldz!";
}

// sets up the prototype chain so that any objects created on Greetr will also find the prototype on EventEmitter
// giving the Greetr object access to all the methods and props EventEmitter has access to, like .on and .emit
util.inherits(Greetr, EventEmitter);

Greetr.prototype.greet = function(data) {
    console.log(this.greeting + " " + data); // "Hello worldz!" + data from the function call at bottom
    // the magic string from the .on method below called from the prototype chain
    this.emit('greet', data);
}

// greeter1 has access to the props of both Greetr and EventEmitter
var greeter1 = new Greetr();

greeter1.on('greet', function() {
    console.log('Someone greeted, yo! ' + data);
});
greeter1.greet("I'm the data");



 //////////////////////////////////////
// EMITTER PROPERTY WORKING EXAMPLE //
/////////////////////////////////////
var util = require('util');

function Person() {
	this.firstname = 'John';
	this.lastname = 'Doe';
}

// Person.prototype has access to both Person & Policeman object Constuctors
Person.prototype.greet = function() {
	console.log('Hello ' + this.firstname + ' ' + this.lastname + ' for badge ' + this.badgenumber);
}

function Policeman() {
    // this line is used to grab the properties of the Person object for Policeman
    // otherwise they'd be undefined when running proto.greet on new Policeman
	Person.call(this);
	this.badgenumber = '1234';
}

// says Policeman should inherit from Person
// gives Policeman the properties of Person (i.e. .firstname, .lastname)
// won't work without this b/c it means there is no new Policeman
util.inherits(Policeman, Person);
var officer = new Policeman();
officer.greet();