/*jslint node:true,browser:true*/
var fs = require('fs');
var cookieFile = 'cookies.json';
var credentialFile = 'credential.json';


var casper = require('casper').create({
    pageSettings: {
        loadImages: false,//The script is much faster when this field is set to false
        loadPlugins: false,
        userAgent: 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2403.157 Safari/537.36'
    }
});
 

function loadCredentials() {
	var credentials;
	var txt;
	console.log("loadCredential");
	if (fs.exists(credentialFile)) {
		txt = fs.read(credentialFile);
		credentials = JSON.parse(txt);
	}
	console.log("/loadCredential");
	return credentials;
}

function readCookies(page) {
	console.log("readCookies");
	var cookies = JSON.parse(fs.read(cookieFile));
	page.cookies = cookies;
	console.log(cookies);
}

function saveCookies(page) {
	console.log("saveCookies");
	var cookies = JSON.stringify(page.cookies); 
	console.log(cookies);
  	fs.write(cookieFile, cookies, 'w');
}

//First step is to open Facebook
casper.start().thenOpen("https://facebook.com", function() {
	readCookies(this.page);
    console.log("Facebook website opened");
    saveCookies(this.page);
});
 
 
//Now we have to populate username and password, and submit the form
casper.then(function(){
	var credentials;
	credentials = loadCredentials();
	readCookies(this.page);
    console.log("Login using username " + credentials.email + " and password");

    this.evaluate(function(credentials){
        document.getElementById("email").value = credentials.email;
		document.getElementById("pass").value = credentials.pass;
		document.getElementById("loginbutton").children[0].click();
    }, credentials);
    saveCookies(this.page);
});
 
//Wait to be redirected to the Home page, and then make a screenshot
casper.then(function(){
    console.log("Make a screenshot and save it as AfterLogin.png");
	this.wait(6000);//Wait a bit so page loads (there are a lot of ajax calls and that is why we are waiting 6 seconds)
    this.capture('AfterLogin.png');
});

/*
//Get all images greater than 100x100 pixels
casper.then(function(){
	var images = this.evaluate(function(){
		var facebookImages = document.getElementsByTagName('img'); 
		var allSrc = [];
		var i;
		for(i = 0; i < facebookImages.length; i++) {
			if(facebookImages[i].height >= 100 && facebookImages[i].width >= 100){
				allSrc.push(facebookImages[i].src);
			}
		}
		return JSON.stringify(allSrc);
	});
	console.log(images);
});
 */

casper.run();