var casper = require('casper').create();
var users = ['mikeyaworski', 'PewDiePie']; // array of YouTube users
var j = 0;

casper.start();

console.log("\nYouTube:\n");

for (var i = 0; i < users.length; i++)
{
    casper.thenOpen("https://youtube.com/" + users[i], function() {
        
        var subscribers = this.evaluate(function() {
            return document.querySelector('span.yt-subscription-button-subscriber-count-branded-horizontal.subscribed').innerText;
        });
        j++;
        this.echo(users[j-1] + ":\nSubscribers: " + subscribers);
    });
    
    casper.thenOpen("https://youtube.com/user/" + users[i] + "/videos?view=0&flow=grid&sort=p", function() {
        
        // link to most viewed video
        var link = this.evaluate(function() {
            return document.querySelector('a.yt-uix-sessionlink.yt-uix-tile-link.spf-link.yt-ui-ellipsis.yt-ui-ellipsis-2').getAttribute('href');
        });
		
        // open the most viewed video
        casper.thenOpen("http://youtube.com" + link, function() {
            
            var views = this.evaluate(function() {
                return document.querySelector('span.watch-view-count').innerText;
            });
        
            var likes = this.evaluate(function() {
                return document.querySelector('span.likes-count').innerText;
            });
            var dislikes = this.evaluate(function() {
                return document.querySelector('span.dislikes-count').innerText;
            });

            var date = this.evaluate(function() {
                return document.querySelector('span.watch-video-date').innerText;
            });
            
            // doesn't work
            var comments = this.evaluate(function() {
                return document.querySelector('div.DJa').innerHTML;
            });
            
            var v = "";
            if (views != null ) {
                if (views.indexOf("views") < 0) { // if doesn't already contain word "views"
                    v = " views";
                }
            }
            
            var title = this.getTitle();
            title = title.substring(0, title.length - 10);
            
            this.echo('Most viewed video: ' + title + " - " + views + v + "\n                   " + date + "\n                   Likes: " + likes + "     Dislikes: " + dislikes + "\n                   Comments: " + comments + '\n');
            
        });
    });    
}

casper.run();

              Created: February 17, 2014
Completed in full by: Michael Yaworski