/*
Takes provided terms passed as arguments and query google for the number of
estimated results each have.

Usage:
    $ casperjs googlematch.js nicolas chuck borris
    nicolas: 69600000
    chuck:   49500000
    borris:  2370000
    winner is "nicolas" with 69600000 results
*/

var casper = require('casper').create({
    verbose: true
});

casper.fetchScore = function() {
    return this.evaluate(function() {
        var result = document.querySelector('#resultStats').innerText;
        return ~~(/Environ ([0-9\s]{1,}).*/.exec(result)[1].replace(/\s/g, ''));
    });
};

var terms = casper.cli.args;

if (terms.length < 3) {
    casper
        .echo("Usage: $ casperjs googlematch.js term1, term2 [, term3]...")
        .exit(1)
    ;
}

var scores = [];

casper.echo("Let the match begin between \"" + (terms.join('", "')) + "\"!");

casper.start("http://google.fr/");

casper.each(terms, function(self, term, i) {
    self.then(function(self) {
        self.fill('form[action="/search"]', { q: term }, true);
    }).then(function(self) {
        var score = self.fetchScore();
        scores.push({
            term:  term,
            score: score
        });
        self.echo(term + ': ' + score);
    });
});

casper.run(function(self) {
    scores.sort(function(a, b) {
            return b.score - a.score;
    });
    var winner = scores[0];
    self.echo('winner is "' + winner.term + '" with ' + winner.score + ' results');
    self.exit();
});