var casper, currentPage, processPage;

casper = require('casper').create();
currentPage = 1;

if (casper.cli.args.length === 0) {
  casper.echo("usage: $ casperjs my search terms");
  casper.exit();
}

processPage = function() {
  var url;
  this.echo("capturing page " + currentPage);
  this.capture("google-results-p" + currentPage + ".png");
  if (currentPage >= 5) {
    return;
  }
  if (this.exists("#pnnext")) {
    currentPage++;
    this.echo("requesting next page: " + currentPage);
    url = this.getCurrentUrl();
    return this.thenClick("#pnnext").then(function() {
      return this.waitFor(function() {
        return url !== this.getCurrentUrl();
      }, processPage);
    });
  } else {
    return this.echo("that's all, folks.");
  }
};

casper.start('http://google.fr/', function() {
  return this.fill('form[action="/search"]', {
    q: casper.cli.args.join(' ')
  }, true);
});

casper.then(processPage);

casper.run();