Scroll and take screenshots

smartScreenshot.js

exports.smartScreenshot = function(driver, filepath){
	return new Promise(function(resolve, reject){
		function scrollAndShoot(position, iteration, repetitions, viewHeight){
			driver.scroll(0, position).then(function(){
				var p = filepath + '_' + iteration + '.png';
				driver.saveScreenshot(p).then(function(){
					iteration++;
					if(iteration > repetitions){
						//todo
						//https://wiki.saucelabs.com/display/DOCS/Annotating+Tests+with+the+Sauce+Labs+REST+API
						return resolve()
					}
					scrollAndShoot(position + viewHeight, iteration, repetitions, viewHeight);

				}).catch(function(err){reject('unable to save screenshot: ' + err)});

			}).catch(function(err){reject('unable to scroll: ' + err)});
		};//end scrollAndShoot
		driver.getViewportSize('height').then(function(result){
			var viewHeight = result;
			driver.elements('body > *').then(function(result){
				var bottomElement = result.value.pop().ELEMENT;
				driver.elementIdName(bottomElement).then(function(result){
					driver.elementIdLocation(bottomElement).then(function(result){
						var footerLocation = result.value.y;
						driver.elementIdSize(bottomElement).then(function(result){
							var footerSize = result.value.height;
							//currently cannot measure size of page so must do this
							// console.log('location', footerLocation);
							// console.log('footer size', footerSize);
							// console.log('viewHeight', viewHeight);
							var pageSize = footerLocation + footerSize;
							var repetitions = Math.ceil(pageSize / viewHeight);
							// console.log('repetitions', repetitions);
							var i = 1;
							scrollAndShoot(0, i, repetitions, viewHeight);

						});
					});

				});
			});


		}).catch(function(err){reject('unable to get height:' + err)});
	});//end promise

};//end smart screenshot