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var beginGetForecast = function () {
	var progress = document.getElementById('progress');
	
	progress.style.display = '';
	
	getForecastSequential([ 
		{ name: 'Aarhus, Denmark', woeid: '552015' }, 
		{ name: 'New York, USA', woeid: '2459115' },
		{ name: 'Moscow, Russia', woeid: '2122265' } ], 
		
		function() { 
			progress.style.display = 'none';
		}
	);
}

var getForecastSequential = function(places, onComplete) {
	var output = document.getElementById('forecast');
	
	// Instantiating the queue object
	var queue = new Dynamicweb.Utilities.RequestQueue();

	output.innerHTML = '';
	
	for (var i = 0; i < places.length; i++) {
		(function(p) {
			// Adding new task to the queue.
			// First argument: context in which the function is called.
			// Second argument: function to be called.
			// Third argument: An array of parameters to be passed to the function.
			queue.add(window, getForecast, [ p, function (result) { 
				output.innerHTML += '<div>' + result.name + ', ' + result.date + ': ' + result.text + '</div>';
				
				// "Next" will start executing the next function.
				// Returns: Value indicating whether there still was something to be executed.
				if (!queue.next()) {
					onComplete(); 
				}
			} ]);
		})(places[i]);
	}
	
	// Beginning the execution of queued tasks
	queue.executeAll();
}

var getForecast = function (place, onComplete) {
	var query = encodeURIComponent('select item.forecast from weather.forecast where woeid = "' + place.woeid + '"');
					
	var url = 'http://query.yahooapis.com/v1/public/yql?q=' + query + '&format=json&callback=?';
	
	$.getJSON(url, function (data) {
		var result = data.query.results.channel[0].item.forecast;
		
		onComplete({ name: place.name, date: result.date, text: result.text });
	});
}