(function ($) {
    $.extend({
        simpleWeather: function (options) {
            var options = $.extend({
                zipcode: '76309',
                location: '',
                unit: 'f',
                success: function (weather) { },
                error: function (message) { }
            }, options);

            now = new Date(); //cachebust

            var weatherUrl = 'http://query.yahooapis.com/v1/public/yql?format=json&rnd=' + now.getFullYear() + now.getMonth() + now.getDay() + now.getHours() + '&diagnostics=true&callback=?&diagnostics=true&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys&q=';
            if (options.location != '')
                weatherUrl += 'select * from weather.forecast where location in (select id from weather.search where query="' + options.location + '") and u="' + options.unit + '"';
            else if (options.zipcode != '')
                weatherUrl += 'select * from weather.forecast where location in ("' + options.zipcode + '") and u="' + options.unit + '"';
            else {
                options.error("No location given.");
                return false;
            }

            $.getJSON(
				weatherUrl,
				function (data) {
				    if (data != null && data.query.results != null) {
				        $.each(data.query.results, function (i, result) {
				            if (result.constructor.toString().indexOf("Array") != -1)
				                result = result[0];

				            currentDate = new Date();
				            sunRise = new Date(currentDate.toDateString() + ' ' + result.astronomy.sunrise);
				            sunSet = new Date(currentDate.toDateString() + ' ' + result.astronomy.sunset);
				            if (currentDate > sunRise && currentDate < sunSet)
				                timeOfDay = 'd';
				            else
				                timeOfDay = 'n';

				            compass = ['N', 'NNE', 'NE', 'ENE', 'E', 'ESE', 'SE', 'SSE', 'S', 'SSW', 'SW', 'WSW', 'W', 'WNW', 'NW', 'NNW', 'N'];
				            windDirection = compass[Math.round(result.wind.direction / 22.5)];

				            if (result.item.condition.temp < 80 && result.atmosphere.humidity < 40)
				                heatIndex = -42.379 + 2.04901523 * result.item.condition.temp + 10.14333127 * result.atmosphere.humidity - 0.22475541 * result.item.condition.temp * result.atmosphere.humidity - 6.83783 * (Math.pow(10, -3)) * (Math.pow(result.item.condition.temp, 2)) - 5.481717 * (Math.pow(10, -2)) * (Math.pow(result.atmosphere.humidity, 2)) + 1.22874 * (Math.pow(10, -3)) * (Math.pow(result.item.condition.temp, 2)) * result.atmosphere.humidity + 8.5282 * (Math.pow(10, -4)) * result.item.condition.temp * (Math.pow(result.atmosphere.humidity, 2)) - 1.99 * (Math.pow(10, -6)) * (Math.pow(result.item.condition.temp, 2)) * (Math.pow(result.atmosphere.humidity, 2));
				            else
				                heatIndex = result.item.condition.temp;

				            var weather = {
				                title: result.item.title,
				                temp: result.item.condition.temp,
				                code: result.item.condition.code,
				                units: {
				                    temp: result.units.temperature,
				                    distance: result.units.distance,
				                    pressure: result.units.pressure,
				                    speed: result.units.speed
				                },
				                currently: result.item.condition.text,
				                high: result.item.forecast[0].high,
				                low: result.item.forecast[0].low,
				                forecast: result.item.forecast[0].text,
				                wind: {
				                    chill: result.wind.chill,
				                    direction: windDirection,
				                    speed: result.wind.speed
				                },
				                humidity: result.atmosphere.humidity,
				                heatindex: heatIndex,
				                pressure: result.atmosphere.pressure,
				                rising: result.atmosphere.rising,
				                visibility: result.atmosphere.visibility,
				                sunrise: result.astronomy.sunrise,
				                sunset: result.astronomy.sunset,
				                description: result.item.description,
				                thumbnail: "http://l.yimg.com/a/i/us/nws/weather/gr/" + result.item.condition.code + timeOfDay + "s.png",
				                image: "http://l.yimg.com/a/i/us/nws/weather/gr/" + result.item.condition.code + timeOfDay + ".png",
				                tomorrow: {
				                    high: result.item.forecast[1].high,
				                    low: result.item.forecast[1].low,
				                    forecast: result.item.forecast[1].text,
				                    code: result.item.forecast[1].code,
				                    date: result.item.forecast[1].date,
				                    day: result.item.forecast[1].day,
				                    image: "http://l.yimg.com/a/i/us/nws/weather/gr/" + result.item.forecast[1].code + "d.png"
				                },
				                city: result.location.city,
				                country: result.location.country,
				                region: result.location.region,
				                updated: result.item.pubDate,
				                link: result.item.link
				            };

				            options.success(weather);
				        });
				    } else {
				        if (data.query.results == null)
				            options.error("Invalid location given.");
				        else
				            options.error("Weather could not be displayed. Try again.");
				    }
				}
			);
            return this;
        }
    });
})(jQuery);