reorganize for build system

server/scripts/modules/regionalforecastdata.js

@@ -0,0 +1,319 @@
+// provide regional forecast and regional observations on a map
+// this is a two stage process because the data is shared between both
+// and allows for three instances of RegionalForecast to use the same data
+
+/* globals utils, _StationInfo, _RegionalCities */
+
+// a shared global object is used to handle the data for all instances of regional weather
+// eslint-disable-next-line no-unused-vars
+const RegionalForecastData = (() => {
+	let dataPromise;
+	let lastWeatherParameters;
+
+	// update the data by providing weatherParamaters
+	const updateData = (weatherParameters) => {
+		// test for new data comparing weather paramaters
+		if (utils.object.shallowEqual(lastWeatherParameters, weatherParameters)) return dataPromise;
+		// update the promise by calling get data
+		lastWeatherParameters = weatherParameters;
+		dataPromise = getData(weatherParameters);
+		return dataPromise;
+	};
+
+	// return an array of cities each containing an array of 3 weather paramaters 0 = current observation, 1,2 = next forecast periods
+	const getData = async (weatherParameters) => {
+		// map offset
+		const offsetXY = {
+			x: 240,
+			y: 117,
+		};
+		// get user's location in x/y
+		const sourceXY = getXYFromLatitudeLongitude(weatherParameters.latitude, weatherParameters.longitude, offsetXY.x, offsetXY.y, weatherParameters.state);
+
+		// get latitude and longitude limits
+		const minMaxLatLon = getMinMaxLatitudeLongitude(sourceXY.x, sourceXY.y, offsetXY.x, offsetXY.y, weatherParameters.state);
+
+		// get a target distance
+		let targetDistance = 2.5;
+		if (weatherParameters.State === 'HI') targetDistance = 1;
+
+		// make station info into an array
+		const stationInfoArray = Object.keys(_StationInfo).map(key => Object.assign({}, _StationInfo[key], {Name: _StationInfo[key].City, targetDistance}));
+		// combine regional cities with station info for additional stations
+		// stations are intentionally after cities to allow cities priority when drawing the map
+		const combinedCities = [..._RegionalCities, ...stationInfoArray];
+
+		// Determine which cities are within the max/min latitude/longitude.
+		const regionalCities = [];
+		combinedCities.forEach(city => {
+			if (city.Latitude > minMaxLatLon.minLat && city.Latitude < minMaxLatLon.maxLat &&
+				city.Longitude > minMaxLatLon.minLon && city.Longitude < minMaxLatLon.maxLon - 1) {
+			// default to 1 for cities loaded from _RegionalCities, use value calculate above for remaining stations
+				const targetDistance = city.targetDistance || 1;
+				// Only add the city as long as it isn't within set distance degree of any other city already in the array.
+				const okToAddCity = regionalCities.reduce((acc, testCity) => {
+					const distance = utils.calc.distance(city.Longitude, city.Latitude, testCity.Longitude, testCity.Latitude);
+					return acc && distance >= targetDistance;
+				}, true);
+				if (okToAddCity) regionalCities.push(city);
+			}
+		});
+
+		// get regional forecasts and observations (the two are intertwined due to the design of api.weather.gov)
+		const regionalForecastPromises = regionalCities.map(async city => {
+			try {
+			// get the point first, then break down into forecast and observations
+				const point = await utils.weather.getPoint(city.Latitude, city.Longitude);
+
+				// start off the observation task
+				const observationPromise = getRegionalObservation(point, city);
+
+				const forecast = await $.ajax({
+					url: point.properties.forecast,
+					dataType: 'json',
+					crossDomain: true,
+				});
+
+				// get XY on map for city
+				const cityXY = getXYForCity(city, minMaxLatLon.maxLat, minMaxLatLon.minLon, weatherParameters.state);
+
+				// wait for the regional observation if it's not done yet
+				const observation = await observationPromise;
+				// format the observation the same as the forecast
+				const regionalObservation = {
+					daytime: !!observation.icon.match(/\/day\//),
+					temperature: utils.units.celsiusToFahrenheit(observation.temperature.value),
+					name: city.Name,
+					icon: observation.icon,
+					x: cityXY.x,
+					y: cityXY.y,
+				};
+
+				// return a pared-down forecast
+				// 0th object is the current conditions
+				// first object is the next period i.e. if it's daytime then it's the "tonight" forecast
+				// second object is the following period
+				// always skip the first forecast index because it's what's going on right now
+				return [
+					regionalObservation,
+					buildForecast(forecast.properties.periods[1], city, cityXY),
+					buildForecast(forecast.properties.periods[2], city, cityXY),
+				];
+			} catch (e) {
+				console.log(`No regional forecast data for '${city.Name}'`);
+				console.error(e);
+				return false;
+			}
+		});
+
+		// wait for the forecasts
+		const regionalDataAll = await Promise.all(regionalForecastPromises);
+		// filter out any false (unavailable data)
+		const regionalData = regionalDataAll.filter(data => data);
+
+		// return the weather data and offsets
+		return {
+			regionalData,
+			offsetXY,
+			sourceXY,
+		};
+	};
+
+	const buildForecast = (forecast, city, cityXY) => ({
+		daytime: forecast.isDaytime,
+		temperature: forecast.temperature||0,
+		name: city.Name,
+		icon: forecast.icon,
+		x: cityXY.x,
+		y: cityXY.y,
+	});
+
+	const getRegionalObservation = async (point, city) => {
+		try {
+			// get stations
+			const stations = await $.ajax({
+				type: 'GET',
+				url: point.properties.observationStations,
+				dataType: 'json',
+				crossDomain: true,
+			});
+
+			// get the first station
+			const station = stations.features[0].id;
+			// get the observation data
+			const observation = await $.ajax({
+				type: 'GET',
+				url: `${station}/observations/latest`,
+				dataType: 'json',
+				crossDomain: true,
+			});
+			// return the observation
+			return observation.properties;
+		} catch (e) {
+			console.log(`Unable to get regional observations for ${city.Name}`);
+			console.error(e);
+			return false;
+		}
+	};
+
+	// return the data promise so everyone gets the same thing at the same time
+	const getDataPromise = () => dataPromise;
+
+	// utility latitude/pixel conversions
+	const getXYFromLatitudeLongitude = (Latitude, Longitude, OffsetX, OffsetY, state) => {
+		if (state === 'AK') return getXYFromLatitudeLongitudeAK(...arguments);
+		if (state === 'HI') return getXYFromLatitudeLongitudeHI(...arguments);
+		let y = 0;
+		let x = 0;
+		const ImgHeight = 1600;
+		const ImgWidth = 2550;
+
+		y = (50.5 - Latitude) * 55.2;
+		y -= OffsetY; // Centers map.
+		// Do not allow the map to exceed the max/min coordinates.
+		if (y > (ImgHeight - (OffsetY * 2))) {
+			y = ImgHeight - (OffsetY * 2);
+		} else if (y < 0) {
+			y = 0;
+		}
+
+		x = ((-127.5 - Longitude) * 41.775) * -1;
+		x -= OffsetX; // Centers map.
+		// Do not allow the map to exceed the max/min coordinates.
+		if (x > (ImgWidth - (OffsetX * 2))) {
+			x = ImgWidth - (OffsetX * 2);
+		} else if (x < 0) {
+			x = 0;
+		}
+
+		return { x, y };
+	};
+
+	const getXYFromLatitudeLongitudeAK = (Latitude, Longitude, OffsetX, OffsetY) => {
+		let y = 0;
+		let x = 0;
+		const ImgHeight = 1142;
+		const ImgWidth = 1200;
+
+		y = (73.0 - Latitude) * 56;
+		y -= OffsetY; // Centers map.
+		// Do not allow the map to exceed the max/min coordinates.
+		if (y > (ImgHeight - (OffsetY * 2))) {
+			y = ImgHeight - (OffsetY * 2);
+		} else if (y < 0) {
+			y = 0;
+		}
+
+		x = ((-175.0 - Longitude) * 25.0) * -1;
+		x -= OffsetX; // Centers map.
+		// Do not allow the map to exceed the max/min coordinates.
+		if (x > (ImgWidth - (OffsetX * 2))) {
+			x = ImgWidth - (OffsetX * 2);
+		} else if (x < 0) {
+			x = 0;
+		}
+
+		return { x, y };
+	};
+
+	const getXYFromLatitudeLongitudeHI = (Latitude, Longitude, OffsetX, OffsetY) => {
+		let y = 0;
+		let x = 0;
+		const ImgHeight = 571;
+		const ImgWidth = 600;
+
+		y = (25 - Latitude) * 55.2;
+		y -= OffsetY; // Centers map.
+		// Do not allow the map to exceed the max/min coordinates.
+		if (y > (ImgHeight - (OffsetY * 2))) {
+			y = ImgHeight - (OffsetY * 2);
+		} else if (y < 0) {
+			y = 0;
+		}
+
+		x = ((-164.5 - Longitude) * 41.775) * -1;
+		x -= OffsetX; // Centers map.
+		// Do not allow the map to exceed the max/min coordinates.
+		if (x > (ImgWidth - (OffsetX * 2))) {
+			x = ImgWidth - (OffsetX * 2);
+		} else if (x < 0) {
+			x = 0;
+		}
+
+		return { x, y };
+	};
+
+	const getMinMaxLatitudeLongitude = function (X, Y, OffsetX, OffsetY, state) {
+		if (state === 'AK') return getMinMaxLatitudeLongitudeAK(...arguments);
+		if (state === 'HI') return getMinMaxLatitudeLongitudeHI(...arguments);
+		const maxLat = ((Y / 55.2) - 50.5) * -1;
+		const minLat = (((Y + (OffsetY * 2)) / 55.2) - 50.5) * -1;
+		const minLon = (((X * -1) / 41.775) + 127.5) * -1;
+		const maxLon = ((((X + (OffsetX * 2)) * -1) / 41.775) + 127.5) * -1;
+
+		return { minLat, maxLat, minLon, maxLon };
+	};
+
+	const getMinMaxLatitudeLongitudeAK = (X, Y, OffsetX, OffsetY) => {
+		const maxLat = ((Y / 56) - 73.0) * -1;
+		const minLat = (((Y + (OffsetY * 2)) / 56) - 73.0) * -1;
+		const minLon = (((X * -1) / 25) + 175.0) * -1;
+		const maxLon = ((((X + (OffsetX * 2)) * -1) / 25) + 175.0) * -1;
+
+		return { minLat, maxLat, minLon, maxLon };
+	};
+
+	const getMinMaxLatitudeLongitudeHI = (X, Y, OffsetX, OffsetY) => {
+		const maxLat = ((Y / 55.2) - 25) * -1;
+		const minLat = (((Y + (OffsetY * 2)) / 55.2) - 25) * -1;
+		const minLon = (((X * -1) / 41.775) + 164.5) * -1;
+		const maxLon = ((((X + (OffsetX * 2)) * -1) / 41.775) + 164.5) * -1;
+
+		return { minLat, maxLat, minLon, maxLon };
+	};
+
+	const getXYForCity = (City, MaxLatitude, MinLongitude, state) => {
+		if (state === 'AK') getXYForCityAK(...arguments);
+		if (state === 'HI') getXYForCityHI(...arguments);
+		let x = (City.Longitude - MinLongitude) * 57;
+		let y = (MaxLatitude - City.Latitude) * 70;
+
+		if (y < 30) y = 30;
+		if (y > 282) y = 282;
+
+		if (x < 40) x = 40;
+		if (x > 580) x = 580;
+
+		return { x, y };
+	};
+
+	const getXYForCityAK = (City, MaxLatitude, MinLongitude) => {
+		let x = (City.Longitude - MinLongitude) * 37;
+		let y = (MaxLatitude - City.Latitude) * 70;
+
+		if (y < 30) y = 30;
+		if (y > 282) y = 282;
+
+		if (x < 40) x = 40;
+		if (x > 580) x = 580;
+		return { x, y };
+	};
+
+	const getXYForCityHI = (City, MaxLatitude, MinLongitude) => {
+		let x = (City.Longitude - MinLongitude) * 57;
+		let y = (MaxLatitude - City.Latitude) * 70;
+
+		if (y < 30) y = 30;
+		if (y > 282) y = 282;
+
+		if (x < 40) x = 40;
+		if (x > 580) x = 580;
+
+		return { x, y };
+	};
+
+	return {
+		updateData,
+		getDataPromise,
+	};
+})();