Allow dynamic selection of weather provider

routes/weatherProviders/OWM.ts

@@ -0,0 +1,92 @@
+import { GeoCoordinates, WateringData, WeatherData, WeatherProvider } from "../../types";
+import { httpJSONRequest } from "../weather";
+
+async function getOWMWateringData( coordinates: GeoCoordinates ): Promise< WateringData > {
+	const OWM_API_KEY = process.env.OWM_API_KEY,
+	  forecastUrl = "http://api.openweathermap.org/data/2.5/forecast?appid=" + OWM_API_KEY + "&units=imperial&lat=" + coordinates[ 0 ] + "&lon=" + coordinates[ 1 ];
+
+	// Perform the HTTP request to retrieve the weather data
+	let forecast;
+	try {
+		forecast = await httpJSONRequest( forecastUrl );
+	} catch (err) {
+		// Indicate watering data could not be retrieved if an API error occurs.
+		return undefined;
+	}
+
+	// Indicate watering data could not be retrieved if the forecast data is incomplete.
+	if ( !forecast || !forecast.list ) {
+		return undefined;
+	}
+
+	let totalTemp = 0,
+	  totalHumidity = 0,
+	  totalPrecip = 0;
+
+	const periods = Math.min(forecast.list.length, 10);
+	for ( let index = 0; index < periods; index++ ) {
+		totalTemp += parseFloat( forecast.list[ index ].main.temp );
+		totalHumidity += parseInt( forecast.list[ index ].main.humidity );
+		totalPrecip += ( forecast.list[ index ].rain ? parseFloat( forecast.list[ index ].rain[ "3h" ] || 0 ) : 0 );
+	}
+
+	return {
+		temp: totalTemp / periods,
+		humidity: totalHumidity / periods,
+		precip: totalPrecip / 25.4,
+		raining: ( forecast.list[ 0 ].rain ? ( parseFloat( forecast.list[ 0 ].rain[ "3h" ] || 0 ) > 0 ) : false )
+	};
+}
+
+async function getOWMWeatherData( coordinates: GeoCoordinates ): Promise< WeatherData > {
+	const OWM_API_KEY = process.env.OWM_API_KEY,
+	  currentUrl = "http://api.openweathermap.org/data/2.5/weather?appid=" + OWM_API_KEY + "&units=imperial&lat=" + coordinates[ 0 ] + "&lon=" + coordinates[ 1 ],
+	  forecastDailyUrl = "http://api.openweathermap.org/data/2.5/forecast/daily?appid=" + OWM_API_KEY + "&units=imperial&lat=" + coordinates[ 0 ] + "&lon=" + coordinates[ 1 ];
+
+	let current, forecast;
+	try {
+		current = await httpJSONRequest( currentUrl );
+		forecast = await httpJSONRequest( forecastDailyUrl );
+	} catch (err) {
+		// Indicate watering data could not be retrieved if an API error occurs.
+		return undefined;
+	}
+
+	// Indicate watering data could not be retrieved if the forecast data is incomplete.
+	if ( !current || !current.main || !current.wind || !current.weather || !forecast || !forecast.list ) {
+		return undefined;
+	}
+
+	const weather: WeatherData = {
+		temp:  parseInt( current.main.temp ),
+		humidity: parseInt( current.main.humidity ),
+		wind: parseInt( current.wind.speed ),
+		description: current.weather[0].description,
+		icon: current.weather[0].icon,
+
+		region: forecast.city.country,
+		city: forecast.city.name,
+		minTemp: parseInt( forecast.list[ 0 ].temp.min ),
+		maxTemp: parseInt( forecast.list[ 0 ].temp.max ),
+		precip: ( forecast.list[ 0 ].rain ? parseFloat( forecast.list[ 0 ].rain || 0 ) : 0 ) / 25.4,
+		forecast: []
+	};
+
+	for ( let index = 0; index < forecast.list.length; index++ ) {
+		weather.forecast.push( {
+			temp_min: parseInt( forecast.list[ index ].temp.min ),
+			temp_max: parseInt( forecast.list[ index ].temp.max ),
+			date: parseInt( forecast.list[ index ].dt ),
+			icon: forecast.list[ index ].weather[ 0 ].icon,
+			description: forecast.list[ index ].weather[ 0 ].description
+		} );
+	}
+
+	return weather;
+}
+
+const OWMWeatherProvider: WeatherProvider = {
+	getWateringData: getOWMWateringData,
+	getWeatherData: getOWMWeatherData
+};
+export default OWMWeatherProvider;