weatherobject.js

/* global Class */

/* Magic Mirror
 * Module: Weather
 *
 * By Michael Teeuw http://michaelteeuw.nl
 * MIT Licensed.
 *
 * This class is the blueprint for a day which includes weather information.
 */

// Currently this is focused on the information which is necessary for the current weather.
// As soon as we start implementing the forecast, mode properties will be added.

class WeatherObject {
	constructor(units, tempUnits, windUnits) {

		this.units = units;
		this.tempUnits = tempUnits;
		this.windUnits = windUnits;
		this.date = null;
		this.windSpeed = null;
		this.windDirection = null;
		this.sunrise = null;
		this.sunset = null;
		this.temperature = null;
		this.minTemperature = null;
		this.maxTemperature = null;
		this.weatherType = null;
		this.humidity = null;
		this.rain = null;
		this.snow = null;
		this.precipitation = null;
		this.feelsLikeTemp = null;

	}

	cardinalWindDirection() {
		if (this.windDirection > 11.25 && this.windDirection <= 33.75){
			return "NNE";
		} else if (this.windDirection > 33.75 && this.windDirection <= 56.25) {
			return "NE";
		} else if (this.windDirection > 56.25 && this.windDirection <= 78.75) {
			return "ENE";
		} else if (this.windDirection > 78.75 && this.windDirection <= 101.25) {
			return "E";
		} else if (this.windDirection > 101.25 && this.windDirection <= 123.75) {
			return "ESE";
		} else if (this.windDirection > 123.75 && this.windDirection <= 146.25) {
			return "SE";
		} else if (this.windDirection > 146.25 && this.windDirection <= 168.75) {
			return "SSE";
		} else if (this.windDirection > 168.75 && this.windDirection <= 191.25) {
			return "S";
		} else if (this.windDirection > 191.25 && this.windDirection <= 213.75) {
			return "SSW";
		} else if (this.windDirection > 213.75 && this.windDirection <= 236.25) {
			return "SW";
		} else if (this.windDirection > 236.25 && this.windDirection <= 258.75) {
			return "WSW";
		} else if (this.windDirection > 258.75 && this.windDirection <= 281.25) {
			return "W";
		} else if (this.windDirection > 281.25 && this.windDirection <= 303.75) {
			return "WNW";
		} else if (this.windDirection > 303.75 && this.windDirection <= 326.25) {
			return "NW";
		} else if (this.windDirection > 326.25 && this.windDirection <= 348.75) {
			return "NNW";
		} else {
			return "N";
		}
	}

	beaufortWindSpeed() {
		const windInKmh = (this.windUnits === "imperial") ? this.windSpeed * 1.609344 : this.windSpeed * 60 * 60 / 1000;
		const speeds = [1, 5, 11, 19, 28, 38, 49, 61, 74, 88, 102, 117, 1000];
		for (const [index, speed] of speeds.entries()) {
			if (speed > windInKmh) {
				return index;
			}
		}
		return 12;
	}

	nextSunAction() {
		return moment().isBetween(this.sunrise, this.sunset) ? "sunset" : "sunrise";
	}

	feelsLike() {
	  if (this.feelsLikeTemp) {
		  return this.feelsLikeTemp;
		}
		const windInMph = (this.windUnits === "imperial") ? this.windSpeed : this.windSpeed * 2.23694;
		const tempInF = this.tempUnits === "imperial" ? this.temperature : this.temperature * 9 / 5 + 32;
		let feelsLike = tempInF;

		if (windInMph > 3 && tempInF < 50) {
			feelsLike = Math.round(35.74 + 0.6215 * tempInF - 35.75 * Math.pow(windInMph, 0.16) + 0.4275 * tempInF * Math.pow(windInMph, 0.16));
		} else if (tempInF > 80 && this.humidity > 40) {
			feelsLike = -42.379 + 2.04901523 * tempInF + 10.14333127 * this.humidity
				- 0.22475541 * tempInF * this.humidity - 6.83783 * Math.pow(10, -3) * tempInF * tempInF
				- 5.481717 * Math.pow(10, -2) * this.humidity * this.humidity
				+ 1.22874 * Math.pow(10, -3) * tempInF * tempInF * this.humidity
				+ 8.5282 * Math.pow(10, -4) * tempInF * this.humidity * this.humidity
				- 1.99 * Math.pow(10, -6) * tempInF * tempInF * this.humidity * this.humidity;
		}

		return this.tempUnits === "imperial" ? feelsLike : (feelsLike - 32) * 5 / 9;
	}
}