/* Magic Mirror
 * Module: MMM-covid19
 *
 * Author: Sebastian Mark
 * CC-BY-SA (https://creativecommons.org/licenses/by-sa/4.0/deed.de)
 * for civil use only
*/

Module.register("MMM-covid19", {
	defaults: {
		region: "Bonn",
		updateInterval: 3 * 60 * 60 * 1000,    // 4h
		fadeSpeed: 0,
		showHeader: true,
		appendLocationNameToHeader: true,
		data_url: "https://rp-online.de/app/interaktiv_server/data/rki_nrw_mapped.json.php",
	},
	cases: {
		new7: "N/A",
		new7_100k: "N/A",
		active: "N/A",
		total: "N/A",
		death: "N/A",
		cured: "N/A",
		trend: "N/A",
		ts: "N/A",
	},

	start: function() {
		// init module and set update intervall
		var self = this;
		Log.log(this.name + ' is started!');
		self.update_data();
		setInterval(function() {
			self.update_data();
			self.updateDom(this.config.fadeSpeed);
		}, this.config.updateInterval);
	},

	getHeader: function() {
		// set module header
		if (this.config.showHeader) {
			this.data.header = "COVID-19 Daten";
			if (this.config.appendLocationNameToHeader) {
				this.data.header += " für " + this.config.region;
			}
		}
		return this.data.header;
	},

	getStyles: function () {
		// load custom css for module
		return ["MMM-covid19.css"];
	},

	getTemplate: function () {
		// load template for layout
		return 'MMM-covid19.njk';
	},

	getTemplateData: function () {
		// pass variables to template
		return { cases: this.cases }
	},

	update_data: function() {
		// get and parse json data from source
		var xmlHttp = new XMLHttpRequest();
		xmlHttp.open( "GET", this.config.data_url, false ); // false for synchronous request
		xmlHttp.send( null );
		data = JSON.parse(xmlHttp.responseText);

		// extract data
		this.cases.new7 = data[this.config.region]["last_7"];
		this.cases.new7_100k = data[this.config.region]["last_7_100000"];
		this.cases.active = data[this.config.region]["active"];
		this.cases.total = data[this.config.region]["cases"];
		this.cases.death = data[this.config.region]["tot"];
		this.cases.cured = data[this.config.region]["gesund"];
		this.cases.ts = data[this.config.region]["date"];

		// determine trend:
		// calc this and last weeks cases and substract
		// result is the difference of new cases between this and last week
		currentToLastWeekDiff = (data[this.config.region]["last_7"] * 2) - data[this.config.region]["last_14"]
		if (currentToLastWeekDiff > 10) {
			    this.cases.trend = "bad";
		} else if (currentToLastWeekDiff > 0) {
			    this.cases.trend = "warn";
		} else if (currentToLastWeekDiff == 0) {
			    this.cases.trend = "even";
		} else if (currentToLastWeekDiff < 0) {
			    this.cases.trend = "good";
		}
	},
});