/* 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",
		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!');
		setInterval(function() {
			self.updateDom(this.config.fadeSpeed);
		}, this.config.updateInterval);
	},

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

	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;
	},

	getDom: function() {
		// get/update covid data
		this.update_data();

		// create layout and output
		var wrapper = document.createElement("div");
		var new7_wrapper = document.createElement("span");
		var active_wrapper = document.createElement("span");
		var total_wrapper = document.createElement("span");
		var death_wrapper = document.createElement("span");
		var cured_wrapper = document.createElement("span");
		var ts_wrapper = document.createElement("div");


		wrapper.className = "covid19";

		new7_wrapper.className = "new7";
		new7_wrapper.innerHTML = "Neu: " + this.cases.new7 + " " + this.cases.trend + "<br>";
		wrapper.appendChild(new7_wrapper);

		active_wrapper.className = "active";
		active_wrapper.innerHTML = "Aktiv: " + this.cases.active + "<br>";
		wrapper.appendChild(active_wrapper);

		total_wrapper.className = "total";
		total_wrapper.innerHTML = "Gesamt: " + this.cases.total + "<br>";
		wrapper.appendChild(total_wrapper);

		death_wrapper.className = "death";
		death_wrapper.innerHTML = "Tote: " + this.cases.death + "<br>";
		wrapper.appendChild(death_wrapper);

		cured_wrapper.className = "cured";
		cured_wrapper.innerHTML = "Genesen: " + this.cases.cured + "<br>";
		wrapper.appendChild(cured_wrapper);

		ts_wrapper.className = "ts";
		ts_wrapper.innerHTML = this.cases.ts;
		wrapper.appendChild(ts_wrapper);

		return wrapper;
	},

	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.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
		// +10: red (arrow up)
		//  +0: orange (arrow up)
		//   0: normal (arrow right)
		//  -0: green (arrow down)
		currentToLastWeekDiff =  (data[this.config.region]["last_7"] * 2) - data[this.config.region]["last_14"]
		if (currentToLastWeekDiff < 0) {
			    this.cases.trend = "<span class=good>&searr;</span>";
		} else if (currentToLastWeekDiff == 0) {
			    this.cases.trend = "&#rarr;";
		} else if (currentToLastWeekDiff > 10) {
			    this.cases.trend = "<span class=bad>&nearr;</span>";
		} else if (currentToLastWeekDiff > 0) {
			    this.cases.trend = "<span class=warn>&nearr;</span>";
		}
	},
});