125 lines
4.5 KiB
JavaScript
125 lines
4.5 KiB
JavaScript
// current weather conditions display
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import { distance as calcDistance, directionToNSEW } from './utils/calc.mjs';
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import { json } from './utils/fetch.mjs';
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import STATUS from './status.mjs';
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import { locationCleanup } from './utils/string.mjs';
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import { celsiusToFahrenheit, kphToMph } from './utils/units.mjs';
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import WeatherDisplay from './weatherdisplay.mjs';
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import { registerDisplay } from './navigation.mjs';
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class LatestObservations extends WeatherDisplay {
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constructor(navId, elemId) {
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super(navId, elemId, 'Latest Observations', true);
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// constants
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this.MaximumRegionalStations = 7;
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}
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async getData(_weatherParameters) {
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if (!super.getData(_weatherParameters)) return;
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const weatherParameters = _weatherParameters ?? this.weatherParameters;
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// calculate distance to each station
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const stationsByDistance = Object.keys(StationInfo).map((key) => {
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const station = StationInfo[key];
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const distance = calcDistance(station.lat, station.lon, weatherParameters.latitude, weatherParameters.longitude);
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return { ...station, distance };
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});
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// sort the stations by distance
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const sortedStations = stationsByDistance.sort((a, b) => a.distance - b.distance);
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// try up to 30 regional stations
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const regionalStations = sortedStations.slice(0, 30);
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// get data for regional stations
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const allConditions = await Promise.all(regionalStations.map(async (station) => {
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try {
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const data = await json(`https://api.weather.gov/stations/${station.id}/observations/latest`);
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// test for temperature, weather and wind values present
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if (data.properties.temperature.value === null
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|| data.properties.textDescription === ''
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|| data.properties.windSpeed.value === null) return false;
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// format the return values
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return {
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...data.properties,
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StationId: station.id,
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city: station.city,
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};
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} catch (e) {
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console.log(`Unable to get latest observations for ${station.id}`);
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return false;
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}
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}));
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// remove and stations that did not return data
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const actualConditions = allConditions.filter((condition) => condition);
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// cut down to the maximum of 7
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this.data = actualConditions.slice(0, this.MaximumRegionalStations);
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// test for at least one station
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if (this.data.length < 1) {
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this.setStatus(STATUS.noData);
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return;
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}
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this.setStatus(STATUS.loaded);
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}
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async drawCanvas() {
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super.drawCanvas();
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const conditions = this.data;
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// sort array by station name
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const sortedConditions = conditions.sort((a, b) => ((a.Name < b.Name) ? -1 : 1));
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this.elem.querySelector('.column-headers .temp.english').classList.add('show');
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this.elem.querySelector('.column-headers .temp.metric').classList.remove('show');
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const lines = sortedConditions.map((condition) => {
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const windDirection = directionToNSEW(condition.windDirection.value);
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const Temperature = Math.round(celsiusToFahrenheit(condition.temperature.value));
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const WindSpeed = Math.round(kphToMph(condition.windSpeed.value));
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const fill = {};
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fill.location = locationCleanup(condition.city).substr(0, 14);
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fill.temp = Temperature;
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fill.weather = LatestObservations.shortenCurrentConditions(condition.textDescription).substr(0, 9);
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if (WindSpeed > 0) {
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fill.wind = windDirection + (Array(6 - windDirection.length - WindSpeed.toString().length).join(' ')) + WindSpeed.toString();
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} else if (WindSpeed === 'NA') {
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fill.wind = 'NA';
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} else {
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fill.wind = 'Calm';
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}
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return this.fillTemplate('observation-row', fill);
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});
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const linesContainer = this.elem.querySelector('.observation-lines');
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linesContainer.innerHTML = '';
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linesContainer.append(...lines);
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this.finishDraw();
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}
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static shortenCurrentConditions(_condition) {
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let condition = _condition;
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condition = condition.replace(/Light/, 'L');
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condition = condition.replace(/Heavy/, 'H');
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condition = condition.replace(/Partly/, 'P');
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condition = condition.replace(/Mostly/, 'M');
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condition = condition.replace(/Few/, 'F');
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condition = condition.replace(/Thunderstorm/, 'T\'storm');
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condition = condition.replace(/ in /, '');
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condition = condition.replace(/Vicinity/, '');
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condition = condition.replace(/ and /, ' ');
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condition = condition.replace(/Freezing Rain/, 'Frz Rn');
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condition = condition.replace(/Freezing/, 'Frz');
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condition = condition.replace(/Unknown Precip/, '');
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condition = condition.replace(/L Snow Fog/, 'L Snw/Fog');
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condition = condition.replace(/ with /, '/');
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return condition;
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}
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}
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// register display
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registerDisplay(new LatestObservations(1, 'latest-observations'));
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