A Scriptable Widget That Displays Deutsche Bahn Connections and Their Delay

db-connections.js

/*
 * This script queries the API documented at https://docs.marudor.de
 * to retrieve the next Deutsche Bahn connections between two given
 * stations. Only direct connections are supported.
 */

// ====== Configuration ======
/* Eva Number of the stations
 * Find yours here https://download-data.deutschebahn.com/static/datasets/haltestellen/D_Bahnhof_2020_alle.CSV
 */
const START_STATION = "";
const DESTINATION_STATION = "";
// How many connections the widget will display
const CONNECTIONS_TO_SHOW = 3;
// Toggle to only show regional trains
const ONLY_REGIONAL = true;
  
async function createWidget() {
  let listwidget = new ListWidget();
 
  let connections = await getConnections();
  if (connections != null) {
    displayStations(listwidget, connections)
    displayConnections(listwidget, connections);
  }
  
  return listwidget;
}

let widget = await createWidget();

if (config.runsInWidget) {
  Script.setWidget(widget);
} else {
  widget.presentMedium();
}
Script.complete();

// Retrieves the connections object based on the given configuration
async function getConnections() {
  let url = "https://marudor.de/api/hafas/v3/tripSearch";
  let currentTime = new Date();
  let body = {
      "start": START_STATION,
      "destination": DESTINATION_STATION,
      "time": currentTime.toISOString(),
      "transferTime": 0,
      "maxChanges": 0,
      "searchForDeparture": true,
      "onlyRegional": ONLY_REGIONAL
    };
  let req = new Request(url);
  req.body = JSON.stringify(body);
  req.headers = {"Content-type": "application/json;charset=UTF-8"}
  req.method = "POST";
  log(req.body)
  let responseBody = await req.loadJSON();
  if(req.response.statusCode != 200) {
    log("Received status code: " + req.response.statusCode)  
    log("Body: " + JSON.stringify(responseBody))
    return null
  }
  return responseBody
}

function displayStations(stack, connections) {
  let firstRoute = connections.routes[0]
  let departureStation = firstRoute.segments[0].segmentStart.title
  let arrivalStation = firstRoute.segments[0].segmentDestination.title
  
  let stationsText = stack.addText("🚆 " + departureStation + " --> " + arrivalStation)
  stationsText.font = Font.boldSystemFont(16)
  stationsText.centerAlignText();
}

// Renders the connections
function displayConnections(stack, connections) {
  let routes = connections.routes
  log(JSON.stringify(routes))
  for (let i in routes) {
    if (i >= CONNECTIONS_TO_SHOW) {
      break;
    }
    let route = routes[i]
    let departurePlatform = route.departure.platform
    let departureTime = new Date(route.departure.time)
    let arrivalTime = new Date(route.arrival.time)
    let departureDelay = route.departure.delay
    let arrivalDelay = route.arrival.delay
    let trainName = route.segments[0].train.name
  
    // Skip connections that are in the past
    if (departureTime < new Date()) {
      continue;
    }
    
    let nameText = stack.addText(trainName + " (🚉" + departurePlatform + ")")
    nameText.font = Font.semiboldSystemFont(16)
    
    let timeText = stack.addText(
      departureTime.toLocaleTimeString() + " (+" + departureDelay + ")" + " --> " +
      arrivalTime.toLocaleTimeString() + " (+" + arrivalDelay + ")")
    timeText.font = Font.regularSystemFont(14)
    if (departureDelay <= 3) {
      timeText.textColor = Color.green()
    } else {
      timeText.textColor = Color.red()
    }
  }
}