const datasets = [{ name: 'Geostationary', url: '_space-track-geo.txt' }];

const timeLog = document.getElementById('time-log');

Promise.all(datasets.map(d => fetch(d.url).then(r => r.text())))
  .then(data => {

    const satNames = new Set();

    const sats = [].concat(...data.map((groupData, idx) => {
      const group = datasets[idx].name;
      const tles = groupData.split('\n0').map(tle => tle.split('\n'));

      return tles.map(([name, ...tle]) => ({
        satrec: satellite.twoline2satrec(...tle),
        name: name.split(' ').slice(1).join(' '),
        group
      }));
    }))
      .filter(({ name }) => {
        if (satNames.has(name)) return false; // remove duplicates
        satNames.add(name);
        return true;
      });

    SatellitesView()
      (document.getElementById('chart'))
      .satData(sats)
      .onTimeChange(t => timeLog.innerText = t.toString());
  });