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<h1>_{MsgOBU}

<section>
  <h2>Blub
  <strong>Token:</strong> <span id="token">
<section>
  <h2>Status
  <p id="status">_{MsgNone}
  <p id>_{MsgError}: <span id="error">
<section>
  <h2>_{MsgLive}
  <p><strong>Position: </strong><span id="lat"></span>, <span id="long"></span>
  <p><strong>Accuracy: </strong><span id="acc">
<section>
  <h2>_{MsgEstimated}
  <p><strong>_{MsgDelay}</strong>: <span id="delay">
  <p><strong>_{MsgSequence}</strong>: <span id="sequence">


<script>
  var token = null;

  let euclid = (a,b) => {
    let x = a[0]-b[0];
    let y = a[1]-b[1];
    return x*x+y*y;
  }

  let minimalDist = (point, list, proj, norm) => {
    return list.reduce (
      (min, x) => {
        let dist = norm(point, proj(x));
        return dist < min[0] ? [dist,x] : min
      },
      [norm(point, proj(list[0])), list[0]]
    )[1]
  }

  let counter = 0;
  let ws;
  let id;

  function setStatus(msg) {
    document.getElementById("status").innerText = msg
  }

  async function geoError(error) {
    setStatus("error");
    alert(`_{MsgPermissionFailed}: \n${error.message}`);
    console.error(error);
    main();
  }

  async function wsError(error) {
    // alert(`_{MsgWebsocketError}: \n${error.message === undefined ? error.reason : error.message}`);
    console.log(error);
    navigator.geolocation.clearWatch(id);
  }

  async function wsClose(error) {
    console.log(error);
    document.getElementById("error").innerText = `websocket closed (reason: ${error.reason}). reconnecting …`;
    navigator.geolocation.clearWatch(id);
    setTimeout(openWebsocket, 1000);
  }

  function wsMsg(msg) {
    let json = JSON.parse(msg.data);
    console.log(json);
    document.getElementById("delay").innerText =
      `${json.delay}s (${Math.floor(json.delay / 60)}min)`;
    document.getElementById("sequence").innerText = json.sequence;
  }


  function initGeopos() {
    document.getElementById("error").innerText = "";
    id = navigator.geolocation.watchPosition(
      geoPing,
      geoError,
      {enableHighAccuracy: true}
    );
  }


  function openWebsocket () {
    ws = new WebSocket((location.protocol == "http:" ? "ws" : "wss") + "://" + location.host + "/api/tracker/ping/ws");
    ws.onerror = wsError;
    ws.onclose = wsClose;
    ws.onmessage = wsMsg;
    ws.onopen = (event) => {
      setStatus("connected");
    };
  }

  async function geoPing(geoloc) {
    console.log("got position update " + counter);
    document.getElementById("lat").innerText = geoloc.coords.latitude;
    document.getElementById("long").innerText = geoloc.coords.longitude;
    document.getElementById("acc").innerText = geoloc.coords.accuracy;

    if (ws !== undefined && ws.readyState == 1) {
        ws.send(JSON.stringify({
            token: token,
            geopos: [ geoloc.coords.latitude, geoloc.coords.longitude ],
            timestamp: (new Date()).toISOString()
        }));
        counter += 1;
        setStatus(`sent ${counter} pings`);
    } else {
        setStatus(`websocket readystate ${ws.readyState}`);
    }
  }


  async function main() {
    initGeopos();

    token = await (await fetch("/api/tracker/register/", {
      method: "POST",
      body: JSON.stringify({agent: "tracktrain-website"}),
      headers: {"Content-Type": "application/json"}
    })).json();

    if (token.error) {
      alert("could not obtain token: \n" + token.msg);
      setStatus("_{MsgTokenFailed}");
    } else {
      console.log("got token");

      document.getElementById("token").innerText = token;

      openWebsocket();
    }
  }

  main()