macker/server/index.html

<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8"><meta name="viewport" content="width=device-width,initial-scale=1">
<title>Macker · Work car</title>
<link rel="stylesheet" href="https://unpkg.com/leaflet@1.9.4/dist/leaflet.css">
<style>
*{box-sizing:border-box}body{margin:0;background:#f3f5f2;color:#182d26;font:16px system-ui,sans-serif}header{padding:24px 5vw;display:flex;justify-content:space-between;align-items:center}h1{font-size:24px;margin:0}header p{margin:4px 0;color:#607269}main{margin:0 5vw 28px}.stats{display:flex;gap:16px;margin-bottom:20px}.card{background:white;border:1px solid #dce4dd;border-radius:12px;padding:20px;flex:1}.label{font-size:12px;text-transform:uppercase;letter-spacing:.1em;color:#607269}.value{display:block;font-size:32px;margin:8px 0}small{color:#607269}#address{font-size:20px;overflow-wrap:anywhere}.stats{flex-wrap:wrap}.card{min-width:220px}#map{height:65vh;min-height:320px;border-radius:14px;border:1px solid #cbd8cd}button{background:#1c593f;color:white;border:0;border-radius:8px;padding:12px;cursor:pointer}#status{margin:12px 0;min-height:24px}@media(max-width:540px){.stats{flex-direction:column;gap:10px}.card{padding:14px}.value{font-size:26px}header{gap:12px}#address{font-size:20px;overflow-wrap:anywhere}.stats{flex-wrap:wrap}.card{min-width:220px}#map{height:50vh}}
</style>
</head>
<body>
<header><div><h1>Macker</h1><p>Work car · Live location</p></div><button id="follow" type="button">Follow car: on</button></header>
<main><div class="stats"><section class="card"><span class="label">Current speed</span><strong class="value" id="speed">—</strong><small id="metric">Waiting for GPS</small></section><section class="card"><span class="label">Last update</span><strong class="value" id="age">—</strong><small id="time">No location received yet</small></section><section class="card"><span class="label">Nearby address</span><strong class="value" id="address">—</strong><small id="address-distance">Waiting for GPS</small><br><small id="address-source"></small></section></div><p id="status" role="status">Waiting for the car’s first GPS fix…</p><p id="uncertainty"><small>GPS uncertainty unavailable</small></p><p id="imagery-info" role="status"><small>Street map · OpenStreetMap</small></p><div id="map" aria-label="Street or aerial car location map with GPS uncertainty circle"></div></main>
<script src="https://unpkg.com/leaflet@1.9.4/dist/leaflet.js"></script>
<script>
const el=id=>document.getElementById(id);
let map, marker, uncertaintyCircle, latest, follow=true, failed=false;
// USGS exports Web Mercator images; its ImageServer is not an XYZ tile cache.
// Match each Leaflet tile's projected bounds explicitly to keep fixes aligned.
function aerialTileURL(coords){
 const halfWorld=20037508.342789244;
 const span=2*halfWorld/2**coords.z;
 const west=-halfWorld+coords.x*span,north=halfWorld-coords.y*span;
 const query=new URLSearchParams({
  f:'image',bbox:[west,north-span,west+span,north].join(','),
  bboxSR:'3857',imageSR:'3857',size:'256,256',format:'jpg',
  interpolation:'RSP_BilinearInterpolation',
  renderingRule:JSON.stringify({rasterFunction:'NaturalColor'})
 });
 return `https://imagery.nationalmap.gov/arcgis/rest/services/USGSNAIPImagery/ImageServer/exportImage?${query}`;
}
if(window.L){
 map=L.map('map').setView([31.4,-89.7],7);
 const street=L.tileLayer('https://tile.openstreetmap.org/{z}/{x}/{y}.png',{
  maxZoom:19,attribution:'&copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors'
 }).addTo(map);
 const AerialLayer=L.TileLayer.extend({getTileUrl:aerialTileURL});
 const aerial=new AerialLayer('',{
  maxZoom:19,bounds:[[30.1,-91.7],[35.1,-88.0]],
  updateWhenIdle:true,keepBuffer:1,
  attribution:'Aerial imagery: USDA NAIP / <a href="https://www.usgs.gov/programs/national-geospatial-program/national-map">USGS, The National Map</a>'
 });
 L.control.layers({Street:street,Aerial:aerial},null,{collapsed:false}).addTo(map);
 map.on('layeradd',event=>{
  if(event.layer===aerial)el('imagery-info').textContent='Loading aerial imagery · USDA NAIP / USGS · Photography dates vary; imagery is not live';
  else if(event.layer===street)el('imagery-info').textContent='Street map · OpenStreetMap';
 });
 aerial.on('load',()=>{
  if(map.hasLayer(aerial))el('imagery-info').textContent='Aerial imagery · USDA NAIP / USGS · Photography dates vary; imagery is not live';
 });
 aerial.on('tileerror',()=>{
  if(!map.hasLayer(aerial))return;
  map.removeLayer(aerial);
  street.addTo(map);
  el('imagery-info').textContent='Aerial imagery could not load. Showing street map; select Aerial to retry.';
 });
}
el('follow').onclick=()=>{follow=!follow;el('follow').textContent=`Follow car: ${follow?'on':'off'}`;if(follow&&marker)map.panTo(marker.getLatLng());};
// gpsd axis errors are already in metres. Enclose their horizontal error box.
// Zero also represents an omitted estimate in the client's gpsd dependency.
function uncertaintyRadius(point){
 const {LatErr,LongErr}=point;
 if(!Number.isFinite(LatErr)||!Number.isFinite(LongErr)||LatErr<=0||LongErr<=0)return null;
 const radius=Math.hypot(LatErr,LongErr);
 return Number.isFinite(radius)?radius:null;
}
function updateUncertainty(point,pos){
 const radius=uncertaintyRadius(point);
 el('uncertainty').textContent=radius===null?'GPS uncertainty unavailable':`Estimated GPS uncertainty: ${radius.toFixed(1)} m radius · shaded circle`;
 if(radius===null){
  if(uncertaintyCircle){map.removeLayer(uncertaintyCircle);uncertaintyCircle=null;}
  return;
 }
 if(!uncertaintyCircle){
  uncertaintyCircle=L.circle(pos,{radius,color:'#287a57',weight:2,fillColor:'#409b73',fillOpacity:0.16,interactive:false}).addTo(map);
 }else{uncertaintyCircle.setLatLng(pos).setRadius(radius);}
}
function renderAddress(nearby,stale){
 const address=nearby?.address;
 el('address').textContent=address?.label||'—';
 el('address-source').textContent=address?.attribution||'';
 if(address){
  const m=address.distance_meters;
  const distance=m<1000?`${Math.round(m)} m`:`${(m/1000).toFixed(1)} km`;
  el('address-distance').textContent=`Approximately ${distance} away · straight-line${stale?' · last known fix':''}`;
 }else{
  const messages={disabled:'Address lookup is not configured',pending:'Looking up nearby address…',unavailable:'No nearby mapped address available'};
  el('address-distance').textContent=messages[nearby?.status]||'Address unavailable';
 }
}
function render(){
 if(!latest){el('status').textContent=failed?'Cannot reach server. Retrying…':'Waiting for the car’s first GPS fix…';return;}
 const seconds=Math.max(0,Math.floor((Date.now()-Date.parse(latest.updated_at))/1000));
 const stale=seconds>30,p=latest.point;
 renderAddress(latest.nearby,stale||failed);
 el('age').textContent=seconds<60?`${seconds} s ago`:seconds<3600?`${Math.floor(seconds/60)} min ago`:`${Math.floor(seconds/3600)} h ago`;
 el('time').textContent=new Date(latest.updated_at).toLocaleString();
 el('speed').textContent=stale||p.Speed==null?'—':`${(p.Speed*2.236936).toFixed(1)} mph`;
 el('metric').textContent=stale?'Last fix is stale':p.Speed==null?'Speed unavailable':`${(p.Speed*3.6).toFixed(1)} km/h`;
 el('status').textContent=failed?'Connection lost · showing last known location':stale?'No recent GPS fix · showing last known location':`GPS active · ${p.Lat.toFixed(5)}, ${p.Long.toFixed(5)}`;
 if(!map)el('status').textContent+=' · Map failed to load; reload to retry';
}
async function poll(){try{const res=await fetch('/api/location',{cache:'no-store',signal:AbortSignal.timeout(8000)});if(!res.ok)throw Error(res.status);latest=await res.json();failed=false;if(latest&&map){const pos=[latest.point.Lat,latest.point.Long];updateUncertainty(latest.point,pos);if(!marker){marker=L.marker(pos).addTo(map);map.setView(pos,15);}else{marker.setLatLng(pos);if(follow)map.panTo(pos);}}}catch(e){failed=true;}render();setTimeout(poll,2000);}
setInterval(render,1000);poll();
</script>
</body></html>