feat(geocode): fully offline reverse geocode via local Pi API

- Remove all Nominatim/external calls from frontend
- Add /api/geocode?lat=&lon= route using reverse_geocoder (20MB offline KD-tree)
- JS hits /api/geocode only — works with no internet at all
- Falls back to raw coords if Pi route fails
- Add reverse_geocoder to requirements.txt

Co-authored-by: Copilot <[email protected]>

app.py

@@ -89,6 +89,23 @@ def trip_route(trip_id):
         return jsonify(error=f"Trip not found: {trip_id}"), 404
     return jsonify(trip)
 
+@app.route('/api/geocode')
+def geocode_route():
+    try:
+        lat = float(request.args['lat'])
+        lon = float(request.args['lon'])
+    except (KeyError, ValueError):
+        return jsonify(error="lat and lon required"), 400
+    import reverse_geocoder as rg
+    results = rg.search([(lat, lon)], mode=1, verbose=False)
+    if results:
+        r = results[0]
+        parts = [r.get('name', ''), r.get('admin1', '')]
+        label = ', '.join(p for p in parts if p)
+    else:
+        label = f"{lat:.5f}, {lon:.5f}"
+    return jsonify(label=label)
+
 @app.route('/api/dash/devices')
 def dash_devices():
     devices = app_dash.list_usb_storage_partitions()

requirements.txt

@@ -7,4 +7,4 @@ pyserial
 RPi.GPIO
 obd
 requests
-requests-toolbelt
+requests-toolbeltreverse_geocoder

static/js/history.js

@@ -32,20 +32,10 @@
         if (key === _lastGeoKey) return;
         _lastGeoKey = key;
         const fallback = `${lat.toFixed(5)}, ${lon.toFixed(5)}`;
-        fetch(`https://nominatim.openstreetmap.org/reverse?format=jsonv2&lat=${lat}&lon=${lon}`, {
-            headers: { 'Accept-Language': 'en' },
-            signal: AbortSignal.timeout(5000),
-        })
-        .then(r => r.ok ? r.json() : null)
-        .then(data => {
-            if (!data) { replayLocation.textContent = fallback; return; }
-            const a = data.address || {};
-            const road = a.road || a.hamlet || a.village || a.suburb || '';
-            const city = a.city || a.town || a.village || a.municipality || '';
-            replayLocation.textContent = [road, city].filter(Boolean).join(', ')
-                || data.display_name?.split(',').slice(0, 2).join(',') || fallback;
-        })
-        .catch(() => { replayLocation.textContent = fallback; });
+        fetch(`/api/geocode?lat=${lat}&lon=${lon}`, { signal: AbortSignal.timeout(4000) })
+            .then(r => r.ok ? r.json() : null)
+            .then(data => { replayLocation.textContent = (data && data.label) ? data.label : fallback; })
+            .catch(() => { replayLocation.textContent = fallback; });
     }
 
     function scheduleGeocode(lat, lon) {

static/js/yaris.js

@@ -196,22 +196,12 @@ _recenterBtn.addEventListener('click', function () {
 });
 
 function reverseGeocode(lat, lon) {
-    const fallback = `${lat.toFixed(5)}, ${lon.toFixed(5)}`;
     const el = document.getElementById('gps-location-name');
-    fetch(`https://nominatim.openstreetmap.org/reverse?format=jsonv2&lat=${lat}&lon=${lon}`, {
-        headers: { 'Accept-Language': 'en' },
-        signal: AbortSignal.timeout(5000),
-    })
-    .then(r => r.ok ? r.json() : null)
-    .then(data => {
-        if (!data) { el.textContent = fallback; return; }
-        const a = data.address || {};
-        const name = a.road || a.hamlet || a.village || a.suburb || '';
-        const city = a.city || a.town || a.village || a.municipality || '';
-        const label = [name, city].filter(Boolean).join(', ');
-        el.textContent = label || data.display_name?.split(',').slice(0, 2).join(',') || fallback;
-    })
-    .catch(() => { el.textContent = fallback; });
+    const fallback = `${lat.toFixed(5)}, ${lon.toFixed(5)}`;
+    fetch(`/api/geocode?lat=${lat}&lon=${lon}`, { signal: AbortSignal.timeout(4000) })
+        .then(r => r.ok ? r.json() : null)
+        .then(data => { el.textContent = (data && data.label) ? data.label : fallback; })
+        .catch(() => { el.textContent = fallback; });
 }
 
 socket.on('gps_location', function(data) {