test: exercise traffic with current vector and terrain fixtures

scripts/traffic-fixtures.mjs

@@ -1,56 +1,114 @@
-import { readFileSync } from 'node:fs';
-import { decodeFlowTile } from '../src/layers/traffic/flowDecode.js';
-import { tilesForBounds } from '../src/data/tomtomTiles.js';
+import { PbfWriter } from 'pbf';
 
-const tile = readFileSync(
-  new URL(
-    '../src/data/fixtures/tomtom-flow-austin-12-935-1686.pbf',
-    import.meta.url,
-  ),
-);
 const json = (body) => ({
   status: 200,
   contentType: 'application/json',
   body: JSON.stringify(body),
 });
 
-/** Reuse the recorded flow tile for an explicitly synthetic browser exercise. */
+// Cesium heightmap-1.0: 65x65 little-endian uint16 heights, scale .2,
+// offset -1000, followed by child availability and a uniform land mask.
+const flatTerrain = Buffer.alloc(65 * 65 * 2 + 2);
+for (let i = 0; i < 65 * 65; i++) flatTerrain.writeUInt16LE(5000, i * 2);
+
+/** Synthetic, geographically aligned motor roads at both source zooms. */
+export function trafficFixtureTile(zoom, flow = false) {
+  const writer = new PbfWriter();
+  writer.writeMessage(
+    3,
+    (_, layer) => {
+      layer.writeVarintField(15, 2);
+      layer.writeStringField(1, flow ? 'Traffic flow' : 'transportation');
+      layer.writeVarintField(5, 4096);
+      layer.writeStringField(3, flow ? 'traffic_level' : 'class');
+      layer.writeMessage(
+        4,
+        (_, value) => {
+          if (flow) value.writeDoubleField(3, 0.6);
+          else value.writeStringField(1, 'primary');
+        },
+        null,
+      );
+      if (flow) {
+        layer.writeStringField(3, 'road_type');
+        layer.writeMessage(
+          4,
+          (_, value) => value.writeStringField(1, 'Major road'),
+          null,
+        );
+      }
+      // z12 has four times the span of z14. Keep the same world spacing,
+      // and cover only alternate roads with flow to exercise hide/sim controls.
+      const step = 256 * 2 ** (zoom - 14);
+      for (let y = step; y < 4096; y += step) {
+        if (flow && (y / step) % 2) continue;
+        layer.writeMessage(
+          2,
+          (_, feature) => {
+            feature.writeVarintField(3, 2);
+            feature.writePackedVarint(2, flow ? [0, 0, 1, 1] : [0, 0]);
+            feature.writePackedVarint(4, [9, 0, y * 2, 10, 8192, 0]);
+          },
+          null,
+        );
+      }
+    },
+    null,
+  );
+  return Buffer.from(writer.finish());
+}
+
+/** Intercept the current vector sources; never fall through to live roads. */
 export function trafficFixtureResponse(request) {
   const url = new URL(request.url());
+  if (url.hostname === 'terrain.reearth.land') {
+    if (url.pathname.endsWith('/layer.json'))
+      return json({
+        tilejson: '2.1.0',
+        format: 'heightmap-1.0',
+        version: 'qa-flat',
+        scheme: 'tms',
+        projection: 'EPSG:4326',
+        minzoom: 0,
+        maxzoom: 0,
+        tiles: ['{z}/{x}/{y}.terrain?v={version}'],
+        available: [[{ startX: 0, startY: 0, endX: 1, endY: 0 }]],
+        attribution:
+          'Synthetic flat terrain for Traffic QA; not live elevation data',
+      });
+    if (/\/0\/[01]\/0\.terrain$/.test(url.pathname))
+      return {
+        status: 200,
+        contentType: 'application/octet-stream',
+        body: flatTerrain,
+      };
+    throw new Error(`Unexpected terrain fixture request: ${url.pathname}`);
+  }
   if (url.pathname === '/api/tomtom/status')
     return json({ hasKey: true, dailyCount: 0 });
-  if (/^\/api\/tomtom\/flow\/\d+\/\d+\/\d+\.pbf$/.test(url.pathname))
-    return { status: 200, contentType: 'application/x-protobuf', body: tile };
-  if (url.pathname !== '/api/overpass') return null;
-  const query = new URLSearchParams(request.postData()).get('data') || '';
-  if (!query.includes('highway')) return null;
-  const match = query.match(/\((-?[\d.]+),(-?[\d.]+),(-?[\d.]+),(-?[\d.]+)\)/);
-  if (!match) throw new Error('Missing road fixture viewport');
-  const [south, west, north, east] = match.slice(1).map(Number);
-  const inside = ([lon, lat]) =>
-    lat >= south && lat <= north && lon >= west && lon <= east;
-  const segments = tilesForBounds({ south, west, north, east }, 12).flatMap(
-    ({ z, x, y }) => decodeFlowTile(tile, z, x, y),
+  const flow = url.pathname.match(
+    /^\/api\/tomtom\/flow\/(\d+)\/\d+\/\d+\.pbf$/,
   );
-  const elements = segments
-    .filter((segment) => segment.coords.some(inside))
-    .slice(0, 240)
-    .map((segment, index) => ({
-      type: 'way',
-      id: index + 1,
-      tags: { highway: 'primary', oneway: 'yes' },
-      geometry: segment.coords.map(([lon, lat]) => ({ lon, lat })),
-    }));
-  const latitude = (south + north) / 2,
-    longitude = (west + east) / 2;
-  elements.push({
-    type: 'way',
-    id: 99999,
-    tags: { highway: 'residential' },
-    geometry: [
-      { lat: latitude, lon: longitude },
-      { lat: latitude + 0.003, lon: longitude + 0.003 },
-    ],
-  });
-  return json({ elements });
+  if (flow)
+    return {
+      status: 200,
+      contentType: 'application/x-protobuf',
+      body: trafficFixtureTile(Number(flow[1]), true),
+    };
+  if (url.hostname !== 'tiles.openfreemap.org') return null;
+  if (url.pathname === '/planet')
+    return json({
+      tilejson: '3.0.0',
+      minzoom: 0,
+      maxzoom: 14,
+      tiles: ['https://tiles.openfreemap.org/qa-traffic/{z}/{x}/{y}.pbf'],
+    });
+  const road = url.pathname.match(/^\/qa-traffic\/(\d+)\/\d+\/\d+\.pbf$/);
+  if (!road)
+    throw new Error(`Unrecognized road fixture request: ${url.pathname}`);
+  return {
+    status: 200,
+    contentType: 'application/x-protobuf',
+    body: trafficFixtureTile(Number(road[1])),
+  };
 }