feat(dashboard): map latest user locations

apps/web/src/lib/user-location-map.test.ts

@@ -0,0 +1,31 @@
+import { describe, expect, it } from "vitest";
+import { parseUserLocation, projectWorldPoint } from "./user-location-map";
+
+describe("user location map", () => {
+  it("extracts a valid approximate location from cached IP intelligence", () => {
+    expect(parseUserLocation({
+      classification: "clear",
+      location: {
+        city: "Mountain View",
+        region: "California",
+        countryCode: "US",
+        latitude: 37.4056,
+        longitude: -122.0775,
+      },
+    })).toEqual({
+      latitude: 37.4056,
+      longitude: -122.0775,
+      label: "Mountain View, California, US",
+    });
+  });
+
+  it("rejects missing and out-of-range coordinates", () => {
+    expect(parseUserLocation({ location: { latitude: 91, longitude: 0 } })).toBeNull();
+    expect(parseUserLocation({ location: { city: "Unknown" } })).toBeNull();
+  });
+
+  it("projects longitude and latitude into an equirectangular SVG", () => {
+    expect(projectWorldPoint(0, 0, 800, 400)).toEqual({ x: 400, y: 200 });
+    expect(projectWorldPoint(90, 180, 800, 400)).toEqual({ x: 800, y: 0 });
+  });
+});

apps/web/src/lib/user-location-map.ts

@@ -0,0 +1,41 @@
+type UnknownMap = Record<string, unknown>;
+
+function objectValue(value: unknown): UnknownMap | null {
+  return value && typeof value === "object" && !Array.isArray(value)
+    ? value as UnknownMap
+    : null;
+}
+
+function coordinate(value: unknown) {
+  if (typeof value === "number" && Number.isFinite(value)) return value;
+  if (typeof value === "string" && value.trim() && Number.isFinite(Number(value))) return Number(value);
+  return null;
+}
+
+export interface ParsedUserLocation {
+  latitude: number;
+  longitude: number;
+  label: string;
+}
+
+export function parseUserLocation(value: unknown): ParsedUserLocation | null {
+  const intelligence = objectValue(value);
+  const location = objectValue(intelligence?.location);
+  if (!location) return null;
+  const latitude = coordinate(location.latitude);
+  const longitude = coordinate(location.longitude);
+  if (latitude === null || longitude === null || latitude < -90 || latitude > 90 || longitude < -180 || longitude > 180) {
+    return null;
+  }
+  const label = [location.city, location.region, location.countryCode ?? location.country]
+    .filter((part): part is string => typeof part === "string" && part.trim().length > 0)
+    .join(", ");
+  return { latitude, longitude, label: label || "Approximate location unavailable" };
+}
+
+export function projectWorldPoint(latitude: number, longitude: number, width: number, height: number) {
+  return {
+    x: ((longitude + 180) / 360) * width,
+    y: ((90 - latitude) / 180) * height,
+  };
+}