map: click a region to switch the dossier to its owner; fix "no owner" (v0.7.0)

2026-10-11 19:22:33 +00:00
parent 67f48fb99c
commit eadae4dc4f
6 changed files with 162 additions and 44 deletions
@@ -56,6 +56,23 @@ export interface RegionOwner {
 }
 export type RegionMap = Record<string, RegionOwner>;

+/**
+ * Look up the owner record for a map region from the authoritative RegionMap by
+ * its ISO_A3 code. Returns `undefined` for an empty/missing code or an unowned
+ * region. Pure + shared: the client resolves a clicked or hovered map feature by
+ * first reading the feature's stable ISO_A3 code (stored in `properties.regionId`
+ * by the client when it repacks the source — see WorldMap) and then calling this.
+ *
+ * The code must NOT be taken from the feature's top-level `id`: MapLibre repacks
+ * a GeoJSON source's `id` (an ISO_A3 string) into a numeric index when it stores
+ * the source, so at click/hover time `feature.id` is a number, never the ISO_A3
+ * — resolving from it is exactly the "no owner" bug (#6).
+ */
+export function regionOwner(regions: RegionMap, isoA3: string | null | undefined): RegionOwner | undefined {
+  if (!isoA3) return undefined;
+  return regions[isoA3];
+}
+
 /** Server -> client Server-Sent Events payload (see server/index.ts /sse). */
 export type SseMessage =
  | { type: 'state'; state: GameState }