v0.28.0 (#46): per-region stats — area×population-weighted-median Nation.stats (PR 1 of 2)

server/index.ts

@@ -8,7 +8,7 @@ import { existsSync } from 'node:fs';
 import path from 'node:path';
 import { fileURLToPath } from 'node:url';
 
-import { deepClone } from '../shared/protocol';
+import { deepClone, seedRegionStats } from '../shared/protocol';
 import type {
   AddActionRequest,
   AddDiplomacyRequest,
@@ -22,7 +22,7 @@ import { createLlmClient } from './llm';
 import { makeStubLlmClient } from './stub';
 import { askAdvisor, confirmNationOp, queueRoundItem, rejectNationOp, removeRoundItem, runTurn } from './engine';
 import { buildRegionMap } from './map';
-import { allTerritoryKeys, centroidOf, expandCountriesToKeys, hasAdjacency, hasCentroids, loadRegions, neighboursOf, referenceForKeys, validKeys } from './regions';
+import { allTerritoryKeys, centroidOf, expandCountriesToKeys, geoOf, hasAdjacency, hasCentroids, hasGeo, loadRegions, neighboursOf, referenceForKeys, validKeys } from './regions';
 import { createPresetStore } from './presets';
 import { openDb, type Db } from './db';
 
@@ -136,11 +136,18 @@ app.post('/api/games', (req: Request, res) => {
     pendingNationOps: [],
     // (v0.27, #44) No markers on a fresh game; the LLM places them over time.
     markers: [],
+    // (v0.28, #46) Per-region stats are seeded below, once territories hold
+    // real region keys — each region starts as a copy of its owner's initial
+    // stats, so the derived aggregate equals the nation's stats on turn 1.
+    regionStats: {},
   };
   // v0.19 (#16 P1): expand each nation's ISO_A3 country list to the region keys
   // of all its sub-regions, so ownership (and the choropleth) is at region
   // granularity from the very first turn. Preset JSONs stay country-level.
   for (const n of Object.values(state.nations)) n.territory = expandCountriesToKeys(n.territory);
+  // (v0.28, #46): seed per-region stats AFTER the expansion so each owned
+  // region key gets its owner's initial stats (see seedRegionStats).
+  state.regionStats = seedRegionStats(state.nations);
   db.save(state);
   res.json({ game: state });
 });
@@ -295,6 +302,11 @@ app.post('/api/games/:id/jump', async (req, res) => {
       // centroid (without it, marker adds are dropped; existing markers are
       // still maintained).
       centroidOf: hasCentroids() ? (key) => centroidOf(key) : undefined,
+      // (v0.28, #46) when the region-geo manifest (area + population) loaded,
+      // hand the engine the resolver so the end-of-turn recompute weights each
+      // owned region by area×population (without it the aggregate degrades to
+      // an unweighted median — still region-consistent, just unweighted).
+      geoOf: hasGeo() ? (key) => geoOf(key) : undefined,
     });
     db.save(state);
     broadcast(id, 'turn', { state, result });