// Build the choropleth payload from a GameState: every ISO_A3 region maps to its
// owning nation plus that nation's stable color (see shared.nationColor). The
// client merges this onto public/countries.geo.json and calls source.setData().
import { nationColor, type RegionMap } from '../shared/protocol';
import type { GameState } from '../shared/types';

export function buildRegionMap(state: GameState): RegionMap {
  const map: RegionMap = {};
  for (const [id, nation] of Object.entries(state.nations)) {
    const color = nationColor(id);
    for (const code of nation.territory) {
      map[code] = { color, owner: nation.name, ownerId: id };
    }
  }
  return map;
}