gods-eye-view/src/data/militaryNames.js

import { militaryOsmKey } from '../sources/militaryTileGeometry.js';
export { militaryOsmKey } from '../sources/militaryTileGeometry.js';
import { requestWithDeadline } from '../sources/requestDeadline.js';
import { loadBundledJson } from './bundledJson.js';
import { createRetryableLoader } from './retryableLoad.js';

export const MILITARY_POINT_CAP = 512;
export const MILITARY_LABEL_CAP = 24;

export const MILITARY_NAMES_TIMEOUT_MS = 10_000;

/** Share a bounded acquisition; failed assets become retryable after cooldown. */
export function createMilitaryNamesLoader({
  loadPack = (signal) =>
    loadBundledJson(
      new URL('./local_data/osm_military_names/names.json', import.meta.url),
      { signal },
    ),
  timeoutMs = MILITARY_NAMES_TIMEOUT_MS,
  ...retryOptions
} = {}) {
  return createRetryableLoader(async () => {
    const pack = await requestWithDeadline(loadPack, { timeoutMs });
    const records = pack.records.map(
      ([
        osmKey,
        name,
        longitude,
        latitude,
        west,
        south,
        east,
        north,
        kind,
        areaM2,
      ]) => ({
        id: `osm:military:${osmKey}`,
        osmKey,
        name,
        longitude,
        latitude,
        bbox: [west, south, east, north],
        class: pack.classes[kind],
        areaM2,
        kind: 'installation',
        namedArea: true,
        pointOnly: true,
        validation: 'unreviewed',
        sources: [
          { name: 'OpenStreetMap', id: osmKey },
          { name: 'Overture Maps Foundation', id: osmKey },
        ],
      }),
    );
    records.sort(
      (a, b) => b.areaM2 - a.areaM2 || a.osmKey.localeCompare(b.osmKey),
    );
    return { records, byId: new Map(records.map((r) => [r.osmKey, r])) };
  }, retryOptions);
}

/** Load and index the separate data asset only when installation context needs it. */
export const loadMilitaryNames = createMilitaryNamesLoader();

/** Join exact source identity before parcel merging; reject geographically inconsistent ids. */
export function nameMilitaryFragment(fragment, names) {
  const osmKey = militaryOsmKey(fragment.featureKey);
  const named = names?.byId.get(osmKey);
  if (!named || !fragment.footprint?.length) return fragment;
  const [west, south, east, north] = named.bbox;
  const epsilon = (fragment.tileEpsilon || 0) * 2 + 0.0001;
  const xs = fragment.footprint.map((p) => p[0]);
  const ys = fragment.footprint.map((p) => p[1]);
  if (
    Math.max(...xs) < west - epsilon ||
    Math.min(...xs) > east + epsilon ||
    Math.max(...ys) < south - epsilon ||
    Math.min(...ys) > north + epsilon
  )
    return fragment;
  return {
    ...fragment,
    name: named.name,
    class: named.class,
    osmKey,
    namedArea: true,
    areaM2: named.areaM2,
    nameRecord: named,
  };
}

/**
 * Area-ranked spatial thinning of visible label points, including dateline
 * views. With `thinned` false every point in the box is kept, up to `cap`.
 */
export function militaryNamesInView(
  names,
  box,
  cap = MILITARY_POINT_CAP,
  thinned = true,
) {
  const width =
    box.east >= box.west ? box.east - box.west : 360 + box.east - box.west;
  const height = box.north - box.south;
  const cells = new Set(),
    records = [];
  let count = 0;
  for (const record of names?.records || []) {
    const x = (record.longitude - box.west + 360) % 360;
    if (x > width || record.latitude < box.south || record.latitude > box.north)
      continue;
    count++;
    const cell = `${Math.min(31, Math.floor((x / width) * 32))}:${Math.min(15, Math.floor(((record.latitude - box.south) / height) * 16))}`;
    if ((thinned && cells.has(cell)) || records.length >= cap) continue;
    cells.add(cell);
    records.push(record);
  }
  return { records, count };
}