gods-eye-view/src/layers/bikeshare/index.js

import { createIngestion } from './ingestion.js';
import { createModel } from './model.js';
import { createQueries } from './queries.js';
import { createTesting } from './testing.js';
import { createControls } from './controls.js';
import { createState } from './state.js';
import { createBikeshareSelectedOverlayEntry } from './selectionModel.js';

/** Construct one layer with its own scene state and supplied application services. */
export function createBikeshareLayer({ services, source, rendererFactory }) {
  if (typeof source?.getStations !== 'function')
    throw new TypeError('A bikeshare source is required');
  if (typeof rendererFactory !== 'function')
    throw new TypeError('A bikeshare renderer factory is required');
  const state = createState({ services });
  const parts = {};
  const context = { state, services, parts, source };
  parts.ingestion = createIngestion(context);
  parts.model = createModel(context);
  parts.queries = createQueries(context);
  parts.testing = createTesting(context);
  parts.controls = createControls(context);
  let renderer = null;
  let initialized = false;
  const lifecycle = {
    init(viewer, options) {
      return this.attachRenderer(options);
    },
    picks: {
      owner: 'bikeshare',
      predicate: (id) => state._stationRenderMap.has(id),
    },
    attachRenderer(options = {}) {
      if (initialized)
        throw new Error('Bikeshare layer is already initialized');
      renderer ??= rendererFactory({
        ...context,
        engine: options.engine ?? null,
      });
      if (!renderer) throw new Error('Bikeshare renderer is unavailable');
      parts.display = renderer;
      initialized = true;
      try {
        state._sceneContext = options;
        renderer.init();
        if (state._enabled) {
          const selected = state._selectedKey;
          for (const city of state._activeCityIds) {
            const stations = state._stationInfoCache.get(city);
            if (!stations) continue;
            parts.display.ensureCityPoints(city, stations);
            const status = state._statusCache.get(city)?.statusMap;
            if (status) parts.display.applyStatusToPoints(city, status);
          }
          if (selected) parts.display._selectStation(selected);
          renderer.show();
        }
      } catch (error) {
        initialized = false;
        throw error;
      }
    },
    resumeViewport() {
      if (state._enabled) parts.display?.onCameraChanged();
    },
    detachRenderer() {
      if (!renderer) return;
      state._sceneContext = null;
      clearTimeout(state._cameraDebounceTimer);
      const selected = state._selectedKey;
      renderer.detach();
      state._selectedKey = selected;
      state._cityRuntime.clear();
      state._stationRenderMap.clear();
      state._engine = null;
      renderer = null;
      initialized = false;
      parts.display = null;
    },
    enable(...args) {
      return renderer?.enable(...args);
    },
    disable(...args) {
      return renderer?.disable(...args);
    },
    destroy(...args) {
      try {
        return renderer?.destroy(...args);
      } finally {
        state._dataManager = null;
        renderer = null;
        initialized = false;
        parts.display = null;
      }
    },
  };
  return Object.assign(
    {},
    parts.controls.methods,
    lifecycle,
    parts.ingestion?.methods,
    {
      createBikeshareSelectedOverlayEntry,
      _setBikeshareSelectionStateForTest: (options) => {
        renderer ??= rendererFactory({
          ...context,
          engine: options.engine,
        });
        parts.display = renderer;
        parts.testing._setBikeshareSelectionStateForTest(options);
      },
      _selectBikeshareStationForTest:
        parts.testing._selectBikeshareStationForTest,
      _clearBikeshareSelectionForTest:
        parts.testing._clearBikeshareSelectionForTest,
    },
  );
}
export {
  BIKESHARE_SELECTED_OVERLAY_SOURCE_ID,
  BIKESHARE_SELECTED_OVERLAY_SOURCE_OPTIONS,
} from './policy.js';

export { createBikeshareSource } from './source.js';