refactor: separate traffic and bikeshare components

src/layers/bikeshare/state.js

@@ -0,0 +1,110 @@
+export function createState({ services }) {
+  const { setOverlayEntries, setOverlaySourceVisible, clearOverlaySource } =
+    services.overlays;
+  const layerState = {};
+
+  layerState.DEFAULT_OVERLAY_HOST = Object.freeze({
+    setEntries: setOverlayEntries,
+    setVisible: setOverlaySourceVisible,
+    clearSource: clearOverlaySource,
+  });
+
+  layerState._overlayHost = layerState.DEFAULT_OVERLAY_HOST;
+
+  // ---------------------------------------------------------------------------
+  // Module-level mutable state
+  // ---------------------------------------------------------------------------
+
+  /** @type {Cesium.Viewer|null} Active Cesium viewer instance. */
+
+  layerState._viewer = null;
+
+  /** @type {Cesium.PointPrimitiveCollection|null} Primitive collection for station dots. */
+
+  layerState._pointCollection = null;
+
+  /** Whether the bikeshare layer is currently enabled. */
+
+  layerState._enabled = false;
+
+  /** Timer handle for camera-move debounce. */
+
+  layerState._cameraDebounceTimer = null;
+
+  /** Whether the camera.changed listener is currently attached. */
+
+  layerState._cameraChangedAttached = false;
+
+  /** Hysteresis flag for altitude-based activation. */
+
+  layerState._altitudeGateEnabled = false;
+
+  /** Monotonic generation counter; incremented on each proximity check to cancel stale work. */
+
+  layerState._proximityGeneration = 0;
+
+  /** @type {Set<string>} City ids currently considered in-range. */
+
+  layerState._activeCityIds = new Set();
+
+  /** @type {Map<string, { stationKeys: Set<string> }>} Per-city runtime tracking of rendered station keys. */
+
+  layerState._cityRuntime = new Map();
+
+  /** @type {Map<string, Map<string, Object>>} Cached station information per city (cityId -> stationId -> StationInfo). */
+
+  layerState._stationInfoCache = new Map();
+
+  /** @type {Map<string, { timestamp: number, statusMap: Map<string, Object> }>} Cached station status per city. */
+
+  layerState._statusCache = new Map();
+
+  /** @type {Map<string, { promise: Promise, controller: AbortController, generation: number }>} In-flight station info requests. */
+
+  layerState._inFlightInfo = new Map();
+
+  /** @type {Map<string, { promise: Promise, controller: AbortController, generation: number }>} In-flight station status requests. */
+
+  layerState._inFlightStatus = new Map();
+
+  /** @type {Map<string, Object>} Render records keyed by "cityId:stationId". */
+
+  layerState._stationRenderMap = new Map();
+
+  /** @type {Cesium.ScreenSpaceEventHandler|null} Click handler for station selection. */
+
+  layerState._clickHandler = null;
+
+  /** @type {string|null} Key of the currently selected station, or null. */
+
+  layerState._selectedKey = null;
+
+  /** @type {Cesium.Entity|null} Entity used to display the selected-station point highlight. */
+
+  layerState._selectedEntity = null;
+
+  /** Total number of currently rendered station points. */
+
+  layerState._count = 0;
+
+  /** Timestamp (ms) of the last successful status update. */
+
+  layerState._lastUpdate = null;
+
+  /** Whether any GBFS fetch is currently in progress. */
+
+  layerState._loading = false;
+
+  /** Reference count of concurrent loading operations. */
+
+  layerState._loadingOps = 0;
+
+  /** Most recent error message string, or null. */
+
+  layerState._error = null;
+
+  /** Whether the MAX_TOTAL_POINTS cap warning has already been logged. */
+
+  layerState._limitWarned = false;
+  return layerState;
+}