ng-eventually/packages/client/src/polyfill.ts

/**
 * The polyfill bootstrap — the ONLY non-SDK surface of the client.
 *
 * It injects the REAL SDK and the polyfill settings; afterwards the SDK-shaped
 * exports (`ng`, `useShape`, `inbox`) behave as drop-ins. This is exposed at the
 * subpath `@ng-eventually/client/polyfill` so the main entry
 * (`@ng-eventually/client`) stays a **pure, SDK-identical** surface. Everything
 * here is removed at migration.
 */

import type { NgLike, UseShapeLike, PrincipalId } from "./types";
import type { RegistrySession } from "./store-registry";
import { CapRegistry } from "./caps";

/**
 * Consumer-injected dependencies of the storeRegistry (polyfill-era). The
 * registry itself is generic (it knows only native scopes); the consumer wires
 * up how to reach the shared-wallet session and how to normalize a username
 * used as the shim key. Removed at migration along with the whole shim.
 */
export interface StoreRegistryDeps {
  /** Resolve the current shared-wallet session (id + private-store anchor). */
  getSession: () => Promise<RegistrySession>;
  /** Normalize a username for shim keying. Default: trim (identity-ish). */
  normalizeUser?: (username: string) => string;
}

export interface EventuallyConfig {
  /** The REAL `@ng-org/web` `ng` (injected to avoid a hard import / alias loop). */
  ng: NgLike;
  /** The REAL `@ng-org/orm` `useShape`. */
  useShape: UseShapeLike;
  /** Shared-wallet credentials — polyfill only (one wallet for everyone). */
  sharedWallet?: { name: string; secret: string };
  /** Initial current user; may also be set later via {@link setCurrentUser}. */
  currentUser?: PrincipalId;
  /** REAL `@ng-org/web` `init` (lifecycle) — forwarded by the lib's `init()`. */
  init?: (...args: any[]) => any;
  /** REAL `@ng-org/orm` `initNg` (ORM signals) — forwarded by the lib's `initNg()`. */
  initNg?: (...args: any[]) => any;
}

let cfg: EventuallyConfig | null = null;
let currentUser: PrincipalId | null = null;
let registryDeps: Required<StoreRegistryDeps> | null = null;
/** The emulated ReadCap/WriteCap registry. Empty until the app declares caps;
 *  while it has no read policy the read filter passes through (no regression). */
let caps = new CapRegistry();

export function configure(c: EventuallyConfig): void {
  cfg = c;
  currentUser = c.currentUser ?? null;
}

/** @internal — used by the SDK-shaped wrappers to reach the injected real SDK. */
export function getConfig(): EventuallyConfig {
  if (!cfg) throw new Error("[ng-eventually] configure() must be called before use");
  return cfg;
}

/** Reset the injected config back to un-configured (mainly for tests, so a
 *  suite that calls configure() can restore the not-configured guard state). */
export function resetConfig(): void {
  cfg = null;
  currentUser = null;
}

/**
 * Wire the storeRegistry's consumer-injected dependencies (session + username
 * normalization). Must be called before any storeRegistry.* use. Separate from
 * {@link configure} because it's storeRegistry-specific and, like the shim,
 * disappears at migration.
 */
export function configureStoreRegistry(deps: StoreRegistryDeps): void {
  registryDeps = {
    getSession: deps.getSession,
    normalizeUser: deps.normalizeUser ?? ((u: string) => u.trim()),
  };
}

/** @internal — used by the storeRegistry to reach its injected dependencies. */
export function getStoreRegistryDeps(): Required<StoreRegistryDeps> {
  if (!registryDeps) {
    throw new Error("[ng-eventually] configureStoreRegistry() must be called before use");
  }
  return registryDeps;
}

/** Reset storeRegistry deps (mainly for tests). */
export function resetStoreRegistry(): void {
  registryDeps = null;
}

/** Set the current app-level user (the polyfill's notion of "who am I"). */
export function setCurrentUser(id: PrincipalId | null): void {
  currentUser = id;
}

export function getCurrentUser(): PrincipalId | null {
  return currentUser;
}

/** The emulated cap registry — the app grants/opens caps on it (as it will via
 *  real cap operations in the target). The read filter consults it. */
export function getCaps(): CapRegistry {
  return caps;
}

/** Reset all emulated caps (mainly for tests / fresh sessions). */
export function resetCaps(): void {
  caps = new CapRegistry();
}

// Cap surface — polyfill-era (caps are emulated now; native at migration).
// Re-exported here so the whole polyfill API lives under /polyfill.
export { CapRegistry } from "./caps";