//
// Copyright 2026 DXOS.org
//

import * as Atom from '@effect-atom/atom/Atom';
import * as Layer from 'effect/Layer';

import { Event } from '@dxos/async';

import * as Registry from '../Registry';

/**
 * Noop `Registry.Service` layer for testing — always returns empty query results.
 * Use this in test layer stacks that require `Registry.Service` but don't need
 * actual registry contents.
 */
export const registryLayerNoop: Layer.Layer<Registry.Service> = Layer.succeed(Registry.Service, {
  [Registry.TypeId]: Registry.TypeId,
  id: 'noop-registry',
  changed: new Event<void>(),
  local: [],
  add: () => {},
  remove: () => false,
  clear: () => {},
  get: () => undefined,
  getByURI: () => undefined,
  list: () => [],
  // QueryFn is an overloaded interface — a single generic function cannot satisfy both overload
  // signatures without a cast. This is the intentional type-system boundary.
  query: ((_queryOrFilter: unknown) => ({
    results: [],
    entries: [],
    run: async () => [],
    runEntries: async () => [],
    runSync: () => [],
    runSyncEntries: () => [],
    first: async (): Promise<never> => {
      throw new Error('registryLayerNoop: registry is empty');
    },
    firstOrUndefined: async () => undefined,
    subscribe: () => () => {},
    atom: Atom.make((): never[] => []),
  })) as Registry.Registry['query'],
} satisfies Registry.Registry);