/*---------------------------------------------------------------------------------------------
 *  Copyright (c) Microsoft Corporation. All rights reserved.
 *  Licensed under the MIT License. See License.txt in the project root for license information.
 *--------------------------------------------------------------------------------------------*/

import { SyncDescriptor } from './descriptors';
import { ServiceIdentifier, BrandedService } from './instantiation';

const _registry: [ServiceIdentifier<any>, SyncDescriptor<any>][] = [];

export function registerSingleton<T, Services extends BrandedService[]>(
  id: ServiceIdentifier<T>,
  ctor: new (...services: Services) => T,
  supportsDelayedInstantiation?: boolean
): void;
export function registerSingleton<T, Services extends BrandedService[]>(
  id: ServiceIdentifier<T>,
  descriptor: SyncDescriptor<any>
): void;
export function registerSingleton<T, Services extends BrandedService[]>(
  id: ServiceIdentifier<T>,
  ctorOrDescriptor: { new (...services: Services): T } | SyncDescriptor<any>,
  supportsDelayedInstantiation?: boolean
): void {
  if (!(ctorOrDescriptor instanceof SyncDescriptor)) {
    ctorOrDescriptor = new SyncDescriptor<T>(
      ctorOrDescriptor as new (...args: any[]) => T,
      [],
      supportsDelayedInstantiation
    );
  }

  _registry.push([id, ctorOrDescriptor]);
}

export function getSingletonServiceDescriptors(): [
  ServiceIdentifier<any>,
  SyncDescriptor<any>
][] {
  return _registry;
}