// Stubbed versions of angular services using native promises, for use in unit tests

export const $q: QService = {
  when: (value?) => {
    return value ? Promise.resolve(value) : Promise.resolve();
  },
  reject: (reason?: any) => {
    return Promise.reject(reason);
  },
  defer: <T>() => {
    return new DeferredStub<T>();
  },

  all: <T>(promises: Promisify<T>): Promise<T> =>
    Promise.all(Object.keys(promises)
      .map(key => promises[key].then(value => ({ [key]: value }))))
      .then(keyvalues => Object.assign({}, ...keyvalues))
}

class DeferredStub<T> implements Deferred<T> {
  resolve: (value?: T | PromiseLike<T>) => void;
  reject: (reason?: any) => void

  promise: Promise<T> = new Promise((resolve, reject) => {
    this.resolve = resolve;
    this.reject = reject;
  });
}

export const $timeout: TimeoutService = <T>(fn: () => T | PromiseLike<T>, delay?: number) => {
  return new Promise<T>(resolve => setTimeout(() => resolve(fn()), delay));
}