import { InjectionToken, OptionalFactoryDependency, Provider } from '@nestjs/common';

import { AbstractActionHandler } from '../abstract-action.handler';
import { Action } from '../action.enum';
import { ExistingActionHandlers } from './default-action-handler.constants';

export const ExistingActionHandlersProvider = (inject: Array<InjectionToken | OptionalFactoryDependency>): Provider => ({
  provide: ExistingActionHandlers,
  useFactory: (...args: AbstractActionHandler[]) => args.reduce((m, h) => {
    m[h.action] = h;
    return m;
  }, {} as Record<Action, AbstractActionHandler>),
  inject,
});