import { EndpointInterface } from '@data-client/endpoint';

export interface HookableEndpointInterface extends EndpointInterface {
  extend(...args: any): HookableEndpointInterface;
}

/** Turns a collection of Endpoints (Resource) into a collection of hooks.
 * This is useful for Endpoints that need hooks to prepare their fetch requests.
 *
 * @see https://dataclient.io/rest/api/hookifyResource
 */
export default function hookifyResource<R extends {}>(
  resource: R,
  useRequestInit: () => RequestInit,
): HookResource<R> {
  const usingResource: Record<string, () => HookableEndpointInterface> = {};
  Object.keys(resource).forEach(key => {
    const endpoint = (resource as any)[key];
    if (endpoint.extend !== undefined)
      usingResource[`use${capitalizeFirstLetter(key)}`] = () => {
        // this is false positive due to the dynamic nature of assignment
        // eslint-disable-next-line react-hooks/rules-of-hooks
        const requestInit = useRequestInit();
        return endpoint.extend({ requestInit });
      };
  });
  return usingResource as any;
}

export type HookResource<R extends {}> = {
  [K in Extract<keyof R, string> as `use${Capitalize<K>}`]: () => R[K];
};

function capitalizeFirstLetter(s: string) {
  return s.charAt(0).toUpperCase() + s.slice(1);
}