import {
  type IEither,
  isEither,
  type ITraceable,
} from "@emprespresso/pengueno";

export type ResponseBody = object | string;
export type TResponseInit = ResponseInit & { status: number };
const withJsonResponseType = (opts: TResponseInit): TResponseInit => {
  return {
    ...opts,
    headers: {
      "Content-Type": "application/json",
      ...(opts?.headers),
    },
  };
};

export class JsonResponse extends Response {
  constructor(
    e: ITraceable<IEither<ResponseBody, ResponseBody>>,
    opts: TResponseInit,
  ) {
    const responseOpts = withJsonResponseType(opts);
    const baseBody = {
      responseTime: Date.now(),
    };
    if (isEither<ResponseBody, ResponseBody>(e)) {
      super(
        JSON.stringify(
          e.fold((err, ok) => err ? ({ error: err! }) : ({ ok: ok! })),
        ),
        responseOpts,
      );
      return;
    }
    super(
      JSON.stringify(
        (Math.floor(responseOpts.status / 100) < 4) ? { ok: e } : { error: e },
      ),
      responseOpts,
    );
  }
}