import { Option, pipe } from "effect";
import { Page } from "playwright/test";

export type BackendHeaders = {
  authString: string;
  nonce: string;
};

/**
 * @throws Lève une exception si la balise du JSON est introuvable.
 */
export const getBackendHeadersFromHtml = async (page: Page): Promise<BackendHeaders> => {
  const backendHeaders: BackendHeaders | undefined = pipe(
    Option.fromNullable(await page.locator("#injection-v2").textContent()),
    Option.andThen(j => JSON.parse(j) as BackendHeaders),
    Option.getOrUndefined,
  );

  if (backendHeaders === undefined) {
    throw new Error("The JSON of the backend headers in the page's HTML can't be null.");
  }

  return backendHeaders;
};