import {
  OcpiEndpoint,
  OcpiResponse,
  ocpiRequestRetryingAuthTokenBase64,
  OcpiVersion,
} from "../ocpi-request.js";
import { setSession } from "../login-session.js";

export const INPUT_PARTY_ID_REGEX = /^[A-Z]{2}-?[A-Z0-9]{3}$/i;

type OcpiVersionInformation = {
  version: OcpiVersion;
  endpoints: OcpiEndpoint[];
};

export const login = async (
  platformVersionsUrl: string,
  token: string,
  partyId: string
) => {
  if (!partyId.match(INPUT_PARTY_ID_REGEX)) {
    throw new Error(`Oopsie, login failed: invalid party ID [${partyId}]`);
  }

  let ocpiResponse!: OcpiResponse<OcpiVersionInformation>;

  try {
    ocpiResponse =
      await ocpiRequestRetryingAuthTokenBase64<OcpiVersionInformation>(
        "get",
        platformVersionsUrl,
        token
      );
  } catch (err) {
    throw new Error(
      "Oopsie, login failed: " +
        (err && typeof err == "object" && "message" in err
          ? err.message
          : "(no error message)")
    );
  }

  if (Array.isArray(ocpiResponse.data)) {
    const versions = ocpiResponse.data as { version: string; url: string }[];
    console.info(
      "It's a versions endpoint; please pick one of the version URLs to log in to:"
    );
    versions.forEach((v) => console.info(`\t${v.version}\t${v.url}`));
  } else if (
    typeof ocpiResponse.data == "object" &&
    ocpiResponse.data.version
  ) {
    const version = ocpiResponse.data as OcpiVersionInformation;
    console.info(`It's a version endpoint; version is ${version}`);
    await setSession({
      version: version.version,
      endpoints: version.endpoints as unknown as OcpiEndpoint[],
      token,
      partyId: partyId.replace(/-/, "").toUpperCase(),
    });
    console.info(`Logged in to ${platformVersionsUrl}`);
  } else {
    console.info(
      `The URL at ${platformVersionsUrl} doesn't seem to be any kind of OCPI endpoint`
    );
  }
};