import { clearLoginFlowCookie, finishLogin } from "$lib/server/auth";
import { error, redirect } from "@sveltejs/kit";
import type { RequestHandler } from "./$types";

export const GET: RequestHandler = async (event) => {
  const providerError = event.url.searchParams.get("error");
  if (providerError) {
    clearLoginFlowCookie(event.cookies);
    const providerErrorDescription =
      event.url.searchParams.get("error_description");
    throw error(
      400,
      providerErrorDescription
        ? `${providerError}: ${providerErrorDescription}`
        : `OIDC callback failed: ${providerError}`,
    );
  }

  let returnTo: string;
  try {
    returnTo = await finishLogin(event);
  } catch (cause) {
    throw error(
      400,
      cause instanceof Error ? cause.message : "OIDC callback failed",
    );
  }

  throw redirect(303, returnTo);
};