import { observer } from "mobx-react";
import type { ReactNode } from "react";
import useSWR from "swr";
// components
import { LogoSpinner } from "@/components/common/logo-spinner";
import { InstanceNotReady, MaintenanceView } from "@/components/instance";
// hooks
import { useInstance } from "@/hooks/store/use-instance";

type TInstanceWrapper = {
  children: ReactNode;
};

const InstanceWrapper = observer(function InstanceWrapper(
  props: TInstanceWrapper,
) {
  const { children } = props;
  // store
  const { isLoading, instance, error, fetchInstanceInfo } = useInstance();

  const { isLoading: isInstanceSWRLoading } = useSWR(
    "INSTANCE_INFORMATION",
    async () => await fetchInstanceInfo(),
    {
      revalidateOnFocus: false,
      // Retry a few times with backoff to handle Firebase cold-start offline errors
      errorRetryCount: 3,
      errorRetryInterval: 2000,
    },
  );

  // loading state
  if ((isLoading || isInstanceSWRLoading) && !instance)
    return (
      <div className="relative flex h-screen w-full items-center justify-center">
        <LogoSpinner />
      </div>
    );

  // Only show maintenance for confirmed hard errors (not transient offline)
  if (error && error?.status === "error") return <MaintenanceView />;

  // instance is not ready and setup is not done
  if (instance?.is_setup_done === false) return <InstanceNotReady />;

  return <>{children}</>;
});

export default InstanceWrapper;