import type { Context } from "react";
import { useContext } from "react";
import { isDefined } from "@keycloakify/keycloak-account-ui/ui-shared/utils/isDefined";

/**
 * Passes the call to `useContext` and throw an exception if the resolved value is either `null` or `undefined`.
 * Can be used for contexts that are required and should always have a non nullable value.
 *
 * @param context The context to pass to `useContext`
 * @returns
 */
export function useRequiredContext<T>(context: Context<T>): NonNullable<T> {
  const resolved = useContext(context);

  if (isDefined(resolved)) {
    return resolved;
  }

  throw new Error(
    `No provider found for ${
      context.displayName ? `the '${context.displayName}'` : "an unknown"
    } context, make sure it is included in your component hierarchy.`,
  );
}