import React, { createContext, useContext, useMemo } from 'react';
import { canEditSub, canReadSub, isScopeOwn } from '../constants/permissions';

interface PermissionsContextValue {
  permissions: string[] | null;
}

const PermissionsContext = createContext<PermissionsContextValue>({ permissions: null });

export const PermissionsProvider: React.FC<{ permissions: string[] | null; children: React.ReactNode }> = ({
  permissions,
  children,
}) => {
  const value = useMemo(() => ({ permissions }), [permissions]);
  return <PermissionsContext.Provider value={value}>{children}</PermissionsContext.Provider>;
};

export function usePermissions() {
  return useContext(PermissionsContext);
}

/** Права на подраздел: можно ли читать, редактировать, только своё */
export function useSubPermission(section: string, subId: string) {
  const { permissions } = usePermissions();
  const list = permissions ?? [];
  return useMemo(
    () => ({
      canRead: canReadSub(list, section, subId),
      canEdit: canEditSub(list, section, subId),
      scopeOwn: isScopeOwn(list, section, subId),
    }),
    [list, section, subId]
  );
}