// Copyright 2017-2025 @polkadot/util-crypto authors & contributors
// SPDX-License-Identifier: Apache-2.0

import * as sr25519 from '@scure/sr25519';

import { isU8a, u8aToU8a } from '@pezkuwi/util';

export function sr25519DerivePublic (publicKey: string | Uint8Array, chainCode: Uint8Array): Uint8Array {
  const publicKeyU8a = u8aToU8a(publicKey);

  if (!isU8a(chainCode) || chainCode.length !== 32) {
    throw new Error('Invalid chainCode passed to derive');
  } else if (publicKeyU8a.length !== 32) {
    throw new Error(`Invalid publicKey, received ${publicKeyU8a.length} bytes, expected 32`);
  }

  return sr25519.HDKD.publicSoft(publicKeyU8a, chainCode);
}
