import { sha256 } from '@noble/hashes/sha256';
import { bytesToHex } from '@noble/hashes/utils';
import sortKeys from 'sort-keys-recursive';

export enum SyncField {
  // TODO: Reduce to checkpoint or processed
  checkpoint = 'syncCheckpoint',
}

export class SyncApiService {
  signPayload<T>(input: { payload: T; secretKey: string }): { payload: T; signature: string } {
    const { payload, secretKey } = input;
    const sortedPayload = sortKeys(payload);
    const signingMessage = `${JSON.stringify(sortedPayload, (_, value) => (typeof value === 'bigint' ? `${value.toString()}n` : value))}::${secretKey}`;
    const hash = sha256(signingMessage);
    const signature = bytesToHex(hash);
    return {
      payload,
      signature,
    };
  }

  verify<T>(input: { payload: T; secretKey: string; signature: string }): boolean {
    const { payload, secretKey, signature } = input;
    const result = this.signPayload({ payload, secretKey });
    return result.signature === signature;
  }
}