import { Blake2s } from '../crypto/index.js';
import { AliasHash } from './alias_hash.js';

export class AccountAliasId {
  static ZERO = AccountAliasId.fromBuffer(Buffer.alloc(32));

  constructor(public aliasHash: AliasHash, public accountNonce: number) {}

  static fromAlias(alias: string, accountNonce: number, blake2s: Blake2s) {
    return new AccountAliasId(AliasHash.fromAlias(alias, blake2s), accountNonce);
  }

  static random() {
    return new AccountAliasId(AliasHash.random(), 0);
  }

  public static fromBuffer(id: Buffer) {
    if (id.length !== 32) {
      throw new Error('Invalid id buffer.');
    }

    const aliasHash = new AliasHash(id.slice(4, 32));
    const accountNonce = id.readUInt32BE(0);
    return new AccountAliasId(aliasHash, accountNonce);
  }

  toBuffer() {
    const accountNonceBuf = Buffer.alloc(4);
    accountNonceBuf.writeUInt32BE(this.accountNonce);
    return Buffer.concat([accountNonceBuf, this.aliasHash.toBuffer()]);
  }

  toString() {
    return `0x${this.toBuffer().toString('hex')}`;
  }

  equals(rhs: AccountAliasId) {
    return this.aliasHash.equals(rhs.aliasHash) && this.accountNonce === rhs.accountNonce;
  }
}