import { KeyType } from '../../../../crypto'
import { Key } from '../../../../crypto/Key'
import { AriesFrameworkError } from '../../../../error'

import { VerificationMethod } from './VerificationMethod'

export const VERIFICATION_METHOD_TYPE_X25519_KEY_AGREEMENT_KEY_2019 = 'X25519KeyAgreementKey2019'
type X25519KeyAgreementKey2019 = VerificationMethod & {
  type: typeof VERIFICATION_METHOD_TYPE_X25519_KEY_AGREEMENT_KEY_2019
}

/**
 * Get a X25519KeyAgreementKey2019 verification method.
 */
export function getX25519KeyAgreementKey2019({ key, id, controller }: { id: string; key: Key; controller: string }) {
  return new VerificationMethod({
    id,
    type: VERIFICATION_METHOD_TYPE_X25519_KEY_AGREEMENT_KEY_2019,
    controller,
    publicKeyBase58: key.publicKeyBase58,
  })
}

/**
 * Check whether a verification method is a X25519KeyAgreementKey2019 verification method.
 */
export function isX25519KeyAgreementKey2019(
  verificationMethod: VerificationMethod
): verificationMethod is X25519KeyAgreementKey2019 {
  return verificationMethod.type === VERIFICATION_METHOD_TYPE_X25519_KEY_AGREEMENT_KEY_2019
}

/**
 * Get a key from a X25519KeyAgreementKey2019 verification method.
 */
export function getKeyFromX25519KeyAgreementKey2019(verificationMethod: X25519KeyAgreementKey2019) {
  if (!verificationMethod.publicKeyBase58) {
    throw new AriesFrameworkError('verification method is missing publicKeyBase58')
  }

  return Key.fromPublicKeyBase58(verificationMethod.publicKeyBase58, KeyType.X25519)
}