use ciphersuite::{Ciphersuite, Secp256k1};
use dkg::ThresholdKeys;

use ethereum_schnorr::PublicKey;

pub(crate) struct KeyGenParams;
impl key_gen::KeyGenParams for KeyGenParams {
  const ID: &'static str = "Ethereum";

  type ExternalNetworkCiphersuite = Secp256k1;

  fn tweak_keys(keys: &mut ThresholdKeys<Self::ExternalNetworkCiphersuite>) {
    while PublicKey::new(keys.group_key()).is_none() {
      *keys = keys.offset(<Secp256k1 as Ciphersuite>::F::ONE);
    }
  }

  fn encode_key(key: <Self::ExternalNetworkCiphersuite as Ciphersuite>::G) -> Vec<u8> {
    PublicKey::new(key).unwrap().eth_repr().to_vec()
  }

  fn decode_key(key: &[u8]) -> Option<<Self::ExternalNetworkCiphersuite as Ciphersuite>::G> {
    PublicKey::from_eth_repr(key.try_into().ok()?).map(|key| key.point())
  }
}