use tiny_keccak::{Hasher, Keccak};

use crate::helpers::chainsig::ChainSig;

pub struct Evm {}

impl ChainSig for Evm {
    fn prepare_transaction_for_signing(encoded_tx: String) -> Vec<String> {
        let serialized_tx_bytes =
            hex::decode(encoded_tx.trim_start_matches("0x")).expect("Invalid hex");

        let mut hasher = Keccak::v256();
        hasher.update(&serialized_tx_bytes);
        let mut tx_hash_bytes = [0u8; 32];
        hasher.finalize(&mut tx_hash_bytes);

        vec![hex::encode(tx_hash_bytes)].into()
    }
}