use ethers::utils::keccak256;
use eyre::Result;
use ethers::prelude::{U256, Address};

use crate::proof::{encode_account, verify_proof};
use crate::consensus_rpc::ExecutionPayload;
use crate::execution_rpc::ExecutionRpc;

pub struct ExecutionClient {
    execution_rpc: ExecutionRpc
}

impl ExecutionClient {
    pub fn new(rpc: &str) -> Self {
        let execution_rpc = ExecutionRpc::new(rpc);
        ExecutionClient { execution_rpc }
    }

    pub async fn get_balance(&self, account: &Address, payload: &ExecutionPayload) -> Result<U256> {
        let proof = self.execution_rpc.get_proof(&account, payload.block_number).await?;

        let account_path = keccak256(account.as_bytes()).to_vec();
        let account_encoded = encode_account(&proof);

        let is_valid = verify_proof(&proof.account_proof, &payload.state_root, &account_path, &account_encoded);

        if !is_valid {
            eyre::bail!("Invalid Proof");
        }

        Ok(proof.balance)
    }
}