use erigon_db::{Erigon, env_open};
use ethereum_types::Address;

fn main() -> eyre::Result<()> {
    let path = std::path::Path::new(env!("ERIGON_CHAINDATA"));

    // Open an mdbx environment and begin a read-only database transaction
    let env = env_open(path)?;
    let db = Erigon::begin(&env)?;

    // get the canonical head block header
    let head_hash = db.read_head_header_hash()?.unwrap();
    let head_num = db.read_header_number(head_hash)?.unwrap();
    let header = db.read_header((head_num, head_hash))?.unwrap();

    // get the current state of an account
    let contract: Address = "0x0d4c6c6605a729a379216c93e919711a081beba2".parse()?;
    let account = db.read_account(contract)?.unwrap();
    let bytecode = db.read_code(account.codehash)?.unwrap();

    // get all of the contract's populated storage slots
    // (incarnation is an Erigon-specific value related to removal/revival of contracts)
    for read in db.walk_storage(contract, account.incarnation, None)? {
        let (slot, value) = read?;
        println!("The value at slot {} is {}", slot, value);
    }

    // get the state of the account at block 100
    let old_account = db.read_account_hist(contract, 100)?.unwrap_or_default();

    Ok(())
}