use std::{fs::File, io::BufReader, path::PathBuf, str::FromStr};

use anyhow::{anyhow, Result};

use crate::{config::WalletConfig, HOME_DIR_ENV_VAR};

///Get home dir for wallet. Env var `NSSA_WALLET_HOME_DIR` must be set before execution to succeed.
pub fn get_home() -> Result<PathBuf> {
    Ok(PathBuf::from_str(&std::env::var(HOME_DIR_ENV_VAR)?)?)
}

///Fetch config from `NSSA_WALLET_HOME_DIR`
pub fn fetch_config() -> Result<WalletConfig> {
    let config_home = get_home()?;
    let file = File::open(config_home.join("wallet_config.json"))?;
    let reader = BufReader::new(file);

    Ok(serde_json::from_reader(reader)?)
}

//ToDo: Replace with structures conversion in future
pub fn produce_account_addr_from_hex(hex_str: String) -> Result<[u8; 32]> {
    hex::decode(hex_str)?
        .try_into()
        .map_err(|_| anyhow!("Failed conversion to 32 bytes"))
}