use crate::{error::Error, prelude::*};
use sp_core::Pair as _;

pub type PairSigner = subxt::tx::PairSigner<subxt::PolkadotConfig, sp_core::sr25519::Pair>;

pub struct Signer {
    pair: Pair,
    signer: PairSigner,
}

impl std::fmt::Display for Signer {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(f, "{}", self.signer.account_id())
    }
}

impl Clone for Signer {
    fn clone(&self) -> Self {
        Self { pair: self.pair.clone(), signer: PairSigner::new(self.pair.clone()) }
    }
}

impl Signer {
    pub fn new(mut seed_or_path: &str) -> Result<Self, Error> {
        seed_or_path = seed_or_path.trim();

        let seed = match std::fs::read(seed_or_path) {
            Ok(s) => String::from_utf8(s).map_err(|e| Error::Other(e.to_string()))?,
            Err(_) => seed_or_path.to_stirng(),
        };

        let seed = seed.trim();
        let pair = Pair::from_string(seed, None).map_err(Error::Crypto)?;
        let signer = PairSigner::new(pair.clone());

        Ok(Self { pair, signer })
    }
}

impl std::ops::Deref for Signer {
    type Target = PairSigner;

    fn deref(&self) -> &Self::Target {
        &self.signer
    }
}

impl std::ops::DerefMut for Signer {
    fn deref_mut(&mut self) -> &mut Self::Target {
        &mut self.signer
    }
}