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use rand::{ Rng, CryptoRng };
use dilithium::{ params, sign };
use crate::{ Packing, Error };
use super::{ Signature, DeterministicSignature };


pub struct Dilithium;
pub struct PrivateKey([u8; params::SECRETKEYBYTES]);
pub struct PublicKey([u8; params::PUBLICKEYBYTES]);
pub struct SignatureData([u8; params::BYTES]);

impl Signature for Dilithium {
    type PrivateKey = PrivateKey;
    type PublicKey = PublicKey;
    type Signature = SignatureData;

    fn keypair<R: Rng + CryptoRng>(mut r: R) -> (Self::PrivateKey, Self::PublicKey) {
        let mut sk = [0; params::SECRETKEYBYTES];
        let mut pk = [0; params::PUBLICKEYBYTES];
        sign::keypair(&mut r, &mut pk, &mut sk);
        (PrivateKey(sk), PublicKey(pk))
    }

    fn signature<R: Rng + CryptoRng>(_: R, sk: &Self::PrivateKey, data: &[u8]) -> Self::Signature {
        <Dilithium as DeterministicSignature>::signature(sk, data)
    }

    fn verify(
        &PublicKey(ref pk): &Self::PublicKey,
        &SignatureData(ref sig): &Self::Signature,
        data: &[u8]
    ) -> Result<(), Error> {
        if sign::verify(data, sig, pk) {
            Ok(())
        } else {
            Err(Error::VerificationFailed)
        }
    }
}

impl DeterministicSignature for Dilithium {
    fn signature(&PrivateKey(ref sk): &Self::PrivateKey, data: &[u8]) -> Self::Signature {
        let mut sig = [0; params::BYTES];
        sign::sign(&mut sig, data, &sk);
        SignatureData(sig)
    }
}

eq!(PrivateKey);
eq!(PublicKey);
eq!(SignatureData);
packing!(PrivateKey; params::SECRETKEYBYTES);
packing!(PublicKey; params::PUBLICKEYBYTES);
packing!(SignatureData; params::BYTES);

#[cfg(feature = "serde")]
mod serde {
    use std::fmt;
    use serde::{
        Serialize, Serializer, Deserialize, Deserializer,
        de::{ self, Visitor }
    };
    use super::*;

    serde!(PrivateKey);
    serde!(PublicKey);
    serde!(SignatureData);
}