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use crate::software_vault::SoftwareVault;
use crate::xeddsa::XEddsaSigner;
use crate::VaultError;
use arrayref::array_ref;
use ockam_vault_core::{Secret, SecretType, Signer, CURVE25519_SECRET_LENGTH};
use rand::{thread_rng, RngCore};

impl Signer for SoftwareVault {
    /// Sign data with xeddsa algorithm. Only curve25519 is supported.
    fn sign(&mut self, secret_key: &Secret, data: &[u8]) -> ockam_core::Result<[u8; 64]> {
        let entry = self.get_entry(secret_key)?;
        let key = entry.key().as_ref();
        match entry.key_attributes().stype() {
            SecretType::Curve25519 if key.len() == CURVE25519_SECRET_LENGTH => {
                let mut rng = thread_rng();
                let mut nonce = [0u8; 64];
                rng.fill_bytes(&mut nonce);
                let sig =
                    x25519_dalek::StaticSecret::from(*array_ref!(key, 0, CURVE25519_SECRET_LENGTH))
                        .sign(data.as_ref(), &nonce);
                Ok(sig)
            }
            _ => Err(VaultError::InvalidKeyType.into()),
        }
    }
}

#[cfg(test)]
mod tests {
    use crate::SoftwareVault;
    use ockam_vault_core::{
        SecretAttributes, SecretPersistence, SecretType, SecretVault, Signer, Verifier,
        CURVE25519_SECRET_LENGTH,
    };

    #[test]
    fn sign() {
        let mut vault = SoftwareVault::default();
        let secret = vault
            .secret_generate(SecretAttributes::new(
                SecretType::Curve25519,
                SecretPersistence::Ephemeral,
                CURVE25519_SECRET_LENGTH,
            ))
            .unwrap();
        let res = vault.sign(&secret, b"hello world!");
        assert!(res.is_ok());
        let pubkey = vault.secret_public_key_get(&secret).unwrap();
        let signature = res.unwrap();
        let res = vault.verify(&signature, pubkey.as_ref(), b"hello world!");
        assert!(res.is_ok());
    }
}