// Copyright 2022 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

use std::fmt::Debug;

use tracing::instrument;

use crate::piv::slot::SlotObject;
use native_pkcs11_traits::Result as P11Result;
use native_pkcs11_traits::{Backend, KeyAlgorithm, PrivateKey, PublicKey, SignatureAlgorithm};

#[derive(Debug)]
pub enum Algorithm {
    RSA,
    ECC,
}

#[derive(Debug)]
pub struct YubikeyPivPrivateKey {
    slot_object: SlotObject,
}

impl YubikeyPivPrivateKey {
    #[instrument]
    pub fn new(slot_object: SlotObject) -> P11Result<Self> {
        Ok(YubikeyPivPrivateKey {
            slot_object,
        })
    }
}

impl PrivateKey for YubikeyPivPrivateKey {
    #[instrument]
    fn public_key_hash(&self) -> Vec<u8> {
        self.slot_object.public_key_hash.clone()
    }

    #[instrument]
    fn label(&self) -> String {
        self.slot_object.label.clone()
    }

    #[instrument]
    fn sign(
        &self,
        algorithm: &SignatureAlgorithm,
        data: &[u8],
    ) -> P11Result<Vec<u8>> {
        println!(">> CALL: sign");
        match algorithm {
            SignatureAlgorithm::Ecdsa => {}
            _ => return Err("RSA algorithm not supported.")?,
        }
        // TODO sign data or hash??
        Ok(vec![])
    }

    #[instrument]
    fn delete(&self) {
        // TODO ... yubikey-piv-pkcs11 just cannot delete private key
    }

    #[instrument]
    fn algorithm(&self) -> KeyAlgorithm {
        self.slot_object.algorithm
    }

    fn find_public_key(
        &self,
        _backend: &dyn Backend,
    ) -> P11Result<Option<Box<dyn PublicKey>>> {
        // TODO ...
        Ok(None)
    }
}

#[derive(Debug, Clone)]
pub struct YubikeyPivPublicKey {
    slot_object: SlotObject,
}

impl YubikeyPivPublicKey {
    #[instrument]
    pub fn new(slot_object: SlotObject) -> P11Result<Self> {
        Ok(YubikeyPivPublicKey {
            slot_object,
        })
    }
}

impl PublicKey for YubikeyPivPublicKey {
    #[instrument]
    fn public_key_hash(&self) -> Vec<u8> {
        self.slot_object.public_key_hash.clone()
    }

    #[instrument]
    fn label(&self) -> String {
        self.slot_object.label.clone()
    }

    #[instrument]
    fn to_der(&self) -> Vec<u8> {
        self.slot_object.public_key_der.clone()
    }

    #[instrument]
    fn verify(
        &self,
        algorithm: &SignatureAlgorithm,
        data: &[u8],
        signature: &[u8],
    ) -> P11Result<()> {
        println!(">> CALL: verify");
        match algorithm {
            SignatureAlgorithm::Ecdsa => {}
            _ => return Err("RSA algorithm not supported.")?,
        }
        // let result = self.sec_key.verify_signature(algorithm, data, signature)?;
        // if !result {
        //     return Err("verify failed")?;
        // }
        // TODO ...
        Ok(())
    }

    fn delete(self: Box<Self>) {
        // yubikey-piv-pkcs11 just cannot delete public key
    }

    fn algorithm(&self) -> KeyAlgorithm {
        self.slot_object.algorithm
    }
}