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// Copyright 2023 Fondazione LINKS

// 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;
use serde::{Deserialize, Serialize};
use crate::{jpa::algs::ProofAlgorithm, encoding::base64url_encode};

use super::{types::KeyType, curves::EllipticCurveTypes};

#[derive(Clone, Copy, Debug, Hash, PartialEq, Eq, PartialOrd, Ord, Deserialize, Serialize)]
#[serde(untagged)]
pub enum Algorithm {
    Proof(ProofAlgorithm),

    // These are defined in the JWA rfc
    
    // Signature(SignatureAlgorithm), https://datatracker.ietf.org/doc/html/rfc7518#section-3
    // KeyManagement(KeyManagementAlgorithm), https://datatracker.ietf.org/doc/html/rfc7518#section-4
    // Encryption(EncryptionAlgorithm), https://datatracker.ietf.org/doc/html/rfc7518#section-5
}

impl fmt::Display for Algorithm {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            Algorithm::Proof(proof_algorithm) => write!(f, "{}", proof_algorithm),
        }
    }
}

#[derive(Clone, Debug, PartialEq, Eq, Deserialize, Serialize)]
#[serde(untagged)]
pub enum JwkAlgorithmParameters {
    // TODO: to be done
    
    // EllipticCurve(JwkEllipticCurveKeyParameters),
    // RSA(JwkRSAKeyParameters),
    // OctetKey(JwkOctetKeyParameters),
    OctetKeyPair(JwkOctetKeyPairParameters),
}

impl JwkAlgorithmParameters {
    pub fn to_public(&self) -> Option<Self> {
        match self {
          Self::OctetKeyPair(inner) => Some(Self::OctetKeyPair(inner.to_public())),
        }
    }
    

    pub fn is_public(&self) -> bool {
        match self {
            Self::OctetKeyPair(value) => value.is_public(),
        }
    }

    pub fn is_private(&self) -> bool {
        match self {
            Self::OctetKeyPair(value) => value.is_private(),
        }
    }
}



/// For know thir implementation refers to this: https://www.rfc-editor.org/rfc/rfc8037.html
/// But later could be changed to this: https://datatracker.ietf.org/doc/html/draft-ietf-cose-bls-key-representations-03
#[derive(Clone, Debug, PartialEq, Eq, Deserialize, Serialize)]
pub struct JwkOctetKeyPairParameters {
    pub kty: KeyType, 
    /// The "crv" (curve) parameter identifies the cryptographic curve used
    /// with the key.
    pub crv: EllipticCurveTypes,
    /// The "x" parameter contains the base64url encoded public key
    pub x: String,
    /// The "d" parameter contains the base64url encoded private key
    #[serde(skip_serializing_if = "Option::is_none")]
    pub d: Option<String>,
}

impl JwkOctetKeyPairParameters {

    pub fn new<T: AsRef<[u8]>>(crv: EllipticCurveTypes, x: T, d: Option<T> ) -> Self{

        Self{
            kty: KeyType::OctetKeyPair,
            crv: crv,
            x: base64url_encode(x),
            d: match d {
                Some(d) => Some(base64url_encode(d)),
                None => None
            }
        }

    }

    /// Returns a clone without private key.
    pub fn to_public(&self) -> Self {
        Self {
            kty: KeyType::OctetKeyPair,
            crv: self.crv.clone(),
            x: self.x.clone(),
            d: None,
        }
    }

    /// Returns `true` if _all_ private key components of the key are unset, `false` otherwise.
    pub fn is_public(&self) -> bool {
        self.d.is_none()
    }

    /// Returns `true` if _all_ private key components of the key are set, `false` otherwise.
    pub fn is_private(&self) -> bool {
        self.d.is_some()
    }
}