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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};

#[derive(Clone, Copy, Debug, Hash, PartialEq, Eq, PartialOrd, Ord, Deserialize, Serialize)]
#[allow(non_camel_case_types)]
pub enum ProofAlgorithm {

  ///TODO: we need two algorithms (BLS12381_SHA256 and BLS12381_SHAKE256) 
  /// We should also distinguish between the BBS algorithm standard and the one extended
  #[serde(rename = "BBS-BLS12381-SHA256")]
  BLS12381_SHA256,
  #[serde(rename = "BBS-BLS12381-SHAKE256")]
  BLS12381_SHAKE256,

  #[serde(rename = "BBS-BLS12381-SHA256-PROOF")]
  BLS12381_SHA256_PROOF,
  #[serde(rename = "BBS-BLS12381-SHAKE256-PROOF")]
  BLS12381_SHAKE256_PROOF,

  #[serde(rename = "SU-ES256")]
  SU_ES256,
  #[serde(rename = "MAC-H256")]
  MAC_H256,
  #[serde(rename = "MAC-H384")]
  MAC_H384,
  #[serde(rename = "MAC-H512")]
  MAC_H512,
  #[serde(rename = "MAC-K25519")]
  MAC_K25519,
  #[serde(rename = "MAC-K448")]
  MAC_K448,
  #[serde(rename = "MAC-H256K")]
  MAC_H256K
}


impl fmt::Display for ProofAlgorithm {
  fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
      let variant_str = match self {
          ProofAlgorithm::BLS12381_SHA256 => "BLS12381_SHA256",
          ProofAlgorithm::BLS12381_SHAKE256 => "BLS12381_SHAKE256",
          ProofAlgorithm::BLS12381_SHA256_PROOF => "BLS12381_SHA256_PROOF",
          ProofAlgorithm::BLS12381_SHAKE256_PROOF => "BLS12381_SHAKE256_PROOF",
          ProofAlgorithm::SU_ES256 => "SU_ES256",
          ProofAlgorithm::MAC_H256 => "MAC_H256",
          ProofAlgorithm::MAC_H384 => "MAC_H384",
          ProofAlgorithm::MAC_H512 => "MAC_H512",
          ProofAlgorithm::MAC_K25519 => "MAC_K25519",
          ProofAlgorithm::MAC_K448 => "MAC_K448",
          ProofAlgorithm::MAC_H256K => "MAC_H256K",
      };
      write!(f, "{}", variant_str)
  }
}




// pub trait ProofGenerator {
//   fn generate_issuer_proof(&self) -> Option<Vec<u8>>;
//   fn generate_presentaiton_proof(&self) -> Option<Vec<u8>>;
// }