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// Copyright (C) 2019-2023 Aleo Systems Inc.
// This file is part of the snarkVM library.

// 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 super::*;

impl<N: Network> Serialize for BatchCertificate<N> {
    /// Serializes the batch certificate to a JSON-string or buffer.
    fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
        match serializer.is_human_readable() {
            true => match self {
                Self::V1 { certificate_id, batch_header, signatures } => {
                    let mut state = serializer.serialize_struct("BatchCertificate", 3)?;
                    state.serialize_field("certificate_id", certificate_id)?;
                    state.serialize_field("batch_header", batch_header)?;
                    state.serialize_field("signatures", signatures)?;
                    state.end()
                }
                Self::V2 { batch_header, signatures } => {
                    let mut state = serializer.serialize_struct("BatchCertificate", 2)?;
                    state.serialize_field("batch_header", batch_header)?;
                    state.serialize_field("signatures", signatures)?;
                    state.end()
                }
            },
            false => ToBytesSerializer::serialize_with_size_encoding(self, serializer),
        }
    }
}

impl<'de, N: Network> Deserialize<'de> for BatchCertificate<N> {
    /// Deserializes the batch certificate from a JSON-string or buffer.
    fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error> {
        match deserializer.is_human_readable() {
            true => {
                let mut value = serde_json::Value::deserialize(deserializer)?;

                // Check if a certificate ID field is present.
                let certificate_id = match value.get("certificate_id") {
                    Some(..) => Some(DeserializeExt::take_from_value::<D>(&mut value, "certificate_id")?),
                    None => None,
                };

                // Parse for V1 and V2 batch certificates.
                if let Some(certificate_id) = certificate_id {
                    Self::from_v1_deprecated(
                        certificate_id,
                        DeserializeExt::take_from_value::<D>(&mut value, "batch_header")?,
                        DeserializeExt::take_from_value::<D>(&mut value, "signatures")?,
                    )
                    .map_err(de::Error::custom)
                } else {
                    Self::from(
                        DeserializeExt::take_from_value::<D>(&mut value, "batch_header")?,
                        DeserializeExt::take_from_value::<D>(&mut value, "signatures")?,
                    )
                    .map_err(de::Error::custom)
                }
            }
            false => FromBytesDeserializer::<Self>::deserialize_with_size_encoding(deserializer, "batch certificate"),
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    fn check_serde_json<
        T: Serialize + for<'a> Deserialize<'a> + Debug + Display + PartialEq + Eq + FromStr + ToBytes + FromBytes,
    >(
        expected: T,
    ) {
        // Serialize
        let expected_string = expected.to_string();
        let candidate_string = serde_json::to_string(&expected).unwrap();
        let candidate = serde_json::from_str::<T>(&candidate_string).unwrap();
        assert_eq!(expected, candidate);
        assert_eq!(expected_string, candidate_string);
        assert_eq!(expected_string, candidate.to_string());

        // Deserialize
        assert_eq!(expected, T::from_str(&expected_string).unwrap_or_else(|_| panic!("FromStr: {expected_string}")));
        assert_eq!(expected, serde_json::from_str(&candidate_string).unwrap());
    }

    fn check_bincode<
        T: Serialize + for<'a> Deserialize<'a> + Debug + Display + PartialEq + Eq + FromStr + ToBytes + FromBytes,
    >(
        expected: T,
    ) {
        // Serialize
        let expected_bytes = expected.to_bytes_le().unwrap();
        let expected_bytes_with_size_encoding = bincode::serialize(&expected).unwrap();
        assert_eq!(&expected_bytes[..], &expected_bytes_with_size_encoding[8..]);

        // Deserialize
        assert_eq!(expected, T::read_le(&expected_bytes[..]).unwrap());
        assert_eq!(expected, bincode::deserialize(&expected_bytes_with_size_encoding[..]).unwrap());
    }

    #[test]
    fn test_serde_json() {
        let rng = &mut TestRng::default();

        for expected in crate::test_helpers::sample_batch_certificates(rng) {
            check_serde_json(expected);
        }
    }

    #[test]
    fn test_bincode() {
        let rng = &mut TestRng::default();

        for expected in crate::test_helpers::sample_batch_certificates(rng) {
            check_bincode(expected);
        }
    }
}