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// Copyright (C) 2019-2022 Aleo Systems Inc.
// This file is part of the snarkVM library.

// The snarkVM library is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// The snarkVM library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with the snarkVM library. If not, see <https://www.gnu.org/licenses/>.

use super::*;

impl<N: Network> FromBytes for Value<N> {
    /// Reads the entry from a buffer.
    fn read_le<R: Read>(mut reader: R) -> IoResult<Self> {
        // Read the index.
        let index = u8::read_le(&mut reader)?;
        // Read the entry.
        let entry = match index {
            0 => Self::Plaintext(Plaintext::read_le(&mut reader)?),
            1 => Self::Record(Record::read_le(&mut reader)?),
            2.. => return Err(error(format!("Failed to decode value variant {index}"))),
        };
        Ok(entry)
    }
}

impl<N: Network> ToBytes for Value<N> {
    /// Writes the entry to a buffer.
    fn write_le<W: Write>(&self, mut writer: W) -> IoResult<()> {
        match self {
            Self::Plaintext(plaintext) => {
                0u8.write_le(&mut writer)?;
                plaintext.write_le(&mut writer)
            }
            Self::Record(record) => {
                1u8.write_le(&mut writer)?;
                record.write_le(&mut writer)
            }
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use snarkvm_console_network::Testnet3;

    type CurrentNetwork = Testnet3;

    #[test]
    fn test_value_plaintext_bytes() -> Result<()> {
        // Construct a new plaintext value.
        let expected = Value::Plaintext(Plaintext::<CurrentNetwork>::from_str(
            "{ owner: aleo1d5hg2z3ma00382pngntdp68e74zv54jdxy249qhaujhks9c72yrs33ddah, gates: 5u64, token_amount: 100u64 }",
        )?);

        // Check the byte representation.
        let expected_bytes = expected.to_bytes_le()?;
        assert_eq!(expected, Value::read_le(&expected_bytes[..])?);
        assert!(Value::<CurrentNetwork>::read_le(&expected_bytes[1..]).is_err());
        Ok(())
    }

    #[test]
    fn test_value_record_bytes() -> Result<()> {
        // Construct a new record value.
        let expected = Value::Record(Record::<CurrentNetwork, Plaintext<CurrentNetwork>>::from_str(
            "{ owner: aleo1d5hg2z3ma00382pngntdp68e74zv54jdxy249qhaujhks9c72yrs33ddah.private, gates: 5u64.private, token_amount: 100u64.private, _nonce: 0group.public }",
        )?);

        // Check the byte representation.
        let expected_bytes = expected.to_bytes_le()?;
        assert_eq!(expected, Value::read_le(&expected_bytes[..])?);
        assert!(Value::<CurrentNetwork>::read_le(&expected_bytes[1..]).is_err());
        Ok(())
    }
}