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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 GraphKey<N> {
    /// Reads an account graph key from a buffer.
    #[inline]
    fn read_le<R: Read>(mut reader: R) -> IoResult<Self> {
        let sk_tag = Field::<N>::read_le(&mut reader).map_err(|e| error(format!("{e}")))?;
        Self::try_from(sk_tag).map_err(|e| error(format!("{e}")))
    }
}

impl<N: Network> ToBytes for GraphKey<N> {
    /// Writes an account graph key to a buffer.
    fn write_le<W: Write>(&self, mut writer: W) -> IoResult<()> {
        self.sk_tag.write_le(&mut writer)
    }
}

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

    type CurrentNetwork = Testnet3;

    const ITERATIONS: u64 = 1000;

    #[test]
    fn test_bytes() -> Result<()> {
        let mut rng = TestRng::default();

        for _ in 0..ITERATIONS {
            // Sample a new graph key.
            let private_key = PrivateKey::<CurrentNetwork>::new(&mut rng)?;
            let view_key = ViewKey::try_from(private_key)?;
            let expected = GraphKey::try_from(view_key)?;

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