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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 Deployment<N> {
    /// Reads the deployment from a buffer.
    fn read_le<R: Read>(mut reader: R) -> IoResult<Self> {
        // Read the version.
        let version = u16::read_le(&mut reader)?;
        // Ensure the version is valid.
        if version != 0 {
            return Err(error("Invalid deployment version"));
        }

        // Read the edition.
        let edition = u16::read_le(&mut reader)?;
        // Read the program.
        let program = Program::read_le(&mut reader)?;

        // Read the number of entries in the bundle.
        let num_entries = u16::read_le(&mut reader)?;
        // Read the bundle.
        let mut bundle = IndexMap::with_capacity(num_entries as usize);
        for _ in 0..num_entries {
            // Read the identifier.
            let identifier = Identifier::<N>::read_le(&mut reader)?;
            // Read the verifying key.
            let verifying_key = VerifyingKey::<N>::read_le(&mut reader)?;
            // Read the certificate.
            let certificate = Certificate::<N>::read_le(&mut reader)?;
            // Add the entry.
            bundle.insert(identifier, (verifying_key, certificate));
        }

        Ok(Self { edition, program, verifying_keys: bundle })
    }
}

impl<N: Network> ToBytes for Deployment<N> {
    /// Writes the deployment to a buffer.
    fn write_le<W: Write>(&self, mut writer: W) -> IoResult<()> {
        // Write the version.
        0u16.write_le(&mut writer)?;
        // Write the edition.
        self.edition.write_le(&mut writer)?;
        // Write the program.
        self.program.write_le(&mut writer)?;
        // Write the number of entries in the bundle.
        (self.verifying_keys.len() as u16).write_le(&mut writer)?;
        // Write each entry.
        for (function_name, (verifying_key, certificate)) in &self.verifying_keys {
            // Write the function name.
            function_name.write_le(&mut writer)?;
            // Write the verifying key.
            verifying_key.write_le(&mut writer)?;
            // Write the certificate.
            certificate.write_le(&mut writer)?;
        }
        Ok(())
    }
}

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

    type CurrentNetwork = Testnet3;

    #[test]
    fn test_bytes() -> Result<()> {
        // Construct a new deployment.
        let expected = test_helpers::sample_deployment();

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