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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 Execution<N> {
    /// Reads the execution 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 execution version"));
        }
        // Read the edition.
        let edition = u16::read_le(&mut reader)?;
        // Read the number of transitions.
        let num_transitions = u16::read_le(&mut reader)?;
        // Ensure the number of transitions is nonzero.
        if num_transitions == 0 {
            warn!("Execution (from 'read_le') has no transitions");
            return Err(error("Execution (from 'read_le') has no transitions"));
        }
        // Read the transitions.
        let transitions =
            (0..num_transitions).map(|_| Transition::read_le(&mut reader)).collect::<IoResult<Vec<_>>>()?;
        // Return the new `Execution` instance.
        Self::from(edition, &transitions).map_err(|e| error(e.to_string()))
    }
}

impl<N: Network> ToBytes for Execution<N> {
    /// Writes the execution 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 number of transitions.
        (self.transitions.len() as u16).write_le(&mut writer)?;
        // Write the transitions.
        self.transitions.write_le(&mut writer)
    }
}

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

    type CurrentNetwork = Testnet3;

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

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