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// Copyright (C) 2019-2021 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 snarkvm_fields::Field;
use snarkvm_r1cs::{errors::SynthesisError, ConstraintSystem};

use crate::integers::uint::UInt8;

pub trait ToBytesGadget<F: Field> {
    fn to_bytes<CS: ConstraintSystem<F>>(&self, cs: CS) -> Result<Vec<UInt8>, SynthesisError>;

    /// Additionally checks if the produced list of booleans is 'valid'.
    fn to_bytes_strict<CS: ConstraintSystem<F>>(&self, cs: CS) -> Result<Vec<UInt8>, SynthesisError>;
}

impl<F: Field> ToBytesGadget<F> for [UInt8] {
    fn to_bytes<CS: ConstraintSystem<F>>(&self, _cs: CS) -> Result<Vec<UInt8>, SynthesisError> {
        Ok(self.to_vec())
    }

    fn to_bytes_strict<CS: ConstraintSystem<F>>(&self, cs: CS) -> Result<Vec<UInt8>, SynthesisError> {
        self.to_bytes(cs)
    }
}

impl<'a, F: Field, T: 'a + ToBytesGadget<F>> ToBytesGadget<F> for &'a T {
    fn to_bytes<CS: ConstraintSystem<F>>(&self, cs: CS) -> Result<Vec<UInt8>, SynthesisError> {
        (*self).to_bytes(cs)
    }

    fn to_bytes_strict<CS: ConstraintSystem<F>>(&self, cs: CS) -> Result<Vec<UInt8>, SynthesisError> {
        self.to_bytes(cs)
    }
}

impl<'a, F: Field> ToBytesGadget<F> for &'a [UInt8] {
    fn to_bytes<CS: ConstraintSystem<F>>(&self, _cs: CS) -> Result<Vec<UInt8>, SynthesisError> {
        Ok(self.to_vec())
    }

    fn to_bytes_strict<CS: ConstraintSystem<F>>(&self, cs: CS) -> Result<Vec<UInt8>, SynthesisError> {
        self.to_bytes(cs)
    }
}

impl<F: Field> ToBytesGadget<F> for Vec<UInt8> {
    fn to_bytes<CS: ConstraintSystem<F>>(&self, _cs: CS) -> Result<Vec<UInt8>, SynthesisError> {
        Ok(self.to_vec())
    }

    fn to_bytes_strict<CS: ConstraintSystem<F>>(&self, cs: CS) -> Result<Vec<UInt8>, SynthesisError> {
        self.to_bytes(cs)
    }
}