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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<E: Environment, I: IntegerType> ToBits for Integer<E, I> {
    /// Outputs the little-endian bit representation of `self` *without* trailing zeros.
    fn to_bits_le(&self) -> Vec<bool> {
        (**self).to_bits_le()
    }

    /// Outputs the big-endian bit representation of `self` *without* leading zeros.
    fn to_bits_be(&self) -> Vec<bool> {
        (**self).to_bits_be()
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use snarkvm_console_network_environment::Console;

    type CurrentEnvironment = Console;

    const ITERATIONS: u64 = 10_000;

    fn check_to_bits_le<I: IntegerType>(rng: &mut TestRng) {
        for _ in 0..ITERATIONS {
            // Sample a random value.
            let integer: Integer<CurrentEnvironment, I> = Uniform::rand(rng);

            let candidate = integer.to_bits_le();
            assert_eq!(Integer::<CurrentEnvironment, I>::size_in_bits(), candidate.len());

            for (expected, candidate) in (*integer).to_bits_le().iter().zip_eq(&candidate) {
                assert_eq!(expected, candidate);
            }
        }
    }

    fn check_to_bits_be<I: IntegerType>(rng: &mut TestRng) {
        for _ in 0..ITERATIONS {
            // Sample a random value.
            let integer: Integer<CurrentEnvironment, I> = Uniform::rand(rng);

            let candidate = integer.to_bits_be();
            assert_eq!(Integer::<CurrentEnvironment, I>::size_in_bits(), candidate.len());

            for (expected, candidate) in (*integer).to_bits_be().iter().zip_eq(&candidate) {
                assert_eq!(expected, candidate);
            }
        }
    }

    #[test]
    fn test_to_bits_le() {
        let mut rng = TestRng::default();

        check_to_bits_le::<u8>(&mut rng);
        check_to_bits_le::<u16>(&mut rng);
        check_to_bits_le::<u32>(&mut rng);
        check_to_bits_le::<u64>(&mut rng);
        check_to_bits_le::<u128>(&mut rng);

        check_to_bits_le::<i8>(&mut rng);
        check_to_bits_le::<i16>(&mut rng);
        check_to_bits_le::<i32>(&mut rng);
        check_to_bits_le::<i64>(&mut rng);
        check_to_bits_le::<i128>(&mut rng);
    }

    #[test]
    fn test_to_bits_be() {
        let mut rng = TestRng::default();

        check_to_bits_be::<u8>(&mut rng);
        check_to_bits_be::<u16>(&mut rng);
        check_to_bits_be::<u32>(&mut rng);
        check_to_bits_be::<u64>(&mut rng);
        check_to_bits_be::<u128>(&mut rng);

        check_to_bits_be::<i8>(&mut rng);
        check_to_bits_be::<i16>(&mut rng);
        check_to_bits_be::<i32>(&mut rng);
        check_to_bits_be::<i64>(&mut rng);
        check_to_bits_be::<i128>(&mut rng);
    }
}