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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, const NUM_WINDOWS: u8, const WINDOW_SIZE: u8> CommitUncompressed
    for BHP<E, NUM_WINDOWS, WINDOW_SIZE>
{
    type Input = Boolean<E>;
    type Output = Group<E>;
    type Randomizer = Scalar<E>;

    /// Returns the BHP commitment of the given input and randomizer as an affine group element.
    fn commit_uncompressed(&self, input: &[Self::Input], randomizer: &Self::Randomizer) -> Self::Output {
        let hash = self.hash_uncompressed(input);

        // Compute h^r.
        randomizer
            .to_bits_le()
            .iter()
            .zip_eq(self.hasher.random_base())
            .map(|(bit, power)| Group::ternary(bit, power, &Group::zero()))
            .fold(hash, |acc, x| acc + x)
    }
}

#[cfg(all(test, console))]
mod tests {
    use super::*;
    use snarkvm_circuit_types::environment::Circuit;
    use snarkvm_utilities::{test_rng, Uniform};

    use anyhow::Result;

    const ITERATIONS: u64 = 100;
    const DOMAIN: &str = "BHPCircuit0";

    fn check_commit_uncompressed<const NUM_WINDOWS: u8, const WINDOW_SIZE: u8>(
        mode: Mode,
        num_constants: u64,
        num_public: u64,
        num_private: u64,
        num_constraints: u64,
    ) -> Result<()> {
        use console::CommitUncompressed as C;

        // Initialize BHP.
        let native = console::BHP::<<Circuit as Environment>::Network, NUM_WINDOWS, WINDOW_SIZE>::setup(DOMAIN)?;
        let circuit = BHP::<Circuit, NUM_WINDOWS, WINDOW_SIZE>::new(Mode::Constant, native.clone());
        // Determine the number of inputs.
        let num_input_bits = NUM_WINDOWS as usize * WINDOW_SIZE as usize * BHP_CHUNK_SIZE;

        for i in 0..ITERATIONS {
            // Sample a random input.
            let input = (0..num_input_bits).map(|_| bool::rand(&mut test_rng())).collect::<Vec<bool>>();
            // Sample a randomizer.
            let randomizer = Uniform::rand(&mut test_rng());
            // Compute the expected commitment.
            let expected = native.commit_uncompressed(&input, &randomizer).expect("Failed to commit native input");
            // Prepare the circuit input.
            let circuit_input: Vec<Boolean<_>> = Inject::new(mode, input);
            // Prepare the circuit randomizer.
            let circuit_randomizer: Scalar<_> = Inject::new(mode, randomizer);

            Circuit::scope(format!("BHP {mode} {i}"), || {
                // Perform the hash operation.
                let candidate = circuit.commit_uncompressed(&circuit_input, &circuit_randomizer);
                assert_scope!(<=num_constants, num_public, num_private, num_constraints);
                assert_eq!(expected, candidate.eject_value());
            });
            Circuit::reset();
        }
        Ok(())
    }

    #[test]
    fn test_commit_uncompressed_constant() -> Result<()> {
        check_commit_uncompressed::<32, 48>(Mode::Constant, 8200, 0, 0, 0)
    }

    #[test]
    fn test_commit_uncompressed_public() -> Result<()> {
        check_commit_uncompressed::<32, 48>(Mode::Public, 1044, 0, 10419, 10491)
    }

    #[test]
    fn test_commit_uncompressed_private() -> Result<()> {
        check_commit_uncompressed::<32, 48>(Mode::Private, 1044, 0, 10419, 10491)
    }
}