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// Copyright (C) 2019-2020 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 crate::{
    curves::Field,
    gadgets::r1cs::{ConstraintSystem, Index, LinearCombination, Variable},
};
use snarkvm_errors::gadgets::SynthesisError;

/// Constraint counter for testing purposes.
#[derive(Default)]
pub struct ConstraintCounter {
    pub num_inputs: usize,
    pub num_aux: usize,
    pub num_constraints: usize,
}

impl ConstraintCounter {
    pub fn num_constraints(&self) -> usize {
        self.num_constraints
    }
}

impl<ConstraintF: Field> ConstraintSystem<ConstraintF> for ConstraintCounter {
    type Root = Self;

    fn alloc<F, A, AR>(&mut self, _: A, _: F) -> Result<Variable, SynthesisError>
    where
        F: FnOnce() -> Result<ConstraintF, SynthesisError>,
        A: FnOnce() -> AR,
        AR: AsRef<str>,
    {
        let var = Variable::new_unchecked(Index::Aux(self.num_aux));
        self.num_aux += 1;
        Ok(var)
    }

    fn alloc_input<F, A, AR>(&mut self, _: A, _: F) -> Result<Variable, SynthesisError>
    where
        F: FnOnce() -> Result<ConstraintF, SynthesisError>,
        A: FnOnce() -> AR,
        AR: AsRef<str>,
    {
        let var = Variable::new_unchecked(Index::Input(self.num_inputs));
        self.num_inputs += 1;

        Ok(var)
    }

    fn enforce<A, AR, LA, LB, LC>(&mut self, _: A, _: LA, _: LB, _: LC)
    where
        A: FnOnce() -> AR,
        AR: AsRef<str>,
        LA: FnOnce(LinearCombination<ConstraintF>) -> LinearCombination<ConstraintF>,
        LB: FnOnce(LinearCombination<ConstraintF>) -> LinearCombination<ConstraintF>,
        LC: FnOnce(LinearCombination<ConstraintF>) -> LinearCombination<ConstraintF>,
    {
        self.num_constraints += 1;
    }

    fn push_namespace<NR, N>(&mut self, _: N)
    where
        NR: AsRef<str>,
        N: FnOnce() -> NR,
    {
    }

    fn pop_namespace(&mut self) {}

    fn get_root(&mut self) -> &mut Self::Root {
        self
    }

    fn num_constraints(&self) -> usize {
        self.num_constraints
    }
}