use algebra_core::Field;
use core::fmt::Debug;

use crate::crh::FixedLengthCRH;
use r1cs_core::SynthesisError;

use r1cs_std::prelude::*;

pub trait FixedLengthCRHGadget<H: FixedLengthCRH, ConstraintF: Field>: Sized {
    type OutputVar: EqGadget<ConstraintF>
        + ToBytesGadget<ConstraintF>
        + CondSelectGadget<ConstraintF>
        + AllocVar<H::Output, ConstraintF>
        + R1CSVar<ConstraintF>
        + Debug
        + Clone
        + Sized;

    type ParametersVar: AllocVar<H::Parameters, ConstraintF> + Clone;

    fn evaluate(
        parameters: &Self::ParametersVar,
        input: &[UInt8<ConstraintF>],
    ) -> Result<Self::OutputVar, SynthesisError>;
}