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// Copyright (C) 2019-2021 Aleo Systems Inc.
// This file is part of the Leo library.

// The Leo 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 Leo 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 Leo library. If not, see <https://www.gnu.org/licenses/>.

//! Enforces a logical `!` operator in a resolved Leo program.

use crate::{errors::BooleanError, value::ConstrainedValue, GroupType};
use leo_asg::Span;

use snarkvm_models::curves::{Field, PrimeField};

pub fn evaluate_not<F: Field + PrimeField, G: GroupType<F>>(
    value: ConstrainedValue<F, G>,
    span: &Span,
) -> Result<ConstrainedValue<F, G>, BooleanError> {
    match value {
        ConstrainedValue::Boolean(boolean) => Ok(ConstrainedValue::Boolean(boolean.not())),
        value => Err(BooleanError::cannot_evaluate(format!("!{}", value), span.clone())),
    }
}