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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/>.

//! Enforce a function call expression in a compiled Leo program.

use crate::{errors::ExpressionError, program::ConstrainedProgram, value::ConstrainedValue, GroupType};
use leo_asg::{Expression, Function, Span};
use std::sync::Arc;

use snarkvm_models::{
    curves::{Field, PrimeField},
    gadgets::r1cs::ConstraintSystem,
};

impl<F: Field + PrimeField, G: GroupType<F>> ConstrainedProgram<F, G> {
    #[allow(clippy::too_many_arguments)]
    pub fn enforce_function_call_expression<CS: ConstraintSystem<F>>(
        &mut self,
        cs: &mut CS,
        function: &Arc<Function>,
        target: Option<&Arc<Expression>>,
        arguments: &[Arc<Expression>],
        span: &Span,
    ) -> Result<ConstrainedValue<F, G>, ExpressionError> {
        let name_unique = || {
            format!(
                "function call {} {}:{}",
                function.name.borrow().clone(),
                span.line,
                span.start,
            )
        };
        let function = function
            .body
            .borrow()
            .upgrade()
            .expect("stale function in call expression");

        let return_value = self
            .enforce_function(&mut cs.ns(name_unique), &function, target, arguments)
            .map_err(|error| ExpressionError::from(Box::new(error)))?;

        Ok(return_value)
    }
}