// Copyright (C) 2019-2026 Provable 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/>.

use crate::{Expression, Node, NodeID, Statement};

use leo_span::Span;

use serde::{Deserialize, Serialize};
use std::fmt;

/// A return statement `return expression;`.
#[derive(Clone, PartialEq, Eq, Serialize, Deserialize, Debug)]
pub struct ReturnStatement {
    /// The expression to return to the function caller.
    pub expression: Expression,
    /// The span of `return expression` excluding the semicolon.
    pub span: Span,
    /// The ID of the node.
    pub id: NodeID,
}

impl fmt::Display for ReturnStatement {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        if let Expression::Unit(..) = self.expression {
            write!(f, "return")
        } else {
            write!(f, "return {}", self.expression)
        }
    }
}

impl From<ReturnStatement> for Statement {
    fn from(value: ReturnStatement) -> Self {
        Statement::Return(value)
    }
}

crate::simple_node_impl!(ReturnStatement);
