mod tests;

use crate::ast::Node;

// fn cancel_double_negation(ast: Node<char>) {
//     let mut new_ast = ast.clone();

//     fn recursion(ast: &mut Node<char>, node_count: usize) {
//         match ast {
//             Node::Unary { operator: _, operand } => {
//                 recursion(&mut *operand, node_count + 1);
//             },
//             Node::Binary { operator: _, lhs, rhs } => {
//                 recursion(&mut *lhs, node_count + 1);
//                 recursion(&mut *rhs, node_count + 1);
//             },
//             Node::Leaf(c) => (),
//         }
//     }

//     recursion(&mut new_ast, 0);

//     new_ast
// }

fn negation_normal_form(formula: &str) -> String {
    let ast = Node::<char>::parse_formula(formula);

    Node::<char>::ast_to_formula(ast)
}