use std::rc::Rc;

use super::{Environment, Node, Precedence};

pub type ConstantValue = f64;

#[derive(Clone, Debug, PartialEq, PartialOrd)]
pub struct Constant {
    value: ConstantValue,
}

impl Node for Constant {
    fn evaluate(&self, _: &mut super::Environment) -> Result<Rc<super::NodeEnum>, String> {
        Ok(Rc::new(self.clone().into()))
    }

    fn as_string(&self, _env: Option<&Environment>) -> String {
        self.value.to_string()
    }

    fn precedence(&self) -> Precedence {
        Precedence::Primary
    }
}

impl Constant {
    pub fn new(value: ConstantValue) -> Self {
        Self { value }
    }

    pub fn get_value(&self) -> ConstantValue {
        self.value
    }

    pub fn set_value(&mut self, value: ConstantValue) {
        self.value = value;
    }
}