use std::{
    fmt::{self, Display},
    fs::read_to_string,
};

pub fn run(arg: &str) -> String {
    let content = read_to_string(arg).unwrap();
    let result = interpret(&content.to_string());

    result.to_string()
}

#[derive(Debug, PartialEq)]
pub enum Value {
    Num(i32),
}

impl Display for Value {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            Value::Num(i) => write!(f, "{}", i),
        }
    }
}

fn interpret(_arg: &str) -> Value {
    Value::Num(1)
}

#[cfg(test)]
mod tests {
    use super::interpret;
    use super::Value::Num;

    #[test]
    fn it_works() {
        let result = interpret("1");
        assert_eq!(Num(1), result);
    }
}