use std::error::Error;
use std::fmt::{Display, Formatter};

#[derive(Debug)]
pub struct IllegalArgumentError {
    message: String,
}

// Eventually we'll want support for source position, so we can highlight which argument(s)
// are wrong
impl IllegalArgumentError {
    pub fn wrong_type(expected: &str, found: &str) -> Self {
        Self {
            message: format!("Expected {} but found {}", expected, found),
        }
    }

    pub fn wrong_number(expected: usize, found: usize) -> Self {
        Self {
            message: format!("Expected {} argument(s) but found {}", expected, found),
        }
    }
}

impl Display for IllegalArgumentError {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        write!(f, "IllegalArgumentError: {}", self.message)
    }
}

impl Error for IllegalArgumentError {}