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// Define a module for the calculator
mod calculator {
    // Function to add two numbers
    /// Adds one to the number given.
    ///
    /// # Examples
    ///
    /// ```
    /// let arg = 5;
    /// let answer = hellocalc::add(5.0,6.0);
    ///
    /// assert_eq!(11.0, answer);
    /// ```
    pub fn add(num1: f64, num2: f64) -> f64 {
        num1 + num2
    }

    // Function to subtract two numbers
    pub fn subtract(num1: f64, num2: f64) -> f64 {
        num1 - num2
    }

    // Function to multiply two numbers
    pub fn multiply(num1: f64, num2: f64) -> f64 {
        num1 * num2
    }

    // Function to divide two numbers
    pub fn divide(num1: f64, num2: f64) -> Result<f64, &'static str> {
        if num2 == 0.0 {
            panic!("Error: Division by zero");
            //Err("Division by zero")
        } else {
            Ok(num1 / num2)
        }
    }
}

// Export the functions for external use
pub use calculator::*;

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_add() {
        assert_eq!(add(3.0, 2.0), 5.0);
         assert_eq!(add(-3.0, 2.0), -1.0);
        assert_eq!(add(0.0, 0.0), 0.0);
    }

    #[test]
    // #[ignore]
    fn test_subtract() {
        assert_eq!(subtract(3.0, 2.0), 1.0);
        assert_eq!(subtract(-3.0, 2.0), -5.0);
        assert_eq!(subtract(0.0, 0.0), 0.0);
    }

    #[test]
    fn test_multiply() {
        assert_eq!(multiply(3.0, 2.0), 6.0);
        assert_eq!(multiply(-3.0, 2.0), -6.0);
        assert_eq!(multiply(0.0, 0.0), 0.0);
    }

    #[test]
    fn test_divide() {
        assert_eq!(divide(6.0, 2.0), Ok(3.0));
        // assert_eq!(divide(3.0, 0.0), Err("Error: Division by zero"));
    }

    #[test]
    #[should_panic]
    fn test_divide_by_zero_panics() {
        let _ = divide(6.0, 0.0);
    }
}