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/// Assert one function ok() is not equal to another function ok().
///
/// * When true, return `Ok(())`.
///
/// * Otherwise, return [`Err`] with a message and the values of the
///   expressions with their debug representations.
///
/// # Examples
///
/// ```rust
/// # #[macro_use] extern crate assertables;
/// use std::str::FromStr;
/// # fn main() {
/// let x = assertable_f_ok_ge!(i32::from_str, "2", "1");
/// //-> Ok(())
/// assert_eq!(x.unwrap(), ());
///
/// let x = assertable_f_ok_ge!(i32::from_str, "1", "2");
/// //-> Err("…")
/// // assertable failed: `assertable_f_ok_ge!(function, left, right)`
/// //    left input: `\"1\"`,
/// //   right input: `\"2\"`,
/// //   left output: `1`,
/// //  right output: `2`
/// assert_eq!(x.unwrap_err(), "assertable failed: `assertable_f_ok_ge!(function, left, right)`\n   left input: `\"1\"`,\n  right input: `\"2\"`,\n  left output: `1`,\n right output: `2`".to_string());
/// # }
/// ```
///
/// This macro has a second form where a custom message can be provided.
#[macro_export]
macro_rules! assertable_f_ok_ge {
    ($function:path, $left:expr, $right:expr $(,)?) => ({
        let left = $function($left);
        let right = $function($right);
        if !left.is_ok() || !right.is_ok() {
            Err(format!("assertable failed: `assertable_f_ok_ge!(function, left, right)`\n   left input: `{:?}`,\n  right input: `{:?}`\n  left output is_ok(): `{:?}`,\n right output is_ok(): `{:?}`", $left, $right, left.is_ok(), right.is_ok()))
        } else {
            let left = left.unwrap();
            let right = right.unwrap();
            if (left >= right) {
                Ok(())
            } else {
                Err(format!("assertable failed: `assertable_f_ok_ge!(function, left, right)`\n   left input: `{:?}`,\n  right input: `{:?}`,\n  left output: `{:?}`,\n right output: `{:?}`", $left, $right, left, right))
            }
        }
    });
    ($function:path, $left:expr, $right:expr, $($arg:tt)+) => ({
        let left = $function($left);
        let right = $function($right);
        if !left.is_ok() || !right.is_ok() {
            Err($($arg)+)
        } else {
            let left = left.unwrap();
            let right = right.unwrap();
            if (left >= right) {
                Ok(())
            } else {
                Err($($arg)+)
            }
        }
    });
}

#[cfg(test)]
mod tests {
    use std::str::FromStr;

    #[test]
    fn test_assertable_f_ok_ge_x_arity_2_gt_success() {
        let a = "2";
        let b = "1";
        let x = assertable_f_ok_ge!(i32::from_str, a, b);
        assert_eq!(
            x.unwrap(),
            ()
        );
    }

    #[test]
    fn test_assertable_f_ok_ge_x_arity_2_eq_success() {
        let a = "1";
        let b = "1";
        let x = assertable_f_ok_ge!(i32::from_str, a, b);
        assert_eq!(
            x.unwrap(),
            ()
        );
    }

    #[test]
    fn test_assertable_f_ok_ge_x_arity_2_failure() {
        let a = "1";
        let b = "2";
        let x = assertable_f_ok_ge!(i32::from_str, a, b);
        assert_eq!(
            x.unwrap_err(),
            "assertable failed: `assertable_f_ok_ge!(function, left, right)`\n   left input: `\"1\"`,\n  right input: `\"2\"`,\n  left output: `1`,\n right output: `2`"
        );
    }

    #[test]
    fn test_assertable_f_ok_ge_x_arity_3_gt_success() {
        let a = "2";
        let b = "1";
        let x = assertable_f_ok_ge!(i32::from_str, a, b, "message");
        assert_eq!(
            x.unwrap(),
            ()
        );
    }

    #[test]
    fn test_assertable_f_ok_ge_x_arity_3_eq_success() {
        let a = "1";
        let b = "1";
        let x = assertable_f_ok_ge!(i32::from_str, a, b, "message");
        assert_eq!(
            x.unwrap(),
            ()
        );
    }

    #[test]
    fn test_assertable_f_ok_ge_x_arity_3_lt_failure() {
        let a = "1";
        let b = "2";
        let x = assertable_f_ok_ge!(i32::from_str, a, b, "message");
        assert_eq!(
            x.unwrap_err(),
            "message"
        );
    }

}