use super::*;
use std::fmt::Debug;

#[derive(Debug, PartialEq, Clone)]
pub struct CaseResult {
    pub case_index: usize,
    pub desc: String,
    pub result: Result<(), Error>,
}

impl CaseResult {
    pub fn new<T: Debug>(case_index: usize, case: &T, result: Result<(), Error>) -> Self {
        CaseResult {
            case_index,
            desc: format!("{:?}", case),
            result,
        }
    }
}

/// Compares `result` with `expected`.
///
/// If `expected.is_none()` then `result` is expected to be `Err`. Otherwise, `T` in `result` and
/// `expected` must be equal.
pub fn compare_result<T, E>(result: &Result<T, E>, expected: &Option<T>) -> Result<(), Error>
where
    T: PartialEq<T> + Debug,
    E: Debug,
{
    match (result, expected) {
        // Pass: The should have failed and did fail.
        (Err(_), None) => Ok(()),
        // Fail: The test failed when it should have produced a result (fail).
        (Err(e), Some(expected)) => Err(Error::NotEqual(format!(
            "Got {:?} Expected {:?}",
            e, expected
        ))),
        // Fail: The test produced a result when it should have failed (fail).
        (Ok(result), None) => Err(Error::DidntFail(format!("Got {:?}", result))),
        // Potential Pass: The test should have produced a result, and it did.
        (Ok(result), Some(expected)) => {
            if result == expected {
                Ok(())
            } else {
                Err(Error::NotEqual(format!(
                    "Got {:?} expected {:?}",
                    result, expected
                )))
            }
        }
    }
}