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#![cfg(feature = "deprecated")]

use crate::reducer::*;

macro_rules! impl_reducer_for_arrays {
    () => {};

    ( $head:ident $(, $tail:ident)* $(,)? ) => {
        impl_reducer_for_arrays!($($tail,)*);

        /// Updates all [`Reducer`]s in the array in order.
        ///
        /// <small>Currently implemented for arrays of up to 32 elements.</small>
        ///
        /// **Warning: this implementation is deprecated and will be removed in a future release.**
        #[deprecated]
        impl<A, T> Reducer<A> for [T; count!($($tail,)*)]
        where
            A: Clone,
            T: Reducer<A>,
        {
            fn reduce(&mut self, action: A) {
                self[..].reduce(action);
            }
        }
    };
}

impl_reducer_for_arrays!(
    _32, _31, _30, _29, _28, _27, _26, _25, _24, _23, _22, _21, _20, _19, _18, _17, _16, _15, _14,
    _13, _12, _11, _10, _09, _08, _07, _06, _05, _04, _03, _02, _01, _00
);

#[cfg(test)]
mod tests {
    use super::*;
    use mockall::predicate::*;
    use proptest::prelude::*;

    macro_rules! test_reducer_for_arrays {
        () => {};

        ( $head:ident $(, $tail:ident)* $(,)? ) => {
            proptest! {
                #[test]
                fn $head(action: u8) {
                    let mut reducer: [MockReducer<_>; count!($($tail,)*)] = Default::default();

                    for mock in &mut reducer {
                        mock.expect_reduce()
                            .with(eq(action))
                            .times(1)
                            .return_const(());
                    }

                    Reducer::reduce(&mut reducer, action);
                }
            }

            test_reducer_for_arrays!($($tail,)*);
        };
    }

    test_reducer_for_arrays!(
        _32, _31, _30, _29, _28, _27, _26, _25, _24, _23, _22, _21, _20, _19, _18, _17, _16, _15,
        _14, _13, _12, _11, _10, _09, _08, _07, _06, _05, _04, _03, _02, _01, _00
    );
}