// Copyright © 2024 Mikhail Hogrefe
//
// This file is part of Malachite.
//
// Malachite is free software: you can redistribute it and/or modify it under the terms of the GNU
// Lesser General Public License (LGPL) as published by the Free Software Foundation; either version
// 3 of the License, or (at your option) any later version. See <https://www.gnu.org/licenses/>.

use malachite_base::num::basic::unsigneds::PrimitiveUnsigned;
use malachite_base::num::conversion::traits::{JoinHalves, SplitInHalf};
use malachite_base::test_util::generators::unsigned_gen;

fn split_in_half_test_helper<T: PrimitiveUnsigned + SplitInHalf>(n: T, out: (T::Half, T::Half))
where
    T::Half: PrimitiveUnsigned,
{
    assert_eq!(n.split_in_half(), out);
}

#[test]
pub fn test_split_in_half() {
    split_in_half_test_helper(0u64, (0u32, 0u32));
    split_in_half_test_helper(1u64, (0u32, 1u32));
    split_in_half_test_helper(u16::from(u8::MAX), (0, u8::MAX));
    split_in_half_test_helper(u16::from(u8::MAX) + 1, (1, 0));
    split_in_half_test_helper(u16::MAX, (u8::MAX, u8::MAX));
    split_in_half_test_helper(258u16, (1u8, 2u8));
    split_in_half_test_helper(0xabcd1234u32, (0xabcd, 0x1234));
}

fn split_in_half_properties_helper<T: JoinHalves + PrimitiveUnsigned + SplitInHalf>() {
    unsigned_gen::<T>().test_properties(|n| {
        let (upper, lower) = n.split_in_half();
        assert_eq!(T::join_halves(upper, lower), n);
    });
}

#[test]
fn split_in_half_properties() {
    split_in_half_properties_helper::<u16>();
    split_in_half_properties_helper::<u32>();
    split_in_half_properties_helper::<u64>();
    split_in_half_properties_helper::<u128>();
}