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// MIT License

// Copyright (c) 2019-2022 The orion Developers

// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:

// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

#[derive(Clone, Copy, Default)]
pub(crate) struct U64x4(
    pub(crate) u64,
    pub(crate) u64,
    pub(crate) u64,
    pub(crate) u64,
);

impl core::ops::BitXor for U64x4 {
    type Output = Self;

    #[must_use]
    fn bitxor(self, _rhs: Self) -> Self::Output {
        Self(
            self.0 ^ _rhs.0,
            self.1 ^ _rhs.1,
            self.2 ^ _rhs.2,
            self.3 ^ _rhs.3,
        )
    }
}

impl core::ops::BitXorAssign for U64x4 {
    fn bitxor_assign(&mut self, _rhs: Self) {
        self.0 ^= _rhs.0;
        self.1 ^= _rhs.1;
        self.2 ^= _rhs.2;
        self.3 ^= _rhs.3;
    }
}

impl zeroize::Zeroize for U64x4 {
    fn zeroize(&mut self) {
        self.0.zeroize();
        self.1.zeroize();
        self.2.zeroize();
        self.3.zeroize();
    }
}

#[cfg(test)]
impl PartialEq<U64x4> for U64x4 {
    fn eq(&self, other: &Self) -> bool {
        self.0 == other.0 && self.1 == other.1 && self.2 == other.2 && self.3 == other.3
    }
}

impl U64x4 {
    #[must_use]
    pub(crate) const fn wrapping_add(self, _rhs: Self) -> Self {
        Self(
            self.0.wrapping_add(_rhs.0),
            self.1.wrapping_add(_rhs.1),
            self.2.wrapping_add(_rhs.2),
            self.3.wrapping_add(_rhs.3),
        )
    }

    #[must_use]
    pub(crate) const fn shl_1(self) -> Self {
        Self(self.1, self.2, self.3, self.0)
    }

    #[must_use]
    pub(crate) const fn shl_2(self) -> Self {
        Self(self.2, self.3, self.0, self.1)
    }

    #[must_use]
    pub(crate) const fn shl_3(self) -> Self {
        Self(self.3, self.0, self.1, self.2)
    }

    #[must_use]
    pub(crate) const fn rotate_right(self, n: u32) -> Self {
        Self(
            self.0.rotate_right(n),
            self.1.rotate_right(n),
            self.2.rotate_right(n),
            self.3.rotate_right(n),
        )
    }

    pub(crate) fn store_into_le(self, slice_in: &mut [u8]) {
        debug_assert_eq!(slice_in.len(), core::mem::size_of::<u64>() * 4);
        let mut iter = slice_in.chunks_exact_mut(core::mem::size_of::<u64>());
        iter.next().unwrap().copy_from_slice(&self.0.to_le_bytes());
        iter.next().unwrap().copy_from_slice(&self.1.to_le_bytes());
        iter.next().unwrap().copy_from_slice(&self.2.to_le_bytes());
        iter.next().unwrap().copy_from_slice(&self.3.to_le_bytes());
    }
}