/*
 * // Copyright (c) Radzivon Bartoshyk 3/2025. All rights reserved.
 * //
 * // Redistribution and use in source and binary forms, with or without modification,
 * // are permitted provided that the following conditions are met:
 * //
 * // 1.  Redistributions of source code must retain the above copyright notice, this
 * // list of conditions and the following disclaimer.
 * //
 * // 2.  Redistributions in binary form must reproduce the above copyright notice,
 * // this list of conditions and the following disclaimer in the documentation
 * // and/or other materials provided with the distribution.
 * //
 * // 3.  Neither the name of the copyright holder nor the names of its
 * // contributors may be used to endorse or promote products derived from
 * // this software without specific prior written permission.
 * //
 * // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * // SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * // CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * // OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
#![cfg(feature = "avx512_shaper_fixed_point_paths")]
use crate::conversions::rgbxyz_fixed::TransformMatrixShaperFixedPointOpt;
use crate::transform::PointeeSizeExpressible;
use crate::{CmsError, Layout, TransformExecutor};
use num_traits::AsPrimitive;
use std::arch::x86_64::*;

pub(crate) struct TransformShaperRgbQ2_13OptAvx512<
    T: Copy,
    const SRC_LAYOUT: u8,
    const DST_LAYOUT: u8,
    const LINEAR_CAP: usize,
    const PRECISION: i32,
> {
    pub(crate) profile: TransformMatrixShaperFixedPointOpt<i32, i16, T, LINEAR_CAP>,
    pub(crate) bit_depth: usize,
    pub(crate) gamma_lut: usize,
}

#[inline(always)]
pub(crate) unsafe fn _xmm_broadcast_epi32(f: &i32) -> __m128i {
    let float_ref: &f32 = unsafe { &*(f as *const i32 as *const f32) };
    unsafe { _mm_castps_si128(_mm_broadcast_ss(float_ref)) }
}

#[repr(align(32), C)]
#[derive(Debug)]
pub(crate) struct AvxAlignedU16(pub(crate) [u16; 16]);

#[inline]
pub(crate) fn split_by_twos<T: Copy>(data: &[T], channels: usize) -> (&[T], &[T]) {
    let len = data.len() / (channels * 4);
    let split_point = len * 4;
    data.split_at(split_point * channels)
}
#[inline]
pub(crate) fn split_by_twos_mut<T: Copy>(data: &mut [T], channels: usize) -> (&mut [T], &mut [T]) {
    let len = data.len() / (channels * 4);
    let split_point = len * 4;
    data.split_at_mut(split_point * channels)
}

impl<
    T: Copy + PointeeSizeExpressible + 'static,
    const SRC_LAYOUT: u8,
    const DST_LAYOUT: u8,
    const LINEAR_CAP: usize,
    const PRECISION: i32,
> TransformShaperRgbQ2_13OptAvx512<T, SRC_LAYOUT, DST_LAYOUT, LINEAR_CAP, PRECISION>
where
    u32: AsPrimitive<T>,
{
    #[target_feature(enable = "avx512bw", enable = "avx512vl")]
    unsafe fn transform_avx512(&self, src: &[T], dst: &mut [T]) -> Result<(), CmsError> {
        let src_cn = Layout::from(SRC_LAYOUT);
        let dst_cn = Layout::from(DST_LAYOUT);
        let src_channels = src_cn.channels();
        let dst_channels = dst_cn.channels();

        if src.len() / src_channels != dst.len() / dst_channels {
            return Err(CmsError::LaneSizeMismatch);
        }
        if src.len() % src_channels != 0 {
            return Err(CmsError::LaneMultipleOfChannels);
        }
        if dst.len() % dst_channels != 0 {
            return Err(CmsError::LaneMultipleOfChannels);
        }

        let t = self.profile.adaptation_matrix.transpose();

        let max_colors = ((1 << self.bit_depth) - 1).as_();

        // If precision changed in another place it should be also changed here
        assert_eq!(PRECISION, 13);

        let (src_chunks, src_remainder) = split_by_twos(src, src_channels);
        let (dst_chunks, dst_remainder) = split_by_twos_mut(dst, dst_channels);

        let mut temporary0 = AvxAlignedU16([0; 16]);
        let mut temporary1 = AvxAlignedU16([0; 16]);

        unsafe {
            let m0 = _mm256_set_epi16(
                0, 0, t.v[1][2], t.v[0][2], t.v[1][1], t.v[0][1], t.v[1][0], t.v[0][0], 0, 0,
                t.v[1][2], t.v[0][2], t.v[1][1], t.v[0][1], t.v[1][0], t.v[0][0],
            );
            let m2 = _mm256_set_epi16(
                0, 0, 1, t.v[2][2], 1, t.v[2][1], 1, t.v[2][0], 0, 0, 1, t.v[2][2], 1, t.v[2][1],
                1, t.v[2][0],
            );

            let rnd_val = ((1i32 << (PRECISION - 1)) as i16).to_ne_bytes();
            let rnd = _mm256_set1_epi32(i32::from_ne_bytes([0, 0, rnd_val[0], rnd_val[1]]));

            let zeros = _mm256_setzero_si256();

            let v_max_value = _mm256_set1_epi32(self.gamma_lut as i32 - 1);

            let (mut r0, mut g0, mut b0, mut a0);
            let (mut r1, mut g1, mut b1, mut a1);
            let (mut r2, mut g2, mut b2, mut a2);
            let (mut r3, mut g3, mut b3, mut a3);

            if !src_chunks.is_empty() {
                let (src0, src1) = src_chunks.split_at(src_chunks.len() / 2);
                let (dst0, dst1) = dst_chunks.split_at_mut(dst_chunks.len() / 2);
                let src_iter0 = src0.chunks_exact(src_channels * 2);
                let src_iter1 = src1.chunks_exact(src_channels * 2);

                for (((src0, src1), dst0), dst1) in src_iter0
                    .zip(src_iter1)
                    .zip(dst0.chunks_exact_mut(dst_channels * 2))
                    .zip(dst1.chunks_exact_mut(dst_channels * 2))
                {
                    r0 = _xmm_broadcast_epi32(&self.profile.linear[src0[src_cn.r_i()]._as_usize()]);
                    g0 = _xmm_broadcast_epi32(&self.profile.linear[src0[src_cn.g_i()]._as_usize()]);
                    b0 = _xmm_broadcast_epi32(&self.profile.linear[src0[src_cn.b_i()]._as_usize()]);

                    r1 = _xmm_broadcast_epi32(
                        &self.profile.linear[src0[src_cn.r_i() + src_channels]._as_usize()],
                    );
                    g1 = _xmm_broadcast_epi32(
                        &self.profile.linear[src0[src_cn.g_i() + src_channels]._as_usize()],
                    );
                    b1 = _xmm_broadcast_epi32(
                        &self.profile.linear[src0[src_cn.b_i() + src_channels]._as_usize()],
                    );

                    r2 = _xmm_broadcast_epi32(&self.profile.linear[src1[src_cn.r_i()]._as_usize()]);
                    g2 = _xmm_broadcast_epi32(&self.profile.linear[src1[src_cn.g_i()]._as_usize()]);
                    b2 = _xmm_broadcast_epi32(&self.profile.linear[src1[src_cn.b_i()]._as_usize()]);

                    r3 = _xmm_broadcast_epi32(
                        &self.profile.linear[src1[src_cn.r_i() + src_channels]._as_usize()],
                    );
                    g3 = _xmm_broadcast_epi32(
                        &self.profile.linear[src1[src_cn.g_i() + src_channels]._as_usize()],
                    );
                    b3 = _xmm_broadcast_epi32(
                        &self.profile.linear[src1[src_cn.b_i() + src_channels]._as_usize()],
                    );

                    a0 = if src_channels == 4 {
                        src0[src_cn.a_i()]
                    } else {
                        max_colors
                    };
                    a1 = if src_channels == 4 {
                        src0[src_cn.a_i() + src_channels]
                    } else {
                        max_colors
                    };

                    a2 = if src_channels == 4 {
                        src1[src_cn.a_i()]
                    } else {
                        max_colors
                    };
                    a3 = if src_channels == 4 {
                        src1[src_cn.a_i() + src_channels]
                    } else {
                        max_colors
                    };

                    let zr0 = _mm256_inserti128_si256::<1>(_mm256_castsi128_si256(r0), r1);
                    let mut zg0 = _mm256_inserti128_si256::<1>(_mm256_castsi128_si256(g0), g1);
                    let zb0 = _mm256_inserti128_si256::<1>(_mm256_castsi128_si256(b0), b1);
                    zg0 = _mm256_slli_epi32::<16>(zg0);

                    let zr1 = _mm256_inserti128_si256::<1>(_mm256_castsi128_si256(r2), r3);
                    let mut zg1 = _mm256_inserti128_si256::<1>(_mm256_castsi128_si256(g2), g3);
                    let zb1 = _mm256_inserti128_si256::<1>(_mm256_castsi128_si256(b2), b3);
                    zg1 = _mm256_slli_epi32::<16>(zg1);

                    let zrg0 = _mm256_or_si256(zr0, zg0);
                    let zbz0 = _mm256_or_si256(zb0, rnd);

                    let zrg1 = _mm256_or_si256(zr1, zg1);
                    let zbz1 = _mm256_or_si256(zb1, rnd);

                    let va0 = _mm256_madd_epi16(zrg0, m0);
                    let va1 = _mm256_madd_epi16(zbz0, m2);

                    let va2 = _mm256_madd_epi16(zrg1, m0);
                    let va3 = _mm256_madd_epi16(zbz1, m2);

                    let mut v0 = _mm256_add_epi32(va0, va1);
                    let mut v1 = _mm256_add_epi32(va2, va3);

                    v0 = _mm256_srai_epi32::<PRECISION>(v0);
                    v0 = _mm256_max_epi32(v0, zeros);
                    v0 = _mm256_min_epi32(v0, v_max_value);

                    v1 = _mm256_srai_epi32::<PRECISION>(v1);
                    v1 = _mm256_max_epi32(v1, zeros);
                    v1 = _mm256_min_epi32(v1, v_max_value);

                    _mm256_store_si256(temporary0.0.as_mut_ptr() as *mut _, v0);
                    _mm256_store_si256(temporary1.0.as_mut_ptr() as *mut _, v1);

                    dst0[dst_cn.r_i()] = self.profile.gamma[temporary0.0[0] as usize];
                    dst0[dst_cn.g_i()] = self.profile.gamma[temporary0.0[2] as usize];
                    dst0[dst_cn.b_i()] = self.profile.gamma[temporary0.0[4] as usize];
                    if dst_channels == 4 {
                        dst0[dst_cn.a_i()] = a0;
                    }

                    dst0[dst_cn.r_i() + dst_channels] =
                        self.profile.gamma[temporary0.0[8] as usize];
                    dst0[dst_cn.g_i() + dst_channels] =
                        self.profile.gamma[temporary0.0[10] as usize];
                    dst0[dst_cn.b_i() + dst_channels] =
                        self.profile.gamma[temporary0.0[12] as usize];
                    if dst_channels == 4 {
                        dst0[dst_cn.a_i() + dst_channels] = a1;
                    }

                    dst1[dst_cn.r_i()] = self.profile.gamma[temporary1.0[0] as usize];
                    dst1[dst_cn.g_i()] = self.profile.gamma[temporary1.0[2] as usize];
                    dst1[dst_cn.b_i()] = self.profile.gamma[temporary1.0[4] as usize];
                    if dst_channels == 4 {
                        dst1[dst_cn.a_i()] = a2;
                    }

                    dst1[dst_cn.r_i() + dst_channels] =
                        self.profile.gamma[temporary1.0[8] as usize];
                    dst1[dst_cn.g_i() + dst_channels] =
                        self.profile.gamma[temporary1.0[10] as usize];
                    dst1[dst_cn.b_i() + dst_channels] =
                        self.profile.gamma[temporary1.0[12] as usize];
                    if dst_channels == 4 {
                        dst1[dst_cn.a_i() + dst_channels] = a3;
                    }
                }
            }

            for (src, dst) in src_remainder
                .chunks_exact(src_channels)
                .zip(dst_remainder.chunks_exact_mut(dst_channels))
            {
                let r = _xmm_broadcast_epi32(&self.profile.linear[src[src_cn.r_i()]._as_usize()]);
                let mut g =
                    _xmm_broadcast_epi32(&self.profile.linear[src[src_cn.g_i()]._as_usize()]);
                let b = _xmm_broadcast_epi32(&self.profile.linear[src[src_cn.b_i()]._as_usize()]);

                g = _mm_slli_epi32::<16>(g);

                let a = if src_channels == 4 {
                    src[src_cn.a_i()]
                } else {
                    max_colors
                };

                let zrg0 = _mm_or_si128(r, g);
                let zbz0 = _mm_or_si128(b, _mm256_castsi256_si128(rnd));

                let v0 = _mm_madd_epi16(zrg0, _mm256_castsi256_si128(m0));
                let v1 = _mm_madd_epi16(zbz0, _mm256_castsi256_si128(m2));

                let mut v = _mm_add_epi32(v0, v1);

                v = _mm_srai_epi32::<PRECISION>(v);
                v = _mm_max_epi32(v, _mm_setzero_si128());
                v = _mm_min_epi32(v, _mm256_castsi256_si128(v_max_value));

                _mm_store_si128(temporary0.0.as_mut_ptr() as *mut _, v);

                dst[dst_cn.r_i()] = self.profile.gamma[temporary0.0[0] as usize];
                dst[dst_cn.g_i()] = self.profile.gamma[temporary0.0[2] as usize];
                dst[dst_cn.b_i()] = self.profile.gamma[temporary0.0[4] as usize];
                if dst_channels == 4 {
                    dst[dst_cn.a_i()] = a;
                }
            }
        }

        Ok(())
    }
}

impl<
    T: Copy + PointeeSizeExpressible + 'static + Default,
    const SRC_LAYOUT: u8,
    const DST_LAYOUT: u8,
    const LINEAR_CAP: usize,
    const PRECISION: i32,
> TransformExecutor<T>
    for TransformShaperRgbQ2_13OptAvx512<T, SRC_LAYOUT, DST_LAYOUT, LINEAR_CAP, PRECISION>
where
    u32: AsPrimitive<T>,
{
    fn transform(&self, src: &[T], dst: &mut [T]) -> Result<(), CmsError> {
        unsafe { self.transform_avx512(src, dst) }
    }
}
