#include "kernel_Point_update_Mp.h"
#include "memops.cuh"
#include <cooperative_groups.h>
#include <cooperative_groups/details/partitioning.h>
#include <cooperative_groups/memcpy_async.h>
#include <cooperative_groups/reduce.h>
#include <cuda_runtime.h>

namespace cg = cooperative_groups;

namespace caspar {

__global__ void __launch_bounds__(1024, 1)
    PointUpdateMpKernel(float* Point_r_k,
                        unsigned int Point_r_k_num_alloc,
                        float* Point_Mp,
                        unsigned int Point_Mp_num_alloc,
                        const float* const beta,
                        float* out_Point_Mp_kp1,
                        unsigned int out_Point_Mp_kp1_num_alloc,
                        float* out_Point_w,
                        unsigned int out_Point_w_num_alloc,
                        size_t problem_size) {
  const int global_thread_idx = blockIdx.x * blockDim.x + threadIdx.x;
  __shared__ uint8_t inout_shared[4096];

  float r0, r1, r2, r3, r4, r5, r6;

  if (global_thread_idx < problem_size) {
    ReadIdx3<1024, float, float, float4>(
        Point_Mp, 0 * Point_Mp_num_alloc, global_thread_idx, r0, r1, r2);
    ReadIdx3<1024, float, float, float4>(
        Point_r_k, 0 * Point_r_k_num_alloc, global_thread_idx, r3, r4, r5);
  };
  LoadUnique<1, float, float>(beta, 0, (float*)inout_shared);
  if (global_thread_idx < problem_size) {
    ReadShared1<float>((float*)inout_shared, 0, r6);
  };
  __syncthreads();
  if (global_thread_idx < problem_size) {
    r0 = fmaf(r0, r6, r3);
    r1 = fmaf(r1, r6, r4);
    r6 = fmaf(r2, r6, r5);
    WriteIdx3<1024, float, float, float4>(out_Point_Mp_kp1,
                                          0 * out_Point_Mp_kp1_num_alloc,
                                          global_thread_idx,
                                          r0,
                                          r1,
                                          r6);
    WriteIdx3<1024, float, float, float4>(
        out_Point_w, 0 * out_Point_w_num_alloc, global_thread_idx, r0, r1, r6);
  };
}

void PointUpdateMp(float* Point_r_k,
                   unsigned int Point_r_k_num_alloc,
                   float* Point_Mp,
                   unsigned int Point_Mp_num_alloc,
                   const float* const beta,
                   float* out_Point_Mp_kp1,
                   unsigned int out_Point_Mp_kp1_num_alloc,
                   float* out_Point_w,
                   unsigned int out_Point_w_num_alloc,
                   size_t problem_size) {
  if (problem_size == 0) {
    return;
  }

  const int n_blocks = (problem_size + 1024 - 1) / 1024;
  PointUpdateMpKernel<<<n_blocks, 1024>>>(Point_r_k,
                                          Point_r_k_num_alloc,
                                          Point_Mp,
                                          Point_Mp_num_alloc,
                                          beta,
                                          out_Point_Mp_kp1,
                                          out_Point_Mp_kp1_num_alloc,
                                          out_Point_w,
                                          out_Point_w_num_alloc,
                                          problem_size);
}

}  // namespace caspar