#include "kernel_PinholeFocal_update_r.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)
    PinholeFocalUpdateRKernel(double* PinholeFocal_r_k,
                              unsigned int PinholeFocal_r_k_num_alloc,
                              double* PinholeFocal_w,
                              unsigned int PinholeFocal_w_num_alloc,
                              const double* const negalpha,
                              double* out_PinholeFocal_r_kp1,
                              unsigned int out_PinholeFocal_r_kp1_num_alloc,
                              double* const out_PinholeFocal_r_kp1_norm2_tot,
                              size_t problem_size) {
  const int global_thread_idx = blockIdx.x * blockDim.x + threadIdx.x;
  __shared__ uint8_t inout_shared[8192];

  __shared__ double out_PinholeFocal_r_kp1_norm2_tot_local[1];

  double r0, r1, r2, r3, r4;

  if (global_thread_idx < problem_size) {
    ReadIdx2<1024, double, double, double2>(PinholeFocal_r_k,
                                            0 * PinholeFocal_r_k_num_alloc,
                                            global_thread_idx,
                                            r0,
                                            r1);
    ReadIdx2<1024, double, double, double2>(PinholeFocal_w,
                                            0 * PinholeFocal_w_num_alloc,
                                            global_thread_idx,
                                            r2,
                                            r3);
  };
  LoadUnique<1, double, double>(negalpha, 0, (double*)inout_shared);
  if (global_thread_idx < problem_size) {
    ReadShared1<double>((double*)inout_shared, 0, r4);
  };
  __syncthreads();
  if (global_thread_idx < problem_size) {
    r2 = fma(r2, r4, r0);
    r4 = fma(r3, r4, r1);
    WriteIdx2<1024, double, double, double2>(
        out_PinholeFocal_r_kp1,
        0 * out_PinholeFocal_r_kp1_num_alloc,
        global_thread_idx,
        r2,
        r4);
    r2 = fma(r2, r2, r4 * r4);
  };
  SumStore<double>(out_PinholeFocal_r_kp1_norm2_tot_local,
                   (double*)inout_shared,
                   0,
                   global_thread_idx < problem_size,
                   r2);
  SumFlushFinal<double>(out_PinholeFocal_r_kp1_norm2_tot_local,
                        out_PinholeFocal_r_kp1_norm2_tot,
                        1);
}

void PinholeFocalUpdateR(double* PinholeFocal_r_k,
                         unsigned int PinholeFocal_r_k_num_alloc,
                         double* PinholeFocal_w,
                         unsigned int PinholeFocal_w_num_alloc,
                         const double* const negalpha,
                         double* out_PinholeFocal_r_kp1,
                         unsigned int out_PinholeFocal_r_kp1_num_alloc,
                         double* const out_PinholeFocal_r_kp1_norm2_tot,
                         size_t problem_size) {
  if (problem_size == 0) {
    return;
  }

  const int n_blocks = (problem_size + 1024 - 1) / 1024;
  PinholeFocalUpdateRKernel<<<n_blocks, 1024>>>(
      PinholeFocal_r_k,
      PinholeFocal_r_k_num_alloc,
      PinholeFocal_w,
      PinholeFocal_w_num_alloc,
      negalpha,
      out_PinholeFocal_r_kp1,
      out_PinholeFocal_r_kp1_num_alloc,
      out_PinholeFocal_r_kp1_norm2_tot,
      problem_size);
}

}  // namespace caspar