#include "convolution.h"
#include <mpi.h>
#include <stdio.h>
#include "util.h"

static float *input, *output, *filter;
static int N, C, H, W;
static int K, R, S;
static int OH, OW;
static int pad;
static int dilation;
static int stride;
static int mpi_rank, mpi_world_size;
static int N_MPI;

static int chs, remain;
MPI_Status status;
MPI_Request request;


static void convolution_omp() {
	#pragma omp parallel for collapse(2) num_threads(20)
    for (int n = 0; n < chs; ++n) {
      for (int k = 0; k < K; ++k) {
        for (int oh = 0; oh < OH; ++oh) {
          for (int ow = 0; ow < OW; ++ow) {
            float o = 0.f;
            for (int c = 0; c < C; ++c) {
              for (int r = 0; r < R; ++r) {
                for (int s = 0; s < S; ++s) {
                  int h = oh * stride - pad + r * dilation;
                  int w = ow * stride - pad + s * dilation;
                  if (h < 0 || h >= H || w < 0 || w >= W) continue;
                  float i = input[n * C * H * W + c * H * W + h * W + w];
                  float f = filter[k * C * R * S + c * R * S + r * S + s];
                  o += i * f;
                }
              }
            }
            output[n * K * OH * OW + k * OH * OW + oh * OW + ow] = o;
          }
        }
      }
    }
}


void convolution(
    float *_input, float *_output, float *_filter, 
    int _N, int _C, int _H, int _W,
    int _K, int _R, int _S,
    int _pad, int _dilation, int _stride) {
  input = _input;
  output = _output;
  filter = _filter;

  OH = (H + 2 * pad - dilation * (R - 1) - 1) / stride + 1;
  OW = (W + 2 * pad - dilation * (S - 1) - 1) / stride + 1;
  printf("[SSS0] chs=%d  remain=%d  mpi_rank=%d\n",chs,remain,mpi_rank);
  
  if (mpi_rank == 0) {
	  
	chs = N/(N_MPI);
    remain = N%(N_MPI);
	
		printf("[SSS1] chs=%d C=%d, H=%d, W=%d remain=%d\n",chs,remain,C, H, W);	
	
	MPI_Isend(&chs, 1, MPI_INT, 1, 1, MPI_COMM_WORLD, &request);
	MPI_Isend(&input[(chs+remain)*C*H*W], chs*C*H*W, MPI_FLOAT, 1, 1, MPI_COMM_WORLD, &request);
//	MPI_Isend(&filter, K*C*R*S, MPI_FLOAT, 1, 1, MPI_COMM_WORLD, &request);

	chs += remain; 
	convolution_omp();
	
//	MPI_Recv(&chs, 1, MPI_INT, 1, 2, MPI_COMM_WORLD, &status);
//    MPI_Recv(&output[(chs+remain)*K*OH*OW], chs*K*OH*OW, MPI_FLOAT, 1, 2, MPI_COMM_WORLD, &status);

  }
  if (mpi_rank == 1){
	  
	
	MPI_Recv(&chs, 1, MPI_INT, 0, 1, MPI_COMM_WORLD, &status);	
	
	printf("[SSS2] chs=%d C=%d, H=%d, W=%d remain=%d\n",chs,remain,C, H, W);	
	
	alloc_tensor(&input, chs, C, H, W);
    alloc_tensor(&output, chs, K, OH, OW);
    alloc_tensor(&filter, K, C, R, S);
	
	
    MPI_Recv(&input, chs*C*H*W, MPI_FLOAT, 0, 1, MPI_COMM_WORLD, &status);
//	MPI_Recv(&filter, K*C*R*S, MPI_FLOAT,0, 1, MPI_COMM_WORLD, &status);


//	convolution_omp();
	
//	MPI_Isend(&chs, 1, MPI_INT, 0, 2, MPI_COMM_WORLD, &request);
//	MPI_Isend(&output, chs*K*OH*OW, MPI_FLOAT, 0, 2, MPI_COMM_WORLD, &request);
  }
}

void convolution_init(
    int _N, int _C, int _H, int _W,
    int _K, int _R, int _S,
    int _pad, int _dilation, int _stride) {
  N = _N; C = _C; H = _H; W = _W;
  K = _K; R = _R; S = _S;
  pad = _pad;
  dilation = _dilation;
  stride = _stride;

  MPI_Comm_rank(MPI_COMM_WORLD, &mpi_rank);
  MPI_Comm_size(MPI_COMM_WORLD, &mpi_world_size);
  
  if(N < mpi_world_size) N_MPI = N;
  else N_MPI = mpi_world_size;
      
}

void convolution_final(
    int _N, int _C, int _H, int _W,
    int _K, int _R, int _S,
    int _pad, int _dilation, int _stride) {
}