/// @file
/// Test creation, use, and destruction of a blocked element restriction
/// \test Test creation, use, and destruction of a blocked element restriction
#include <ceed.h>
#include <ceed/backend.h>

int main(int argc, char **argv) {
  Ceed ceed;
  CeedVector x, y;
  CeedInt num_elem = 8;
  CeedInt elem_size = 2;
  CeedInt blk_size = 5;
  CeedInt ind[elem_size*num_elem];
  CeedScalar a[num_elem + 1];
  const CeedScalar *xx, *yy;
  CeedInt layout[3];
  CeedElemRestriction r;

  CeedInit(argv[1], &ceed);

  CeedVectorCreate(ceed, num_elem+1, &x);
  for (CeedInt i=0; i<num_elem+1; i++)
    a[i] = 10 + i;
  CeedVectorSetArray(x, CEED_MEM_HOST, CEED_USE_POINTER, a);

  for (CeedInt i=0; i<num_elem; i++) {
    ind[2*i+0] = i;
    ind[2*i+1] = i+1;
  }
  CeedElemRestrictionCreateBlocked(ceed, num_elem, elem_size, blk_size, 1, 1,
                                   num_elem+1, CEED_MEM_HOST, CEED_USE_POINTER,
                                   ind, &r);
  CeedVectorCreate(ceed, blk_size*elem_size, &y);

  // NoTranspose
  CeedElemRestrictionApplyBlock(r, 1, CEED_NOTRANSPOSE, x, y,
                                CEED_REQUEST_IMMEDIATE);
  CeedVectorGetArrayRead(y, CEED_MEM_HOST, &yy);
  CeedElemRestrictionGetELayout(r, &layout);
  for (CeedInt i=0; i<elem_size; i++)             // Node
    for (CeedInt j=0; j<1; j++)                   // Component
      for (CeedInt k=blk_size; k<num_elem; k++) { // Element
        CeedInt block = k / blk_size;
        CeedInt elem = k % blk_size;
        CeedInt index = (i*blk_size+elem)*layout[0] + j*layout[1]*blk_size +
                        block*layout[2]*blk_size - blk_size*elem_size;
        if (yy[index] != a[ind[k*elem_size + i]])
          // LCOV_EXCL_START
          printf("Error in restricted array y[%" CeedInt_FMT
                 "][%" CeedInt_FMT "][%" CeedInt_FMT "] = %f\n",
                 i, j, k, (double)yy[index]);
        // LCOV_EXCL_STOP
      }
  CeedVectorRestoreArrayRead(y, &yy);

  // Transpose
  CeedVectorSetValue(x, 0);
  CeedElemRestrictionApplyBlock(r, 1, CEED_TRANSPOSE, y, x,
                                CEED_REQUEST_IMMEDIATE);
  CeedVectorGetArrayRead(x, CEED_MEM_HOST, &xx);
  for (CeedInt i=blk_size; i<num_elem+1; i++)
    if (xx[i] != (10+i)*(i > blk_size && i < num_elem ? 2.0 : 1.0))
      // LCOV_EXCL_START
      printf("Error in restricted array x[%" CeedInt_FMT "] = %f\n",
             i, (double)xx[i]);
  // LCOV_EXCL_STOP
  CeedVectorRestoreArrayRead(x, &xx);

  CeedVectorDestroy(&x);
  CeedVectorDestroy(&y);
  CeedElemRestrictionDestroy(&r);
  CeedDestroy(&ceed);
  return 0;
}