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

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

  CeedInit(argv[1], &ceed);

  // Setup
  CeedVectorCreate(ceed, 2*(num_elem*2), &x);

  for (CeedInt i=0; i<num_elem; i++) {
    ind[2*i+0] = i;
    ind[2*i+1] = i+1;
  }
  CeedElemRestrictionCreate(ceed, num_elem, 2, 2, num_elem+1, 2*(num_elem+1),
                            CEED_MEM_HOST,
                            CEED_USE_POINTER, ind, &r);
  CeedVectorCreate(ceed, 2*(num_elem+1), &y);
  CeedVectorSetValue(y, 0); // Allocates array

  // Set x data in backend E-layout
  CeedElemRestrictionGetELayout(r, &layout);
  for (CeedInt i=0; i<2; i++)      // Node
    for (CeedInt j=0; j<2; j++)    // Component
      for (CeedInt k=0; k<num_elem; k++) // Element
        a[i*layout[0] + j*layout[1] + k*layout[2]] = 10*j+(2*k+i+1)/2;
  CeedVectorSetArray(x, CEED_MEM_HOST, CEED_USE_POINTER, a);

  // Restrict
  CeedElemRestrictionApply(r, CEED_TRANSPOSE, x, y, CEED_REQUEST_IMMEDIATE);

  // Check
  CeedVectorGetArrayRead(y, CEED_MEM_HOST, &yy);
  for (CeedInt i=0; i<num_elem+1; i++) {
    mult = i>0&&i<num_elem ? 2 : 1;
    if (yy[i] != i*mult)
      // LCOV_EXCL_START
      printf("Error in restricted array y[%d] = %f != %f\n",
             i, (double)yy[i], i*mult);
    // LCOV_EXCL_STOP
    if (yy[i+num_elem+1] != (10+i)*mult)
      // LCOV_EXCL_START
      printf("Error in restricted array y[%d] = %f != %f\n",
             i+num_elem+1, (double)yy[i+num_elem+1], (10.+i)*mult);
    // LCOV_EXCL_STOP
  }

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