/* -----------------------------------------------------------------
 * Programmer(s): Daniel R. Reynolds @ SMU
 * -----------------------------------------------------------------
 * SUNDIALS Copyright Start
 * Copyright (c) 2002-2020, Lawrence Livermore National Security
 * and Southern Methodist University.
 * All rights reserved.
 *
 * See the top-level LICENSE and NOTICE files for details.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 * SUNDIALS Copyright End
 * -----------------------------------------------------------------
 * This is the testing routine to check the NVECTOR ManyVector
 * (serial) module implementation.
 * -----------------------------------------------------------------*/

#include <stdio.h>
#include <stdlib.h>

#include <sundials/sundials_types.h>
#include <nvector/nvector_manyvector.h>
#include <nvector/nvector_serial.h>
#include <sundials/sundials_math.h>
#include "test_nvector.h"

/* ----------------------------------------------------------------------
 * Main NVector Testing Routine
 * --------------------------------------------------------------------*/
int main(int argc, char *argv[])
{
  int          fails = 0;         /* counter for test failures */
  int          retval;            /* function return value     */
  sunindextype len1, len2;        /* vector lengths            */
  sunindextype length;            /* overall vector length     */
  N_Vector     Xsub[2];           /* subvector pointer array   */
  N_Vector     U, V, W, X, Y, Z;  /* test vectors              */
  int          print_timing;      /* turn timing on/off        */


  /* check input and set vector length */
  if (argc < 4){
    printf("ERROR: THREE (3) Inputs required: subvector 1 length, subvector 2 length, print timing \n");
    return(-1);
  }

  len1 = (sunindextype) atol(argv[1]);
  if (len1 <= 0) {
    printf("ERROR: length of subvector 1 must be a positive integer \n");
    return(-1);
  }

  len2 = (sunindextype) atol(argv[2]);
  if (len2 <= 0) {
    printf("ERROR: length of subvector 2 must be a positive integer \n");
    return(-1);
  }

  print_timing = atoi(argv[3]);
  SetTiming(print_timing, 0);

  /* overall length */
  length = len1 + len2;

  printf("Testing ManyVector (serial) N_Vector \n");
  printf("Vector lengths: %ld %ld \n", (long int) len1, (long int) len2);

  /* Create subvectors */
  Xsub[0] = N_VNew_Serial(len1);
  if (Xsub[0] == NULL) {
    printf("FAIL: Unable to create a new serial subvector \n\n");
    return(1);
  }
  Xsub[1] = N_VNew_Serial(len2);
  if (Xsub[1] == NULL) {
    N_VDestroy(Xsub[0]);
    printf("FAIL: Unable to create a new serial subvector \n\n");
    return(1);
  }

  /* Create a new ManyVector */
  X = N_VNew_ManyVector(2, Xsub);

  /* Check vector ID */
  fails += Test_N_VGetVectorID(X, SUNDIALS_NVEC_MANYVECTOR, 0);

  /* Check vector length */
  fails += Test_N_VGetLength(X, 0);

  /* Check vector communicator */
  fails += Test_N_VGetCommunicator(X, NULL, 0);

  /* Test subvector accessors */
  if (N_VGetNumSubvectors_ManyVector(X) != 2) {
    printf(">>> FAILED test -- N_VGetNumSubvectors_ManyVector\n");
    fails += 1;
  }
  U = N_VGetSubvector_ManyVector(X, 0);
  if (N_VGetLength(U) != len1) {
    printf(">>> FAILED test -- N_VGetSubvector_ManyVector\n");
    fails += 1;
  }
  U = N_VGetSubvector_ManyVector(X, 1);
  if (N_VGetLength(U) != len2) {
    printf(">>> FAILED test -- N_VGetSubvector_ManyVector\n");
    fails += 1;
  }

  /* Clone additional vectors for testing */
  W = N_VClone(X);
  if (W == NULL) {
    N_VDestroy(X);
    printf("FAIL: Unable to create a new vector\n\n");
    return(1);
  }

  Y = N_VClone(X);
  if (Y == NULL) {
    N_VDestroy(W);
    N_VDestroy(X);
    printf("FAIL: Unable to create a new vector\n\n");
    return(1);
  }

  Z = N_VClone(X);
  if (Z == NULL) {
    N_VDestroy(W);
    N_VDestroy(X);
    N_VDestroy(Y);
    printf("FAIL: Unable to create a new vector\n\n");
    return(1);
  }

  /* Standard vector operation tests */
  printf("\nTesting standard vector operations:\n\n");

  fails += Test_N_VConst(X, length, 0);
  fails += Test_N_VLinearSum(X, Y, Z, length, 0);
  fails += Test_N_VProd(X, Y, Z, length, 0);
  fails += Test_N_VDiv(X, Y, Z, length, 0);
  fails += Test_N_VScale(X, Z, length, 0);
  fails += Test_N_VAbs(X, Z, length, 0);
  fails += Test_N_VInv(X, Z, length, 0);
  fails += Test_N_VAddConst(X, Z, length, 0);
  fails += Test_N_VDotProd(X, Y, length, 0);
  fails += Test_N_VMaxNorm(X, length, 0);
  fails += Test_N_VWrmsNorm(X, Y, length, 0);
  fails += Test_N_VWrmsNormMask(X, Y, Z, length, 0);
  fails += Test_N_VMin(X, length, 0);
  fails += Test_N_VWL2Norm(X, Y, length, 0);
  fails += Test_N_VL1Norm(X, length, 0);
  fails += Test_N_VCompare(X, Z, length, 0);
  fails += Test_N_VInvTest(X, Z, length, 0);
  fails += Test_N_VConstrMask(X, Y, Z, length, 0);
  fails += Test_N_VMinQuotient(X, Y, length, 0);

  /* Fused and vector array operations tests (disabled) */
  printf("\nTesting fused and vector array operations (disabled):\n\n");

  /* create vector and disable all fused and vector array operations */
  U = N_VClone(X);
  retval = N_VEnableFusedOps_ManyVector(U, SUNFALSE);
  if (U == NULL || retval != 0) {
    N_VDestroy(W);
    N_VDestroy(X);
    N_VDestroy(Y);
    N_VDestroy(Z);
    printf("FAIL: Unable to create a new vector \n\n");
    return(1);
  }

  /* fused operations */
  fails += Test_N_VLinearCombination(U, length, 0);
  fails += Test_N_VScaleAddMulti(U, length, 0);
  fails += Test_N_VDotProdMulti(U, length, 0);

  /* vector array operations */
  fails += Test_N_VLinearSumVectorArray(U, length, 0);
  fails += Test_N_VScaleVectorArray(U, length, 0);
  fails += Test_N_VConstVectorArray(U, length, 0);
  fails += Test_N_VWrmsNormVectorArray(U, length, 0);
  fails += Test_N_VWrmsNormMaskVectorArray(U, length, 0);
  fails += Test_N_VScaleAddMultiVectorArray(U, length, 0);
  fails += Test_N_VLinearCombinationVectorArray(U, length, 0);

  /* Fused and vector array operations tests (enabled) */
  printf("\nTesting fused and vector array operations (enabled):\n\n");

  /* create vector and enable all fused and vector array operations */
  V = N_VClone(X);
  retval = N_VEnableFusedOps_ManyVector(V, SUNTRUE);
  if (V == NULL || retval != 0) {
    N_VDestroy(W);
    N_VDestroy(X);
    N_VDestroy(Y);
    N_VDestroy(Z);
    N_VDestroy(U);
    printf("FAIL: Unable to create a new vector \n\n");
    return(1);
  }

  /* fused operations */
  fails += Test_N_VLinearCombination(V, length, 0);
  fails += Test_N_VScaleAddMulti(V, length, 0);
  fails += Test_N_VDotProdMulti(V, length, 0);

  /* vector array operations */
  fails += Test_N_VLinearSumVectorArray(V, length, 0);
  fails += Test_N_VScaleVectorArray(V, length, 0);
  fails += Test_N_VConstVectorArray(V, length, 0);
  fails += Test_N_VWrmsNormVectorArray(V, length, 0);
  fails += Test_N_VWrmsNormMaskVectorArray(V, length, 0);
  fails += Test_N_VScaleAddMultiVectorArray(V, length, 0);
  fails += Test_N_VLinearCombinationVectorArray(V, length, 0);

  /* local reduction operations */
  printf("\nTesting local reduction operations:\n\n");

  fails += Test_N_VDotProdLocal(X, Y, length, 0);
  fails += Test_N_VMaxNormLocal(X, length, 0);
  fails += Test_N_VMinLocal(X, length, 0);
  fails += Test_N_VL1NormLocal(X, length, 0);
  fails += Test_N_VWSqrSumLocal(X, Y, length, 0);
  fails += Test_N_VWSqrSumMaskLocal(X, Y, Z, length, 0);
  fails += Test_N_VInvTestLocal(X, Z, length, 0);
  fails += Test_N_VConstrMaskLocal(X, Y, Z, length, 0);
  fails += Test_N_VMinQuotientLocal(X, Y, length, 0);

  /* XBraid interface operations */
  printf("\nTesting XBraid interface operations:\n\n");

  fails += Test_N_VBufSize(X, length, 0);
  fails += Test_N_VBufPack(X, length, 0);
  fails += Test_N_VBufUnpack(X, length, 0);

  /* Free vectors */
  N_VDestroy(W);
  N_VDestroy(X);
  N_VDestroy(Y);
  N_VDestroy(Z);
  N_VDestroy(U);
  N_VDestroy(V);
  N_VDestroy(Xsub[0]);
  N_VDestroy(Xsub[1]);

  /* Print result */
  if (fails) {
    printf("FAIL: NVector module failed %i tests \n\n", fails);
  } else {
    printf("SUCCESS: NVector module passed all tests \n\n");
  }

  return(fails);
}

/* ----------------------------------------------------------------------
 * Implementation specific utility functions for vector tests
 * --------------------------------------------------------------------*/
int check_ans(realtype ans, N_Vector X, sunindextype local_length)
{
  int          failure = 0;
  sunindextype i;
  N_Vector     Xsub[2];
  realtype     *x0, *x1;
  sunindextype x0len, x1len;

  Xsub[0] = N_VGetSubvector_ManyVector(X, 0);
  Xsub[1] = N_VGetSubvector_ManyVector(X, 1);
  x0len = N_VGetLength(Xsub[0]);
  x1len = N_VGetLength(Xsub[1]);
  x0 = N_VGetSubvectorArrayPointer_ManyVector(X, 0);
  x1 = N_VGetSubvectorArrayPointer_ManyVector(X, 1);

  /* ensure that local_length = x0len + x1len */
  if (local_length != x0len+x1len)
    return(1);

  /* check vector data */
  for (i=0; i<x0len; i++)  failure += FNEQ(x0[i], ans);
  for (i=0; i<x1len; i++)  failure += FNEQ(x1[i], ans);

  return (failure > ZERO) ? (1) : (0);
}

booleantype has_data(N_Vector X)
{
  /* should not be called in these tests */
  return SUNTRUE;
}

void set_element(N_Vector X, sunindextype i, realtype val)
{
  N_Vector     Xsub[2];
  sunindextype x0len;

  Xsub[0] = N_VGetSubvector_ManyVector(X, 0);
  Xsub[1] = N_VGetSubvector_ManyVector(X, 1);
  x0len = N_VGetLength(Xsub[0]);

  /* set i-th element of data array (in appropriate subvector) */
  if (i < x0len) {
    NV_Ith_S(Xsub[0],i) = val;
  } else {
    NV_Ith_S(Xsub[1], i-x0len) = val;
  }
}

void set_element_range(N_Vector X, sunindextype is, sunindextype ie, realtype val)
{
  N_Vector     Xsub[2];
  sunindextype x0len, i;

  Xsub[0] = N_VGetSubvector_ManyVector(X, 0);
  Xsub[1] = N_VGetSubvector_ManyVector(X, 1);
  x0len = N_VGetLength(Xsub[0]);

  /* set i-th element of data array (in appropriate subvector) */
  for (i=is; i<x0len; i++)  NV_Ith_S(Xsub[0],i) = val;
  for (i=x0len; i<=ie; i++)  NV_Ith_S(Xsub[1], i-x0len) = val;
}

realtype get_element(N_Vector X, sunindextype i)
{
  N_Vector     Xsub[2];
  sunindextype x0len;

  Xsub[0] = N_VGetSubvector_ManyVector(X, 0);
  Xsub[1] = N_VGetSubvector_ManyVector(X, 1);
  x0len = N_VGetLength(Xsub[0]);

  /* get i-th element of data array (from appropriate subvector) */
  if (i < x0len) {
    return NV_Ith_S(Xsub[0],i);
  } else {
    return NV_Ith_S(Xsub[1], i-x0len);
  }
}

double max_time(N_Vector X, double time)
{
  /* not running in parallel, just return input time */
  return(time);
}

void sync_device()
{
  /* not running on GPU, just return */
  return;
}
