/*
 * Copyright (C) by Argonne National Laboratory
 *     See COPYRIGHT in top-level directory
 */

#include "mpi.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "mpitest.h"

/*
   The default behavior of the test routines should be to briefly indicate
   the cause of any errors - in this test, that means that verbose needs
   to be set. Verbose should turn on output that is independent of error
   levels.
*/
static int verbose = 1;

/* tests */
int darray_2d_c_test1(void);
int darray_4d_c_test1(void);

/* helper functions */
static int parse_args(int argc, char **argv);
static int pack_and_unpack(char *typebuf, int count, MPI_Datatype datatype, int typebufsz);

int main(int argc, char **argv)
{
    int err, errs = 0;

    MTest_Init(&argc, &argv);
    parse_args(argc, argv);

    /* To improve reporting of problems about operations, we
     * change the error handler to errors return */
    MPI_Comm_set_errhandler(MPI_COMM_WORLD, MPI_ERRORS_RETURN);

    /* perform some tests */
    err = darray_2d_c_test1();
    if (err && verbose)
        fprintf(stderr, "%d errors in 2d darray c test 1.\n", err);
    errs += err;

    err = darray_4d_c_test1();
    if (err && verbose)
        fprintf(stderr, "%d errors in 4d darray c test 1.\n", err);
    errs += err;

    /* print message and exit */
    /* Allow the use of more than one process - some MPI implementations
     * (including IBM's) check that the number of processes given to
     * Type_create_darray is no larger than MPI_COMM_WORLD */

    MTest_Finalize(errs);
    return MTestReturnValue(errs);
}

/* darray_2d_test1()
 *
 * Performs a sequence of tests building darrays with single-element
 * blocks, running through all the various positions that the element might
 * come from.
 *
 * Returns the number of errors encountered.
 */
int darray_2d_c_test1(void)
{
    MPI_Datatype darray;
    int array[9];               /* initialized below */
    int array_size[2] = { 3, 3 };
    int array_distrib[2] = { MPI_DISTRIBUTE_BLOCK, MPI_DISTRIBUTE_BLOCK };
    int array_dargs[2] = { MPI_DISTRIBUTE_DFLT_DARG, MPI_DISTRIBUTE_DFLT_DARG };
    int array_psizes[2] = { 3, 3 };

    int i, rank, err, errs = 0, sizeoftype;

    /* pretend we are each rank, one at a time */
    for (rank = 0; rank < 9; rank++) {
        /* set up buffer */
        for (i = 0; i < 9; i++) {
            array[i] = i;
        }

        /* set up type */
        err = MPI_Type_create_darray(9, /* size */
                                     rank, 2,   /* dims */
                                     array_size,
                                     array_distrib,
                                     array_dargs, array_psizes, MPI_ORDER_C, MPI_INT, &darray);
        if (err != MPI_SUCCESS) {
            errs++;
            if (verbose) {
                fprintf(stderr,
                        "error in MPI_Type_create_darray call; aborting after %d errors\n", errs);
            }
            MTestPrintError(err);
            return errs;
        }

        MPI_Type_commit(&darray);

        MPI_Type_size(darray, &sizeoftype);
        if (sizeoftype != sizeof(int)) {
            errs++;
            if (verbose)
                fprintf(stderr, "size of type = %d; should be %d\n", sizeoftype, (int) sizeof(int));
            return errs;
        }

        err = pack_and_unpack((char *) array, 1, darray, 9 * sizeof(int));

        for (i = 0; i < 9; i++) {

            if ((i == rank) && (array[i] != rank)) {
                errs++;
                if (verbose)
                    fprintf(stderr, "[2d array rank=%d]:array[%d] = %d; should be %d\n",
                            rank, i, array[i], rank);
            } else if ((i != rank) && (array[i] != 0)) {
                errs++;
                if (verbose)
                    fprintf(stderr, "[2d array rank=%d]:array[%d] = %d; should be %d\n",
                            rank, i, array[i], 0);
            }
        }
        MPI_Type_free(&darray);
    }

    return errs;
}

/* darray_4d_c_test1()
 *
 * Returns the number of errors encountered.
 */
int darray_4d_c_test1(void)
{
    MPI_Datatype darray;
    int array[72];
    int array_size[4] = { 6, 3, 2, 2 };
    int array_distrib[4] = { MPI_DISTRIBUTE_BLOCK,
        MPI_DISTRIBUTE_BLOCK,
        MPI_DISTRIBUTE_NONE,
        MPI_DISTRIBUTE_NONE
    };
    int array_dargs[4] = { MPI_DISTRIBUTE_DFLT_DARG,
        MPI_DISTRIBUTE_DFLT_DARG,
        MPI_DISTRIBUTE_DFLT_DARG,
        MPI_DISTRIBUTE_DFLT_DARG
    };
    int array_psizes[4] = { 6, 3, 1, 1 };

    int i, rank, err, errs = 0, sizeoftype;

    for (rank = 0; rank < 18; rank++) {
        /* set up array */
        for (i = 0; i < 72; i++) {
            array[i] = i;
        }

        /* set up type */
        err = MPI_Type_create_darray(18,        /* size */
                                     rank, 4,   /* dims */
                                     array_size,
                                     array_distrib,
                                     array_dargs, array_psizes, MPI_ORDER_C, MPI_INT, &darray);
        if (err != MPI_SUCCESS) {
            errs++;
            if (verbose) {
                fprintf(stderr,
                        "error in MPI_Type_create_darray call; aborting after %d errors\n", errs);
            }
            MTestPrintError(err);
            return errs;
        }

        MPI_Type_commit(&darray);

        /* verify the size of the type */
        MPI_Type_size(darray, &sizeoftype);
        if (sizeoftype != 4 * sizeof(int)) {
            errs++;
            if (verbose)
                fprintf(stderr, "size of type = %d; should be %d\n",
                        sizeoftype, (int) (4 * sizeof(int)));
            return errs;
        }

        /* pack and unpack the type, zero'ing out all other values */
        err = pack_and_unpack((char *) array, 1, darray, 72 * sizeof(int));

        for (i = 0; i < 4 * rank; i++) {
            if (array[i] != 0) {
                errs++;
                if (verbose)
                    fprintf(stderr, "[4d array rank=%d]:array[%d] = %d; should be %d\n",
                            rank, i, array[i], 0);
            }
        }

        for (i = 4 * rank; i < 4 * rank + 4; i++) {
            if (array[i] != i) {
                errs++;
                if (verbose)
                    fprintf(stderr, "[4d array rank=%d]:array[%d] = %d; should be %d\n",
                            rank, i, array[i], i);
            }
        }
        for (i = 4 * rank + 4; i < 72; i++) {
            if (array[i] != 0) {
                errs++;
                if (verbose)
                    fprintf(stderr, "[4d array rank=%d]:array[%d] = %d; should be %d\n",
                            rank, i, array[i], 0);
            }
        }

        MPI_Type_free(&darray);
    }
    return errs;
}

/******************************************************************/

/* pack_and_unpack()
 *
 * Perform packing and unpacking of a buffer for the purposes of checking
 * to see if we are processing a type correctly.  Zeros the buffer between
 * these two operations, so the data described by the type should be in
 * place upon return but all other regions of the buffer should be zero.
 *
 * Parameters:
 * typebuf - pointer to buffer described by datatype and count that
 *           will be packed and then unpacked into
 * count, datatype - description of typebuf
 * typebufsz - size of typebuf; used specifically to zero the buffer
 *             between the pack and unpack steps
 *
 */
static int pack_and_unpack(char *typebuf, int count, MPI_Datatype datatype, int typebufsz)
{
    char *packbuf;
    int err, errs = 0, pack_size, type_size, position;

    err = MPI_Type_size(datatype, &type_size);
    if (err != MPI_SUCCESS) {
        errs++;
        if (verbose) {
            fprintf(stderr, "error in MPI_Type_size call; aborting after %d errors\n", errs);
        }
        MTestPrintError(err);
        return errs;
    }

    type_size *= count;

    err = MPI_Pack_size(count, datatype, MPI_COMM_SELF, &pack_size);
    if (err != MPI_SUCCESS) {
        errs++;
        if (verbose) {
            fprintf(stderr, "error in MPI_Pack_size call; aborting after %d errors\n", errs);
        }
        MTestPrintError(err);
        return errs;
    }
    packbuf = (char *) malloc(pack_size);
    if (packbuf == NULL) {
        errs++;
        if (verbose) {
            fprintf(stderr, "error in malloc call; aborting after %d errors\n", errs);
        }
        return errs;
    }

    /* FIXME: the pack size returned need not be the type_size - this will
     * only be true if the pack routine simply moves the bytes but does
     * no other transformations of the data */
    position = 0;
    err = MPI_Pack(typebuf, count, datatype, packbuf, type_size, &position, MPI_COMM_SELF);

    if (position != type_size) {
        errs++;
        if (verbose)
            fprintf(stderr, "position = %d; should be %d (pack)\n", position, type_size);
    }

    memset(typebuf, 0, typebufsz);
    position = 0;
    err = MPI_Unpack(packbuf, type_size, &position, typebuf, count, datatype, MPI_COMM_SELF);
    if (err != MPI_SUCCESS) {
        errs++;
        if (verbose) {
            fprintf(stderr, "error in MPI_Unpack call; aborting after %d errors\n", errs);
        }
        MTestPrintError(err);
        return errs;
    }
    free(packbuf);

    if (position != type_size) {
        errs++;
        if (verbose)
            fprintf(stderr, "position = %d; should be %d (unpack)\n", position, type_size);
    }

    return errs;
}

static int parse_args(int argc, char **argv)
{
    /*
     * int ret;
     *
     * while ((ret = getopt(argc, argv, "v")) >= 0)
     * {
     * switch (ret) {
     * case 'v':
     * verbose = 1;
     * break;
     * }
     * }
     */
    if (argc > 1 && strcmp(argv[1], "-v") == 0)
        verbose = 1;
    return 0;
}