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

#include "mpi.h"
#include <stdio.h>
#include <stdlib.h>
#include "mpitestconf.h"
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include <assert.h>
#include <limits.h>
#include "mpitest.h"

static int verbose = 1;

#define check(cond_)                                                                             \
    do {                                                                                         \
        if (!(cond_)) {                                                                          \
            if (verbose) {                                                                       \
                fprintf(stderr, "condition '%s' does not hold, at line %d\n", #cond_, __LINE__); \
            }                                                                                    \
            errs += 1;                                                                           \
        }                                                                                        \
    } while (0)

#define check_err(err_, what_failed_)                                                 \
    do {                                                                              \
        if (err_) {                                                                   \
            if (verbose) {                                                            \
                fprintf(stderr, "error: %s, at line %d\n", (what_failed_), __LINE__); \
            }                                                                         \
            errs += (err_);                                                           \
        }                                                                             \
    } while (0)

/* tests */
int indexed_contig_test(void);
int indexed_zeroblock_first_test(void);
int indexed_zeroblock_middle_test(void);
int indexed_zeroblock_last_test(void);
int indexed_contig_leading_zero_test(void);
int indexed_same_lengths(void);

/* helper functions */
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 = indexed_contig_test();
    if (err && verbose)
        fprintf(stderr, "%d errors in indexed_contig_test.\n", err);
    errs += err;

    err = indexed_zeroblock_first_test();
    if (err && verbose)
        fprintf(stderr, "%d errors in indexed_zeroblock_first_test.\n", err);
    errs += err;

    err = indexed_zeroblock_middle_test();
    if (err && verbose)
        fprintf(stderr, "%d errors in indexed_zeroblock_middle_test.\n", err);
    errs += err;

    err = indexed_zeroblock_last_test();
    if (err && verbose)
        fprintf(stderr, "%d errors in indexed_zeroblock_last_test.\n", err);
    errs += err;

    err = indexed_contig_leading_zero_test();
    if (err && verbose)
        fprintf(stderr, "%d errors in indexed_contig_leading_zero_test.\n", err);
    errs += err;

    err = indexed_same_lengths();
    if (err && verbose)
        fprintf(stderr, "%d errors in indexed_contig_leading_zero_test.\n", err);
    errs += err;

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

int indexed_zeroblock_first_test(void)
{
    int err, errs = 0;

    MPI_Datatype type;
    int len[3] = { 0, 1, 1 };
    int disp[3] = { 0, 1, 4 };
    MPI_Aint lb, ub, extent;

    err = MPI_Type_indexed(3, len, disp, MPI_INT, &type);
    if (err != MPI_SUCCESS) {
        if (verbose) {
            fprintf(stderr, "error creating indexed type in indexed_zeroblock_first_test()\n");
        }
        errs += 1;
    }

    MPI_Type_get_extent(type, &lb, &extent);
    if (lb != sizeof(int)) {
        if (verbose) {
            fprintf(stderr, "lb mismatch; is %d, should be %d\n", (int) lb, (int) sizeof(int));
        }
        errs++;
    }
    ub = lb + extent;
    if (ub != 5 * sizeof(int)) {
        if (verbose) {
            fprintf(stderr,
                    "ub mismatch; is %d, should be %d\n", (int) ub, (int) (5 * sizeof(int)));
        }
        errs++;
    }

    MPI_Type_free(&type);

    return errs;
}

int indexed_zeroblock_middle_test(void)
{
    int err, errs = 0;

    MPI_Datatype type;
    int len[3] = { 1, 0, 1 };
    int disp[3] = { 1, 2, 4 };
    MPI_Aint lb, ub, extent;

    err = MPI_Type_indexed(3, len, disp, MPI_INT, &type);
    if (err != MPI_SUCCESS) {
        if (verbose) {
            fprintf(stderr, "error creating indexed type in indexed_zeroblock_middle_test()\n");
        }
        errs += 1;
    }

    MPI_Type_get_extent(type, &lb, &extent);
    if (lb != sizeof(int)) {
        if (verbose) {
            fprintf(stderr, "lb mismatch; is %d, should be %d\n", (int) lb, (int) sizeof(int));
        }
        errs++;
    }
    ub = lb + extent;
    if (ub != 5 * sizeof(int)) {
        if (verbose) {
            fprintf(stderr,
                    "ub mismatch; is %d, should be %d\n", (int) ub, (int) (5 * sizeof(int)));
        }
        errs++;
    }

    MPI_Type_free(&type);

    return errs;
}

int indexed_zeroblock_last_test(void)
{
    int err, errs = 0;

    MPI_Datatype type;
    int len[3] = { 1, 1, 0 };
    int disp[3] = { 1, 4, 8 };
    MPI_Aint lb, ub, extent;

    err = MPI_Type_indexed(3, len, disp, MPI_INT, &type);
    if (err != MPI_SUCCESS) {
        if (verbose) {
            fprintf(stderr, "error creating indexed type in indexed_zeroblock_last_test()\n");
        }
        errs += 1;
    }

    MPI_Type_get_extent(type, &lb, &extent);
    if (lb != sizeof(int)) {
        if (verbose) {
            fprintf(stderr, "lb mismatch; is %d, should be %d\n", (int) lb, (int) sizeof(int));
        }
        errs++;
    }
    ub = lb + extent;
    if (ub != 5 * sizeof(int)) {
        if (verbose) {
            fprintf(stderr,
                    "ub mismatch; is %d, should be %d\n", (int) ub, (int) (5 * sizeof(int)));
        }
        errs++;
    }

    MPI_Type_free(&type);

    return errs;
}

/* indexed_contig_test()
 *
 * Tests behavior with an indexed array that can be compacted but should
 * continue to be stored as an indexed type.  Specifically for coverage.
 *
 * Returns the number of errors encountered.
 */
int indexed_contig_test(void)
{
    int buf[9] = { -1, 1, 2, 3, -2, 4, 5, -3, 6 };
    int err, errs = 0;

    int i, count = 5;
    int blklen[] = { 1, 2, 1, 1, 1 };
    int disp[] = { 1, 2, 5, 6, 8 };
    MPI_Datatype newtype;

    int size, int_size;

    err = MPI_Type_indexed(count, blklen, disp, MPI_INT, &newtype);
    if (err != MPI_SUCCESS) {
        if (verbose) {
            fprintf(stderr, "error creating indexed type in indexed_contig_test()\n");
        }
        errs++;
    }

    MPI_Type_size(MPI_INT, &int_size);

    err = MPI_Type_size(newtype, &size);
    if (err != MPI_SUCCESS) {
        if (verbose) {
            fprintf(stderr, "error obtaining type size in indexed_contig_test()\n");
        }
        errs++;
    }

    if (size != 6 * int_size) {
        if (verbose) {
            fprintf(stderr, "error: size != 6 * int_size in indexed_contig_test()\n");
        }
        errs++;
    }

    MPI_Type_commit(&newtype);

    err = pack_and_unpack((char *) buf, 1, newtype, 9 * sizeof(int));
    if (err != 0) {
        if (verbose) {
            fprintf(stderr, "error packing/unpacking in indexed_contig_test()\n");
        }
        errs += err;
    }

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

        switch (i) {
            case 1:
                goodval = 1;
                break;
            case 2:
                goodval = 2;
                break;
            case 3:
                goodval = 3;
                break;
            case 5:
                goodval = 4;
                break;
            case 6:
                goodval = 5;
                break;
            case 8:
                goodval = 6;
                break;
            default:
                goodval = 0;    /* pack_and_unpack() zeros before unpack */
                break;
        }
        if (buf[i] != goodval) {
            errs++;
            if (verbose)
                fprintf(stderr, "buf[%d] = %d; should be %d\n", i, buf[i], goodval);
        }
    }

    MPI_Type_free(&newtype);

    return errs;
}

/* very similar to indexed_zeroblock_first_test, but only has a single contig in
 * order to catch a particular optimization path in MPICH */
int indexed_contig_leading_zero_test(void)
{
    int err, errs = 0;

    int i;
    MPI_Datatype type = MPI_DATATYPE_NULL;
    MPI_Datatype struct_type = MPI_DATATYPE_NULL;
    MPI_Datatype types[2];
    int len[3] = { 0, 4, 0 };
    int disp[3] = { INT_MAX, 2, INT_MAX };
    MPI_Aint adisp[3];
    MPI_Aint lb, ub, extent;
    int *buf = NULL;

    err = MPI_Type_indexed(3, len, disp, MPI_INT, &type);
    check_err(err, "creating indexed type in indexed_contig_leading_zero_test()");
    err = MPI_Type_commit(&type);
    check_err(err, "committing indexed type in indexed_contig_leading_zero_test()");

    MPI_Type_get_extent(type, &lb, &extent);
    check(lb == 2 * sizeof(int));
    ub = lb + extent;
    check(ub == 6 * sizeof(int));

    /* make sure packing/unpacking works (hits a simple "is_contig" case in
     * MPICH's pack/unpack routines) */
    buf = malloc(10 * sizeof(int));
    assert(buf != NULL);
    for (i = 0; i < 10; ++i) {
        buf[i] = i + 1;
    }
    err = pack_and_unpack((char *) buf, 1, type, 10 * sizeof(int));
    check_err(err, "packing/unpacking in indexed_contig_leading_zero_test()");
    for (i = 0; i < 10; ++i) {
        int expected;
        if (i >= 2 && i < 6)
            expected = i + 1;
        else
            expected = 0;
        check(buf[i] == expected);
    }
    free(buf);

    /* -------------------------------------------------------------------- */
    /* A more rigorous test of the indexed type.  Use a hard-to-optimize struct
     * type to force a more complicated datatype processing path */
    len[0] = 1;
    len[1] = 1;
    adisp[0] = 0;
    adisp[1] = 8 * sizeof(int);
    types[0] = type;
    types[1] = MPI_INT;

    /* struct layout: xx0123xx4x ('x' indicates a hole), one char is an
     * MPI_INT */
    MPI_Type_create_struct(2, len, adisp, types, &struct_type);
    check_err(err, "creating struct type in indexed_contig_leading_zero_test()");
    err = MPI_Type_commit(&struct_type);
    check_err(err, "committing struct type in indexed_contig_leading_zero_test()");

    buf = malloc(10 * sizeof(int));
    assert(buf != NULL);
    for (i = 0; i < 10; ++i) {
        buf[i] = i + 1;
    }
    err = pack_and_unpack((char *) buf, 1, struct_type, 10 * sizeof(int));
    check_err(err, "packing/unpacking in indexed_contig_test()");

    for (i = 0; i < 10; ++i) {
        int expected;
        if ((i >= 2 && i < 6) || i == 8)
            expected = i + 1;
        else
            expected = 0;
        check(buf[i] == expected);
    }
    free(buf);

    MPI_Type_free(&struct_type);
    MPI_Type_free(&type);

    /* -------------------------------------------------------------------- */
    /* now do the same as above, but with hindexed */
    len[0] = 0;
    len[1] = 4;
    len[2] = 0;
    /* use *_MAX vars to improve our chances of hitting any pointer-casting
     * bugs in a big way (segfaults, etc.) */
    /* FIXME: This should also look at long, or use a different approach */
#if defined(HAVE_LONG_LONG) && defined(LLONG_MAX)
    if (sizeof(MPI_Aint) == sizeof(long long)) {
        adisp[0] = (MPI_Aint) LLONG_MAX;
        adisp[1] = 2 * sizeof(int);
        adisp[2] = (MPI_Aint) LLONG_MAX;
    } else
#endif
    {
        adisp[0] = (MPI_Aint) INT_MAX;
        adisp[1] = 2 * sizeof(int);
        adisp[2] = (MPI_Aint) INT_MAX;
    }

    err = MPI_Type_create_hindexed(3, len, adisp, MPI_INT, &type);
    check_err(err, "creating hindexed type in indexed_contig_leading_zero_test()");

    err = MPI_Type_commit(&type);
    check_err(err, "committing hindexed type in indexed_contig_leading_zero_test()");

    MPI_Type_get_extent(type, &lb, &extent);
    check(lb == 2 * sizeof(int));
    ub = lb + extent;
    check(ub == 6 * sizeof(int));

    buf = malloc(10 * sizeof(int));
    assert(buf != NULL);
    for (i = 0; i < 10; ++i) {
        buf[i] = i + 1;
    }
    err = pack_and_unpack((char *) buf, 1, type, 10 * sizeof(int));
    check_err(err, "packing/unpacking in indexed_contig_test()");

    for (i = 0; i < 10; ++i) {
        int expected;
        if (i >= 2 && i < 6)
            expected = i + 1;
        else
            expected = 0;
        check(buf[i] == expected);
    }
    free(buf);


    /* -------------------------------------------------------------------- */
    /* A more rigorous test of the hindexed type.  Use a hard-to-optimize struct
     * type to force a more complicated datatype processing path */
    len[0] = 1;
    len[1] = 1;
    adisp[0] = 0;
    adisp[1] = 8 * sizeof(int);

    /* struct layout: xx0123xx4x ('x' indicates a hole), one char is an
     * MPI_INT */
    err = MPI_Type_create_struct(2, len, adisp, types, &struct_type);
    check_err(err, "committing struct type in indexed_contig_leading_zero_test()");
    err = MPI_Type_commit(&struct_type);
    check_err(err, "committing struct type in indexed_contig_leading_zero_test()");

    buf = malloc(10 * sizeof(int));
    assert(buf != NULL);
    for (i = 0; i < 10; ++i) {
        buf[i] = i + 1;
    }
    /* fails in old MPICH (3.0rc1 and earlier), despite correct ub/lb
     * determination */
    err = pack_and_unpack((char *) buf, 1, struct_type, 10 * sizeof(int));
    check_err(err, "packing/unpacking in indexed_contig_test()");

    for (i = 0; i < 10; ++i) {
        int expected;
        if ((i >= 2 && i < 6) || i == 8)
            expected = i + 1;
        else
            expected = 0;
        check(buf[i] == expected);
    }
    free(buf);

    MPI_Type_free(&struct_type);
    MPI_Type_free(&type);

    return errs;
}

/* Test an indexed (and hindexed) type where the block length is the same for
 * all blocks, but with differing displacements so that it cannot directly be
 * converted to a vector type.  It is also important to add a dummy element at
 * the beginning in order to cause int/MPI_Aint misalignment for the
 * displacement of the first non-zero-width component. */
int indexed_same_lengths(void)
{
    int err, errs = 0;

    int i;
    MPI_Datatype type = MPI_DATATYPE_NULL;
    int len[4];
    int disp[4];
    MPI_Aint adisp[4];
    MPI_Aint lb, ub, extent;
    int *buf = NULL;

    len[0] = 0;
    len[1] = 1;
    len[2] = 1;
    len[3] = 1;

    disp[0] = 0;
    disp[1] = 1;
    disp[2] = 3;
    disp[3] = 8;

    err = MPI_Type_indexed(4, len, disp, MPI_INT, &type);
    check_err(err, "creating indexed type in indexed_same_lengths()");
    err = MPI_Type_commit(&type);
    check_err(err, "committing indexed type in indexed_same_lengths()");

    MPI_Type_get_extent(type, &lb, &extent);
    check(lb == 1 * sizeof(int));
    ub = lb + extent;
    check(ub == 9 * sizeof(int));

    buf = malloc(10 * sizeof(int));
    assert(buf != NULL);
    for (i = 0; i < 10; ++i) {
        buf[i] = i + 1;
    }
    err = pack_and_unpack((char *) buf, 1, type, 10 * sizeof(int));
    check_err(err, "packing/unpacking in indexed_same_lengths()");
    for (i = 0; i < 10; ++i) {
        int expected;
        if (i == 1 || i == 3 || i == 8)
            expected = i + 1;
        else
            expected = 0;
        check(buf[i] == expected);
    }
    free(buf);

    MPI_Type_free(&type);

    /* -------------------------------------------------------------------- */
    /* now do the same as above, but with hindexed */
    len[0] = 0;
    len[1] = 1;
    len[2] = 1;
    len[3] = 1;

    adisp[0] = 0 * sizeof(int);
    adisp[1] = 1 * sizeof(int);
    adisp[2] = 3 * sizeof(int);
    adisp[3] = 8 * sizeof(int);

    err = MPI_Type_create_hindexed(4, len, adisp, MPI_INT, &type);
    check_err(err, "creating hindexed type in indexed_same_lengths()");
    err = MPI_Type_commit(&type);
    check_err(err, "committing hindexed type in indexed_same_lengths()");

    MPI_Type_get_extent(type, &lb, &extent);
    check(lb == 1 * sizeof(int));
    ub = lb + extent;
    check(ub == 9 * sizeof(int));

    buf = malloc(10 * sizeof(int));
    assert(buf != NULL);
    for (i = 0; i < 10; ++i) {
        buf[i] = i + 1;
    }
    err = pack_and_unpack((char *) buf, 1, type, 10 * sizeof(int));
    check_err(err, "packing/unpacking in indexed_same_lengths()");
    for (i = 0; i < 10; ++i) {
        int expected;
        if (i == 1 || i == 3 || i == 8)
            expected = i + 1;
        else
            expected = 0;
        check(buf[i] == expected);
    }
    free(buf);

    MPI_Type_free(&type);

    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);
        }
        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);
        }
        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;
    }

    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);
        }
        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;
}

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;
}
