/*
 * (C) Copyright 2005- ECMWF.
 *
 * This software is licensed under the terms of the Apache Licence Version 2.0
 * which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
 *
 * In applying this licence, ECMWF does not waive the privileges and immunities granted to it by
 * virtue of its status as an intergovernmental organisation nor does it submit to any jurisdiction.
 */

#include "grib_tools.h"

grib_option grib_options[] = {
    /*  {id, args, help}, on, command_line, value*/
    /*{"r",0,"Compare files in which the messages are not in the same order. This option is time expensive.\n",0,1,0},*/
    { "b:", 0, 0, 0, 1, 0 },
    { "d", 0, "Write different messages on files.\n", 0, 1, 0 },
    { "2", 0, "Enable two-way comparison.\n", 0, 1, 0 },
    { "T:", 0, 0, 1, 0, "B" },
    { "c:", 0, 0, 0, 1, 0 },
    { "S:", "start", "First field to be processed.\n", 0, 1, 0 },
    { "E:", "end", "Last field to be processed.\n", 0, 1, 0 },
    { "a", 0, "-c option modifier. The keys listed with the option -c will be added to the list of keys compared without -c.\n", 0, 1, 0 },
    { "H", 0, "Compare only message headers. Bit-by-bit compare on. Incompatible with -c option.\n", 0, 1, 0 },
    { "R:", 0, 0, 0, 1, 0 },
    { "A:", 0, 0, 0, 1, 0 },
    { "t:", "factor", "Compare data values using factor multiplied by the tolerance specified in options -R -A.\n", 0, 1, 0 },
    { "w:", 0, 0, 0, 1, 0 },
    { "f", 0, "Forcefully compare, do not stop after first difference.\n", 0, 1, 0 },
    { "F", 0, 0, 1, 0, 0 },
    { "q", 0, 0, 1, 0, 0 },
    { "M", 0, 0, 1, 0, 0 },
    { "I", 0, 0, 1, 0, 0 },
    { "V", 0, 0, 0, 1, 0 },
    { "7", 0, 0, 0, 1, 0 },
    { "v", 0, 0, 0, 1, 0 },
    { "h", 0, 0, 0, 1, 0 },
};

int grib_options_count = sizeof(grib_options) / sizeof(grib_option);

const char* tool_description =
    "Compare BUFR messages contained in two files."
    "\n\tIf some differences are found it fails returning an error code."
    "\n\tFloating-point values are compared exactly by default, different tolerances can be defined (see -A -R)."
    "\n\tDefault behaviour: absolute error=0, bit-by-bit compare, same order in files.";

const char* tool_name       = "bufr_compare";
const char* tool_online_doc = "https://confluence.ecmwf.int/display/ECC/bufr_compare";
const char* tool_usage      = "[options] bufr_file1 bufr_file2";

typedef double (*compare_double_proc)(const double*, const double*, const double*);

typedef struct grib_error grib_error;
struct grib_error
{
    char* key;
    int count;
    grib_error* next;
};

static grib_error* error_summary;
static compare_double_proc compare_double;
static double global_tolerance     = 0;
static grib_string_list* blocklist = 0;
static grib_string_list* keys_list = NULL; /* Used to determine rank of key */
static int isLeafKey               = 0;    /* 0 if key is top-level, 1 if key has no children attributes */
static int compareAbsolute         = 1;

static int compare_handles(grib_handle* handle1, grib_handle* handle2, grib_runtime_options* options);
static int compare_attribute(grib_handle* handle1, grib_handle* handle2, grib_runtime_options* options,
                             grib_accessor* a, const char* prefix, int* err);

static int error     = 0;
static int count     = 0;
static int force     = 0;

/* ECC-651: Boolean 'two_way' set to 1 when '-2' option used */
static int two_way = 0;
/* Boolean 'handles_swapped' relevant in 'two_way' mode:
 *  0 means: h1 is first file,  h2 is second file
 *  1 means: h1 is second file, h2 is first file
 */
static int handles_swapped = 0;

static double maxAbsoluteError = 1e-19;
static int onlyListed          = 1;
static int headerMode          = 0;
static int morein1             = 0;
static int morein2             = 0;
static int listFromCommandLine = 0;
static int verbose             = 0;
static double tolerance_factor = 1;
static int write_error         = 0;
static int write_count         = 0;

static grib_handle* global_handle = NULL;
static int counter                = 0;
static int start                  = -1;
static int end                    = -1;

/* Create the list of keys (global variable keys_list) */
static void new_keys_list()
{
    grib_context* c = grib_context_get_default();
    keys_list       = (grib_string_list*)grib_context_malloc_clear(c, sizeof(grib_string_list));
    if (!keys_list) {
        fprintf(stderr, "%s: Failed to allocate memory for keys list", tool_name);
        exit(1);
    }
}

/* Free the keys list (global variable keys_list) */
static void release_keys_list()
{
    grib_string_list* next = keys_list;
    grib_string_list* cur  = NULL;
    grib_context* c        = grib_context_get_default();
    while (next) {
        cur  = next;
        next = next->next;
        grib_context_free(c, cur->value);
        grib_context_free(c, cur);
    }
}

GRIB_INLINE static double compare_double_absolute(const double* a, const double* b, const double* err)
{
    double ret = 0;
    double d   = fabs(*a - *b);
    if (d > *err) {
        ret = d;
    }
    return ret;
    /* return fabs(*a-*b) > *err ? fabs(*a-*b) : 0; */
}

static void write_message(grib_handle* h, const char* str)
{
    const void* m;
    size_t s;
    char fname[1024] = {0,};
    FILE* fh;

    grib_get_message(h, &m, &s);
    snprintf(fname, sizeof(fname), "%s_%d.bufr", str, write_count);

    fh = fopen(fname, "w");
    if (!fh) {
        grib_context_log(h->context, (GRIB_LOG_ERROR) | (GRIB_LOG_PERROR),
                         "Error opening %s", fname);
        exit(GRIB_IO_PROBLEM);
    }

    if (fwrite(m, 1, s, fh) != s) {
        grib_context_log(h->context, (GRIB_LOG_ERROR) | (GRIB_LOG_PERROR),
                         "Error writing to %s", fname);
        exit(GRIB_IO_PROBLEM);
    }

    fclose(fh);
}

static void write_messages(grib_handle* handle1, grib_handle* handle2)
{
    if (!write_error)
        return;
    write_count++;

    write_message(handle1, "error1");
    write_message(handle2, "error2");
}

static double compare_double_relative(const double* a, const double* b, const double* err)
{
    double relativeError;

    if (fabs(*a) <= maxAbsoluteError || fabs(*b) <= maxAbsoluteError)
        relativeError = fabs(*a - *b);
    else if (fabs(*b) > fabs(*a))
        relativeError = fabs((*a - *b) / *b);
    else
        relativeError = fabs((*a - *b) / *a);

    return relativeError > *err ? relativeError : 0;
}

static int blocklisted(const char* name)
{
    grib_string_list* b = blocklist;
    if (!name) return 0;
    while (b) {
        ECCODES_ASSERT(b->value);
        if (!strcmp(name, b->value))
            return 1;
        b = b->next;
    }
    return 0;
}

static double relative_error(double a, double b, double err)
{
    double relativeError;

    if (fabs(a) <= maxAbsoluteError || fabs(b) <= maxAbsoluteError)
        relativeError = fabs(a - b);
    else if (fabs(b) > fabs(a))
        relativeError = fabs((a - b) / b);
    else
        relativeError = fabs((a - b) / a);

    return relativeError;
}

int main(int argc, char* argv[])
{
    return grib_tool(argc, argv);
}

int grib_tool_before_getopt(grib_runtime_options* options)
{
    return 0;
}

int grib_tool_init(grib_runtime_options* options)
{
    int ret = 0;
    grib_context* context = grib_context_get_default();

    options->strict = 1;
    if (grib_options_on("S:"))
        start = atoi(grib_options_get_option("S:"));

    if (grib_options_on("E:"))
        end = atoi(grib_options_get_option("E:"));

    if (grib_options_on("f"))
        force = 1;
    else
        force = 0;

    if (grib_options_on("2"))
        two_way = 1;
    else
        two_way = 0;

    if (grib_options_on("d"))
        write_error = 1;
    else
        write_error = 0;

    verbose = grib_options_on("v");

    listFromCommandLine = 0;
    if (grib_options_on("c:") || grib_options_on("e"))
        listFromCommandLine = 1;

    if (grib_options_on("a"))
        onlyListed = 0;
    else
        onlyListed = 1;

    if (grib_options_on("H"))
        headerMode = 1;
    else
        headerMode = 0;

    if (grib_options_on("H") && grib_options_on("c:")) {
        fprintf(stderr, "%s: -H and -c options are incompatible. Choose one of the two please.\n",tool_name);
        exit(1);
    }
    if (grib_options_on("a") && !grib_options_on("c:")) {
        fprintf(stderr, "%s: -a option requires -c option. Please define a list of keys with the -c option.\n",tool_name);
        exit(1);
    }

    if (grib_options_on("b:")) {
        grib_string_list* next = 0;
        int ii                 = 0;
        blocklist              = (grib_string_list*)grib_context_malloc_clear(context, sizeof(grib_string_list));
        blocklist->value       = grib_context_strdup(context, options->set_values[0].name);
        next                   = blocklist;
        for (ii = 1; ii < options->set_values_count; ii++) {
            next->next        = (grib_string_list*)grib_context_malloc_clear(context, sizeof(grib_string_list));
            next->next->value = grib_context_strdup(context, options->set_values[ii].name);
            next              = next->next;
        }
        context->blocklist = blocklist;
    }

    /* Check 1st file is not a directory */
    exit_if_input_is_directory(tool_name, options->infile_extra->name);

    options->random             = 0;
    options->infile_extra->file = fopen(options->infile_extra->name, "r");

    if (!options->infile_extra->file) {
        perror(options->infile_extra->name);
        exit(1);
    }

    global_tolerance = 0;
    compare_double   = &compare_double_absolute;
    if (grib_options_on("R:")) {
        global_tolerance = 0;
        compare_double  = &compare_double_relative;
        compareAbsolute = 0;
    }
    if (grib_options_on("A:")) {
        if (grib_options_on("R:")) {
            maxAbsoluteError = atof(grib_options_get_option("A:"));
        }
        else {
            compare_double   = &compare_double_absolute;
            global_tolerance = atof(grib_options_get_option("A:"));
        }
    }

    if (grib_options_on("t:"))
        tolerance_factor = atof(grib_options_get_option("t:"));

    if (grib_options_on("R:")) {
        char* sarg = grib_options_get_option("R:");
        options->tolerance_count = MAX_KEYS;
        ret = parse_keyval_string(tool_name, sarg, 1, GRIB_TYPE_DOUBLE, options->tolerance, &(options->tolerance_count));
        if (ret == GRIB_INVALID_ARGUMENT) {
            usage();
            exit(1);
        }
    }

    {
        /* Check for 2nd file being a directory. If so, we assume user is comparing to a file */
        /* with the same name as first file in that directory */
        grib_tools_file* infile = options->infile; /* the 2nd file in comparison */
        if (infile) {
            if (path_is_directory(infile->name)) {
                /* Take the filename of the 1st file and append to dir */
                char bufr[2048] = {0,};
                /* options->infile_extra->name_ is the 1st file */
                snprintf(bufr, sizeof(bufr), "%s%c%s",
                        infile->name,
                        get_dir_separator_char(),
                        extract_filename(options->infile_extra->name));
                infile->name = strdup(bufr);
            }
        }
    }

    /* Turn off GRIB multi-field support mode. Not relevant for BUFR */
    grib_multi_support_off(grib_context_get_default());

    return 0;
}

int grib_tool_new_filename_action(grib_runtime_options* options, const char* file)
{
    return 0;
}

int grib_tool_new_file_action(grib_runtime_options* options, grib_tools_file* file)
{
    exit_if_input_is_directory(tool_name, file->name);
    return 0;
}

static void printInfo(grib_handle* h)
{
    printf("== %d == DIFFERENCE == ", count);
}

static void print_index_key_values(grib_index* index, int icounter, const char* error_message)
{
    grib_index_key* keys = index->keys;
    printf("== %d == ", icounter);
    if (error_message)
        printf("%s == ", error_message);
    while (keys) {
        printf("%s=%s ", keys->name, keys->value);
        keys = keys->next;
    }
    printf("\n");
}

static grib_handle* bufr_handle_new_from_file_x(
    grib_context* c, FILE* f, int mode, int headers_only, int* err)
{
    return codes_handle_new_from_file(c, f, PRODUCT_BUFR, err);
}

int grib_tool_new_handle_action(grib_runtime_options* options, grib_handle* h)
{
    int err = 0;
    count++;

    if (options->through_index) {
        grib_index* idx1 = options->index1;
        verbose          = 0;
        counter++;

        if (start > 0 && counter < start)
            return 0;
        if (end > 0 && counter > end) {
            options->stop = 1;
            return 0;
        }

        grib_index_search_same(idx1, h);
        global_handle = codes_new_from_index(idx1, CODES_BUFR, &err);
        if (options->verbose) {
            off_t offset   = 0;
            char* filename = grib_get_field_file(options->index2, &offset);
            printf("file1=\"%s\" ", filename);
            filename = grib_get_field_file(options->index1, &offset);
            printf("file2=\"%s\" \n", filename);
            print_index_key_values(options->index1, counter, NULL);
        }

        if (!global_handle) {
            if (!options->verbose)
                print_index_key_values(idx1, counter, "NOT FOUND ");
        }

        if (!global_handle || err != GRIB_SUCCESS) {
            morein1++;
            if (global_handle)
                grib_handle_delete(global_handle);
            return 0;
        }

        if (compare_handles(h, global_handle, options)) {
            error++;
            write_messages(h, global_handle);
            if (!force)
                exit(1);
        }

        grib_handle_delete(global_handle);

        return 0;
    }
    else {
        global_handle = bufr_handle_new_from_file_x(h->context, options->infile_extra->file, options->mode, 0, &err);
    }

    if (!global_handle || err != GRIB_SUCCESS) {
        morein2++;
        if (global_handle)
            grib_handle_delete(global_handle);
        return 0;
    }

    if (compare_handles(global_handle, h, options)) {
        error++;
        write_messages(global_handle, h);
        if (!two_way) {
            /* If two_way mode: Don't exit yet. Show further differences */
            if (!force)
                exit(1);
        }
    }
    if (two_way) {
        /* ECC-651 and ECC-431 */
        handles_swapped = 1;
        if (verbose)
            printf("  Swapping handles (two-way mode)\n");
        if (compare_handles(h, global_handle, options)) {
            error++;
            write_messages(h, global_handle);
            if (!force)
                exit(1);
        }
        else {
            if (error) {
                /* Error from first pass */
                if (!force)
                    exit(1);
            }
        }
    }

    grib_handle_delete(global_handle);

    return 0;
}

int grib_tool_skip_handle(grib_runtime_options* options, grib_handle* h)
{
    int err = 0;
    if (!options->through_index) {
        global_handle = codes_bufr_handle_new_from_file(h->context, options->infile_extra->file, &err);

        if (!global_handle || err != GRIB_SUCCESS)
            morein2++;

        grib_handle_delete(global_handle);
    }

    grib_handle_delete(h);
    count++;

    return 0;
}

int grib_tool_finalise_action(grib_runtime_options* options)
{
    grib_error* e   = error_summary;
    int err         = 0;
    grib_context* c = grib_context_get_default();

    /*if (grib_options_on("w:")) return 0;*/

    while ((global_handle = codes_bufr_handle_new_from_file(c, options->infile_extra->file, &err))) {
        morein1++;
        grib_handle_delete(global_handle);
    }

    error += morein1 + morein2;
    if (error) {
        printf("\n## ERRORS SUMMARY #######\n");
    }

    if (morein1 > 0) {
        printf("##\n## Different number of messages \n");
        printf("## %d more messages in %s than in %s\n", morein1,
               options->infile_extra->name, options->infile->name);
    }

    if (morein2 > 0) {
        printf("##\n## Different number of messages \n");
        printf("## %d more messages in %s than in %s\n", morein2,
               options->infile->name, options->infile_extra->name);
    }

    if (error) {
        printf("##\n## Summary of different key values \n");
        while (e) {
            printf("## %s ( %d different )\n", e->key, e->count);
            e = e->next;
        }

        printf("##\n## %d different messages out of %d\n\n", error, count);
    }
    if (options->through_index) {
        grib_index_delete(options->index1);
        grib_index_delete(options->index2);
    }
    release_keys_list();
    if (error != 0)
        exit(1);
    return 0;
}

static void save_error(grib_context* c, const char* key)
{
    grib_error* e    = 0;
    grib_error* next = 0;
    int saved        = 0;

    if (!error_summary) {
        error_summary        = (grib_error*)grib_context_malloc_clear(c, sizeof(grib_error));
        error_summary->count = 1;
        error_summary->key   = grib_context_strdup(c, key);
        return;
    }

    e    = error_summary;
    next = e;

    while (next) {
        if (!strcmp(next->key, key)) {
            next->count++;
            saved = 1;
            break;
        }
        e    = next;
        next = next->next;
    }

    if (!saved) {
        e->next        = (grib_error*)grib_context_malloc_clear(c, sizeof(grib_error));
        e->next->count = 1;
        e->next->key   = grib_context_strdup(c, key);
    }
}

static char* double_as_string(grib_context* c, double v)
{
    char* sval = (char*)grib_context_malloc_clear(c, sizeof(char) * 40);
    if (v == GRIB_MISSING_DOUBLE)
        snprintf(sval, 32, "MISSING");
    else
        snprintf(sval, 32, "%.20e", v);
    return sval;
}

/* Return the part of the key name without the '#rank#' part */
static char* get_keyname_without_rank(const char* name)
{
    const char* p = name;
    char* pEnd;
    char* ret = NULL;

    if (*p == '#') {
        strtol(++p, &pEnd, 10);
        if (*pEnd != '#') {
            DEBUG_ASSERT(!"Badly formed rank in key");
        }
        else {
            /* Take everything after 2nd '#' */
            grib_context* c = grib_context_get_default();
            pEnd++;
            ret = grib_context_strdup(c, pEnd);
        }
    }
    return ret;
}

static int are_strings_both_missing(grib_handle* h1, grib_handle* h2, const char* key,
                                    const char* s1, const char* s2,
                                    size_t slen1, size_t slen2)
{
    /* Note: one string could have all its bits=1 and the other empty */
    int is_miss_1 = 0, is_miss_2 = 0;
    if (strlen(s1) == 0) {
        is_miss_1 = 1;
    }
    else {
        grib_accessor* a1 = grib_find_accessor(h1, key);
        is_miss_1         = grib_is_missing_string(a1, (unsigned char*)s1, slen1);
    }
    if (strlen(s2) == 0) {
        is_miss_2 = 1;
    }
    else {
        grib_accessor* a2 = grib_find_accessor(h2, key);
        is_miss_2         = grib_is_missing_string(a2, (unsigned char*)s2, slen2);
    }
    if (is_miss_1 && is_miss_2) {
        return 1; /* both classed as missing */
    }
    return 0;
}

static int strings_are_different(grib_handle* h1, grib_handle* h2, const char* key,
                                 const char* s1, const char* s2,
                                 size_t slen1, size_t slen2)
{
    if (strcmp(s1, s2) == 0) {
        return 0;
    }
    /* Strings are different. Now check if strings are 'missing'.
     * Note: one string could have all its bits=1 and the other empty */
    if (are_strings_both_missing(h1, h2, key, s1, s2, slen1, slen2)) {
        return 0;
    }
    return 1;
}

static int compare_values(grib_runtime_options* options, grib_handle* handle1, grib_handle* handle2, const char* name, int type)
{
    size_t len1 = 0;
    size_t len2 = 0;
    int err = 0, i = 0;
    int err1;
    int err2;
    int type1, type2;
    int countdiff;
    int isMissing1 = 0, isMissing2 = 0;

    char *sval1 = NULL, *sval2 = NULL;
    char **svals1 = NULL, **svals2 = NULL;
    double *dval1 = NULL, *dval2 = NULL;
    long *lval1 = NULL, *lval2 = NULL;
    double maxdiff       = 0;
    double value_tolerance = 0;
    grib_context* c        = handle1->context;
    const char* first_str  = (handles_swapped == 0 ? "1st" : "2nd");
    const char* second_str = (handles_swapped == 0 ? "2nd" : "1st");

    type1 = type;
    type2 = type;
    if (verbose && !handles_swapped)
        printf("  comparing %s", name);

    if (type1 == GRIB_TYPE_UNDEFINED && (err = grib_get_native_type(handle1, name, &type1)) != GRIB_SUCCESS) {
        printInfo(handle1);
        printf("Error: cannot get type of [%s] in %s field: %s\n", name, first_str, grib_get_error_message(err));
        save_error(c, name);
        return err;
    }

    if (type2 == GRIB_TYPE_UNDEFINED && (err = grib_get_native_type(handle2, name, &type2)) != GRIB_SUCCESS) {
        if (err == GRIB_NOT_FOUND) {
            printInfo(handle1);
            printf("[%s] not found in %s field\n", name, second_str);
            save_error(c, name);
            return err;
        }
        printInfo(handle1);
        printf("Error: cannot get type of [%s] in %s field: %s\n", name, second_str, grib_get_error_message(err));
        save_error(c, name);
        return err;
    }

    /* if(type1 != type2) {
         printInfo(handle1);
         printf("Warning, [%s] has different types: 1st field: [%s], 2nd field: [%s]\n",
           name,grib_get_type_name(type1),grib_get_type_name(type2));
         return GRIB_TYPE_MISMATCH;
    } */

    if (type1 == GRIB_TYPE_LABEL)
        return err;

    if (type1 == GRIB_TYPE_SECTION)
        return err;

    if ((err = grib_get_size(handle1, name, &len1)) != GRIB_SUCCESS) {
        printInfo(handle1);
        printf("Error: cannot get size of [%s] in %s field: %s\n", name, first_str, grib_get_error_message(err));
        save_error(c, name);
        return err;
    }

    if ((err = grib_get_size(handle2, name, &len2)) != GRIB_SUCCESS) {
        if (err == GRIB_NOT_FOUND) {
            printInfo(handle1);
            printf("[%s] not found in %s field\n", name, second_str);
            save_error(c, name);
            return err;
        }

        printInfo(handle1);
        printf("Error: cannot get size of [%s] in %s field: %s\n", name, second_str, grib_get_error_message(err));
        save_error(c, name);
        return err;
    }

    if (handles_swapped) {
        /* Comparing a second time with handles swapped. Do not compare keys common to both handles */
        return GRIB_SUCCESS;
    }
    /* if(len1 != len2 && type1 != GRIB_TYPE_STRING) {
          printInfo(handle1);
          printf("[%s] has different size: 1st field: %ld, 2nd field: %ld\n",name,(long)len1,(long)len2);
          save_error(c,name);
          return GRIB_COUNT_MISMATCH;
        } */

    ECCODES_ASSERT(options->mode == MODE_BUFR);
        /* TODO: Ignore missing values for keys in BUFR. Not yet implemented */
        //isMissing1 = ((grib_is_missing(handle1, name, &err1) == 1) && (err1 == 0)) ? 1 : 0;
        //isMissing2 = ((grib_is_missing(handle2, name, &err2) == 1) && (err2 == 0)) ? 1 : 0;

    if ((isMissing1 == 1) && (isMissing2 == 1)) {
        // if (verbose) printf(" is set to missing in both fields\n");
        return GRIB_SUCCESS;
    }

    if (isMissing1 == 1) {
        // if (verbose) printf(" is set to missing in %s field\n", first_str);
        printInfo(handle1);
        printf("%s is set to missing in %s field is not missing in %s field\n", name, first_str, second_str);
        err1 = GRIB_VALUE_MISMATCH;
        save_error(c, name);
        return GRIB_VALUE_MISMATCH;
    }

    if (isMissing2 == 1) {
        // if (verbose) printf(" is set to missing in %s field\n", first_str);
        printInfo(handle1);
        printf("%s is set to missing in %s field is not missing in %s field\n", name, second_str, first_str);
        err1 = GRIB_VALUE_MISMATCH;
        save_error(c, name);
        return GRIB_VALUE_MISMATCH;
    }

    switch (type1) {
        case GRIB_TYPE_STRING:
            if (verbose)
                printf(" as string\n");

            if (len1 == len2 && len1 == 1) {
                /* Single string */
                size_t slen1 = 0;
                size_t slen2 = 0;
                /* See ECC-710: It is very slow getting the key length this way */
                /*grib_get_string_length(handle1,name,&slen1);*/
                /*grib_get_string_length(handle2,name,&slen2);*/
                slen1 = slen2 = 4096; /* Significantly faster to use an upper bound */
                sval1         = (char*)grib_context_malloc(handle1->context, slen1 * sizeof(char));
                sval2         = (char*)grib_context_malloc(handle2->context, slen2 * sizeof(char));
                if ((err1 = grib_get_string(handle1, name, sval1, &slen1)) != GRIB_SUCCESS) {
                    printInfo(handle1);
                    printf("Error: cannot get string value of [%s] in %s field: %s\n",
                           name, first_str, grib_get_error_message(err1));
                    save_error(c, name);
                }
                if ((err2 = grib_get_string(handle2, name, sval2, &slen2)) != GRIB_SUCCESS) {
                    printInfo(handle1);
                    printf("Error: cannot get string value of [%s] in %s field: %s\n",
                           name, second_str, grib_get_error_message(err2));
                    save_error(c, name);
                }
                if (err1 == GRIB_SUCCESS && err2 == GRIB_SUCCESS) {
                    if (strings_are_different(handle1, handle2, name, sval1, sval2, slen1, slen2)) {
                        printInfo(handle1);
                        printf("string [%s]: [%s] != [%s]\n", name, sval1, sval2);
                        err1 = GRIB_VALUE_MISMATCH;
                        save_error(c, name);
                    }
                }
                grib_context_free(handle1->context, sval1);
                grib_context_free(handle2->context, sval2);
            }
            else {
                /* Array of strings */
                size_t ii = 0;
                svals1   = (char**)grib_context_malloc_clear(handle1->context, len1 * sizeof(char*));
                svals2   = (char**)grib_context_malloc_clear(handle2->context, len2 * sizeof(char*));

                if ((err1 = grib_get_string_array(handle1, name, svals1, &len1)) != GRIB_SUCCESS) {
                    printInfo(handle1);
                    printf("Error: cannot get string value of [%s] in %s field: %s\n",
                           name, first_str, grib_get_error_message(err1));
                    save_error(c, name);
                }
                if ((err2 = grib_get_string_array(handle2, name, svals2, &len2)) != GRIB_SUCCESS) {
                    printInfo(handle1);
                    printf("Error: cannot get string value of [%s] in %s field: %s\n",
                           name, second_str, grib_get_error_message(err2));
                    save_error(c, name);
                }

                if (err1 == GRIB_SUCCESS && err2 == GRIB_SUCCESS && len1 != len2) {
                    printInfo(handle1);
                    printf("Different size for \"%s\"  [%zu]  [%zu]\n", name, len1, len2);
                    err1 = GRIB_INTERNAL_ERROR;
                    save_error(c, name);
                }
                if (err1 == GRIB_SUCCESS && err2 == GRIB_SUCCESS && len1 == len2) {
                    countdiff = 0;
                    for (ii = 0; ii < len1; ii++) {
                        if (strings_are_different(handle1, handle2, name, svals1[ii], svals2[ii], len1, len2)) {
                            countdiff++;
                        }
                    }
                    if (countdiff) {
                        printInfo(handle1);
                        save_error(c, name);
                        err1 = GRIB_VALUE_MISMATCH;
                        if (len1 == 1)
                            printf("string [%s]: [%s] != [%s]\n", name, *svals1, *svals2);
                        else
                            printf("string [%s] %d out of %zu different\n", name, countdiff, len1);
                    }
                }
                for (ii = 0; ii < len1; ++ii) grib_context_free(c, svals1[ii]);
                for (ii = 0; ii < len2; ++ii) grib_context_free(c, svals2[ii]);
                grib_context_free(handle1->context, svals1);
                grib_context_free(handle1->context, svals2);
            }
            if (err1)
                return err1;
            if (err2)
                return err2;

            break;

        case GRIB_TYPE_LONG:
            if (verbose)
                printf(" as long\n");

            lval1 = (long*)grib_context_malloc(handle1->context, len1 * sizeof(long));
            lval2 = (long*)grib_context_malloc(handle2->context, len2 * sizeof(long));

            if ((err1 = grib_get_long_array(handle1, name, lval1, &len1)) != GRIB_SUCCESS) {
                printInfo(handle1);
                printf("Error: cannot get long value of [%s] in %s field: %s\n",
                       name, first_str, grib_get_error_message(err1));
                save_error(c, name);
            }

            if ((err2 = grib_get_long_array(handle2, name, lval2, &len2)) != GRIB_SUCCESS) {
                printInfo(handle1);
                printf("Error: cannot get long value of [%s] in %s field: %s\n",
                       name, second_str, grib_get_error_message(err2));
                save_error(c, name);
            }

            if (err1 == GRIB_SUCCESS && err2 == GRIB_SUCCESS && len1 != len2) {
                printInfo(handle1);
                printf("Different size for \"%s\"  [%zu]  [%zu]\n", name, len1, len2);
                err1 = GRIB_INTERNAL_ERROR;
                save_error(c, name);
            }
            if (err1 == GRIB_SUCCESS && err2 == GRIB_SUCCESS && len1 == len2) {
                size_t ii;
                countdiff = 0;
                for (ii = 0; ii < len1; ii++)
                    if (lval1[ii] != lval2[ii])
                        countdiff++;

                if (countdiff) {
                    printInfo(handle1);
                    save_error(c, name);
                    err1 = GRIB_VALUE_MISMATCH;
                    if (len1 == 1)
                        printf("long [%s]: [%ld] != [%ld]\n", name, *lval1, *lval2);
                    else
                        printf("long [%s] %d out of %zu different\n", name, countdiff, len1);
                }
            }

            grib_context_free(handle1->context, lval1);
            grib_context_free(handle2->context, lval2);

            if (err1)
                return err1;
            if (err2)
                return err2;
            break;

        case GRIB_TYPE_DOUBLE:
            if (verbose)
                printf(" as double\n");
            dval1 = (double*)grib_context_malloc(handle1->context, len1 * sizeof(double));
            dval2 = (double*)grib_context_malloc(handle2->context, len2 * sizeof(double));

            value_tolerance = global_tolerance;

            if (!compareAbsolute) {
                int all_specified = 0; /* =1 if relative comparison with "all" specified */
                for (i = 0; i < options->tolerance_count; i++) {
                    if (!strcmp((options->tolerance[i]).name, "all")) {
                        all_specified   = 1;
                        value_tolerance = (options->tolerance[i]).double_value;
                        break;
                    }
                }
                if (!all_specified) {
                    char* basename = NULL;
                    for (i = 0; i < options->tolerance_count; i++) {
                        if (strcmp((options->tolerance[i]).name, name) == 0) {
                            value_tolerance = (options->tolerance[i]).double_value;
                            break;
                        }
                        else {
                            /* Check if the key without its rank has a relative tolerance */
                            basename = get_keyname_without_rank(name);
                            if (basename && strcmp((options->tolerance[i]).name, basename) == 0) {
                                value_tolerance = (options->tolerance[i]).double_value;
                                break;
                            }
                        }
                    }
                    if (basename)
                        grib_context_free(handle1->context, basename);
                }
            }

            if ((err1 = grib_get_double_array(handle1, name, dval1, &len1)) != GRIB_SUCCESS) {
                printInfo(handle1);
                printf("Error: cannot get double value of [%s] in %s field: %s\n",
                       name, first_str, grib_get_error_message(err1));
                save_error(c, name);
            }

            if ((err2 = grib_get_double_array(handle2, name, dval2, &len2)) != GRIB_SUCCESS) {
                printInfo(handle1);
                printf("Error: cannot get double value of [%s] in %s field: %s\n",
                       name, second_str, grib_get_error_message(err2));
                save_error(c, name);
            }

            if (err1 == GRIB_SUCCESS && err2 == GRIB_SUCCESS && len1 != len2) {
                printInfo(handle1);
                printf("Different size for \"%s\"  [%zu]  [%zu]\n", name, len1, len2);
                save_error(c, name);
            }
            if (err1 == GRIB_SUCCESS && err2 == GRIB_SUCCESS && len1 == len2) {
                int imaxdiff = 0;
                double diff;
                double *pv1, *pv2;
                maxdiff   = 0;
                countdiff = 0;
                pv1       = dval1;
                pv2       = dval2;
                value_tolerance *= tolerance_factor;
                if (verbose)
                    printf("  (%d values) tolerance=%g\n", (int)len1, value_tolerance);
                for (size_t i = 0; i < len1; i++) {
                    if ((diff = compare_double(pv1++, pv2++, &value_tolerance)) != 0) {
                        countdiff++;
                        if (maxdiff < diff) {
                            maxdiff  = diff;
                            imaxdiff = i;
                        }
                        err1 = GRIB_VALUE_MISMATCH;
                    }
                }

                if (countdiff) {
                    printInfo(handle1);
                    save_error(c, name);
                    if (len1 > 1) {
                        printf("double [%s]: %d out of %zu different\n", name, countdiff, len1);
                        if (dval1[imaxdiff] != GRIB_MISSING_DOUBLE && dval2[imaxdiff] != GRIB_MISSING_DOUBLE) {
                            if (compareAbsolute)
                                printf(" max");
                            printf(" absolute diff. = %.16e,", fabs(dval1[imaxdiff] - dval2[imaxdiff]));
                            if (!compareAbsolute)
                                printf(" max");
                            printf(" relative diff. = %g", relative_error(dval1[imaxdiff], dval2[imaxdiff], value_tolerance));
                            printf("\n\tmax diff. element %d: %.20e %.20e",
                                   imaxdiff, dval1[imaxdiff], dval2[imaxdiff]);
                            printf("\n\ttolerance=%.16e", value_tolerance);
                        }
                        else {
                            /* One or both values are missing */
                            char* svalA = double_as_string(c, dval1[imaxdiff]);
                            char* svalB = double_as_string(c, dval2[imaxdiff]);
                            printf("\tdiff. element %d: %s %s", imaxdiff, svalA, svalB);
                            grib_context_free(c, svalA);
                            grib_context_free(c, svalB);
                        }

                        printf("\n");
                    }
                    else {
                        if (dval1[0] != GRIB_MISSING_DOUBLE && dval2[0] != GRIB_MISSING_DOUBLE) {
                            printf("double [%s]: [%.20e] != [%.20e]\n", name, dval1[0], dval2[0]);
                            printf("\tabsolute diff. = %g,", fabs(dval1[0] - dval2[0]));
                            printf(" relative diff. = %g\n", relative_error(dval1[0], dval2[0], value_tolerance));
                            printf("\ttolerance=%g\n", value_tolerance);
                        }
                        else {
                            /* One or both values are missing */
                            char* svalA = double_as_string(c, dval1[0]);
                            char* svalB = double_as_string(c, dval2[0]);
                            printf("double [%s]: [%s] != [%s]\n", name, svalA, svalB);
                            grib_context_free(c, svalA);
                            grib_context_free(c, svalB);
                        }
                    }
                }
            }

            grib_context_free(handle1->context, dval1);
            grib_context_free(handle2->context, dval2);

            if (err1)
                return err1;
            if (err2)
                return err2;
            break;

        case GRIB_TYPE_BYTES:
            return 0; // Not in BUFR

        case GRIB_TYPE_LABEL:
            break;

        default:
            if (verbose) printf("\n");
            printInfo(handle1);
            save_error(c, name);
            printf("Cannot compare [%s], unsupported type %d\n", name, type1);
            return GRIB_UNABLE_TO_COMPARE_ACCESSORS;
    }

    return GRIB_SUCCESS;
}

static int compare_attributes(grib_handle* handle1, grib_handle* handle2, grib_runtime_options* options,
                              grib_accessor* a, const char* prefix, int* err)
{
    int i = 0, ret = 0;
    while (i < MAX_ACCESSOR_ATTRIBUTES && a->attributes_[i]) {
        /*long native_type = 0;*/
        grib_accessor* aa = NULL;
        if ((a->attributes_[i]->flags_ & GRIB_ACCESSOR_FLAG_DUMP) == 0) {
            ++i; /* next attribute if accessor is not for dumping */
            continue;
        }
        if ((a->attributes_[i]->flags_ & GRIB_ACCESSOR_FLAG_READ_ONLY) != 0) {
            ++i; /* next attribute if accessor is read-only */
            continue;
        }

        aa = a->attributes_[i];
        /*native_type = grib_accessor_get_native_type(aa);   TODO: read only check? */

        isLeafKey = aa->attributes_[0] == NULL ? 1 : 0; /* update global variable */

        if (compare_attribute(handle1, handle2, options, aa, prefix, err)) {
            (*err)++;
            ret = 1;
        }

        ++i; /* next attribute */
    }

    return ret;
}

static int compare_attribute(grib_handle* handle1, grib_handle* handle2, grib_runtime_options* options,
                             grib_accessor* a, const char* prefix, int* err)
{
    int ret         = 0;
    grib_context* c = handle1->context;
    const size_t fullnameMaxLen = strlen(a->name_) + strlen(prefix) + 5;
    char* fullname  = (char*)grib_context_malloc_clear(c, sizeof(char) * fullnameMaxLen);
    snprintf(fullname, fullnameMaxLen, "%s->%s", prefix, a->name_);
    if (compare_values(options, handle1, handle2, fullname, GRIB_TYPE_UNDEFINED)) {
        (*err)++;
        ret = 1;
    }
    /* Recurse if this key has children */
    if (!isLeafKey) {
        if (compare_attributes(handle1, handle2, options, a, fullname, err)) {
            ret = 1;
        }
    }
    grib_context_free(c, fullname);
    return ret;
}

static int compare_all_dump_keys(grib_handle* handle1, grib_handle* handle2, grib_runtime_options* options, int* pErr)
{
    int ret                  = 0;
    const char* name         = NULL;
    grib_keys_iterator* iter = NULL;
    grib_context* context    = handle1->context;

    if (!headerMode) {
        /* See ECC-333: By setting unpack we get ALL the bufr keys. */
        /*              In headerMode we want just the header ones */
        grib_set_long(handle1, "skipExtraKeyAttributes", 1); /* See ECC-745 */
        ret = grib_set_long(handle1, "unpack", 1);
        if (ret != GRIB_SUCCESS) {
            grib_context_log(context, GRIB_LOG_ERROR, "Failed to unpack 1st message: %s", grib_get_error_message(ret));
            exit(1);
        }
        grib_set_long(handle2, "skipExtraKeyAttributes", 1); /* See ECC-745 */
        ret = grib_set_long(handle2, "unpack", 1);
        if (ret != GRIB_SUCCESS) {
            grib_context_log(context, GRIB_LOG_ERROR, "Failed to unpack 2nd message: %s", grib_get_error_message(ret));
            exit(1);
        }
    }
    iter = grib_keys_iterator_new(handle1, 0, NULL);
    if (!iter) {
        grib_context_log(context, GRIB_LOG_ERROR, "unable to create the BUFR keys iterator");
        exit(1);
    }

    release_keys_list(); /* The keys list is used to determine the rank */
    new_keys_list();

    while (grib_keys_iterator_next(iter)) {
        int rank          = 0;
        int dofree        = 0;
        char* prefix      = NULL;
        grib_accessor* xa = grib_keys_iterator_get_accessor(iter);

        isLeafKey = 0; /* clear global variable for each key */
        name      = grib_keys_iterator_get_name(iter);
        if (blocklisted(name))
            continue;
        if (xa == NULL || (xa->flags_ & GRIB_ACCESSOR_FLAG_DUMP) == 0)
            continue;

        /* Get full name of key, e.g. '#2#windSpeed' or 'blockNumber' */
        rank = compute_bufr_key_rank(handle1, keys_list, xa->name_);
        if (rank != 0) {
            const size_t prefixMaxLen = strlen(xa->name_) + 10;
            prefix = (char*)grib_context_malloc_clear(context, sizeof(char) * prefixMaxLen);
            dofree = 1;
            snprintf(prefix, prefixMaxLen, "#%d#%s", rank, xa->name_);
        }
        else {
            prefix = (char*)xa->name_;
        }

        if (blocklisted(prefix)) {
            if (dofree) grib_context_free(context, prefix);
            continue;
        }

        /* Compare the key itself */
        if (compare_values(options, handle1, handle2, prefix, GRIB_TYPE_UNDEFINED)) {
            (*pErr)++;
            ret = 1;
        }
        /* Now compare the key attributes (if any) */
        if (compare_attributes(handle1, handle2, options, xa, prefix, pErr)) {
            (*pErr)++;
            ret = 1;
        }
        if (dofree)
            grib_context_free(context, prefix);
    }

    grib_keys_iterator_delete(iter);

    return ret;
}

static int compare_handles(grib_handle* handle1, grib_handle* handle2, grib_runtime_options* options)
{
    int err                  = 0;
    int i                    = 0;
    grib_keys_iterator* iter = NULL;
    const char* name         = NULL;

    if (listFromCommandLine && onlyListed) {
        for (i = 0; i < options->compare_count; i++) {
            if (blocklisted(options->compare[i].name))
                continue;
            if (options->compare[i].type == CODES_NAMESPACE) {
                iter = grib_keys_iterator_new(handle1, 0, options->compare[i].name);
                if (!iter) {
                    grib_context_log(handle1->context, GRIB_LOG_ERROR, "unable to create the BUFR keys iterator");
                    exit(1);
                }
                while (grib_keys_iterator_next(iter)) {
                    name = grib_keys_iterator_get_name(iter);

                    if (blocklisted(name))
                        continue;
                    if (compare_values(options, handle1, handle2, name, GRIB_TYPE_UNDEFINED)) {
                        err++;
                    }
                }
                grib_keys_iterator_delete(iter);
            }
            else {
                if (compare_values(options, handle1, handle2, options->compare[i].name, options->compare[i].type))
                    err++;
            }
        }
    }
    else {
        const void *msg1 = NULL, *msg2 = NULL;
        size_t size1 = 0, size2 = 0;
        GRIB_CHECK_NOLINE(grib_get_message(handle1, &msg1, &size1), 0);
        GRIB_CHECK_NOLINE(grib_get_message(handle2, &msg2, &size2), 0);
        if (size1 == size2 && 0 == memcmp(msg1, msg2, size1)) {
            return 0;
        }
#if defined(BUFR_COMPARE_BYTES)
        else {
            int lcount=count,ii;
            if (options->current_infile) lcount=options->current_infile->filter_handle_count;
            if (size1 != size2) {
                printf("#%d different size: %d!=%d\n",lcount,(int)size1,(int)size2);
            }
            if (memcmp_ret) {
                unsigned char *m1=(unsigned char*)msg1;
                unsigned char *m2=(unsigned char*)msg2;
                printf("=== list of different bytes for message %d\n",lcount);
                for (ii=0;ii<size1;ii++) {
                    if (memcmp(m1,m2,1)) {
                        printf("  %d 0x%.2X != 0x%.2X\n",ii,*m1,*m2);
                    }
                    m1++; m2++;
                }
            }
            return err;
        }
#endif

        if (listFromCommandLine) {
            for (i = 0; i < options->compare_count; i++) {
                if (blocklisted(name))
                    continue;
                if (options->compare[i].type == CODES_NAMESPACE) {
                    iter = grib_keys_iterator_new(handle1, 0, options->compare[i].name);
                    if (!iter) {
                        grib_context_log(handle1->context, GRIB_LOG_ERROR,
                                         "unable to create the BUFR keys iterator for %s", options->compare[i].name);
                        exit(1);
                    }
                    while (grib_keys_iterator_next(iter)) {
                        name = grib_keys_iterator_get_name(iter);

                        if (blocklisted(name))
                            continue;
                        if (compare_values(options, handle1, handle2, name, GRIB_TYPE_UNDEFINED)) {
                            err++;
                            if (compare_all_dump_keys(handle1, handle2, options, &err)) {
                                err++;
                            }
                        }
                    }
                    grib_keys_iterator_delete(iter);
                }
                else {
                    if (compare_values(options, handle1, handle2, options->compare[i].name, options->compare[i].type)) {
                        err++;
                        if (compare_all_dump_keys(handle1, handle2, options, &err)) {
                            err++;
                        }
                    }
                }
            }
        }
        else {
            if (compare_all_dump_keys(handle1, handle2, options, &err)) {
                err++;
            }
        }
    }
    return err;
}

int grib_no_handle_action(grib_runtime_options* options, int err)
{
    fprintf(dump_file, "\t\t\"ERROR: unreadable message\"\n");
    return 0;
}