/*
 * (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_api_internal.h"
/*
   This is used by make_class.pl

   START_CLASS_DEF
   CLASS      = accessor
   SUPER      = grib_accessor_class_gen
   IMPLEMENTS = get_native_type;pack_missing;
   IMPLEMENTS = unpack_string; pack_string
   IMPLEMENTS = unpack_double
   IMPLEMENTS = dump
   IMPLEMENTS = compare
   END_CLASS_DEF

 */

/* START_CLASS_IMP */

/*

Don't edit anything between START_CLASS_IMP and END_CLASS_IMP
Instead edit values between START_CLASS_DEF and END_CLASS_DEF
or edit "accessor.class" and rerun ./make_class.pl

*/

static int get_native_type(grib_accessor*);
static int pack_missing(grib_accessor*);
static int pack_string(grib_accessor*, const char*, size_t* len);
static int unpack_double(grib_accessor*, double* val, size_t* len);
static int unpack_string(grib_accessor*, char*, size_t* len);
static void dump(grib_accessor*, grib_dumper*);
static int compare(grib_accessor*, grib_accessor*);

typedef struct grib_accessor_long
{
    grib_accessor att;
    /* Members defined in gen */
    /* Members defined in long */
} grib_accessor_long;

extern grib_accessor_class* grib_accessor_class_gen;

static grib_accessor_class _grib_accessor_class_long = {
    &grib_accessor_class_gen,                      /* super */
    "long",                      /* name */
    sizeof(grib_accessor_long),  /* size */
    0,                           /* inited */
    0,                           /* init_class */
    0,                       /* init */
    0,                  /* post_init */
    0,                    /* destroy */
    &dump,                       /* dump */
    0,                /* next_offset */
    0,              /* get length of string */
    0,                /* get number of values */
    0,                 /* get number of bytes */
    0,                /* get offset to bytes */
    &get_native_type,            /* get native type */
    0,                /* get sub_section */
    &pack_missing,               /* pack_missing */
    0,                 /* is_missing */
    0,                  /* pack_long */
    0,                /* unpack_long */
    0,                /* pack_double */
    0,                 /* pack_float */
    &unpack_double,              /* unpack_double */
    0,               /* unpack_float */
    &pack_string,                /* pack_string */
    &unpack_string,              /* unpack_string */
    0,          /* pack_string_array */
    0,        /* unpack_string_array */
    0,                 /* pack_bytes */
    0,               /* unpack_bytes */
    0,            /* pack_expression */
    0,              /* notify_change */
    0,                /* update_size */
    0,             /* preferred_size */
    0,                     /* resize */
    0,      /* nearest_smaller_value */
    0,                       /* next accessor */
    &compare,                    /* compare vs. another accessor */
    0,      /* unpack only ith value (double) */
    0,       /* unpack only ith value (float) */
    0,  /* unpack a given set of elements (double) */
    0,   /* unpack a given set of elements (float) */
    0,     /* unpack a subarray */
    0,                      /* clear */
    0,                 /* clone accessor */
};


grib_accessor_class* grib_accessor_class_long = &_grib_accessor_class_long;

/* END_CLASS_IMP */

static int get_native_type(grib_accessor* a)
{
    return GRIB_TYPE_LONG;
}

static void dump(grib_accessor* a, grib_dumper* dumper)
{
    grib_dump_long(dumper, a, NULL);
}

static int unpack_string(grib_accessor* a, char* v, size_t* len)
{
    int err  = 0;
    long val = 0;
    size_t l = 1;
    char repres[1024];
    char format[32] = "%ld";
    grib_handle* h = grib_handle_of_accessor(a);

    err = grib_unpack_long(a, &val, &l);
    /* TODO: We should catch all errors but in this case the test ERA_Gen.sh will fail
     * as the output from grib_ls will be different */
    /* if (err) return err; */
    (void)err;

    if ((val == GRIB_MISSING_LONG) && ((a->flags & GRIB_ACCESSOR_FLAG_CAN_BE_MISSING) != 0)) {
        snprintf(repres, sizeof(repres), "MISSING");
    } else {
        size_t size = sizeof(format);
        grib_get_string(h, "formatForLongs", format, &size);
        snprintf(repres, sizeof(repres), format, val);
    }

    l = strlen(repres) + 1;

    if (l > *len) {
        grib_context_log(a->context, GRIB_LOG_ERROR, "grib_accessor_long : unpack_string : Buffer too small for %s ", a->name);
        *len = l;
        return GRIB_BUFFER_TOO_SMALL;
    }
    /*grib_context_log(a->context,GRIB_LOG_DEBUG, "grib_accessor_long: Casting long %s to string ", a->name);*/

    *len = l;

    strcpy(v, repres);
    return GRIB_SUCCESS;
}

static int pack_missing(grib_accessor* a)
{
    size_t len = 1;
    long value = GRIB_MISSING_LONG;

    if (a->flags & GRIB_ACCESSOR_FLAG_CAN_BE_MISSING)
        return grib_pack_long(a, &value, &len);

    return GRIB_VALUE_CANNOT_BE_MISSING;
}

static int unpack_double(grib_accessor* a, double* val, size_t* len)
{
    size_t rlen     = 0;
    long count      = 0;
    unsigned long i = 0;
    long* values    = NULL;
    long oneval     = 0;
    int ret         = GRIB_SUCCESS;

    ret = grib_value_count(a, &count);
    if (ret)
        return ret;
    rlen = count;

    if (*len < rlen) {
        grib_context_log(a->context, GRIB_LOG_ERROR, "Wrong size for %s, it contains %lu values", a->name, rlen);
        *len = 0;
        return GRIB_ARRAY_TOO_SMALL;
    }

    if (rlen == 1) {
        ret = grib_unpack_long(a, &oneval, &rlen);
        if (ret != GRIB_SUCCESS)
            return ret;
        *val = oneval;
        *len = 1;
        return GRIB_SUCCESS;
    }

    values = (long*)grib_context_malloc(a->context, rlen * sizeof(long));
    if (!values)
        return GRIB_OUT_OF_MEMORY;

    ret = grib_unpack_long(a, values, &rlen);
    if (ret != GRIB_SUCCESS) {
        grib_context_free(a->context, values);
        return ret;
    }
    for (i = 0; i < rlen; i++)
        val[i] = values[i];

    grib_context_free(a->context, values);

    *len = rlen;
    return GRIB_SUCCESS;
}

static int compare(grib_accessor* a, grib_accessor* b)
{
    int retval = 0;
    long* aval = 0;
    long* bval = 0;
    long count = 0;

    size_t alen = 0;
    size_t blen = 0;
    int err     = 0;

    err = grib_value_count(a, &count);
    if (err)
        return err;
    alen = count;

    err = grib_value_count(b, &count);
    if (err)
        return err;
    blen = count;

    if (alen != blen)
        return GRIB_COUNT_MISMATCH;

    aval = (long*)grib_context_malloc(a->context, alen * sizeof(long));
    bval = (long*)grib_context_malloc(b->context, blen * sizeof(long));

    grib_unpack_long(a, aval, &alen);
    grib_unpack_long(b, bval, &blen);

    retval = GRIB_SUCCESS;
    for (size_t i=0; i<alen && retval == GRIB_SUCCESS; ++i) {
        if (aval[i] != bval[i]) retval = GRIB_LONG_VALUE_MISMATCH;
    }

    grib_context_free(a->context, aval);
    grib_context_free(b->context, bval);

    return retval;
}

static int pack_string(grib_accessor* a, const char* val, size_t* len)
{
    long v = 0; /* The converted value */

    // ECC-1722
    if (STR_EQUAL_NOCASE(val, "missing")) {
        return pack_missing(a);
    }

    if (string_to_long(val, &v, 1) != GRIB_SUCCESS) {
        grib_context_log(a->context, GRIB_LOG_ERROR,
                "Trying to pack \"%s\" as long. String cannot be converted to an integer", val);
        return GRIB_WRONG_TYPE;
    }
    return grib_pack_long(a, &v, len);
}