/*
 * (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_long
   IMPLEMENTS = unpack_long;pack_long
   IMPLEMENTS = init;dump
   IMPLEMENTS = next_offset
   IMPLEMENTS = byte_count
   IMPLEMENTS = value_count
   IMPLEMENTS = byte_offset
   IMPLEMENTS = update_size; is_missing
   MEMBERS    = grib_arguments* arg
   MEMBERS    = int nbytes;
   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 is_missing(grib_accessor*);
static int pack_long(grib_accessor*, const long* val, size_t* len);
static int unpack_long(grib_accessor*, long* val, size_t* len);
static long byte_count(grib_accessor*);
static long byte_offset(grib_accessor*);
static long next_offset(grib_accessor*);
static int value_count(grib_accessor*, long*);
static void dump(grib_accessor*, grib_dumper*);
static void init(grib_accessor*, const long, grib_arguments*);
static void init_class(grib_accessor_class*);
static void update_size(grib_accessor*, size_t);

typedef struct grib_accessor_signed
{
    grib_accessor att;
    /* Members defined in gen */
    /* Members defined in long */
    /* Members defined in signed */
    grib_arguments* arg;
    int nbytes;
} grib_accessor_signed;

extern grib_accessor_class* grib_accessor_class_long;

static grib_accessor_class _grib_accessor_class_signed = {
    &grib_accessor_class_long,    /* super                     */
    "signed",                     /* name                      */
    sizeof(grib_accessor_signed), /* size                      */
    0,                            /* inited */
    &init_class,                  /* init_class */
    &init,                        /* init                      */
    0,                            /* post_init                      */
    0,                            /* free mem                       */
    &dump,                        /* describes himself         */
    &next_offset,                 /* get length of section     */
    0,                            /* get length of string      */
    &value_count,                 /* get number of values      */
    &byte_count,                  /* get number of bytes      */
    &byte_offset,                 /* get offset to bytes           */
    0,                            /* get native type               */
    0,                            /* get sub_section                */
    0,                            /* grib_pack procedures long      */
    &is_missing,                  /* grib_pack procedures long      */
    &pack_long,                   /* grib_pack procedures long      */
    &unpack_long,                 /* grib_unpack procedures long    */
    0,                            /* grib_pack procedures double    */
    0,                            /* grib_unpack procedures double  */
    0,                            /* grib_pack procedures string    */
    0,                            /* grib_unpack procedures string  */
    0,                            /* grib_pack array procedures string    */
    0,                            /* grib_unpack array procedures string  */
    0,                            /* grib_pack procedures bytes     */
    0,                            /* grib_unpack procedures bytes   */
    0,                            /* pack_expression */
    0,                            /* notify_change   */
    &update_size,                 /* update_size   */
    0,                            /* preferred_size   */
    0,                            /* resize   */
    0,                            /* nearest_smaller_value */
    0,                            /* next accessor    */
    0,                            /* compare vs. another accessor   */
    0,                            /* unpack only ith value          */
    0,                            /* unpack a subarray         */
    0,                            /* clear          */
    0,                            /* clone accessor          */
};


grib_accessor_class* grib_accessor_class_signed = &_grib_accessor_class_signed;


static void init_class(grib_accessor_class* c)
{
    c->string_length          = (*(c->super))->string_length;
    c->get_native_type        = (*(c->super))->get_native_type;
    c->sub_section            = (*(c->super))->sub_section;
    c->pack_missing           = (*(c->super))->pack_missing;
    c->pack_double            = (*(c->super))->pack_double;
    c->unpack_double          = (*(c->super))->unpack_double;
    c->pack_string            = (*(c->super))->pack_string;
    c->unpack_string          = (*(c->super))->unpack_string;
    c->pack_string_array      = (*(c->super))->pack_string_array;
    c->unpack_string_array    = (*(c->super))->unpack_string_array;
    c->pack_bytes             = (*(c->super))->pack_bytes;
    c->unpack_bytes           = (*(c->super))->unpack_bytes;
    c->pack_expression        = (*(c->super))->pack_expression;
    c->notify_change          = (*(c->super))->notify_change;
    c->preferred_size         = (*(c->super))->preferred_size;
    c->resize                 = (*(c->super))->resize;
    c->nearest_smaller_value  = (*(c->super))->nearest_smaller_value;
    c->next                   = (*(c->super))->next;
    c->compare                = (*(c->super))->compare;
    c->unpack_double_element  = (*(c->super))->unpack_double_element;
    c->unpack_double_subarray = (*(c->super))->unpack_double_subarray;
    c->clear                  = (*(c->super))->clear;
    c->make_clone             = (*(c->super))->make_clone;
}

/* END_CLASS_IMP */

static void init(grib_accessor* a, const long len, grib_arguments* arg)
{
    grib_accessor_signed* self = (grib_accessor_signed*)a;
    long count                 = 0;

    self->arg = arg;
    grib_value_count(a, &count);
    a->length    = len * count;
    self->nbytes = len;
    Assert(a->length >= 0);
}

static void dump(grib_accessor* a, grib_dumper* dumper)
{
    long rlen = 0;
    grib_value_count(a, &rlen);
    if (rlen == 1)
        grib_dump_long(dumper, a, NULL);
    else
        grib_dump_values(dumper, a);
}

static const long ones[] = {
    0,
    -0x7f,
    -0x7fff,
    -0x7fffff,
    -0x7fffffff,
};

static int unpack_long(grib_accessor* a, long* val, size_t* len)
{
    grib_accessor_signed* self = (grib_accessor_signed*)a;
    unsigned long rlen         = 0;
    int err                    = 0;
    long count                 = 0;
    unsigned long i            = 0;
    grib_handle* hand          = grib_handle_of_accessor(a);
    long pos                   = a->offset;
    long missing               = 0;

    err = grib_value_count(a, &count);
    if (err)
        return err;
    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 (a->flags & GRIB_ACCESSOR_FLAG_CAN_BE_MISSING) {
        Assert(self->nbytes <= 4);
        missing = ones[self->nbytes];
    }

    for (i = 0; i < rlen; i++) {
        val[i] = (long)grib_decode_signed_long(hand->buffer->data, pos, self->nbytes);
        if (missing)
            if (val[i] == missing)
                val[i] = GRIB_MISSING_LONG;
        pos += self->nbytes;
    }

    *len = rlen;
    return GRIB_SUCCESS;
}

static int pack_long(grib_accessor* a, const long* val, size_t* len)
{
    grib_accessor_signed* self = (grib_accessor_signed*)a;
    int ret                    = 0;
    long off                   = 0;
    unsigned long rlen         = 0;
    int err                    = 0;
    long count                 = 0;
    size_t buflen              = 0;
    unsigned char* buf         = NULL;
    unsigned long i            = 0;
    long missing               = 0;

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

    if (*len < 1) {
        grib_context_log(a->context, GRIB_LOG_ERROR, "Wrong size for %s it contains %d values ", a->name, 1);
        len[0] = 0;
        return GRIB_ARRAY_TOO_SMALL;
    }

    if (a->flags & GRIB_ACCESSOR_FLAG_CAN_BE_MISSING) {
        Assert(self->nbytes <= 4);
        missing = ones[self->nbytes];
    }

    if (rlen == 1) {
        long v = val[0];
        if (missing)
            if (v == GRIB_MISSING_LONG)
                v = missing;

        off = a->offset;
        ret = grib_encode_signed_long(grib_handle_of_accessor(a)->buffer->data, v, off, a->length);
        if (ret == GRIB_SUCCESS)
            len[0] = 1;
        if (*len > 1)
            grib_context_log(a->context, GRIB_LOG_WARNING, "grib_accessor_signed : Trying to pack %d values in a scalar %s, packing first value", *len, a->name);
        len[0] = 1;
        return ret;
    }

    /* TODO: We assume that there are no missing values if there are more that 1 value */

    buflen = *len * a->length;

    buf = (unsigned char*)grib_context_malloc(a->context, buflen);

    for (i = 0; i < *len; i++) {
        grib_encode_signed_long(buf, val[i], off, a->length);
        off += a->length;
    }
    ret = grib_set_long_internal(grib_handle_of_accessor(a), grib_arguments_get_name(a->parent->h, self->arg, 0), *len);

    if (ret == GRIB_SUCCESS)
        grib_buffer_replace(a, buf, buflen, 1, 1);
    else
        *len = 0;

    grib_context_free(a->context, buf);
    return ret;
}

static long byte_count(grib_accessor* a)
{
    return a->length;
}

static int value_count(grib_accessor* a, long* len)
{
    grib_accessor_signed* self = (grib_accessor_signed*)a;
    *len                       = 0;
    if (!self->arg) {
        *len = 1;
        return 0;
    }
    return grib_get_long_internal(grib_handle_of_accessor(a), grib_arguments_get_name(a->parent->h, self->arg, 0), len);
}

static long byte_offset(grib_accessor* a)
{
    return a->offset;
}

static void update_size(grib_accessor* a, size_t s)
{
    a->length = s;
    Assert(a->length >= 0);
}

static long next_offset(grib_accessor* a)
{
    return grib_byte_offset(a) + grib_byte_count(a);
}

static int is_missing(grib_accessor* a)
{
    int i                = 0;
    unsigned char ff     = 0xff;
    unsigned long offset = a->offset;
    grib_handle* hand    = grib_handle_of_accessor(a);

    if (a->length == 0) {
        Assert(a->vvalue != NULL);
        return a->vvalue->missing;
    }

    for (i = 0; i < a->length; i++) {
        if (hand->buffer->data[offset] != ff)
            return 0;
        offset++;
    }

    return 1;
}
