/*
 * (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.
 */
/*****************************
 *  Enrico Fucile
 ****************************/

#include "grib_api_internal.h"

#define PRE_PROCESSING_NONE 0
#define PRE_PROCESSING_DIFFERENCE 1
/*
   This is used by make_class.pl

   START_CLASS_DEF
   CLASS      = accessor
   SUPER      = grib_accessor_class_values
   IMPLEMENTS = init
   IMPLEMENTS = unpack_double
   IMPLEMENTS = unpack_double_element
   IMPLEMENTS = pack_double
   IMPLEMENTS = value_count
   MEMBERS=const char*   number_of_values
   MEMBERS=const char*   precision
   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 pack_double(grib_accessor*, const double* val, size_t* len);
static int unpack_double(grib_accessor*, double* val, size_t* len);
static int value_count(grib_accessor*, long*);
static void init(grib_accessor*, const long, grib_arguments*);
static void init_class(grib_accessor_class*);
static int unpack_double_element(grib_accessor*, size_t i, double* val);

typedef struct grib_accessor_data_raw_packing
{
    grib_accessor att;
    /* Members defined in gen */
    /* Members defined in values */
    int carg;
    const char* seclen;
    const char* offsetdata;
    const char* offsetsection;
    int dirty;
    /* Members defined in data_raw_packing */
    const char* number_of_values;
    const char* precision;
} grib_accessor_data_raw_packing;

extern grib_accessor_class* grib_accessor_class_values;

static grib_accessor_class _grib_accessor_class_data_raw_packing = {
    &grib_accessor_class_values,            /* super                     */
    "data_raw_packing",                     /* name                      */
    sizeof(grib_accessor_data_raw_packing), /* size                      */
    0,                                      /* inited */
    &init_class,                            /* init_class */
    &init,                                  /* init                      */
    0,                                      /* post_init                      */
    0,                                      /* free mem                       */
    0,                                      /* describes himself         */
    0,                                      /* get length of section     */
    0,                                      /* get length of string      */
    &value_count,                           /* get number of values      */
    0,                                      /* get number of bytes      */
    0,                                      /* get offset to bytes           */
    0,                                      /* get native type               */
    0,                                      /* get sub_section                */
    0,                                      /* grib_pack procedures long      */
    0,                                      /* grib_pack procedures long      */
    0,                                      /* grib_pack procedures long      */
    0,                                      /* grib_unpack procedures long    */
    &pack_double,                           /* grib_pack procedures double    */
    &unpack_double,                         /* 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   */
    0,                                      /* update_size   */
    0,                                      /* preferred_size   */
    0,                                      /* resize   */
    0,                                      /* nearest_smaller_value */
    0,                                      /* next accessor    */
    0,                                      /* compare vs. another accessor   */
    &unpack_double_element,                 /* unpack only ith value          */
    0,                                      /* unpack a subarray         */
    0,                                      /* clear          */
    0,                                      /* clone accessor          */
};


grib_accessor_class* grib_accessor_class_data_raw_packing = &_grib_accessor_class_data_raw_packing;


static void init_class(grib_accessor_class* c)
{
    c->dump                   = (*(c->super))->dump;
    c->next_offset            = (*(c->super))->next_offset;
    c->string_length          = (*(c->super))->string_length;
    c->byte_count             = (*(c->super))->byte_count;
    c->byte_offset            = (*(c->super))->byte_offset;
    c->get_native_type        = (*(c->super))->get_native_type;
    c->sub_section            = (*(c->super))->sub_section;
    c->pack_missing           = (*(c->super))->pack_missing;
    c->is_missing             = (*(c->super))->is_missing;
    c->pack_long              = (*(c->super))->pack_long;
    c->unpack_long            = (*(c->super))->unpack_long;
    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->update_size            = (*(c->super))->update_size;
    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_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 v, grib_arguments* args)
{
    grib_accessor_data_raw_packing* self = (grib_accessor_data_raw_packing*)a;

    self->number_of_values = grib_arguments_get_name(grib_handle_of_accessor(a), args, self->carg++);
    self->precision        = grib_arguments_get_name(grib_handle_of_accessor(a), args, self->carg++);
    a->flags |= GRIB_ACCESSOR_FLAG_DATA;
}

static int value_count(grib_accessor* a, long* n_vals)
{
    grib_accessor_data_raw_packing* self = (grib_accessor_data_raw_packing*)a;
    *n_vals                              = 0;
    return grib_get_long_internal(grib_handle_of_accessor(a), self->number_of_values, n_vals);
}

static int unpack_double(grib_accessor* a, double* val, size_t* len)
{
    grib_accessor_data_raw_packing* self = (grib_accessor_data_raw_packing*)a;
    unsigned char* buf                   = NULL;
    int bytes                            = 0;
    size_t nvals                         = 0;
    long inlen                           = grib_byte_count(a);

    long precision = 0;

    int code = GRIB_SUCCESS;

    if ((code = grib_get_long(grib_handle_of_accessor(a), self->precision, &precision)) != GRIB_SUCCESS)
        return code;

    self->dirty = 0;

    buf = (unsigned char*)grib_handle_of_accessor(a)->buffer->data;
    buf += grib_byte_offset(a);

    switch (precision) {
        case 1:
            bytes = 4;
            break;
        case 2:
            bytes = 8;
            break;
        default:
            return GRIB_NOT_IMPLEMENTED;
            break;
    }

    nvals = inlen / bytes;

    if (*len < nvals)
        return GRIB_ARRAY_TOO_SMALL;

    code = grib_ieee_decode_array(a->context, buf, nvals, bytes, val);

    *len = nvals;

    return code;
}

static int pack_double(grib_accessor* a, const double* val, size_t* len)
{
    grib_accessor_data_raw_packing* self = (grib_accessor_data_raw_packing*)a;

    int bytes             = 0;
    unsigned char* buffer = NULL;

    long precision = 0;

    double* values = (double*)val;
    size_t inlen   = *len;

    /*int free_buffer = 0;
     *int free_values = 0;*/

    int code = GRIB_SUCCESS;

    size_t bufsize = 0;

    if (*len == 0)
        return GRIB_NO_VALUES;

    if ((code = grib_get_long_internal(grib_handle_of_accessor(a), self->precision, &precision)) != GRIB_SUCCESS)
        return code;

    self->dirty = 1;

    switch (precision) {
        case 1:
            bytes = 4;
            break;

        case 2:
            bytes = 8;
            break;

        default:
            code = GRIB_NOT_IMPLEMENTED;
            goto clean_up;
            break;
    }

    bufsize = bytes * inlen;

    buffer = (unsigned char*)grib_context_malloc(a->context, bufsize);

    if (!buffer) {
        code = GRIB_OUT_OF_MEMORY;
        goto clean_up;
    }

    code = grib_ieee_encode_array(a->context, values, inlen, bytes, buffer);

clean_up:
    /*if (free_buffer)
     *  free(buffer);
     * if (free_values)
     *  free(values);
    */

    grib_buffer_replace(a, buffer, bufsize, 1, 1);

    grib_context_buffer_free(a->context, buffer);

    if (code == GRIB_SUCCESS) {
        code = grib_set_long(grib_handle_of_accessor(a), self->number_of_values, inlen);
        if (code == GRIB_READ_ONLY)
            code = 0;
    }

    return code;
}

static int unpack_double_element(grib_accessor* a, size_t idx, double* val)
{
    int ret                              = 0;
    grib_accessor_data_raw_packing* self = (grib_accessor_data_raw_packing*)a;
    unsigned char* buf                   = NULL;
    int bytes                            = 0;
    size_t nvals                         = 0;
    long inlen                           = grib_byte_count(a);
    long pos;

    long precision = 0;

    if ((ret = grib_get_long_internal(grib_handle_of_accessor(a), self->precision, &precision)) != GRIB_SUCCESS)
        return ret;

    self->dirty = 0;

    buf = (unsigned char*)grib_handle_of_accessor(a)->buffer->data;
    buf += grib_byte_offset(a);

    switch (precision) {
        case 1:
            bytes = 4;
            break;

        case 2:
            bytes = 8;
            break;

        default:
            return GRIB_NOT_IMPLEMENTED;
            break;
    }

    pos = bytes * idx;

    Assert(pos <= inlen);

    nvals = 1;
    buf += pos;

    ret = grib_ieee_decode_array(a->context, buf, nvals, bytes, val);

    return ret;
}
