/*
 * (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 = init; get_native_type
   IMPLEMENTS = pack_long;
   MEMBERS    = const char* doExtractSubsets
   MEMBERS    = const char* numberOfSubsets
   MEMBERS    = const char* extractSubsetList
   MEMBERS    = const char* extractAreaWestLongitude
   MEMBERS    = const char* extractAreaEastLongitude
   MEMBERS    = const char* extractAreaNorthLatitude
   MEMBERS    = const char* extractAreaSouthLatitude
   MEMBERS    = const char* extractAreaLongitudeRank
   MEMBERS    = const char* extractAreaLatitudeRank
   MEMBERS    = const char* extractedAreaNumberOfSubsets
   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_long(grib_accessor*, const long* val, size_t* len);
static void init(grib_accessor*, const long, grib_arguments*);
static void init_class(grib_accessor_class*);

typedef struct grib_accessor_bufr_extract_area_subsets
{
    grib_accessor att;
    /* Members defined in gen */
    /* Members defined in bufr_extract_area_subsets */
    const char* doExtractSubsets;
    const char* numberOfSubsets;
    const char* extractSubsetList;
    const char* extractAreaWestLongitude;
    const char* extractAreaEastLongitude;
    const char* extractAreaNorthLatitude;
    const char* extractAreaSouthLatitude;
    const char* extractAreaLongitudeRank;
    const char* extractAreaLatitudeRank;
    const char* extractedAreaNumberOfSubsets;
} grib_accessor_bufr_extract_area_subsets;

extern grib_accessor_class* grib_accessor_class_gen;

static grib_accessor_class _grib_accessor_class_bufr_extract_area_subsets = {
    &grib_accessor_class_gen,                        /* super                     */
    "bufr_extract_area_subsets",                     /* name                      */
    sizeof(grib_accessor_bufr_extract_area_subsets), /* 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      */
    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                */
    0,                                               /* grib_pack procedures long      */
    0,                                               /* grib_pack procedures long      */
    &pack_long,                                      /* grib_pack procedures long      */
    0,                                               /* 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   */
    0,                                               /* 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_bufr_extract_area_subsets = &_grib_accessor_class_bufr_extract_area_subsets;


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->value_count            = (*(c->super))->value_count;
    c->byte_count             = (*(c->super))->byte_count;
    c->byte_offset            = (*(c->super))->byte_offset;
    c->sub_section            = (*(c->super))->sub_section;
    c->pack_missing           = (*(c->super))->pack_missing;
    c->is_missing             = (*(c->super))->is_missing;
    c->unpack_long            = (*(c->super))->unpack_long;
    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->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_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)
{
    int n                                         = 0;
    grib_accessor_bufr_extract_area_subsets* self = (grib_accessor_bufr_extract_area_subsets*)a;

    a->length                          = 0;
    self->doExtractSubsets             = grib_arguments_get_name(grib_handle_of_accessor(a), arg, n++);
    self->numberOfSubsets              = grib_arguments_get_name(grib_handle_of_accessor(a), arg, n++);
    self->extractSubsetList            = grib_arguments_get_name(grib_handle_of_accessor(a), arg, n++);
    self->extractAreaWestLongitude     = grib_arguments_get_name(grib_handle_of_accessor(a), arg, n++);
    self->extractAreaEastLongitude     = grib_arguments_get_name(grib_handle_of_accessor(a), arg, n++);
    self->extractAreaNorthLatitude     = grib_arguments_get_name(grib_handle_of_accessor(a), arg, n++);
    self->extractAreaSouthLatitude     = grib_arguments_get_name(grib_handle_of_accessor(a), arg, n++);
    self->extractAreaLongitudeRank     = grib_arguments_get_name(grib_handle_of_accessor(a), arg, n++);
    self->extractAreaLatitudeRank      = grib_arguments_get_name(grib_handle_of_accessor(a), arg, n++);
    self->extractedAreaNumberOfSubsets = grib_arguments_get_name(grib_handle_of_accessor(a), arg, n++);

    a->flags |= GRIB_ACCESSOR_FLAG_FUNCTION;
}

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

/* Copy first element of array into all others */
static void fill_in(double a[], long length)
{
    long i;
    for (i = 1; i < length; ++i)
        a[i] = a[0];
}
static int select_area(grib_accessor* a)
{
    int ret                                       = 0;
    long compressed                               = 0;
    grib_accessor_bufr_extract_area_subsets* self = (grib_accessor_bufr_extract_area_subsets*)a;
    grib_handle* h                                = grib_handle_of_accessor(a);
    grib_context* c                               = h->context;

    double* lat = 0;
    double* lon = 0;
    size_t n;
    double lonWest, lonEast, latNorth, latSouth;
    long numberOfSubsets, i, latRank, lonRank;
    grib_iarray* subsets;
    long* subsets_ar = 0;
    size_t nsubsets  = 0;
    char latstr[32]  = {0,};
    char lonstr[32] = {0,};

    ret = grib_get_long(h, "compressedData", &compressed);
    if (ret)
        return ret;

    ret = grib_get_long(h, self->numberOfSubsets, &numberOfSubsets);
    if (ret)
        return ret;

    subsets = grib_iarray_new(c, numberOfSubsets, 10);

    ret = grib_set_long(h, "unpack", 1);
    if (ret)
        return ret;

    if (compressed) {
        ret = grib_get_long(h, self->extractAreaLongitudeRank, &lonRank);
        if (ret)
            return ret;
        sprintf(lonstr, "#%ld#longitude", lonRank);
        ret = grib_get_long(h, self->extractAreaLatitudeRank, &latRank);
        if (ret)
            return ret;
        sprintf(latstr, "#%ld#latitude", latRank);
    }

    /* Latitudes */
    n   = numberOfSubsets;
    lat = (double*)grib_context_malloc_clear(c, sizeof(double) * numberOfSubsets);
    if (compressed) {
        ret = grib_get_double_array(h, latstr, lat, &n);
        if (ret)
            return ret;
        if (!(n == 1 || n == numberOfSubsets)) {
            /* n can be 1 if all latitudes are the same */
            return GRIB_INTERNAL_ERROR;
        }
        if (n == 1) {
            fill_in(lat, numberOfSubsets);
        }
    }
    else {
        size_t values_len = 0;
        for (i = 0; i < numberOfSubsets; ++i) {
            sprintf(latstr, "#%ld#latitude", i + 1);
            ret = grib_get_size(h, latstr, &values_len);
            if (ret)
                return ret;
            if (values_len > 1)
                return GRIB_NOT_IMPLEMENTED;
            ret = grib_get_double(h, latstr, &(lat[i]));
            if (ret)
                return ret;
        }
    }

    /* Longitudes */
    n   = numberOfSubsets;
    lon = (double*)grib_context_malloc_clear(c, sizeof(double) * numberOfSubsets);
    if (compressed) {
        ret = grib_get_double_array(h, lonstr, lon, &n);
        if (ret)
            return ret;
        if (!(n == 1 || n == numberOfSubsets)) {
            /* n can be 1 if all longitudes are the same */
            return GRIB_INTERNAL_ERROR;
        }
        if (n == 1) {
            fill_in(lon, numberOfSubsets);
        }
    }
    else {
        size_t values_len = 0;
        for (i = 0; i < numberOfSubsets; ++i) {
            sprintf(lonstr, "#%ld#longitude", i + 1);
            ret = grib_get_size(h, lonstr, &values_len);
            if (ret)
                return ret;
            if (values_len > 1)
                return GRIB_NOT_IMPLEMENTED;
            ret = grib_get_double(h, lonstr, &(lon[i]));
            if (ret)
                return ret;
        }
    }

    ret = grib_get_double(h, self->extractAreaWestLongitude, &lonWest);
    if (ret)
        return ret;
    ret = grib_get_double(h, self->extractAreaEastLongitude, &lonEast);
    if (ret)
        return ret;
    ret = grib_get_double(h, self->extractAreaNorthLatitude, &latNorth);
    if (ret)
        return ret;
    ret = grib_get_double(h, self->extractAreaSouthLatitude, &latSouth);
    if (ret)
        return ret;

    for (i = 0; i < numberOfSubsets; i++) {
        /* printf("++++++ lat: %g <= %g <= %g lon: %g <= %g <= %g \n",latSouth,lat[i],latNorth,lonWest,lon[i],lonEast); */
        if (lat[i] >= latSouth && lat[i] <= latNorth && lon[i] >= lonWest && lon[i] <= lonEast) {
            grib_iarray_push(subsets, i + 1);
            /* printf("++++++++ %ld\n",i+1); */
        }
    }

    nsubsets = grib_iarray_used_size(subsets);
    ret      = grib_set_long(h, self->extractedAreaNumberOfSubsets, nsubsets);
    if (ret)
        return ret;

    if (nsubsets != 0) {
        subsets_ar = grib_iarray_get_array(subsets);
        ret        = grib_set_long_array(h, self->extractSubsetList, subsets_ar, nsubsets);
        grib_context_free(c, subsets_ar);
        if (ret)
            return ret;

        ret = grib_set_long(h, self->doExtractSubsets, 1);
        if (ret)
            return ret;
    }

    grib_context_free(c, lat);
    grib_context_free(c, lon);
    grib_iarray_delete(subsets);
    subsets = 0;

    return ret;
}

static int pack_long(grib_accessor* a, const long* val, size_t* len)
{
    /*grib_accessor_bufr_extract_area_subsets *self =(grib_accessor_bufr_extract_area_subsets*)a;*/

    if (*len == 0)
        return GRIB_SUCCESS;
    return select_area(a);
}
