/*
 * (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
   MEMBERS=const char*                  N
   MEMBERS=const char*                  Ni
   MEMBERS=const char*                  di
   MEMBERS=const char*                  latfirst
   MEMBERS=const char*                  lonfirst
   MEMBERS=const char*                  latlast
   MEMBERS=const char*                  lonlast
   MEMBERS=const char*                  plpresent
   MEMBERS=const char*                  pl
   MEMBERS=const char*                  basic_angle
   MEMBERS=const char*                  subdivision
   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_long(grib_accessor*, const long* val, size_t* len);
static int unpack_long(grib_accessor*, 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_global_gaussian
{
    grib_accessor att;
    /* Members defined in gen */
    /* Members defined in long */
    /* Members defined in global_gaussian */
    const char* N;
    const char* Ni;
    const char* di;
    const char* latfirst;
    const char* lonfirst;
    const char* latlast;
    const char* lonlast;
    const char* plpresent;
    const char* pl;
    const char* basic_angle;
    const char* subdivision;
} grib_accessor_global_gaussian;

extern grib_accessor_class* grib_accessor_class_long;

static grib_accessor_class _grib_accessor_class_global_gaussian = {
    &grib_accessor_class_long,             /* super                     */
    "global_gaussian",                     /* name                      */
    sizeof(grib_accessor_global_gaussian), /* 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           */
    0,                                     /* get native type               */
    0,                                     /* get sub_section                */
    0,                                     /* grib_pack procedures long      */
    0,                                     /* 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   */
    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_global_gaussian = &_grib_accessor_class_global_gaussian;


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->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_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 l, grib_arguments* c)
{
    grib_accessor_global_gaussian* self = (grib_accessor_global_gaussian*)a;
    int n                               = 0;
    grib_handle* h                      = grib_handle_of_accessor(a);

    self->N           = grib_arguments_get_name(h, c, n++);
    self->Ni          = grib_arguments_get_name(h, c, n++);
    self->di          = grib_arguments_get_name(h, c, n++);
    self->latfirst    = grib_arguments_get_name(h, c, n++);
    self->lonfirst    = grib_arguments_get_name(h, c, n++);
    self->latlast     = grib_arguments_get_name(h, c, n++);
    self->lonlast     = grib_arguments_get_name(h, c, n++);
    self->plpresent   = grib_arguments_get_name(h, c, n++);
    self->pl          = grib_arguments_get_name(h, c, n++);
    self->basic_angle = grib_arguments_get_name(h, c, n++);
    self->subdivision = grib_arguments_get_name(h, c, n++);
}

static int unpack_long(grib_accessor* a, long* val, size_t* len)
{
    grib_accessor_global_gaussian* self = (grib_accessor_global_gaussian*)a;
    int ret                             = GRIB_SUCCESS;
    long latfirst, latlast, lonfirst, lonlast, basic_angle, subdivision, N, Ni;
    double dlatfirst, dlatlast, dlonfirst, dlonlast;
    double angular_precision = 0;
    double* lats             = NULL;
    long factor = 1000, plpresent = 0;
    long max_pl     = 0; /* max. element of pl array */
    grib_context* c = a->context;
    grib_handle* h  = grib_handle_of_accessor(a);

    if (self->basic_angle && self->subdivision) {
        factor = 1000000;
        if ((ret = grib_get_long_internal(h, self->basic_angle, &basic_angle)) != GRIB_SUCCESS)
            return ret;

        if ((ret = grib_get_long_internal(h, self->subdivision, &subdivision)) != GRIB_SUCCESS)
            return ret;

        if ((basic_angle != 0 && basic_angle != GRIB_MISSING_LONG) ||
            (subdivision != 0 && subdivision != GRIB_MISSING_LONG)) {
            *val = 0;
            return ret;
        }
    }
    else {
        factor = 1000;
    }
    angular_precision = 1.0 / factor;

    if ((ret = grib_get_long_internal(h, self->N, &N)) != GRIB_SUCCESS)
        return ret;

    if ((ret = grib_get_long_internal(h, self->Ni, &Ni)) != GRIB_SUCCESS)
        return ret;

    if ((ret = grib_get_long_internal(h, self->latfirst, &latfirst)) != GRIB_SUCCESS)
        return ret;

    if ((ret = grib_get_long_internal(h, self->lonfirst, &lonfirst)) != GRIB_SUCCESS)
        return ret;

    if ((ret = grib_get_long_internal(h, self->latlast, &latlast)) != GRIB_SUCCESS)
        return ret;

    if ((ret = grib_get_long_internal(h, self->lonlast, &lonlast)) != GRIB_SUCCESS)
        return ret;

    if ((ret = grib_get_long_internal(h, self->plpresent, &plpresent)) != GRIB_SUCCESS)
        return ret;

    dlatfirst = ((double)latfirst) / factor;
    dlatlast  = ((double)latlast) / factor;
    dlonfirst = ((double)lonfirst) / factor;
    dlonlast  = ((double)lonlast) / factor;

    if (N == 0) {
        grib_context_log(c, GRIB_LOG_ERROR, "global_gaussian unpack_long: N cannot be 0!");
        return GRIB_WRONG_GRID;
    }

    lats = (double*)grib_context_malloc(c, sizeof(double) * N * 2);
    if (!lats) {
        grib_context_log(c, GRIB_LOG_ERROR,
                         "global_gaussian unpack_long: Memory allocation error: %ld bytes", sizeof(double) * N * 2);
        return GRIB_OUT_OF_MEMORY;
    }
    if ((ret = grib_get_gaussian_latitudes(N, lats)) != GRIB_SUCCESS)
        return ret;

    /* GRIB-704: Work out the maximum element in pl array, if present */
    max_pl = 4 * N; /* default */
    if (plpresent) {
        size_t plsize = 0, i = 0;
        long* pl = NULL; /* pl array */
        if ((ret = grib_get_size(h, self->pl, &plsize)) != GRIB_SUCCESS)
            return ret;
        Assert(plsize);
        pl = (long*)grib_context_malloc_clear(c, sizeof(long) * plsize);
        grib_get_long_array_internal(h, self->pl, pl, &plsize);

        max_pl = pl[0];
        for (i = 1; i < plsize; i++) {
            if (pl[i] > max_pl)
                max_pl = pl[i];
        }
        grib_context_free(c, pl);
    }

    /* If Ni is missing, then this is a reduced gaussian grid */
    if (Ni == GRIB_MISSING_LONG)
        Ni = max_pl;

    if (is_gaussian_global(dlatfirst, dlatlast, dlonfirst, dlonlast, Ni, lats, angular_precision)) {
        *val = 1; /* global */
    }
    else {
        *val = 0; /* not global */
    }

    grib_context_free(c, lats);

    return ret;
}

static int pack_long(grib_accessor* a, const long* val, size_t* len)
{
    grib_accessor_global_gaussian* self = (grib_accessor_global_gaussian*)a;
    int ret                             = GRIB_SUCCESS;
    long latfirst, latlast, lonfirst, lonlast, di, diold, basic_angle = 0, N, Ni;
    long factor;
    double* lats;
    double ddi, dlonlast;
    double dfactor, dNi;
    long plpresent  = 0;
    grib_context* c = a->context;
    grib_handle* h  = grib_handle_of_accessor(a);

    if (*val == 0)
        return ret;

    if (self->basic_angle) {
        factor = 1000000;
        if ((ret = grib_set_missing(h, self->subdivision)) != GRIB_SUCCESS)
            return ret;

        if ((ret = grib_set_long_internal(h, self->basic_angle, basic_angle)) != GRIB_SUCCESS)
            return ret;
    }
    else
        factor = 1000;

    if ((ret = grib_get_long_internal(h, self->N, &N)) != GRIB_SUCCESS)
        return ret;
    if (N == 0)
        return ret;

    if ((ret = grib_get_long_internal(h, self->Ni, &Ni)) != GRIB_SUCCESS)
        return ret;
    if (Ni == GRIB_MISSING_LONG)
        Ni = N * 4;
    if (Ni == 0)
        return ret;

    if ((ret = grib_get_long_internal(h, self->di, &diold)) != GRIB_SUCCESS)
        return ret;

    lats = (double*)grib_context_malloc(c, sizeof(double) * N * 2);
    if (!lats) {
        grib_context_log(c, GRIB_LOG_FATAL,
                         "global_gaussian pack_long: Memory allocation error: %ld bytes", sizeof(double) * N * 2);
        return GRIB_OUT_OF_MEMORY;
    }
    if ((ret = grib_get_gaussian_latitudes(N, lats)) != GRIB_SUCCESS)
        return ret;

    if ((ret = grib_get_long_internal(h, self->plpresent, &plpresent)) != GRIB_SUCCESS)
        return ret;

    /* GRIB-854: For octahedral grids, get max of pl array */
    if (plpresent) {
        size_t plsize = 0, i = 0;
        long* pl    = NULL; /* pl array */
        long max_pl = 0;    /* max. element of pl array */

        if ((ret = grib_get_size(h, self->pl, &plsize)) != GRIB_SUCCESS)
            return ret;
        Assert(plsize);
        pl = (long*)grib_context_malloc_clear(c, sizeof(long) * plsize);
        grib_get_long_array_internal(h, self->pl, pl, &plsize);

        max_pl = pl[0];
        for (i = 1; i < plsize; i++) {
            Assert(pl[i] > 0);
            if (pl[i] > max_pl)
                max_pl = pl[i];
        }
        grib_context_free(c, pl);
        Ni = max_pl;
    }

    /* rounding */
    latfirst = (long)(lats[0] * factor + 0.5);
    latlast  = -latfirst;
    lonfirst = 0;
    dfactor  = (double)factor;
    dNi      = (double)Ni;
    ddi      = (360.0 * dfactor) / dNi;
    dlonlast = (360.0 * dfactor) - ddi + 0.5;
    ddi      = ddi + 0.5;
    di       = ddi;
    lonlast  = dlonlast;

    grib_context_free(c, lats);

    if ((ret = grib_set_long_internal(h, self->latfirst, latfirst)) != GRIB_SUCCESS)
        return ret;

    if ((ret = grib_set_long_internal(h, self->lonfirst, lonfirst)) != GRIB_SUCCESS)
        return ret;

    if ((ret = grib_set_long_internal(h, self->latlast, latlast)) != GRIB_SUCCESS)
        return ret;

    if ((ret = grib_set_long_internal(h, self->lonlast, lonlast)) != GRIB_SUCCESS)
        return ret;

    if (diold != GRIB_MISSING_LONG)
        if ((ret = grib_set_long_internal(h, self->di, di)) != GRIB_SUCCESS)
            return ret;

    return GRIB_SUCCESS;
}
