/*
 * Copyright 2005-2018 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"
/* 
   This is used by make_class.pl

   START_CLASS_DEF
   CLASS      = accessor
   SUPER      = grib_accessor_class_double
   IMPLEMENTS = unpack_double;pack_double
   IMPLEMENTS = init
   MEMBERS=const char*                  directionIncrementGiven
   MEMBERS=const char*                  directionIncrement
   MEMBERS=const char*                  first
   MEMBERS=const char*                  last
   MEMBERS=const char*                  numberOfPoints
   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 void init(grib_accessor*,const long, grib_arguments* );
static void init_class(grib_accessor_class*);

typedef struct grib_accessor_g1_increment {
    grib_accessor          att;
/* Members defined in gen */
/* Members defined in double */
/* Members defined in g1_increment */
	const char*                  directionIncrementGiven;
	const char*                  directionIncrement;
	const char*                  first;
	const char*                  last;
	const char*                  numberOfPoints;
} grib_accessor_g1_increment;

extern grib_accessor_class* grib_accessor_class_double;

static grib_accessor_class _grib_accessor_class_g1_increment = {
    &grib_accessor_class_double,                      /* super                     */
    "g1_increment",                      /* name                      */
    sizeof(grib_accessor_g1_increment),  /* 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      */
    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   */
    0,     /* unpack only ith value          */
    0,     /* unpack a subarray         */
    0,              		/* clear          */
    0,               		/* clone accessor          */
};


grib_accessor_class* grib_accessor_class_g1_increment = &_grib_accessor_class_g1_increment;


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_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_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_g1_increment* self = (grib_accessor_g1_increment*)a;
    int n = 0;

    self->directionIncrementGiven = grib_arguments_get_name(grib_handle_of_accessor(a),c,n++);
    self->directionIncrement    = grib_arguments_get_name(grib_handle_of_accessor(a),c,n++);
    self->first = grib_arguments_get_name(grib_handle_of_accessor(a),c,n++);
    self->last    = grib_arguments_get_name(grib_handle_of_accessor(a),c,n++);
    self->numberOfPoints    = grib_arguments_get_name(grib_handle_of_accessor(a),c,n++);
}

static int    unpack_double   (grib_accessor* a, double* val, size_t *len)
{
    grib_accessor_g1_increment* self = (grib_accessor_g1_increment*)a;
    int ret = 0;

    long directionIncrementGiven=0;
    long directionIncrement;
    double first = 0;
    double last = 0;
    long numberOfPoints = 0;

    if(*len < 1)
        ret = GRIB_ARRAY_TOO_SMALL;

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

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

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

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

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

    if (!directionIncrementGiven || directionIncrement == GRIB_MISSING_LONG) {
        *val = fabs(last-first)/(double)(numberOfPoints-1);
    } else {
        *val = (double)directionIncrement/1000.0;
    }

#if 0
    printf("unpack -- %s=%ld %s=%ld %s=%f %s=%f %s=%ld %s=%f\n",
            self->directionIncrementGiven,directionIncrementGiven,
            self->directionIncrement,directionIncrement,
            self->last,last,
            self->first,first,
            self->numberOfPoints,numberOfPoints,
            a->name,*val);
#endif
    if (ret == GRIB_SUCCESS) *len = 1;

    return ret;
} 


static int pack_double(grib_accessor* a, const double* val, size_t *len)
{
    grib_accessor_g1_increment* self = (grib_accessor_g1_increment*)a;
    int ret = 0;
    long codedNumberOfPoints=0;

    long directionIncrementGiven=0;
    long directionIncrement;
    double first = 0;
    double last = 0;
    long numberOfPoints = 0;
    double incrementInMillidegrees;

    ret = grib_get_double_internal(grib_handle_of_accessor(a), self->first,&first);
    if(ret != GRIB_SUCCESS) {
        grib_context_log(a->context, GRIB_LOG_ERROR, "Accessor %s cannont gather value for %s error %d \n", a->name, self->first, ret);
        return ret;
    }
    ret = grib_get_double_internal(grib_handle_of_accessor(a), self->last,&last);
    if(ret != GRIB_SUCCESS){
        grib_context_log(a->context, GRIB_LOG_ERROR, "Accessor %s cannont gather value for %s error %d \n", a->name, self->last, ret);
        return ret;
    }

    if((ret = grib_get_long_internal(grib_handle_of_accessor(a), self->directionIncrementGiven,&directionIncrementGiven))
            != GRIB_SUCCESS){
        grib_context_log(a->context, GRIB_LOG_ERROR, "Accessor %s cannont gather value for %s error %d \n", a->name, self->directionIncrementGiven, ret);
        return ret;
    }

    numberOfPoints = 1+rint(fabs((last-first) / *val));

    incrementInMillidegrees = *val * 1000;
    if ((int)incrementInMillidegrees ==  incrementInMillidegrees ) {
        directionIncrement=(int)incrementInMillidegrees;
    } else {
        directionIncrement=0xffffff;
        directionIncrementGiven=0;
    }

    ret = grib_set_long_internal(grib_handle_of_accessor(a), self->numberOfPoints,numberOfPoints);
    if(ret )
        grib_context_log(a->context, GRIB_LOG_ERROR, "Accessor %s cannont pack value for %s error %d \n", a->name, self->numberOfPoints, ret);


    grib_get_long_internal(grib_handle_of_accessor(a), self->numberOfPoints,&codedNumberOfPoints);


    ret = grib_set_long_internal(grib_handle_of_accessor(a), self->directionIncrement,directionIncrement);
    if(ret )
        grib_context_log(a->context, GRIB_LOG_ERROR, "Accessor %s cannont pack value for %s error %d \n", a->name, self->directionIncrement, ret);

    ret = grib_set_long_internal(grib_handle_of_accessor(a), self->directionIncrementGiven,directionIncrementGiven);
    if(ret )
        grib_context_log(a->context, GRIB_LOG_ERROR, "Accessor %s cannont pack value for %s error %d \n", a->name, self->directionIncrementGiven, ret);

#if 0
    printf("pack -- %s=%ld %s=%ld %s=%f %s=%f %s=%ld codedNumberOfPoints=%ld %s=%f\n",
            self->directionIncrementGiven,directionIncrementGiven,
            self->directionIncrement,directionIncrement,
            self->last,last,
            self->first,first,
            self->numberOfPoints,numberOfPoints,
            codedNumberOfPoints,
            a->name,*val);
#endif


    if (ret == GRIB_SUCCESS) *len = 1;

    return ret;
}

