/**
* Copyright 2005-2007 ECMWF
*
* Licensed under the GNU Lesser General Public License which
* incorporates the terms and conditions of version 3 of the GNU
* General Public License.
* See LICENSE and gpl-3.0.txt for details.
*/

/********************************
 *  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;is_missing
   IMPLEMENTS = init
   MEMBERS=const char*                  directionIncrementGiven
   MEMBERS=const char*                  directionIncrement
   MEMBERS=const char*                  scansPositively
   MEMBERS=const char*                  first
   MEMBERS=const char*                  last
   MEMBERS=const char*                  numberOfPoints
   MEMBERS=const char*                  angleMultiplier
   MEMBERS=const char*                  angleDivisor
   MEMBERS=long                   isLongitude
   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_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_latlon_increment {
    grib_accessor          att;
/* Members defined in gen */
/* Members defined in double */
/* Members defined in latlon_increment */
	const char*                  directionIncrementGiven;
	const char*                  directionIncrement;
	const char*                  scansPositively;
	const char*                  first;
	const char*                  last;
	const char*                  numberOfPoints;
	const char*                  angleMultiplier;
	const char*                  angleDivisor;
	long                   isLongitude;
} grib_accessor_latlon_increment;

extern grib_accessor_class* grib_accessor_class_double;

static grib_accessor_class _grib_accessor_class_latlon_increment = {
    &grib_accessor_class_double,                      /* super                     */
    "latlon_increment",                      /* name                      */
    sizeof(grib_accessor_latlon_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 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      */
    &is_missing,               /* 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 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          */
};


grib_accessor_class* grib_accessor_class_latlon_increment = &_grib_accessor_class_latlon_increment;


static void init_class(grib_accessor_class* c)
{
	c->dump	=	(*(c->super))->dump;
	c->next_offset	=	(*(c->super))->next_offset;
	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->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_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;
}

/* END_CLASS_IMP */

static void init(grib_accessor* a,const long l, grib_arguments* c)
{
  grib_accessor_latlon_increment* self = (grib_accessor_latlon_increment*)a;
  int n = 0;

  self->directionIncrementGiven = grib_arguments_get_name(a->parent->h,c,n++);
  self->directionIncrement    = grib_arguments_get_name(a->parent->h,c,n++);
  self->scansPositively    = grib_arguments_get_name(a->parent->h,c,n++);
  self->first = grib_arguments_get_name(a->parent->h,c,n++);
  self->last    = grib_arguments_get_name(a->parent->h,c,n++);
  self->numberOfPoints    = grib_arguments_get_name(a->parent->h,c,n++);
  self->angleMultiplier    = grib_arguments_get_name(a->parent->h,c,n++);
  self->angleDivisor   = grib_arguments_get_name(a->parent->h,c,n++);
  self->isLongitude=grib_arguments_get_long(a->parent->h, c,n++);
}

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

  long directionIncrementGiven=0;
  long directionIncrement=0;
  long angleDivisor=1;
  long angleMultiplier=1;
  double first = 0;
  double last = 0;
  long numberOfPoints = 0;
  long scansPositively = 0;

  if(*len < 1) return GRIB_ARRAY_TOO_SMALL;

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

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

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

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

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

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

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

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

  if (self->isLongitude) {
    if (last < first && scansPositively) last+=360;
    if (last > first && !scansPositively) first-=360;
  }

  if (!directionIncrementGiven && numberOfPoints != GRIB_MISSING_LONG) {
    *val = fabs(last-first)/(double)(numberOfPoints-1);
  } else if (numberOfPoints == GRIB_MISSING_LONG){
    *val = GRIB_MISSING_DOUBLE;
  } else {
    Assert(angleDivisor!=0);
    *val = (double)directionIncrement/angleDivisor*angleMultiplier;
  }

#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_latlon_increment* self = (grib_accessor_latlon_increment*)a;
  int ret = 0;
  long codedNumberOfPoints=0;

  long directionIncrementGiven=0;
  long directionIncrement=0;
  long angleDivisor=1;
  long angleMultiplier=1;
  double first = 0;
  double last = 0;
  long numberOfPoints = 0;
  long numberOfPointsInternal = 0;
  long scansPositively = 0;
  double directionIncrementDouble=0;

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

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

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

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

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

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

  if (self->isLongitude) {
    if (last < first && scansPositively) last+=360;
    if (last > first && !scansPositively) first-=360;
  }

  if (*val == GRIB_MISSING_DOUBLE) {
    directionIncrement=GRIB_MISSING_LONG;
    directionIncrementGiven=1;
    numberOfPoints=GRIB_MISSING_LONG;
  } else {
    numberOfPointsInternal = 1+rint(fabs((last-first) / *val));

    directionIncrementDouble = rint (*val * (double)angleDivisor / (double)angleMultiplier);

	directionIncrement=(long)directionIncrementDouble;
    if (directionIncrement == 0 ) {
      directionIncrement=GRIB_MISSING_LONG;
      directionIncrementGiven=0;
    }
  }


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


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

  ret = grib_set_long_internal(a->parent->h, self->directionIncrement,directionIncrement);
  if(ret ) return ret;

  ret = grib_set_long_internal(a->parent->h, self->directionIncrementGiven,directionIncrementGiven);
  if(ret )return ret;

#if 0
  printf("pack -- %s=%ld %s=%ld \n ------- %s=%f %s=%f \n ------- %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;
}

static int is_missing(grib_accessor* a){

  size_t len=1;
  double val=0;

  unpack_double(a, &val, &len);

  return (val == GRIB_MISSING_DOUBLE);
}