/**
* 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.
*/

/***************************************************************************
 *   Jean Baptiste Filippi - 01.11.2005                                                           *
 *   Enrico Fucile
 *                                                                         *
 ***************************************************************************/
#include "grib_api_internal.h"
/*
   This is used by make_class.pl

   START_CLASS_DEF
   CLASS      = accessor
   IMPLEMENTS = unpack_long;pack_long; clear
   IMPLEMENTS = unpack_double;pack_double;unpack_double_element
   IMPLEMENTS = unpack_string;pack_string
   IMPLEMENTS = unpack_bytes;pack_bytes
   IMPLEMENTS = unpack_double_subarray 
   IMPLEMENTS = init;dump;destroy
   IMPLEMENTS = get_native_type;sub_section
   IMPLEMENTS = next_offset;value_count;byte_offset;byte_count
   IMPLEMENTS = notify_change;pack_expression
   IMPLEMENTS  = update_size; next; preferred_size
   IMPLEMENTS = compare;is_missing
   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 grib_section* sub_section(grib_accessor* a);
static int  get_native_type(grib_accessor*);
static int is_missing(grib_accessor*);
static int pack_bytes(grib_accessor*,const unsigned char*, size_t *len);
static int pack_double(grib_accessor*, const double* val,size_t *len);
static int pack_long(grib_accessor*, const long* val,size_t *len);
static int pack_string(grib_accessor*, const char*, size_t *len);
static int pack_expression(grib_accessor*, grib_expression*);
static int unpack_bytes (grib_accessor*,unsigned char*, size_t *len);
static int unpack_double(grib_accessor*, double* val,size_t *len);
static int unpack_long(grib_accessor*, long* val,size_t *len);
static int unpack_string (grib_accessor*, char*, size_t *len);
static long byte_count(grib_accessor*);
static long byte_offset(grib_accessor*);
static long next_offset(grib_accessor*);
static long value_count(grib_accessor*);
static void destroy(grib_context*,grib_accessor*);
static void dump(grib_accessor*, grib_dumper*);
static void init(grib_accessor*,const long, grib_arguments* );
static void init_class(grib_accessor_class*);
static int notify_change(grib_accessor*,grib_accessor*);
static void update_size(grib_accessor*,size_t);
static size_t preferred_size(grib_accessor*,int);
static grib_accessor* next(grib_accessor*, int);
static int compare(grib_accessor*, grib_accessor*);
static int unpack_double_element(grib_accessor*,size_t i, double* val);
static int unpack_double_subarray(grib_accessor*, double* val,size_t start,size_t len);
static int clear(grib_accessor*);

typedef struct grib_accessor_gen {
    grib_accessor          att;
/* Members defined in gen */
} grib_accessor_gen;


static grib_accessor_class _grib_accessor_class_gen = {
    0,                      /* super                     */
    "gen",                      /* name                      */
    sizeof(grib_accessor_gen),  /* size                      */
    0,                           /* inited */
    &init_class,                 /* init_class */
    &init,                       /* init                      */
    0,                  /* post_init                      */
    &destroy,                    /* free mem                       */
    &dump,                       /* describes himself         */
    &next_offset,                /* get length of section     */
    &value_count,                /* get number of values      */
    &byte_count,                 /* get number of bytes      */
    &byte_offset,                /* get offset to bytes           */
    &get_native_type,            /* get native type               */
    &sub_section,                /* get sub_section                */
    0,               /* grib_pack procedures long      */
    &is_missing,               /* grib_pack procedures long      */
    &pack_long,                  /* grib_pack procedures long      */
    &unpack_long,                /* grib_unpack procedures long    */
    &pack_double,                /* grib_pack procedures double    */
    &unpack_double,              /* grib_unpack procedures double  */
    &pack_string,                /* grib_pack procedures string    */
    &unpack_string,              /* grib_unpack procedures string  */
    &pack_bytes,                 /* grib_pack procedures bytes     */
    &unpack_bytes,               /* grib_unpack procedures bytes   */
    &pack_expression,            /* pack_expression */
    &notify_change,              /* notify_change   */
    &update_size,                /* update_size   */
    &preferred_size,            /* preferred_size   */
    0,                    /* resize   */
    0,      /* nearest_smaller_value */
    &next,                       /* next accessor    */
    &compare,                    /* compare vs. another accessor   */
    &unpack_double_element,     /* unpack only ith value          */
    &unpack_double_subarray,     /* unpack a subarray         */
    &clear,             		/* clear          */
};


grib_accessor_class* grib_accessor_class_gen = &_grib_accessor_class_gen;


static void init_class(grib_accessor_class* c)
{
}

/* END_CLASS_IMP */

static void init(grib_accessor* a,const long len, grib_arguments* param)
{

 grib_action* act=(grib_action*)(a->creator);
 if (a->flags & GRIB_ACCESSOR_FLAG_TRANSIENT) {
    a->length = 0;
	if (!a->vvalue) 
		a->vvalue = grib_context_malloc_clear(a->parent->h->context,sizeof(grib_virtual_value));
    a->vvalue->type=grib_accessor_get_native_type(a);
    a->vvalue->length=len;
    if (act->default_value!=NULL) {
       const char* p = 0;
       size_t len = 1;
       long l;
       int ret=0;
       double d;
       char tmp[1024];
	   grib_expression* expression=grib_arguments_get_expression(a->parent->h,act->default_value,0);
       int type = grib_expression_native_type(a->parent->h,expression);
       switch(type) {
         case GRIB_TYPE_DOUBLE:
           grib_expression_evaluate_double(a->parent->h,expression,&d);
           grib_pack_double(a,&d,&len);
           break;

         case GRIB_TYPE_LONG:
           grib_expression_evaluate_long(a->parent->h,expression,&l);
           grib_pack_long(a,&l,&len);
           break;

         default:
           len = sizeof(tmp);
           p = grib_expression_evaluate_string(a->parent->h,expression,tmp,&len,&ret);
           if (ret != GRIB_SUCCESS) {
             grib_context_log(a->parent->h->context,GRIB_LOG_ERROR,"unable to evaluate %s as string",a->name);
             Assert(0);
           }
           len = strlen(p)+1;
           grib_pack_string(a,p,&len);
           break;
       }
    }
  } else
    a->length = len;
}

static void dump(grib_accessor* a, grib_dumper* dumper)
{
  if(a->cclass->unpack_string)
    grib_dump_string(dumper,a,NULL);
  else if(a->cclass->unpack_double)
    grib_dump_double(dumper,a,NULL);
  else if(a->cclass->unpack_long)
    grib_dump_long(dumper,a,NULL);
  else
    grib_dump_bytes(dumper,a,NULL);
}

static long next_offset(grib_accessor* a)
{
  return a->offset+a->length;
}

static long value_count(grib_accessor* a)
{
  return 1;
}

static long byte_count(grib_accessor* a)
{
  return a->length;
}

static int  get_native_type(grib_accessor* a){
  grib_context_log(a->parent->h->context,GRIB_LOG_ERROR,
      "Accessor %s [%s] must implement 'get_native_type'", a->name,a->cclass->name);
  return GRIB_TYPE_UNDEFINED;
}

static long byte_offset(grib_accessor* a)
{
  return a->offset;
}

static int unpack_bytes(grib_accessor* a, unsigned char* val, size_t *len)
{
  unsigned char* buf = a->parent->h->buffer->data;
  long length = grib_byte_count(a);
  long offset = grib_byte_offset(a);


  if(*len < length )
  {
    grib_context_log(a->parent->h->context, GRIB_LOG_ERROR, "Wrong size for %s it is %d bytes long\n", a->name ,length );
    *len = length;
    return GRIB_ARRAY_TOO_SMALL;
  }


  memcpy(val,buf + offset,length );
  *len = length;

  return GRIB_SUCCESS;
}

static int clear(grib_accessor* a)
{
  unsigned char* buf = a->parent->h->buffer->data;
  long length = grib_byte_count(a);
  long offset = grib_byte_offset(a);

  memset(buf + offset,0,length);

  return GRIB_SUCCESS;
}

static int  unpack_long   (grib_accessor* a, long*  v, size_t *len){

  if(a->cclass->unpack_double && a->cclass->unpack_double != &unpack_double)
  {
    double val = 0.0;
    size_t l = 1;
    grib_unpack_double (a , &val, &l);
    *v = (long)val;
    grib_context_log(a->parent->h->context,GRIB_LOG_DEBUG, " Casting double %s to long", a->name);
    return GRIB_SUCCESS;
  }

  if(a->cclass->unpack_string && a->cclass->unpack_string != &unpack_string)
  {
    char val[1024];
    size_t l = sizeof(val);
    char  *last = NULL;
    grib_unpack_string (a , val, &l);

    *v = strtol(val,&last,10);

    if(*last == 0)
    {
      grib_context_log(a->parent->h->context,GRIB_LOG_DEBUG, " Casting string %s to long", a->name);
      return GRIB_SUCCESS;
    }
  }

  return GRIB_NOT_IMPLEMENTED;
}

static int unpack_double (grib_accessor* a, double*v, size_t *len){

  if(a->cclass->unpack_long && a->cclass->unpack_long != &unpack_long)
  {
    long val = 0;
    size_t l = 1;
    grib_unpack_long (a , &val, &l);
    *v = val;
    grib_context_log(a->parent->h->context,GRIB_LOG_DEBUG, " Casting long %s to double", a->name);
    return GRIB_SUCCESS;
  }

  if(a->cclass->unpack_string && a->cclass->unpack_string != &unpack_string)
  {
    char val[1024];
    size_t l = sizeof(val);
    char  *last = NULL;
    grib_unpack_string (a , val, &l);

    *v = strtod(val,&last);

    if(*last == 0)
    {
      grib_context_log(a->parent->h->context,GRIB_LOG_DEBUG, " Casting string %s to long", a->name);
      return GRIB_SUCCESS;
    }
  }

  return GRIB_NOT_IMPLEMENTED;
}

static int unpack_string(grib_accessor*a , char*  v, size_t *len){

  if(a->cclass->unpack_double && a->cclass->unpack_double != &unpack_double)
  {
    double val = 0.0;
    size_t l = 1;
    grib_unpack_double (a , &val, &l);
    sprintf(v,"%g",val);
    *len = strlen(v);
    grib_context_log(a->parent->h->context,GRIB_LOG_DEBUG, " Casting double %s to string", a->name);
    return GRIB_SUCCESS;
  }

  if(a->cclass->unpack_long && a->cclass->unpack_long != &unpack_long)
  {
    long val = 0;
    size_t l = 1;
    grib_unpack_long (a , &val, &l);
    sprintf(v,"%ld",val);
    *len = strlen(v);
    grib_context_log(a->parent->h->context,GRIB_LOG_DEBUG, " Casting long %s to string  \n", a->name);
    return GRIB_SUCCESS;
  }

  return GRIB_NOT_IMPLEMENTED;
}

static int pack_expression(grib_accessor* a, grib_expression *e){
  size_t len = 1;
  long   lval;
  double   dval;
  const char    *cval;
  int ret=0;
  char tmp[1024];

  switch(grib_accessor_get_native_type(a))
  {
    case GRIB_TYPE_LONG:
      len = 1;
      ret = grib_expression_evaluate_long(a->parent->h,e,&lval);
      if (ret != GRIB_SUCCESS) {
        grib_context_log(a->parent->h->context,GRIB_LOG_ERROR,"unable to set %s as long",a->name);
        return ret;
      }
      return grib_pack_long(a,&lval,&len);
      break;

    case GRIB_TYPE_DOUBLE:
      len = 1;
      ret = grib_expression_evaluate_double(a->parent->h,e,&dval);
      return grib_pack_double(a,&dval,&len);
      break;

    case GRIB_TYPE_STRING:
      len = sizeof(tmp);
      cval = grib_expression_evaluate_string(a->parent->h,e,tmp,&len,&ret);
      if (ret != GRIB_SUCCESS) {
        grib_context_log(a->parent->h->context,GRIB_LOG_ERROR,"unable to set %s as string",a->name);
        return ret;
      }
      len = strlen(cval);
      return grib_pack_string(a,cval,&len);
      break;
  }

  return GRIB_NOT_IMPLEMENTED;
}

static int pack_long(grib_accessor* a, const long*  v, size_t *len){
  grib_context* c=a->parent->h->context;
  if(a->cclass->pack_double && a->cclass->pack_double != &pack_double)
  {
    int i=0,ret=0;
    double* val = (double*)grib_context_malloc(c,*len*(sizeof(double))) ;
    if (!val) {
      grib_context_log(c,GRIB_LOG_ERROR,
       "unable to allocate %d bytes\n",(int)(*len*(sizeof(double))));
      return GRIB_OUT_OF_MEMORY;
    }
    for (i=0;i<*len;i++) val[i]=(long)v[i];
    ret=grib_pack_double (a , val, len);
    grib_context_free(c,val);
    return ret;
  }
  grib_context_log(c,GRIB_LOG_ERROR, " Should not grib_pack %s as long", a->name);
  Assert(0);
  return GRIB_NOT_IMPLEMENTED;
}

static int pack_double(grib_accessor* a, const double *v, size_t *len){
  grib_context* c=a->parent->h->context;
  if(a->cclass->pack_long && a->cclass->pack_long != &pack_long)
  {
    int i=0,ret=0;
    long* val = (long*)grib_context_malloc(c,*len*(sizeof(long))) ;
    if (!val) {
      grib_context_log(c,GRIB_LOG_ERROR,
       "unable to allocate %d bytes\n",(int)(*len*(sizeof(long))));
      return GRIB_OUT_OF_MEMORY;
    }
    for (i=0;i<*len;i++) val[i]=(long)v[i];
    ret=grib_pack_long (a , val, len);
    grib_context_free(c,val);
    return ret;
  }
  grib_context_log(c,GRIB_LOG_ERROR, " Should not grib_pack %s  as double", a->name);
  return GRIB_NOT_IMPLEMENTED;
}

static int pack_string(grib_accessor*a , const char*  v, size_t *len){
  if(a->cclass->pack_double && a->cclass->pack_double != &pack_double)
  {
    size_t l = 1;
    double val = atof(v);
    return grib_pack_double (a , &val, &l);
  }

  if(a->cclass->pack_long && a->cclass->pack_long != &pack_long)
  {
    size_t l = 1;
    long val = atof(v);
    return grib_pack_long (a , &val, &l);
  }

  grib_context_log(a->parent->h->context,GRIB_LOG_ERROR,
      " Should not grib_pack %s  as string", a->name);
  return GRIB_NOT_IMPLEMENTED;
}

static int pack_bytes(grib_accessor* a, const unsigned char* val, size_t *len)
{
  size_t length = *len;
  grib_buffer_replace(a, val, length,1,1);
  return GRIB_SUCCESS;
}

static void destroy(grib_context* ct, grib_accessor* a)
{
  grib_dependency_remove_observed(a);
  grib_dependency_remove_observer(a);
  if (a->vvalue!=NULL) {
  	grib_context_free(ct,a->vvalue);
	a->vvalue=NULL;
  }
}

static grib_section* sub_section(grib_accessor* a)
{
  return NULL;
}

static int notify_change(grib_accessor* self,grib_accessor* observed)
{
  /* Default behaviour is to notify creator */
  return grib_action_notify_change(self->creator,self,observed);
}

static void update_size(grib_accessor* a,size_t s)
{
  grib_context_log(a->parent->h->context,GRIB_LOG_ERROR,
      "Accessor %s [%s] must implement 'update_size'", a->name,a->cclass->name);
  Assert(0 == 1);
}

static grib_accessor* next(grib_accessor* a, int mod) {
   grib_accessor* next=NULL;
   if (a->next) {
     next=a->next;
   } else {
     if (a->parent->owner)
      next=a->parent->owner->cclass->next(a->parent->owner,0);
   }
   return next;
}


static int compare(grib_accessor* a, grib_accessor* b) {
  return GRIB_NOT_IMPLEMENTED;
}

/* Redefined in all padding */

static size_t preferred_size(grib_accessor* a,int from_handle)
{
  return a->length;
}

static int is_missing(grib_accessor* a){
    int i=0;
    int is_missing=1;
    unsigned char ones=0xff;
    unsigned char* v=NULL;

    if (a->flags & GRIB_ACCESSOR_FLAG_TRANSIENT) {
	  if (a->vvalue == NULL) {
	    grib_context_log(a->parent->h->context,GRIB_LOG_ERROR,"%s internal error (flags=0x%X)",a->name,a->flags);
	  }
	  Assert(a->vvalue!=NULL);
	  return a->vvalue->missing;
	}
    Assert(a->length>=0);

    v=a->parent->h->buffer->data+a->offset;

    for (i=0; i < a->length; i++) {
      if (*v != ones) {
        is_missing=0;
        break;
      }
      v++;
    }

    return is_missing;
}

static int unpack_double_element(grib_accessor* a, size_t i, double* val) {
  return GRIB_NOT_IMPLEMENTED;
}

static int unpack_double_subarray(grib_accessor* a, double* val,size_t start,size_t len) {
  return GRIB_NOT_IMPLEMENTED;
}

