/*
 * Copyright 2005-2016 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.
 */

/***************************************************************************
 *   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;string_length
   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 size_t string_length(grib_accessor*);
static long byte_count(grib_accessor*);
static long byte_offset(grib_accessor*);
static long next_offset(grib_accessor*);
static int value_count(grib_accessor*,long*);
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     */
    &string_length,              /* get length of string      */
    &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_virtual_value*)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 int value_count(grib_accessor* a, long* count)
{
    *count=1;
    return 0;
}

static size_t string_length(grib_accessor* a)
{
    return 1024;
}

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;
}
