/*
 * (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      = expression
   IMPLEMENTS = destroy
   IMPLEMENTS = native_type
   IMPLEMENTS = get_name
   IMPLEMENTS = evaluate_long
   IMPLEMENTS = evaluate_double
   IMPLEMENTS = evaluate_string
   IMPLEMENTS = print
   IMPLEMENTS = add_dependency
   MEMBERS    = const char *name
   MEMBERS    = const char *list
   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 "expression.class" and rerun ./make_class.pl

*/

typedef const char* string; /* to keep make_class.pl happy */

static void    destroy(grib_context*,grib_expression* e);
static void    print(grib_context*, grib_expression*, grib_handle*, FILE*);
static void    add_dependency(grib_expression* e, grib_accessor* observer);
static string  get_name(grib_expression* e);
static int     native_type(grib_expression*,grib_handle*);
static int     evaluate_long(grib_expression*,grib_handle*,long*);
static int     evaluate_double(grib_expression*,grib_handle*,double*);
static string  evaluate_string(grib_expression*,grib_handle*,char*,size_t*,int*);

typedef struct grib_expression_is_in_list{
  grib_expression base;
    /* Members defined in is_in_list */
    const char *name;
    const char *list;
} grib_expression_is_in_list;


static grib_expression_class _grib_expression_class_is_in_list = {
    0,                      /* super */
    "is_in_list",                      /* name  */
    sizeof(grib_expression_is_in_list),/* size of instance */
    0,                           /* inited */
    0,                       /* constructor */
    &destroy,                    /* destructor */
    &print,
    &add_dependency,
    &native_type,
    &get_name,
    &evaluate_long,
    &evaluate_double,
    &evaluate_string,
};

grib_expression_class* grib_expression_class_is_in_list = &_grib_expression_class_is_in_list;

/* END_CLASS_IMP */


static grib_trie* load_list(grib_context* c, grib_expression* e, int* err)
{
    grib_expression_is_in_list* self = (grib_expression_is_in_list*)e;

    char* filename  = NULL;
    char line[1024] = {0,};
    grib_trie* list = NULL;
    FILE* f         = NULL;

    *err = GRIB_SUCCESS;

    filename = grib_context_full_defs_path(c, self->list);
    if (!filename) {
        grib_context_log(c, GRIB_LOG_ERROR, "unable to find def file %s", self->list);
        *err = GRIB_FILE_NOT_FOUND;
        return NULL;
    }
    else {
        grib_context_log(c, GRIB_LOG_DEBUG, "is_in_list: found def file %s", filename);
    }
    list = (grib_trie*)grib_trie_get(c->lists, filename);
    if (list) {
        grib_context_log(c, GRIB_LOG_DEBUG, "using list %s from cache", self->list);
        return list;
    }
    else {
        grib_context_log(c, GRIB_LOG_DEBUG, "using list %s from file %s", self->list, filename);
    }

    f = codes_fopen(filename, "r");
    if (!f) {
        *err = GRIB_IO_PROBLEM;
        return NULL;
    }

    list = grib_trie_new(c);

    while (fgets(line, sizeof(line) - 1, f)) {
        unsigned char* p = (unsigned char*)line;
        while (*p != 0) {
            if (*p < 33) {
                *p = 0;
                break;
            }
            p++;
        }
        grib_trie_insert(list, line, line);
    }

    grib_trie_insert(c->lists, filename, list);

    fclose(f);

    return list;
}

static const char* get_name(grib_expression* g)
{
    const grib_expression_is_in_list* e = (grib_expression_is_in_list*)g;
    return e->name;
}

static int evaluate_long(grib_expression* g, grib_handle* h, long* result)
{
    const grib_expression_is_in_list* e = (grib_expression_is_in_list*)g;
    int err = 0;
    char mybuf[1024] = {0,};
    size_t size = 1024;

    grib_trie* list = load_list(h->context, g, &err);

    if ((err = grib_get_string_internal(h, e->name, mybuf, &size)) != GRIB_SUCCESS)
        return err;

    if (grib_trie_get(list, mybuf))
        *result = 1;
    else
        *result = 0;

    return err;
}

static int evaluate_double(grib_expression* g, grib_handle* h, double* result)
{
    return GRIB_NOT_IMPLEMENTED;
    // grib_expression_is_in_list* e = (grib_expression_is_in_list*)g;
    // int err                       = 0;
    // char mybuf[1024]              = {0,};
    // size_t size = 1024;
    // grib_trie* list = load_list(h->context, g, &err);
    // if ((err = grib_get_string_internal(h, e->name, mybuf, &size)) != GRIB_SUCCESS)
    //     return err;
    // if (grib_trie_get(list, mybuf))
    //     *result = 1;
    // else
    //     *result = 0;
    // return err;
}

static string evaluate_string(grib_expression* g, grib_handle* h, char* buf, size_t* size, int* err)
{
    const grib_expression_is_in_list* e = (grib_expression_is_in_list*)g;
    char mybuf[1024] = {0,};
    size_t sizebuf = 1024;
    long result;

    grib_trie* list = load_list(h->context, g, err);

    if ((*err = grib_get_string_internal(h, e->name, mybuf, &sizebuf)) != GRIB_SUCCESS)
        return NULL;

    if (grib_trie_get(list, mybuf))
        result = 1;
    else
        result = 0;

    snprintf(buf, 32, "%ld", result);
    *size = strlen(buf);
    return buf;
}

static void print(grib_context* c, grib_expression* g, grib_handle* f, FILE* out)
{
    const grib_expression_is_in_list* e = (grib_expression_is_in_list*)g;
    fprintf(out, "access('%s", e->name);
    if (f) {
        long s = 0;
        grib_get_long(f, e->name, &s);
        fprintf(out, "=%ld", s);
    }
    fprintf(out, "')");
}

static void destroy(grib_context* c, grib_expression* g)
{
}

static void add_dependency(grib_expression* g, grib_accessor* observer)
{
    const grib_expression_is_in_list* e = (grib_expression_is_in_list*)g;
    grib_accessor* observed = grib_find_accessor(grib_handle_of_accessor(observer), e->name);

    if (!observed) {
        /* grib_context_log(observer->context, GRIB_LOG_ERROR, */
        /* "Error in accessor_add_dependency: cannot find [%s]", e->name); */
        /* Assert(observed); */
        return;
    }

    grib_dependency_add(observer, observed);
}

grib_expression* new_is_in_list_expression(grib_context* c, const char* name, const char* list)
{
    grib_expression_is_in_list* e = (grib_expression_is_in_list*)grib_context_malloc_clear_persistent(c, sizeof(grib_expression_is_in_list));
    e->base.cclass                = grib_expression_class_is_in_list;
    e->name                       = grib_context_strdup_persistent(c, name);
    e->list                       = grib_context_strdup_persistent(c, list);
    return (grib_expression*)e;
}

static int native_type(grib_expression* g, grib_handle* h)
{
    grib_expression_is_in_list* e = (grib_expression_is_in_list*)g;
    int type = 0;
    int err;
    if ((err = grib_get_native_type(h, e->name, &type)) != GRIB_SUCCESS)
        grib_context_log(h->context, GRIB_LOG_ERROR,
                         "Error in native_type %s : %s", e->name, grib_get_error_message(err));
    return type;
}
