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/* This file is part of Ping903
   Copyright (C) 2020 Sergey Poznyakoff
  
   Ping903 is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3, or (at your option)
   any later version.
  
   Ping903 is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
  
   You should have received a copy of the GNU General Public License
   along with Ping903.  If not, see <http://www.gnu.org/licenses/>.
*/

#include <stdlib.h>

enum json_value_type {
	json_null,
	json_bool,
	json_number,
	json_string,
	json_array,
	json_object
};

struct json_value;

struct json_array {
	size_t oc;
	struct json_value **ov;
	size_t on;
};

struct json_object {
	struct json_pair *head;
	struct json_pair *tail;
	size_t count;
};

struct json_value {
	enum json_value_type type;
	union {
		int b;                  /* json_bool */
		double n;               /* json_number */
		char *s;                /* json_string */
		struct json_array *a;   /* json_array */
		struct json_object *o;  /* json_object */
	} v;
};

struct json_pair {
	struct json_pair *next;
	char *k;
	struct json_value *v;
};

struct json_format
{
	size_t indent;
	int precision;
	void (*write) (void *, char const *, size_t);
	void *data;
};

int json_value_format(struct json_value *obj, struct json_format *fmt,
		       size_t level);
void json_value_free(struct json_value *);
int json_value_copy(struct json_value *val, struct json_value **new_val);

char const *json_strerror(int ec);

void *json_2nrealloc(void *p, size_t *pn, size_t s);

struct json_value *json_new_null(void);
struct json_value *json_new_bool(int b);
struct json_value *json_new_number(double n);
struct json_value *json_new_string(char const *str);

struct json_value *json_new_object(void);
int json_object_set(struct json_value *obj, char const *name,
		    struct json_value *val);
int json_object_get(struct json_value *obj, char const *name,
		    struct json_value **retval);

struct json_value *json_new_array(void);
static inline size_t json_array_length(struct json_value *j) {
	return j->v.a->oc;
}
int json_array_insert(struct json_value *j, size_t idx, struct json_value *v);
int json_array_append(struct json_value *j, struct json_value *v);
int json_array_set(struct json_value *j, size_t idx, struct json_value *v);
int json_array_get(struct json_value *j, size_t idx,
		   struct json_value **retval);


enum {
	JSON_E_NOERR,
	JSON_E_NOMEM,
	JSON_E_BADTOK,
	JSON_E_BADDELIM,
	JSON_E_BADSTRING
};

int json_parse_string(char const *input, struct json_value **retval,
		      char **endp);

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