#ifndef KEYWORD_H
#define KEYWORD_H
#include <stddef.h>
#include <time.h>

typedef enum keyword_type keyword_type;
typedef struct delimiter delimiter;
typedef struct keyword keyword;
typedef union keyword_val keyword_val;
typedef int (set_keyword_cb)(void *ctx, void *ret, const keyword *key, keyword_val val);
typedef int (get_keyword_cb)(void *ctx, void *data, const keyword *key, keyword_val *val);
typedef int (parse_callback)(void **ret, void *ctx, char *buf);

enum keyword_type {
	TYPE_NONE,
	TYPE_INT,
	TYPE_STRING,
	TYPE_FLOAT,
	TYPE_BOOL,
	TYPE_TIME,
	TYPE_COUNT,
};

struct delimiter {
	char *delm;		/* Delimiter. */
	int lead_space;		/* Leading whitespace. */
	int trail_space;	/* Trailing whitespace. */
};

struct keyword {
	const char *key;		/* Keyword. */
	const char *desc;		/* Description of the keyword. */
	const char *time_fmt;		/* Format string used to parse a timestamp (if needed). */
	keyword_type type;		/* Datatype of the keyword. */
	size_t *offsets;		/* Offset(s) of member(s) in a struct (if needed). */
	set_keyword_cb *set_callback;	/* Callback to keyword specific setter function (if needed). */
	get_keyword_cb *get_callback;	/* Callback to keyword specific getter function (if needed). */
};

union keyword_val {
	int i;		/* Integer. */
	time_t t;	/* Time. */
	char *str;	/* String. */
	float f;	/* Float. */
};

extern void *get_keyword_offset_ptr(const keyword *key, void *ptr);
extern keyword_val get_keyword_value(const keyword *key, char *value, int *error);
extern keyword_val get_keyword(const keyword *key, void *data, void *ctx, int *error);
extern int set_keyword(const keyword *key, keyword_val val, void *ret, void *ctx);
extern keyword_val parse_keyword(const keyword *key, char *key_str, char *value, int *error);
extern int parse_keywords(const keyword **keys, char *key, char *value, void *ret, void *ctx);
extern int parse_key_value_file(void *ret, void *ctx, const keyword **keywords, char *buf, const char *delm, parse_callback *parse_cb);
extern char *create_key_value_str(const keyword *key, keyword_val val, const delimiter *start_delm, const delimiter *end_delm);
extern char *create_key_value_file(void *data, void *ctx, const keyword **keywords, const delimiter *start_delm, const delimiter *end_delm);
#endif