#ifndef MOO_H
#define MOO_H

#include <stdio.h>

#ifndef TRUE
#define TRUE 1
#endif

#ifndef FALSE
#define FALSE 0
#endif

typedef void	*(*clone_f)(void *obj, int clone_state);
typedef void	(*dispose_f)(void *obj);

typedef struct
{
	clone_f		Clone;
	dispose_f	Dispose;
	size_t		Size;
	uint		Flags;
	int			RefCount;
} obj_t;

#define OBJF_ALLOCATED	1
#define OBJF_DISPOSED	2

obj_t	*objClone(obj_t *this, int clone_state);
void	objDispose(obj_t *this);
int		objInit(obj_t *this);
obj_t	*objNew(size_t size);

#define Dispose(obj)	(((obj_t *)(obj))->Dispose(obj))

/* If clone_state = TRUE then the entire state of the object is cloned so
** the new object is identical to the original. Otherwise only the initial
** state is cloned. */

#define Clone(obj, clone_state)	(((obj_t *)(obj))->Clone(obj, clone_state))

/* If a class does Dispose() on objects that weren't created by the class
** itself then IncRefCount() must be used on such object. If this is not done
** then an object will be free while it still may be in use somewhere else. */

#define IncRefCount(obj)	(++(((obj_t *)(obj))->RefCount))

/* All classes should do a if(DecRefCount(this) <= 0) in the dispose function to make
** sure that the object is only freed when it's no longer in use. */

#define DecRefCount(obj)	(--(((obj_t *)(obj))->RefCount))

typedef struct
{
	obj_t	Obj;
	char	*Buf;
	uint	Length;
	uint	MaxLength;
	uint	MinLength;
} string_t;

#define STRE_OK		0
#define STRE_NOMEM	1

/* string API: */

string_t	*stringNew(char *str, uint min_len);
char		*stringGet(string_t *string);
int			stringAdd(string_t *string, uint tail, char *strs,...);
void		stringClear(string_t *string);
int			stringSet(string_t *string, char *str);
#define		stringAddHead(string,str)	stringAdd(string,0,str,(char *)NULL)
#define		stringAddTail(string,str)	stringAdd(string,1,str,(char *)NULL)

/* DEBUG_OBJVALID should be used at the top of every method except New, Init and Dispose.
** DEBUG_DISPOSEOBJVALID should be used in Dispose because it's normal that the RefCount
** is < 0 in Dispose. */

#ifdef DEBUG
#define DEBUG_OBJVALID(funcname,obj)		if(!(obj) || (((obj_t *)(obj))->RefCount < 0)) \
{ \
	printf("DEBUG_ERROR: Invalid object pointer in "funcname" (\""__FILE__"\" line %d).\n", __LINE__); \
	if(obj) puts("RefCount < 0."); \
	else puts("NULL pointer."); \
	puts("Press [Return] to continue."); \
	getchar(); \
}
#define DEBUG_DISPOSEOBJVALID(class,obj)	if(!(obj)) \
{ \
	printf("DEBUG_ERROR: Invalid object pointer in "class"Dispose (\""__FILE__"\" line %d).\nNULL pointer.\nPress [Return] to continue", __LINE__); \
	getchar(); \
}
#else
#define DEBUG_OBJVALID(funcname,obj)
#define DEBUG_DISPOSEOBJVALID(class,obj)
#endif

#endif