/************************************************************************
 *   Unreal Internet Relay Chat Daemon, include/modules.h
 *   (C) Carsten V. Munk 2000 <stskeeps@tspre.org>
 *
 *   This program 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 1, or (at your option)
 *   any later version.
 *
 *   This program 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 this program; if not, write to the Free Software
 *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *   $Id$
 */

#define MOD_VERSION	"3.2-b5-1"
#define MOD_WE_SUPPORT  "3.2-b5*"
#define MAXHOOKTYPES	20

#if defined(_WIN32)
#define DLLFUNC	_declspec(dllexport)
#define irc_dlopen(x,y) LoadLibrary(x)
#define irc_dlclose FreeLibrary
#define irc_dlsym(x,y,z) z = (void *)GetProcAddress(x,y)
#undef irc_dlerror
#elif defined(HPUX)
#define irc_dlopen(x,y) shl_load(x,y,0L)
#define irc_dlsym(x,y,z) shl_findsym(x,y,z)
#define irc_dlclose shl_unload
#define irc_dlerror() strerror(errno)
#else
#define irc_dlopen dlopen
#define irc_dlclose dlclose
#define irc_dlsym(x,y,z) z = dlsym(x,y)
#define irc_dlerror dlerror
#define DLLFUNC 
#endif

typedef void			(*vFP)();	/* Void function pointer */
typedef int			(*iFP)();	/* Integer function pointer */
typedef char			(*cFP)();	/* char * function pointer */

/*
 * For resolving symbols 
 * Look further down for definition of the structure
 */
typedef struct _mod_symboltable Mod_SymbolDepTable;

/*
 * Module header that every module must include, with the name of
 * mod_header
*/

typedef struct _ModuleHeader {
	char	*name;
	char	*version;
	char	*description;
	char	*modversion;
	Mod_SymbolDepTable *symdep;
} ModuleHeader;

/*
 * One piece of Borg ass..
*/
typedef struct _Module Module;

typedef struct _ModuleChild
{
	struct _ModuleChild *prev, *next; 
	Module *child; /* Aww. aint it cute? */
} ModuleChild;

/*
 * What we use to keep track internally of the modules
*/

struct _Module
{
	struct _Module *prev, *next;
	ModuleHeader    *header; /* The module's header */
#ifdef _WIN32
	HMODULE dll;		/* Return value of LoadLibrary */
#elif defined(HPUX)
	shl_t	dll;
#else
	void	*dll;		/* Return value of dlopen */
#endif	
	unsigned char flags;    /* 8-bits for flags .. */
	ModuleChild *children;
};


/*
 * Symbol table
*/

struct _mod_symboltable
{
#ifndef STATIC_LINKING
	char	*symbol;
#else
	void	*realfunc;
#endif
	vFP 	*pointer;
#ifndef STATIC_LINKING
	char	*module;
#endif
};

#ifndef STATIC_LINKING
#define MOD_Dep(name, container,module) {#name, (vFP *) &container, module}
#else
#define MOD_Dep(name, container,module) {(void *)&name, (vFP *) &container}
#endif


extern Hook		*Hooks[MAXHOOKTYPES];
extern Hook		*global_i;

void    Module_Init(void);
char    *Module_Load(char *path, int load);
int     Module_Unload(char *name, int unload);
vFP     Module_Sym(char *name);
vFP     Module_SymX(char *name, Module **mptr);
int	Module_free(Module *mod);

#define add_Hook(hooktype, func) HookAddEx(hooktype, func, NULL)
#define del_Hook(hooktype, func) HookDelEx(hooktype, func, NULL)
#define HookAdd(hooktype, func) HookAddEx(hooktype, func, NULL)
#define HookDel(hooktype, func) HookDelEx(hooktype, func, NULL)

#define add_HookX(hooktype, func1, func2) HookAddEx(hooktype, func1, func2)
#define del_HookX(hooktype, func1, func2) HookDelEx(hooktype, func1, func2)

void	HookAddEx(int hooktype, int (*intfunc)(), void (*voidfunc)());
void	HookDelEx(int hooktype, int (*intfunc)(), void (*voidfunc)());

#define RunHook0(hooktype) for (global_i = Hooks[hooktype]; global_i; global_i = global_i->next)(*(global_i->func.intfunc))()
#define RunHook(hooktype,x) for (global_i = Hooks[hooktype]; global_i; global_i = global_i->next) (*(global_i->func.intfunc))(x)
#define RunHookReturn(hooktype,x,ret) for (global_i = Hooks[hooktype]; global_i; global_i = global_i->next) if((*(global_i->func.intfunc))(x) ret) return
#define RunHook2(hooktype,x,y) for (global_i = Hooks[hooktype]; global_i; global_i = global_i->next) (*(global_i->func.intfunc))(x,y)


/* Hook types */
#define HOOKTYPE_LOCAL_QUIT	1
#define HOOKTYPE_LOCAL_NICKCHANGE 2
#define HOOKTYPE_LOCAL_CONNECT 3
#define HOOKTYPE_SCAN_HOST 4	/* Taken care of in scan.c */
#define HOOKTYPE_SCAN_INFO 5    /* Taken care of in scan.c */
#define HOOKTYPE_CONFIG_UNKNOWN 6
#define HOOKTYPE_REHASH 7
#define HOOKTYPE_PRE_LOCAL_CONNECT 8
#define HOOKTYPE_HTTPD_URL 9
#define HOOKTYPE_GUEST 10
#define HOOKTYPE_SERVER_CONNECT 11
#define HOOKTYPE_SERVER_QUIT 12

/* Module flags */
#define MODFLAG_NONE	0x0000
#define MODFLAG_LOADED	0x0001 /* (mod_load has been called and suceeded) */

/* Module function return values */
#define MOD_SUCCESS 0
#define MOD_FAILED -1
#define MOD_DELAY 2