#ifndef CMD_TARGET_H
#define CMD_TARGET_H

class c_cmd_target;

#define MSG_TYPE_INVALID	0xFFFF
#define MSG_TYPE_WND		0x0001
#define MSG_TYPE_USR		0x0002
#define USR_MSG_MAX			32

typedef void (c_cmd_target::*MsgFuncVV)();

enum MSG_CALLBACK_TYPE
{
	MSG_CALLBACK_NULL = 0,
	MSG_CALLBACK_VV,
	MSG_CALLBACK_IWL,
	MSG_CALLBACK_IWV,
	MSG_CALLBACK_VWV,
	MSG_CALLBACK_VVL,
	MSG_CALLBACK_VWL,
	MSG_CALLBACK_IVV
};

typedef union
{
	void (c_cmd_target::*func)();
	void (c_cmd_target::*func_vwv)(unsigned int w_param);
	int (c_cmd_target::*func_iwl)(unsigned int w_param, long l_param);
	int (c_cmd_target::*func_iwv)(unsigned int w_param);
	void (c_cmd_target::*func_vvl)(long l_param);
	void (c_cmd_target::*func_vwl)(unsigned int w_param, long l_param);
	int (c_cmd_target::*func_ivv)();
}MSGFUNCS;

struct GL_MSG_ENTRY
{
	unsigned int		msgType;
	unsigned int		msgId;
	c_cmd_target*		pObject;
	MSG_CALLBACK_TYPE	callbackType;
	MsgFuncVV			func;
};

#define ON_GL_USER_MSG(msgId, func)                    \
{MSG_TYPE_USR, msgId, 0, MSG_CALLBACK_VWL, (MsgFuncVV)(static_cast<void (c_cmd_target::*)(unsigned int, unsigned int)>(&func))},

#define GL_DECLARE_MESSAGE_MAP()						\
protected:												\
virtual const GL_MSG_ENTRY* GetMSgEntries() const; 	\
private:                                                \
static const GL_MSG_ENTRY mMsgEntries[];

#define GL_BEGIN_MESSAGE_MAP(theClass)					\
const GL_MSG_ENTRY* theClass::GetMSgEntries() const	\
{														\
	return theClass::mMsgEntries;						\
}														\
const GL_MSG_ENTRY theClass::mMsgEntries[] =     		\
{

#define GL_END_MESSAGE_MAP()                           \
{MSG_TYPE_INVALID, 0, (c_cmd_target*)0, MSG_CALLBACK_NULL, (MsgFuncVV)0}};

class c_cmd_target
{
public:
	c_cmd_target();
	virtual ~c_cmd_target();
	static int handle_usr_msg(unsigned int msgId, unsigned int wParam, unsigned int lParam);
protected:
	void load_cmd_msg();
	const GL_MSG_ENTRY* FindMsgEntry(const GL_MSG_ENTRY *pEntry, 
		unsigned int msgType, unsigned short msgId, unsigned short ctrlId);
private:
	static GL_MSG_ENTRY ms_usr_map_entries[USR_MSG_MAX];
	static unsigned short ms_user_map_size;
	GL_DECLARE_MESSAGE_MAP()
};

#endif