/**

 * ===============================================================

 * SourceMod (C)2004-2007 AlliedModders LLC.  All rights reserved.

 * ===============================================================

 *

 * This file is not open source and may not be copied without explicit

 * written permission of AlliedModders LLC.  This file may not be redistributed 

 * in whole or significant part.

 * For information, see LICENSE.txt or http://www.sourcemod.net/license.php

 *

 * Version: $Id$

 */

#ifndef _INCLUDE_SOURCEMOD_FORWARDSYSTEM_H_

#define _INCLUDE_SOURCEMOD_FORWARDSYSTEM_H_

#include <IForwardSys.h>

#include <IPluginSys.h>

#include "sm_globals.h"

#include <sh_list.h>

#include <sh_stack.h>

#include "sourcemod.h"

using namespace SourceHook;

typedef List<IPluginFunction *>::iterator FuncIter;

//:TODO: a global name max define for sourcepawn, should mirror compiler's sNAMEMAX

#define FORWARDS_NAME_MAX		64

struct ByrefInfo

{

	unsigned int cells;

	cell_t *orig_addr;

	int flags;

	int sz_flags;

};

struct FwdParamInfo

{

	cell_t val;

	ByrefInfo byref;

	ParamType pushedas;

};

class CForward : public IChangeableForward

{

public: //ICallable

	virtual int PushCell(cell_t cell);

	virtual int PushCellByRef(cell_t *cell, int flags);

	virtual int PushFloat(float number);

	virtual int PushFloatByRef(float *number, int flags);

	virtual int PushArray(cell_t *inarray, unsigned int cells, cell_t **phys_addr, int flags);

	virtual int PushString(const char *string);

	virtual int PushStringEx(char *buffer, size_t length, int sz_flags, int cp_flags);

	virtual void Cancel();

public: //IForward

	virtual const char *GetForwardName() const;

	virtual unsigned int GetFunctionCount() const;

	virtual ExecType GetExecType() const;

	virtual int Execute(cell_t *result, IForwardFilter *filter);

public: //IChangeableForward

	virtual bool RemoveFunction(IPluginFunction *func);

	virtual unsigned int RemoveFunctionsOfPlugin(IPlugin *plugin);

	virtual bool AddFunction(IPluginFunction *func);

	virtual bool AddFunction(IPluginContext *ctx, funcid_t index);

public:

	static CForward *CreateForward(const char *name, 

								   ExecType et, 

								   unsigned int num_params, 

								   ParamType *types, 

								   va_list ap);

	void PushPausedFunctions(IPlugin *plugin);

	void PopPausedFunctions(IPlugin *plugin);

private:

	void _Int_PushArray(cell_t *inarray, unsigned int cells, int flags);

	void _Int_PushString(cell_t *inarray, unsigned int cells, int sz_flags, int cp_flags);

	inline int SetError(int err)

	{

		m_errstate = err;

		return err;

	}

protected:

	/* :TODO: I want a caching list type here.

	 * Destroying these things and using new/delete for their members feels bad.

	 */

	List<IPluginFunction *> m_functions;

	List<IPluginFunction *> m_paused;

	/* Type and name information */

	FwdParamInfo m_params[SP_MAX_EXEC_PARAMS];

	ParamType m_types[SP_MAX_EXEC_PARAMS];

	char m_name[FORWARDS_NAME_MAX+1];

	unsigned int m_numparams;

	unsigned int m_varargs;

	ExecType m_ExecType;

	/* State information */

	unsigned int m_curparam;

	int m_errstate;

};

class CForwardManager : 

	public IForwardManager,

	public IPluginsListener,

	public SMGlobalClass

{

	friend class CForward;

public: //IForwardManager

	IForward *CreateForward(const char *name, 

		ExecType et, 

		unsigned int num_params, 

		ParamType *types, 

		...);

	IChangeableForward *CreateForwardEx(const char *name, 

		ExecType et, 

		int num_params, 

		ParamType *types, 

		...);

	IForward *FindForward(const char *name, IChangeableForward **ifchng);

	void ReleaseForward(IForward *forward);

public: //IPluginsListener

	void OnPluginLoaded(IPlugin *plugin);

	void OnPluginUnloaded(IPlugin *plugin);

	void OnPluginPauseChange(IPlugin *plugin, bool paused);

public: //SMGlobalClass

	void OnSourceModAllInitialized();

	void OnSourceModShutdown();

protected:

	CForward *ForwardMake();

	void ForwardFree(CForward *fwd);

private:

	CStack<CForward *> m_FreeForwards;

	List<CForward *> m_managed;

	List<CForward *> m_unmanaged;

};

extern CForwardManager g_Forwards;

#endif //_INCLUDE_SOURCEMOD_FORWARDSYSTEM_H_