/**

 * vim: set ts=4 :

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

 * SourceMod

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

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

 *

 * This program is free software; you can redistribute it and/or modify it under

 * the terms of the GNU General Public License, version 3.0, as published by the

 * Free Software Foundation.

 * 

 * 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, see <http://www.gnu.org/licenses/>.

 *

 * As a special exception, AlliedModders LLC gives you permission to link the

 * code of this program (as well as its derivative works) to "Half-Life 2," the

 * "Source Engine," the "SourcePawn JIT," and any Game MODs that run on software

 * by the Valve Corporation.  You must obey the GNU General Public License in

 * all respects for all other code used.  Additionally, AlliedModders LLC grants

 * this exception to all derivative works.  AlliedModders LLC defines further

 * exceptions, found in LICENSE.txt (as of this writing, version JULY-31-2007),

 * or <http://www.sourcemod.net/license.php>.

 *

 * Version: $Id$

 */

#ifndef _INCLUDE_SOURCEMOD_EXTENSION_SYSTEM_H_

#define _INCLUDE_SOURCEMOD_EXTENSION_SYSTEM_H_

#include <IExtensionSys.h>

#include <ILibrarySys.h>

#include <sh_list.h>

#include <sh_string.h>

#include <sm_trie_tpl.h>

#include "sm_globals.h"

#include "ShareSys.h"

#include <ISmmAPI.h>

#include <IPluginSys.h>

#include <IRootConsoleMenu.h>

#include "PluginSys.h"

using namespace SourceMod;

using namespace SourceHook;

class CExtension;

struct sm_extnative_t

{

	CExtension *owner;

	const sp_nativeinfo_t *info;

};

/* Replacement native */

struct sm_repnative_t

{

	CExtension *owner;

	sp_nativeinfo_t info;

	SPVM_NATIVE_FUNC original;

};

class CExtension : public IExtension

{

	friend class CExtensionManager;

public:

	virtual ~CExtension();

public: //IExtension

	IExtensionInterface *GetAPI();

	const char *GetFilename();

	IdentityToken_t *GetIdentity();

	ITERATOR *FindFirstDependency(IExtension **pOwner, SMInterface **pInterface);

	bool FindNextDependency(ITERATOR *iter, IExtension **pOwner, SMInterface **pInterface);

	void FreeDependencyIterator(ITERATOR *iter);

	bool IsRunning(char *error, size_t maxlength);

public:

	void SetError(const char *error);

	void AddDependency(IfaceInfo *pInfo);

	void AddChildDependent(CExtension *pOther, SMInterface *iface);

	void AddInterface(SMInterface *pInterface);

	void AddPlugin(IPlugin *pPlugin);

	void RemovePlugin(IPlugin *pPlugin);

	void MarkAllLoaded();

	void AddLibrary(const char *library);

public:

	virtual bool Load(char *error, size_t maxlength);

	virtual bool IsLoaded() =0;

	virtual void Unload() =0;

protected:

	void Initialize(const char *filename, const char *path);

	bool PerformAPICheck(char *error, size_t maxlength);

	void CreateIdentity();

	void DestroyIdentity();

protected:

	IdentityToken_t *m_pIdentToken;

	IExtensionInterface *m_pAPI;

	String m_File;

	String m_Path;

	String m_Error;

	List<IfaceInfo> m_Deps;			/** Dependencies */

	List<IfaceInfo> m_ChildDeps;	/** Children who might depend on us */

	List<SMInterface *> m_Interfaces;

	List<IPlugin *> m_Plugins;

	List<const sp_nativeinfo_t *> m_Natives;

	List<WeakNative> m_WeakNatives;

	List<WeakNative> m_ReplacedNatives;

	List<String> m_Libraries;

	unsigned int unload_code;

	bool m_bFullyLoaded;

};

class CLocalExtension : public CExtension

{

public:

	CLocalExtension(const char *filename);

public:

	bool Load(char *error, size_t maxlength);

	bool IsLoaded();

	void Unload();

	bool IsExternal();

private:

	PluginId m_PlId;

	ILibrary *m_pLib;

};

class CRemoteExtension : public CExtension

{

public:

	CRemoteExtension(IExtensionInterface *pAPI, const char *filename, const char *path);

public:

	bool Load(char *error, size_t maxlength);

	bool IsLoaded();

	void Unload();

	bool IsExternal();

};

class CExtensionManager : 

	public IExtensionManager,

	public SMGlobalClass,

	public IPluginsListener,

	public IRootConsoleCommand

{

public:

	CExtensionManager();

	~CExtensionManager();

public: //SMGlobalClass

	void OnSourceModAllInitialized();

	void OnSourceModShutdown();

public: //IExtensionManager

	IExtension *LoadExtension(const char *path, 

		char *error,

		size_t maxlength);

	bool UnloadExtension(IExtension *pExt);

	IExtension *FindExtensionByFile(const char *file);

	IExtension *FindExtensionByName(const char *ext);

	IExtension *LoadExternal(IExtensionInterface *pInterface,

		const char *filepath,

		const char *filename,

		char *error,

		size_t maxlength);

public: //IPluginsListener

	void OnPluginDestroyed(IPlugin *plugin);

public: //IRootConsoleCommand

	void OnRootConsoleCommand(const char *cmdname, const CCommand &command);

public:

	IExtension *LoadAutoExtension(const char *path);

	void BindDependency(IExtension *pOwner, IfaceInfo *pInfo);

	void AddInterface(IExtension *pOwner, SMInterface *pInterface);

	void BindChildPlugin(IExtension *pParent, IPlugin *pPlugin);

	void AddNatives(IExtension *pOwner, const sp_nativeinfo_t *natives);

	void BindAllNativesToPlugin(IPlugin *pPlugin);

	void MarkAllLoaded();

	void AddDependency(IExtension *pSource, const char *file, bool required, bool autoload);

	void TryAutoload();

	void AddLibrary(IExtension *pSource, const char *library);

	bool LibraryExists(const char *library);

	void OverrideNatives(IExtension *myself, const sp_nativeinfo_t *natives);

public:

	CExtension *GetExtensionFromIdent(IdentityToken_t *ptr);

	void Shutdown();

private:

	CExtension *FindByOrder(unsigned int num);

private:

	List<CExtension *> m_Libs;

	List<sm_repnative_t> m_RepNativeList;

	KTrie<sm_repnative_t> m_RepNatives;

	KTrie<sm_extnative_t> m_ExtNatives;

};

extern CExtensionManager g_Extensions;

#endif //_INCLUDE_SOURCEMOD_EXTENSION_SYSTEM_H_