/**

  * vim: set ts=4 :

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

  * SourceMod

  * Copyright (C) 2004-2008 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_PLUGINSYSTEM_H_

 #define _INCLUDE_SOURCEMOD_PLUGINSYSTEM_H_

 #include <time.h>

 #include <errno.h>

 #include <sys/stat.h>

 #include <IPluginSys.h>

 #include <IHandleSys.h>

 #include <IForwardSys.h>

 #include <sh_list.h>

 #include <sh_stack.h>

 #include <sh_vector.h>

 #include <sh_string.h>

 #include "sm_globals.h"

 #include "PluginInfoDatabase.h"

 #include "sm_trie.h"

 #include "sourcemod.h"

 #include <IRootConsoleMenu.h>

 #if defined ORANGEBOX_BUILD

 #include "convar_sm_ob.h"

 #else

 #include "convar_sm.h"

 #endif

 #include "ITranslator.h"

 #include "NativeOwner.h"

 #include "ShareSys.h"

 using namespace SourceHook;

 /**

  * NOTES:

  *

  * UPDATE 2008-03-11: These comments are horribly out of date.  They paint a good overall 

  * picture of how PluginSys works, but things like dependencies and fake natives have 

  * complicated things quite a bit.

  *

  *  Currently this system needs a lot of work but it's good skeletally.  Plugin creation 

  * is done without actually compiling anything.  This is done by Load functions in the 

  * manager.  This will need a rewrite when we add context switching.

  *

  *  The plugin object itself has a few things to note.  The most important is that it stores

  * a table of function objects.  The manager marshals allocation and freeing of these objects.

  * The plugin object can be in erroneous states, they are:

  *   Plugin_Error   --> Some error occurred any time during or after compilation.

  *						This error can be cleared since the plugin itself is valid.

  *						However, the state itself being set prevents any runtime action.

  *   Plugin_BadLoad	--> The plugin failed to load entirely and nothing can be done to save it.

  *

  *  If a plugin fails to load externally, it is never added to the internal tracker.  However, 

  * plugins that failed to load from the internal loading mechanism are always tracked.  This 

  * allows users to see which automatically loaded plugins failed, and makes the interface a bit

  * more flexible.

  *

  *  Once a plugin is compiled, it sets its own state to Plugin_Created.  This state is still invalid

  * for execution.  SourceMod is a two pass system, and even though the second pass is not implemented

  * yet, it is structured so Plugin_Created must be switched to Plugin_Running in the second pass.  When

  * implemented, a Created plugin will be switched to Error in the second pass if it not loadable.

  *

  *  The two pass loading mechanism is described below.  Modules/natives are not implemented yet.

  * PASS ONE: All loadable plugins are found and have the following steps performed:

  *			 1.  Loading and compilation is attempted.

  *			 2.  If successful, all natives from Core are added.

  *			 3.  OnPluginLoad() is called.

  *			 4.  If failed, any user natives are scrapped and the process halts here.

  *			 5.  If successful, the plugin is ready for Pass 2.

  * INTERMEDIATE:

  *			 1.  All forced modules are loaded.

  * PASS TWO: All loaded plugins are found and have these steps performed:

  *			 1. Any modules referenced in the plugin that are not already loaded, are loaded.

  *			 2. If any module fails to load and the plugin requires it, load fails and jump to step 6.

  *			 3. If any natives are unresolved, check if they are found in the user-natives pool.

  *			 4. If yes, load succeeds.  If not, natives are passed through a native acceptance filter.

  *			 5. If the filter fails, the plugin is marked as failed.

  *			 6. If the plugin has failed to load at this point, any dynamic natives it has added are scrapped.

  *			    Furthermore, any plugin that referenced these natives must now have pass 2 re-ran.

  * PASS THREE (not a real pass):

  *			 7. Once all plugins are deemed to be loaded, OnPluginStart() is called

  */

 enum LoadRes

 {

 	LoadRes_Successful,

 	LoadRes_AlreadyLoaded,

 	LoadRes_Failure,

 	LoadRes_NeverLoad

 };

 struct AutoConfig

 {

 	String autocfg;

 	String folder;

 	bool create;

 };

 class CPlugin;

 class CPlugin : 

 	public IPlugin,

 	public CNativeOwner

 {

 	friend class CPluginManager;

 	friend class CFunction;

 public:

 	CPlugin(const char *file);

 	~CPlugin();

 public:

 	PluginType GetType();

 	SourcePawn::IPluginContext *GetBaseContext();

 	sp_context_t *GetContext();

 	void *GetPluginStructure();

 	const char *GetFilename();

 	bool IsDebugging();

 	PluginStatus GetStatus();

 	const sm_plugininfo_t *GetPublicInfo();

 	bool SetPauseState(bool paused);

 	unsigned int GetSerial();

 	IdentityToken_t *GetIdentity();

 	unsigned int CalcMemUsage();

 	bool SetProperty(const char *prop, void *ptr);

 	bool GetProperty(const char *prop, void **ptr, bool remove=false);

 	void DropEverything();

 	SourcePawn::IPluginRuntime *GetRuntime();

 public:

 	/**

 	 * Creates a plugin object with default values.

 	 *   If an error buffer is specified, and an error occurs, the error will be copied to the buffer

 	 * and NULL will be returned.

 	 *   If an error buffer is not specified, the error will be copied to an internal buffer and 

 	 * a valid (but error-stated) CPlugin will be returned.

 	 */

 	static CPlugin *CreatePlugin(const char *file, char *error, size_t maxlength);

 public:

 	/**

 	 * Sets an error state on the plugin

 	 */

 	void SetErrorState(PluginStatus status, const char *error_fmt, ...);

 	/**

 	 * Initializes the plugin's identity information

 	 */

 	void InitIdentity();

 	/**

 	 * Calls the OnPluginLoad function, and sets any failed states if necessary.

 	 * NOTE: Valid pre-states are: Plugin_Created

 	 * NOTE: If validated, plugin state is changed to Plugin_Loaded

 	 *

 	 * If the error buffer is NULL, the error message is cached locally.

 	 */

 	bool Call_AskPluginLoad(char *error, size_t maxlength);

 	/**

 	 * Calls the OnPluginStart function.

 	 * NOTE: Valid pre-states are: Plugin_Created

 	 * NOTE: Post-state will be Plugin_Running

 	 */

 	void Call_OnPluginStart();

 	/**

 	 * Calls the OnPluginEnd function.

 	 */

 	void Call_OnPluginEnd();

 	/**

 	 * Calls the OnAllPluginsLoaded function.

 	 */

 	void Call_OnAllPluginsLoaded();

 	/**

 	 * Returns true if a plugin is usable.

 	 */

 	bool IsRunnable();

 	/**

 	 * Get languages info.

 	 */

 	IPhraseCollection *GetPhrases();

 public:

 	/**

 	 * Returns the modification time during last plugin load.

 	 */

 	time_t GetTimeStamp();

 	/**

 	 * Returns the current modification time of the plugin file.

 	 */

 	time_t GetFileTimeStamp();

 	/** 

 	 * Returns true if the plugin was running, but is now invalid.

 	 */

 	bool WasRunning();

 	Handle_t GetMyHandle();

 	bool AddFakeNative(IPluginFunction *pFunc, const char *name, SPVM_FAKENATIVE_FUNC func);

 	void AddConfig(bool autoCreate, const char *cfg, const char *folder);

 	unsigned int GetConfigCount();

 	AutoConfig *GetConfig(unsigned int i);

 	inline void AddLibrary(const char *name)

 	{

 		m_Libraries.push_back(name);

 	}

 	void LibraryActions(bool dropping);

 protected:

 	void UpdateInfo();

 	void SetTimeStamp(time_t t);

 	void DependencyDropped(CPlugin *pOwner);

 private:

 	PluginType m_type;

 	char m_filename[PLATFORM_MAX_PATH];

 	PluginStatus m_status;

 	unsigned int m_serial;

 	sm_plugininfo_t m_info;

 	char m_errormsg[256];

 	time_t m_LastAccess;

 	IdentityToken_t *m_ident;

 	Handle_t m_handle;

 	bool m_WasRunning;

 	IPhraseCollection *m_pPhrases;

 	List<String> m_RequiredLibs;

 	List<String> m_Libraries;

 	Trie *m_pProps;

 	bool m_FakeNativesMissing;

 	bool m_LibraryMissing;

 	CVector<AutoConfig *> m_configs;

 	bool m_bGotAllLoaded;

 	int m_FileVersion;

 	char m_DateTime[256];

 	IPluginRuntime *m_pRuntime;

 	IPluginContext *m_pContext;

 };

 class CPluginManager : 

 	public IPluginManager,

 	public SMGlobalClass,

 	public IHandleTypeDispatch,

 	public IRootConsoleCommand

 {

 	friend class CPlugin;

 public:

 	CPluginManager();

 	~CPluginManager();

 public:

 	/* Implements iterator class */

 	class CPluginIterator : public IPluginIterator

 	{

 	public:

 		CPluginIterator(List<CPlugin *> *mylist);

 		virtual ~CPluginIterator();

 		virtual bool MorePlugins();

 		virtual IPlugin *GetPlugin();

 		virtual void NextPlugin();

 		void Release();

 	public:

 		void Reset();

 	private:

 		List<CPlugin *> *mylist;

 		List<CPlugin *>::iterator current;

 	};

 	friend class CPluginManager::CPluginIterator;

 public: //IPluginManager

 	IPlugin *LoadPlugin(const char *path, 

 								bool debug,

 								PluginType type,

 								char error[],

 								size_t maxlength,

 								bool *wasloaded);

 	bool UnloadPlugin(IPlugin *plugin);

 	IPlugin *FindPluginByContext(const sp_context_t *ctx);

 	unsigned int GetPluginCount();

 	IPluginIterator *GetPluginIterator();

 	void AddPluginsListener(IPluginsListener *listener);

 	void RemovePluginsListener(IPluginsListener *listener);

 public: //SMGlobalClass

 	void OnSourceModAllInitialized();

 	void OnSourceModShutdown();

 public: //IHandleTypeDispatch

 	void OnHandleDestroy(HandleType_t type, void *object);

 	bool GetHandleApproxSize(HandleType_t type, void *object, unsigned int *pSize);

 public: //IRootConsoleCommand

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

 public:

 	/**

 	 * Loads all plugins not yet loaded

 	 */

 	void LoadAll_FirstPass(const char *config, const char *basedir);

 	/**

 	 * Runs the second loading pass for all plugins

 	 */

 	void LoadAll_SecondPass();

 	/**

 	 * Tests a plugin file mask against a local folder.

 	 * The alias is searched backwards from localdir - i.e., given this input:

 	 *   csdm/ban        csdm/ban

 	 *   ban             csdm/ban

 	 *   csdm/ban        optional/csdm/ban

 	 * All of these will return true for an alias match.  

 	 * Wildcards are allowed in the filename.

 	 */

 	bool TestAliasMatch(const char *alias, const char *localdir);

 	/** 

 	 * Returns whether anything loaded will be a late load.

 	 */

 	bool IsLateLoadTime() const;

 	/**

 	 * Converts a Handle to an IPlugin if possible.

 	 */

 	IPlugin *PluginFromHandle(Handle_t handle, HandleError *err);

 	/**

 	 * Finds a plugin based on its index. (starts on index 1)

 	 */

 	CPlugin *GetPluginByOrder(int num);

 	int GetOrderOfPlugin(IPlugin *pl);

 	/** 

 	 * Internal version of FindPluginByContext()

 	 */

 	CPlugin *GetPluginByCtx(const sp_context_t *ctx);

 	/**

 	 * Gets status text for a status code 

 	 */

 	const char *GetStatusText(PluginStatus status);

 	/**

 	* Reload or update plugins on level shutdown.

 	*/

 	void ReloadOrUnloadPlugins();

 	/**

 	 * Add public functions from all running or paused

 	 * plugins to the specified forward if the names match.

 	 */

 	void AddFunctionsToForward(const char *name, IChangeableForward *pForward);

 	/**

 	 * Iterates through plugins to call OnAllPluginsLoaded.

 	 */

 	void AllPluginsLoaded();

 	CPlugin *GetPluginFromIdentity(IdentityToken_t *pToken);

 	void Shutdown();

 	void OnLibraryAction(const char *lib, bool is_a_plugin, bool drop);

 	bool LibraryExists(const char *lib);

 	bool ReloadPlugin(CPlugin *pl);

 	void UnloadAll();

 	CPlugin *FindPluginByConsoleArg(const char *arg);

 private:

 	LoadRes _LoadPlugin(CPlugin **pPlugin, const char *path, bool debug, PluginType type, char error[], size_t maxlength);

 	void LoadAutoPlugin(const char *plugin);

 	/**

 	 * Recursively loads all plugins in the given directory.

 	 */

 	void LoadPluginsFromDir(const char *basedir, const char *localdir);

 	/**

 	 * Adds a plugin object.  This is wrapped by LoadPlugin functions.

 	 */

 	void AddPlugin(CPlugin *pPlugin);

 	/**

 	 * Runs the second loading pass on a plugin.

 	 */

 	bool RunSecondPass(CPlugin *pPlugin, char *error, size_t maxlength);

 	/**

 	 * Runs an extension pass on a plugin.

 	 */

 	bool LoadOrRequireExtensions(CPlugin *pPlugin, unsigned int pass, char *error, size_t maxlength);

 	/**

 	* Manages required natives.

 	*/

 	bool FindOrRequirePluginDeps(CPlugin *pPlugin, char *error, size_t maxlength);

 	void _SetPauseState(CPlugin *pPlugin, bool pause);

 protected:

 	/**

 	 * Caching internal objects

 	 */

 	void ReleaseIterator(CPluginIterator *iter);

 public:

 	inline IdentityToken_t *GetIdentity()

 	{

 		return m_MyIdent;

 	}

 private:

 	void TryRefreshDependencies(CPlugin *pOther);

 private:

 	List<IPluginsListener *> m_listeners;

 	List<CPlugin *> m_plugins;

 	CStack<CPluginManager::CPluginIterator *> m_iters;

 	CPluginInfoDatabase m_PluginInfo;

 	Trie *m_LoadLookup;

 	bool m_AllPluginsLoaded;

 	IdentityToken_t *m_MyIdent;

 	/* Dynamic native stuff */

 	List<FakeNative *> m_Natives;

 	bool m_LoadingLocked;

 };

 extern CPluginManager g_PluginSys;

 #endif //_INCLUDE_SOURCEMOD_PLUGINSYSTEM_H_