#ifndef _INCLUDE_SOURCEMOD_PLUGINSYSTEM_H_

 #define _INCLUDE_SOURCEMOD_PLUGINSYSTEM_H_

 #include <time.h>

 #include <IPluginSys.h>

 #include <sh_list.h>

 #include <sh_stack.h>

 #include "sm_globals.h"

 #include "CFunction.h"

 #include "PluginInfoDatabase.h"

 #include "sm_trie.h"

 using namespace SourceHook;

 /**

  * NOTES:

  *

  *  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, OnPluginInit() is called

  */

 #define SM_CONTEXTVAR_MYSELF	0

 struct ContextPair

 {

 	ContextPair() : base(NULL), ctx(NULL), co(NULL)

 	{

 	};

 	IPluginContext *base;

 	sp_context_t *ctx;

 	ICompilation *co;

 	IVirtualMachine *vm;

 };

 class CPlugin : public IPlugin

 {

 	friend class CPluginManager;

 	friend class CFunction;

 public:

 	CPlugin(const char *file);

 	~CPlugin();

 public:

 	virtual PluginType GetType() const;

 	virtual SourcePawn::IPluginContext *GetBaseContext() const;

 	virtual sp_context_t *GetContext() const;

 	virtual const sm_plugininfo_t *GetPublicInfo() const;

 	virtual const char *GetFilename() const;

 	virtual bool IsDebugging() const;

 	virtual PluginStatus GetStatus() const;

 	virtual bool SetPauseState(bool paused);

 	virtual unsigned int GetSerial() const;

 	virtual const sp_plugin_t *GetPluginStructure() const;

 	virtual IPluginFunction *GetFunctionByName(const char *public_name);

 	virtual IPluginFunction *GetFunctionById(funcid_t func_id);

 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:

 	/**

 	 * Starts the initial compilation of a plugin.

 	 * Returns false if another compilation exists or there is a current context set.

 	 */

 	ICompilation *StartMyCompile(IVirtualMachine *vm);

 	/** 

 	 * Finalizes a compilation.  If error buffer is NULL, the error is saved locally.

 	 */

 	bool FinishMyCompile(char *error, size_t maxlength);

 	void CancelMyCompile();

 	/**

 	 * Sets an error state on the plugin

 	 */

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

 	/**

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

 	 * NOTE: Valid pre-states are: Plugin_Created

 	 * 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 OnPluginInit function.

 	 * NOTE: Valid pre-states are: Plugin_Created

 	 * NOTE: Pre-state will be changed to Plugin_Running

 	 */

 	void Call_OnPluginInit();

 public:

 	time_t HasUpdatedFile();

 protected:

 	void UpdateInfo();

 private:

 	ContextPair m_ctx;

 	PluginType m_type;

 	char m_filename[PLATFORM_MAX_PATH+1];

 	PluginStatus m_status;

 	unsigned int m_serial;

 	sm_plugininfo_t m_info;

 	sp_plugin_t *m_plugin;

 	unsigned int m_funcsnum;

 	CFunction **m_priv_funcs;

 	CFunction **m_pub_funcs;

 	char m_errormsg[256];

 	time_t m_LastAccess;

 };

 class CPluginManager : public IPluginManager

 {

 	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();

 		virtual void Release();

 	public:

 		void Reset();

 	private:

 		List<CPlugin *> *mylist;

 		List<CPlugin *>::iterator current;

 	};

 	friend class CPluginManager::CPluginIterator;

 public: //IPluginManager

 	virtual IPlugin *LoadPlugin(const char *path, 

 								bool debug,

 								PluginType type,

 								char error[],

 								size_t err_max);

 	virtual bool UnloadPlugin(IPlugin *plugin);

 	virtual IPlugin *FindPluginByContext(const sp_context_t *ctx);

 	virtual unsigned int GetPluginCount();

 	virtual IPluginIterator *GetPluginIterator();

 	virtual void AddPluginsListener(IPluginsListener *listener);

 	virtual void RemovePluginsListener(IPluginsListener *listener);

 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);

 	/**

 	 * Registers natives in core itself ONLY.

 	 */

 	void RegisterGlobalNatives(sp_nativeinfo_t *info[]);

 	/** 

 	 * Returns whether anything loaded will be a late load.

 	 */

 	bool IsLateLoadTime();

 private:

 	/**

 	 * Recursively loads all plugins in the given directory.

 	 */

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

 	/**

 	 * Loads a plugin using automatic information.

 	 * The file must be relative to the plugins folder.

 	 */

 	void LoadAutoPlugin(const char *file);

 	/**

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

 	 */

 	void AddPlugin(CPlugin *pPlugin);

 	/**

 	 * Runs the second loading pass on a plugin.

 	 */

 	void RunSecondPass(CPlugin *pPlugin);

 	/**

 	 * Adds any globally registered natives to a plugin

 	 */

 	void AddCoreNativesToPlugin(CPlugin *pPlugin);

 protected:

 	/**

 	 * Caching internal objects

 	 */

 	void ReleaseIterator(CPluginIterator *iter);

 	CFunction *GetFunctionFromPool(funcid_t f, CPlugin *plugin);

 	void ReleaseFunctionToPool(CFunction *func);

 private:

 	List<IPluginsListener *> m_listeners;

 	List<CPlugin *> m_plugins;

 	List<sp_nativeinfo_t *> m_natives;

 	CStack<CPluginManager::CPluginIterator *> m_iters;

 	CStack<CFunction *> m_funcpool;

 	CPluginInfoDatabase m_PluginInfo;

 	Trie *m_LoadLookup;

 	bool m_AllPluginsLoaded;

 };

 extern CPluginManager g_PluginSys;

 #endif //_INCLUDE_SOURCEMOD_PLUGINSYSTEM_H_