/* ======== SourceMM ========
* Copyright (C) 2004-2005 Metamod:Source Development Team
* No warranties of any kind
*
* License: zlib/libpng
*
* Author(s): David "BAILOPAN" Anderson
* ============================
*/

#ifndef _INCLUDE_ISMM_PLUGIN_H
#define _INCLUDE_ISMM_PLUGIN_H

/**
 * @brief Plugin API interface
 * @file ISmmPlugin.h
 */

#include <interface.h>
#include <sourcehook/sourcehook.h>
#include "ISmmAPI.h"

#define PLAPI_VERSION	8
#define PLAPI_NAME		"ISmmPlugin"

class ISmmAPI;

class ISmmPlugin
{
public:
	virtual int GetApiVersion() { return PLAPI_VERSION; }
	virtual ~ISmmPlugin() { }
public:
	/**
	 * @brief Called on plugin load.
	 * NOTE - As of API 7, this is called as DLLInit() executes - after the parameters are known, but before 
	 *  the original GameDLL function is called.  Therefore, you cannot hook it, but you don't need to - 
	 *  Load() is basically your hook.
	 * NOTE - As of API 7, you can override factories before the engine and gamedll exchange them.
	 *  However, take care to note that if your plugin is unloaded, and the gamedll/engine have cached
	 *  an interface you've passed, something will definitely crash.  Be careful.
	 *
	 * @param id	Internal id of plugin.  Saved globally by PLUGIN_SAVEVARS()
	 * @param ismm	External API for SourceMM.  Saved globally by PLUGIN_SAVEVARS()
	 * @param list	Contains a list of factories.  Hook a factory call by setting one equal to your own function.
	 * @param late	Set to true if your plugin was loaded late (not at server load).
	 * @param error Error message buffer
	 * @param maxlen Size of error message buffer
	 * @return		True if successful, return false to reject the load.
	 */
	virtual bool Load(PluginId id, ISmmAPI *ismm, char *error, size_t maxlength, bool late) =0;

	/**
	 * @brief Called when your plugin is "queried".  This is useful for rejecting a loaded
	 *  state.  For example, if your plugin wants to stop operating, it can simply return
	 *  false and copy an error message.  This will notify other plugins or MM:S of something
	 *  bad that happened.  NOTE - MM:S will not cache the return state, so if you return false,
	 *  your plugin will not actually be paused or unloaded.  This callback will be called when:
	 *  - Another plugin requests it
	 *  - Someone types "meta list", it will show up as "REFUSED"
	 *  - When Metamod need to re-check the plugin's status
	 *  - If the plugin does something like overload a factory, Metamod will make sure the Query() returns true
	 *    before calling it.
	 *  Also note that this query will only override Metamod when the plugin is running and not paused.
	 *
	 * @param error		Buffer for error message.  This can be NULL!
	 * @param maxlen	Maximum length of error buffer.
	 * @return			Status code - true for okay, false for badness.
	 */
	virtual bool QueryRunning(char *error, size_t maxlen)
	{
		return true;
	}

	/** 
	 * @brief Called on plugin unload.  You can return false if you know your plugin
	 *  is not capable of restoring critical states it modifies.
	 *
	 * @param	error Error message buffer
	 * @param	maxlen Size of error message buffer
	 * @return	True on success, return false to request no unload.
	 */
	virtual bool Unload(char *error, size_t maxlen)
	{
		return true;
	}

	/** @brief Called on plugin pause.
	 *
	 * @param	error Error message buffer
	 * @param	maxlen Size of error message buffer
	 * @return	True on success, return false to request no pause.
	 */
	virtual bool Pause(char *error, size_t maxlen)
	{
		return true;
	}

	/** @brief Called on plugin unpause.
	 *
	 * @param	error Error message buffer
	 * @param	maxlen Size of error message buffer
	 * @return	True on success, return false to request no unpause.
	 */
	virtual bool Unpause(char *error, size_t maxlen)
	{
		return true;
	}
public:
	/** @brief Return author as string */
	virtual const char *GetAuthor() =0;

	/** @brief Return plugin name as string */
	virtual const char *GetName() =0;

	/** @brief Return a description as string */
	virtual const char *GetDescription() =0;

	/** @brief Return a URL as string */
	virtual const char *GetURL() =0;

	/** @brief Return quick license code as string */
	virtual const char *GetLicense() =0;

	/** @brief Return version as string */
	virtual const char *GetVersion() =0;

	/** @brief Return author as string */
	virtual const char *GetDate() =0;

	/** @brief Return author as string */
	virtual const char *GetLogTag() =0;
public:
	/**
	 * @brief Called when all plugins have been loaded - API version 4
	 *
	 * This is useful for knowing when it's safe to request things another plugin might have.
	 * NOTE for API 7 - This is called after DLLInit(). 
	 */
	virtual void AllPluginsLoaded()
	{
	}
};

/**
 * @brief Added in 1.1 so plugins could listen to specific events
 */
class IMetamodListener
{
public:
	virtual ~IMetamodListener() { }
public:
	virtual void OnPluginLoad(PluginId id) { }

	virtual void OnPluginUnload(PluginId id) { }

	virtual void OnPluginPause(PluginId id) { }

	virtual void OnPluginUnpause(PluginId id) { }

	virtual void OnLevelInit(char const *pMapName, char const *pMapEntities, char const *pOldLevel, char const *pLandmarkName, bool loadGame, bool background) { }

	virtual void OnLevelShutdown() { }

	virtual void *OnEngineQuery(const char *iface, int *ret)
	{
		if (ret)
			*ret = IFACE_FAILED;
		return NULL; 
	}

	virtual void *OnPhysicsQuery(const char *iface, int *ret)
	{
		if (ret)
			*ret = IFACE_FAILED;
		return NULL; 
	}

	virtual void *OnFileSystemQuery(const char *iface, int *ret)
	{
		if (ret)
			*ret = IFACE_FAILED;
		return NULL; 
	}

	virtual void *OnGameDLLQuery(const char *iface, int *ret)
	{
		if (ret)
			*ret = IFACE_FAILED;
		return NULL; 
	}

	virtual void *OnMetamodQuery(const char *iface, int *ret)
	{
		if (ret)
			*ret = IFACE_FAILED;
		return NULL; 	
	}
};

#define PL_EXPOSURE		CreateInterface
#define PL_EXPOSURE_C	"CreateInterface"

#define PLUGIN_EXPOSE(name, var) \
	ISmmAPI *g_SMAPI = NULL; \
	ISmmPlugin *g_PLAPI = NULL; \
	PluginId g_PLID = (PluginId)0; \
	SourceHook::ISourceHook *g_SHPtr = NULL; \
	SMM_API void *PL_EXPOSURE(const char *name, int *code) { \
		if (name && !strcmp(name, PLAPI_NAME)) { \
			return static_cast<void *>(&var); \
		} \
		return NULL; \
	}

#define PLUGIN_GLOBALVARS()	\
	extern SourceHook::ISourceHook *g_SHPtr; \
	extern ISmmAPI *g_SMAPI; \
	extern ISmmPlugin *g_PLAPI; \
	extern PluginId g_PLID; 

#define PLUGIN_SAVEVARS() \
	g_SMAPI = ismm; \
	g_SHPtr = static_cast<SourceHook::ISourceHook *>(ismm->MetaFactory(MMIFACE_SOURCEHOOK, NULL, NULL)); \
	g_PLAPI = static_cast<ISmmPlugin *>(this); \
	g_PLID = id;

#define META_LOG				g_SMAPI->LogMsg
#define META_REGCMD(name)		g_SMAPI->RegisterConCmdBase(g_PLAPI, name##_command)
#define META_REGCVAR(var)		g_SMAPI->RegisterConCmdBase(g_PLAPI, var)
#define META_UNREGCMD(name)		g_SMAPI->UnregisterConCmdBase(g_PLAPI, name##_command)
#define META_UNREGCVAR(var)		g_SMAPI->UnregisterConCmdBase(g_PLAPI, var)
#define	META_CONPRINT			g_SMAPI->ConPrint
#define META_CONPRINTF			g_SMAPI->ConPrintf

//probably should use this up above someday
#define CONCMD_VARNAME(name) name##_command

#if !defined SMM_API
#if defined __WIN32__ || defined _WIN32 || defined WIN32
	#define SMM_API extern "C" __declspec(dllexport)
#elif defined __GNUC__
	#define SMM_API	extern "C"
#endif
#endif //!defined SMM_API

#endif //_INCLUDE_ISMM_PLUGIN_H