/**

 * 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_PLUGINMNGR_INTERFACE_H_

#define _INCLUDE_SOURCEMOD_PLUGINMNGR_INTERFACE_H_

/**

 * @file IPluginSys.h

 * @brief Defines the interface for the Plugin System, which manages loaded plugins.

 */

#include <IShareSys.h>

#include <sp_vm_api.h>

#define SMINTERFACE_PLUGINSYSTEM_NAME		"IPluginManager"

#define SMINTERFACE_PLUGINSYSTEM_VERSION	2

/** Context user slot 3 is used Core for holding an IPluginContext pointer. */

#define SM_CONTEXTVAR_USER		3

namespace SourceMod

{

	class IPlugin;

	/** 

	 * @brief Encapsulates plugin public information exposed through "myinfo."

	 */

	typedef struct sm_plugininfo_s

	{

		const char *name;			/**< Plugin name */

		const char *author;			/**< Plugin author */

		const char *description;	/**< Plugin description */

		const char *version;		/**< Plugin version string */

		const char *url;			/**< Plugin URL */

	} sm_plugininfo_t;

	/**

	 * @brief Describes the usability status of a plugin.

	 */

	enum PluginStatus

	{

		Plugin_Running=0,		/**< Plugin is running */

		/* All states below are unexecutable */

		Plugin_Paused,			/**< Plugin is loaded but paused */

		Plugin_Error,			/**< Plugin is loaded but errored/locked */

		/* All states below do not have all natives */

		Plugin_Loaded,			/**< Plugin has passed loading and can be finalized */

		Plugin_Failed,			/**< Plugin has a fatal failure */

		Plugin_Created,			/**< Plugin is created but not initialized */

		Plugin_Uncompiled,		/**< Plugin is not yet compiled by the JIT */

		Plugin_BadLoad,			/**< Plugin failed to load */

	};

	/**

	 * @brief Describes the object lifetime of a plugin.

	 */

	enum PluginType

	{

		PluginType_Private,			/**< Plugin is privately managed and receives no forwards */

		PluginType_MapUpdated,		/**< Plugin will never be unloaded unless for updates on mapchange */

		PluginType_MapOnly,			/**< Plugin will be removed at mapchange */

		PluginType_Global,			/**< Plugin will never be unloaded or updated */

	};

	/**

	 * @brief Encapsulates a run-time plugin as maintained by SourceMod.

	 */

	class IPlugin

	{

	public:

		/** Virtual destructor */

		virtual ~IPlugin()

		{

		}

		/**

		 * @brief Returns the lifetime of a plugin.

		 */

		virtual PluginType GetType() =0;

		/**

		 * @brief Returns the current API context being used in the plugin.

		 *

		 * @return	Pointer to an IPluginContext, or NULL if not loaded.

		 */

		virtual SourcePawn::IPluginContext *GetBaseContext() =0;

		/**

		 * @brief Returns the context structure being used in the plugin.

		 *

		 * @return	Pointer to an sp_context_t, or NULL if not loaded.

		 */

		virtual sp_context_t *GetContext() =0;

		/**

		 * @brief Returns the plugin file structure.

		 *

		 * @return	Pointer to an sp_plugin_t, or NULL if not loaded.

		 */

		virtual const sp_plugin_t *GetPluginStructure() =0;

		/**

		 * @brief Returns information about the plugin by reference.

		 *

		 * @return			Pointer to a sm_plugininfo_t object, NULL if plugin is not loaded.

		 */

		virtual const sm_plugininfo_t *GetPublicInfo() =0;

		/**

		 * @brief Returns the plugin filename (relative to plugins dir).

		 */

		virtual const char *GetFilename() =0;

		/**

		 * @brief Returns true if a plugin is in debug mode, false otherwise.

		 */

		virtual bool IsDebugging() =0;

		/**

		 * @brief Returns the plugin status.

		 */

		virtual PluginStatus GetStatus() =0;

		/**

		 * @brief Sets whether the plugin is paused or not.

		 *

		 * @return			True on successful state change, false otherwise.

		 */

		virtual bool SetPauseState(bool paused) =0;

		/**

		 * @brief Returns the unique serial number of a plugin.

		 */

		virtual unsigned int GetSerial() =0;

		/**

		 * @brief Returns a plugin's identity token.

		 */

		virtual IdentityToken_t *GetIdentity() =0;

		/**

		 * @brief Sets a property on this plugin.  This is used for per-plugin

		 * data from extensions or other parts of core.  The property's value must 

		 * be manually destructed when the plugin is destroyed.

		 *

		 * @param prop		String containing name of the property.

		 * @param ptr		Generic pointer to set.

		 * @return			True on success, false if the property is already set.

		 */

		virtual bool SetProperty(const char *prop, void *ptr) =0;

		/**

		 * @brief Gets a property from a plugin.

		 *

		 * @param prop		String containing the property's name.

		 * @param ptr		Optional pointer to the generic pointer.

		 * @param remove	Optional boolean value; if true, property is removed

		 *					(so it can be set again).

		 * @return			True if the property existed, false otherwise.

		 */

		virtual bool GetProperty(const char *prop, void **ptr, bool remove=false) =0;

	};

	/**

	 * @brief Iterates over a list of plugins.

	 */

	class IPluginIterator

	{

	public:

		/** Virtual destructor */

		virtual ~IPluginIterator()

		{

		};

	public:

		/**

		 * @brief Returns true if there are more plugins in the iterator.

		 */

		virtual bool MorePlugins() =0;

		/**

		 * @brief Returns the plugin at the current iterator position.

		 */

		virtual IPlugin *GetPlugin() =0;

		/**

		 * @brief Advances to the next plugin in the iterator.

		 */

		virtual void NextPlugin() =0;

		/**

		 * @brief Destroys the iterator object.

		 * Note: You may use 'delete' in lieu of this function.

		 */

		virtual void Release() =0;

	};

	/**

	 * @brief Listens for plugin-oriented events.

	 */

	class IPluginsListener

	{

	public:

		/**

		 * @brief Called when a plugin is created/mapped into memory.

		 */

		virtual void OnPluginCreated(IPlugin *plugin)

		{

		}

		/**

		 * @brief Called when a plugin is fully loaded successfully.

		 */

		virtual void OnPluginLoaded(IPlugin *plugin)

		{

		}

		/**

		* @brief Called when a plugin is paused or unpaused.

		*/

		virtual void OnPluginPauseChange(IPlugin *plugin, bool paused)

		{

		}

		/**

		 * @brief Called when a plugin is unloaded (only if fully loaded).

		 */

		virtual void OnPluginUnloaded(IPlugin *plugin)

		{

		}

		/**

		 * @brief Called when a plugin is destroyed.

		 * NOTE: Always called if Created, even if load failed.

		 */

		virtual void OnPluginDestroyed(IPlugin *plugin)

		{

		}

	};

	/**

	 * @brief Manages the runtime loading and unloading of plugins.

	 */

	class IPluginManager : public SMInterface

	{

	public:

		virtual const char *GetInterfaceName()

		{

			return SMINTERFACE_PLUGINSYSTEM_NAME;

		}

		virtual unsigned int GetInterfaceVersion()

		{

			return SMINTERFACE_PLUGINSYSTEM_VERSION;

		}

	public:

		/**

		 * @brief Attempts to load a plugin.

		 *

		 * @param path		Path and filename of plugin, relative to plugins folder.

		 * @param debug		Whether or not to default the plugin into debug mode.

		 * @param type		Lifetime of the plugin.

		 * @param error		Buffer to hold any error message.

		 * @param maxlength	Maximum length of error message buffer.

		 * @param wasloaded	Stores if the plugin is already loaded.

		 * @return			A new plugin pointer on success, false otherwise.

		 */

		virtual IPlugin *LoadPlugin(const char *path, 

									bool debug,

									PluginType type,

									char error[],

									size_t maxlength,

									bool *wasloaded) =0;

		/**

		 * @brief Attempts to unload a plugin.

		 *

		 * @param plugin	Pointer to the plugin handle.

		 * @return			True on success, false otherwise.

		 */

		virtual bool UnloadPlugin(IPlugin *plugin) =0;

		/**

		 * @brief Finds a plugin by its context.

		 * Note: This function should be considered O(1).

		 *

		 * @param ctx		Pointer to an sp_context_t.

		 * @return			Pointer to a matching IPlugin, or NULL if none found.

		 */

		virtual IPlugin *FindPluginByContext(const sp_context_t *ctx) =0;

		/**

		 * @brief Returns the number of plugins (both failed and loaded).

		 *

		 * @return			The number of internally cached plugins.

		 */

		virtual unsigned int GetPluginCount() =0;

		/**

		 * @brief Returns a pointer that can be used to iterate through plugins.

		 * Note: This pointer must be freed using EITHER delete OR IPluginIterator::Release().

		 */

		virtual IPluginIterator *GetPluginIterator() =0;

		/** 

		 * @brief Adds a plugin manager listener.

		 *

		 * @param listener	Pointer to a listener.

		 */

		virtual void AddPluginsListener(IPluginsListener *listener) =0;

		/**

		 * @brief Removes a plugin listener.

		 * 

		 * @param listener	Pointer to a listener.

		 */

		virtual void RemovePluginsListener(IPluginsListener *listener) =0;

	};

}

#endif //_INCLUDE_SOURCEMOD_PLUGINMNGR_INTERFACE_H_