/**

 * vim: set ts=4 :

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

 * SourceMod, Copyright (C) 2004-2007 AlliedModders LLC. 

 * All rights reserved.

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

 *

 *  This file is part of the SourceMod/SourcePawn SDK.  This file may only be 

 * used or modified under the Terms and Conditions of its License Agreement, 

 * which is found in public/licenses/LICENSE.txt.  As of this notice, derivative 

 * works must be licensed under the GNU General Public License (version 2 or 

 * greater).  A copy of the GPL is included under public/licenses/GPL.txt.

 * 

 * To view the latest information, see: http://www.sourcemod.net/license.php

 *

 * Version: $Id$

 */

#ifndef _INCLUDE_SOURCEMOD_IFACE_SHARE_SYS_H_

#define _INCLUDE_SOURCEMOD_IFACE_SHARE_SYS_H_

/**

 * @file IShareSys.h

 * @brief Defines the Share System, responsible for shared resources and dependencies.

 *

 *  The Share System also manages the Identity_t data type, although this is internally

 * implemented with the Handle System.

 */

#include <sp_vm_types.h>

namespace SourceMod

{

	class IExtension;

	struct IdentityToken_t;

	/** Forward declaration from IHandleSys.h */

	typedef unsigned int		HandleType_t;

	/** Forward declaration from IHandleSys.h */

	typedef HandleType_t		IdentityType_t;

	/**

	 * @brief Defines the base functionality required by a shared interface.

	 */

	class SMInterface

	{

	public:

		/**

		 * @brief Must return an integer defining the interface's version.

		 */

		virtual unsigned int GetInterfaceVersion() =0;

		/**

		 * @brief Must return a string defining the interface's unique name.

		 */

		virtual const char *GetInterfaceName() =0;

		/**

		 * @brief Must return whether the requested version number is backwards compatible.

		 * Note: This can be overridden for breaking changes or custom versioning.

		 * 

		 * @param version		Version number to compare against.

		 * @return				True if compatible, false otherwise.

		 */

		virtual bool IsVersionCompatible(unsigned int version)

		{

			if (version > GetInterfaceVersion())

			{

				return false;

			}

			return true;

		}

	};

	/**

	 * @brief Tracks dependencies and fires dependency listeners.

	 */

	class IShareSys

	{

	public:

		/**

		 * @brief Adds an interface to the global interface system.

		 *

		 * @param myself		Object adding this interface, in order to track dependencies.

		 * @param iface			Interface pointer (must be unique).

		 * @return				True on success, false otherwise.

		 */

		virtual bool AddInterface(IExtension *myself, SMInterface *iface) =0;

		/**

		 * @brief Requests an interface from the global interface system.

		 * If found, the interface's internal reference count will be increased.

		 *

		 * @param iface_name	Interface name.

		 * @param iface_vers	Interface version to attempt to match.

		 * @param myself		Object requesting this interface, in order to track dependencies.

		 * @param pIface		Pointer to store the return value in.

		 */

		virtual bool RequestInterface(const char *iface_name, 

										unsigned int iface_vers,

										IExtension *myself,

										SMInterface **pIface) =0;

		/**

		 * @brief Adds a list of natives to the global native pool, to be bound on plugin load.

		 * NOTE: Adding natives currently does not bind them to any loaded plugins.

		 * You must manually bind late natives.

		 * 

		 * @param myself		Identity token of parent object.

		 * @param natives		Array of natives to add.  The last entry must have NULL members.

		 */

		virtual void AddNatives(IExtension *myself, const sp_nativeinfo_t *natives) =0;

		/**

		 * @brief Creates a new identity type.

		 * NOTE: Module authors should never need to use this.  Due to the current implementation,

		 * there is a hardcoded limit of 15 types.  Core uses up a few, so think carefully!

		 *

		 * @param name			String containing type name.  Must not be empty or NULL.

		 * @return				A new HandleType_t identifier, or 0 on failure.

		 */

		virtual IdentityType_t CreateIdentType(const char *name) =0;

		/**

		 * @brief Finds an identity type by name.

		 * DEFAULT IDENTITY TYPES:

		 *  "PLUGIN"	- An IPlugin object.

		 *  "MODULE"	- An IModule object.

		 *  "CORE"		- An SMGlobalClass or other singleton.

		 * 

		 * @param name			String containing type name to search for.

		 * @return				A HandleType_t identifier if found, 0 otherwise.

		 */

		virtual IdentityType_t FindIdentType(const char *name) =0;

		/**

		 * @brief Creates a new identity token.  This token is guaranteed to be 

		 * unique amongst all other open identities.

		 *

		 * @param type			Identity type.

		 * @param ptr			Private data pointer (cannot be NULL).

		 * @return				A new IdentityToken_t pointer, or NULL on failure.

		 */

		virtual IdentityToken_t *CreateIdentity(IdentityType_t type, void *ptr) =0;

		/** 

		 * @brief Destroys an identity type.  Note that this will delete any identities

		 * that are under this type.  

		 *

		 * @param type			Identity type.

		 */

		virtual void DestroyIdentType(IdentityType_t type) =0;

		/**

		 * @brief Destroys an identity token.  Any handles being owned by this token, or

		 * any handles being 

		 *

		 * @param identity		Identity to remove.

		 */

		virtual void DestroyIdentity(IdentityToken_t *identity) =0;

		/**

		 * @brief Requires an extension.  This tells SourceMod that without this extension,

		 * your extension should not be loaded.  The name should not include the ".dll" or

		 * the ".so" part of the file name.

		 *

		 * @param myself		IExtension pointer to yourself.

		 * @param filename		File of extension to require.

		 * @param require		Whether or not this extension is a required dependency.

		 * @param autoload		Whether or not to autoload this extension.

		 */

		virtual void AddDependency(IExtension *myself, const char *filename, bool require, bool autoload) =0;

	};

}

#endif //_INCLUDE_SOURCEMOD_IFACE_SHARE_SYS_H_