/**

 * vim: set ts=4 :

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

 * SourceMod

 * Copyright (C) 2004-2007 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_LIBRARY_INTERFACE_SYS_H_

#define _INCLUDE_SOURCEMOD_LIBRARY_INTERFACE_SYS_H_

/**

 * @file ILibrarySys.h

 * @brief Defines platform-dependent operations, such as opening libraries and files.

 */

#include <IShareSys.h>

namespace SourceMod

{

	#define SMINTERFACE_LIBRARYSYS_NAME		"ILibrarySys"

	#define SMINTERFACE_LIBRARYSYS_VERSION	3

	class ILibrary

	{

	public:

		/** Virtual destructor (calls CloseLibrary) */

		virtual ~ILibrary()

		{

		};

	public:

		/**

		 * @brief Closes dynamic library and invalidates pointer.

		 */

		virtual void CloseLibrary() =0;

		/**

		 * @brief Retrieves a symbol pointer from the dynamic library.

		 *

		 * @param symname	Symbol name.

		 * @return			Symbol pointer, NULL if not found.

		 */

		virtual void *GetSymbolAddress(const char *symname) =0;

	};

	/**

	 * @brief Directory browsing abstraction.

	 */

	class IDirectory

	{

	public:

		/** Virtual destructor */

		virtual ~IDirectory()

		{

		}

	public:

		/**

		 * @brief Returns true if there are more files to read, false otherwise.

		 */

		virtual bool MoreFiles() =0;

		/**

		 * @brief Advances to the next entry in the stream.

		 */

		virtual void NextEntry() =0;

		/**

		 * @brief Returns the name of the current entry.

		 */

		virtual const char *GetEntryName() =0;

		/**

		 * @brief Returns whether the current entry is a directory.

		 */

		virtual bool IsEntryDirectory() =0;

		/**

		 * @brief Returns whether the current entry is a file.

		 */

		virtual bool IsEntryFile() =0;

		/**

		 * @brief Returns true if the current entry is valid

		 *        (Used similarly to MoreFiles).

		 */

		virtual bool IsEntryValid() =0;

	};

	/**

	 * @brief Contains various operating system specific code.

	 */

	class ILibrarySys : public SMInterface

	{

	public:

		virtual const char *GetInterfaceName()

		{

			return SMINTERFACE_LIBRARYSYS_NAME;

		}

		virtual unsigned int GetInterfaceVersion()

		{

			return SMINTERFACE_LIBRARYSYS_VERSION;

		}

	public:

		/**

		 * @brief Opens a dynamic library file.

		 * 

		 * @param path		Path to library file (.dll/.so).

		 * @param error		Buffer for any error message (may be NULL).

		 * @param maxlength	Maximum length of error buffer.

		 * @return			Pointer to an ILibrary, NULL if failed.

		 */

		virtual ILibrary *OpenLibrary(const char *path, char *error, size_t maxlength) =0;

		/**

		 * @brief Opens a directory for reading.

		 *

		 * @param path		Path to directory.

		 * @return			Pointer to an IDirectory, NULL if failed.

		 */

		virtual IDirectory *OpenDirectory(const char *path) =0;

		/**

		 * @brief Closes a directory and frees its handle.

		 * 

		 * @param dir		Pointer to IDirectory.

		 */

		virtual void CloseDirectory(IDirectory *dir) =0;

		/**

		 * @brief Returns true if a path exists.

		 */

		virtual bool PathExists(const char *path) =0;

		/**

		 * @brief Returns true if the path is a normal file.

		 */

		virtual bool IsPathFile(const char *path) =0;

		/**

		 * @brief Returns true if the path is a normal directory.

		 */

		virtual bool IsPathDirectory(const char *path) =0;

		/**

		 * @brief Gets a platform-specific error message.

		 * This should only be called when an ILibrary function fails.

		 * Win32 equivalent: GetLastError() + FormatMessage()

		 * POSIX equivalent: errno + strerror()

		 *

		 * @param error		Error message buffer.

		 * @param maxlength	Maximum length of error buffer.

		 */

		virtual void GetPlatformError(char *error, size_t maxlength) =0;

		/**

		 * @brief Formats a string similar to snprintf(), except

		 * corrects all non-platform compatible path separators to be

		 * the correct platform character.

		 *

		 * @param buffer	Output buffer pointer.

		 * @param maxlength	Output buffer size.

		 * @param pathfmt	Format string of path.

		 * @param ...		Format string arguments.

		 */

		virtual size_t PathFormat(char *buffer, size_t maxlength, const char *pathfmt, ...) =0;

		/**

		 * @brief Returns a pointer to the extension in a filename.

		 *

		 * @param filename	Name of file from which the extension should be extracted.

		 * @return			Pointer to file extension.

		 */

		virtual const char *GetFileExtension(const char *filename) =0;

		/**

		 * @brief Creates a directory.

		 *

		 * @param path		Full, absolute path of the directory to create.

		 * @return			True on success, false otherwise.

		 */

		virtual bool CreateFolder(const char *path) =0;

	};

}

#endif //_INCLUDE_SOURCEMOD_LIBRARY_INTERFACE_SYS_H_