/*
   Copyright (C) 2001-2006, William Joseph.
   All Rights Reserved.

   This file is part of GtkRadiant.

   GtkRadiant is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   GtkRadiant 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 GtkRadiant; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#if !defined( INCLUDED_IFILESYSTEM_H )
#define INCLUDED_IFILESYSTEM_H

#include <cstddef>
#include "generic/constant.h"
#include "generic/callback.h"

typedef Callback<void(const char*)> ArchiveNameCallback;
typedef Callback<void(const char*)> FileNameCallback;

class ArchiveFile;
class ArchiveTextFile;
class Archive;

class ModuleObserver;

typedef struct _GSList GSList;

/// The Virtual File System.
class VirtualFileSystem
{
public:
INTEGER_CONSTANT( Version, 1 );
STRING_CONSTANT( Name, "VFS" );

/// \brief Adds a root search \p path.
/// Called before \c initialise.
virtual void initDirectory( const char *path ) = 0;
/// \brief Initialises the filesystem.
/// Called after all root search paths have been added.
virtual void initialise() = 0;
/// \brief Clear the filesystem if supported
virtual void clear() = 0;
/// \brief Reload the filesystem if supported
virtual void refresh() = 0;
/// \brief Shuts down the filesystem.
virtual void shutdown() = 0;

/// \brief Returns the file identified by \p filename opened in binary mode, or 0 if not found.
/// The caller must \c release() the file returned if it is not 0.
virtual ArchiveFile* openFile( const char* filename ) = 0;
/// \brief Returns the file identified by \p filename opened in text mode, or 0 if not found.
/// The caller must \c release() the file returned if it is not 0.
virtual ArchiveTextFile* openTextFile( const char* filename ) = 0;

/// \brief Opens the file identified by \p filename and reads it into \p buffer, or sets *\p buffer to 0 if not found.
/// Returns the size of the buffer allocated, or undefined value if *\p buffer is 0;
/// The caller must free the allocated buffer by calling \c freeFile
/// \deprecated Deprecated - use \c openFile.
virtual std::size_t loadFile( const char *filename, void **buffer ) = 0;
/// \brief Frees the buffer returned by \c loadFile.
/// \deprecated Deprecated.
virtual void freeFile( void *p ) = 0;

/// \brief Calls \p callback for each directory under \p basedir.
virtual void forEachDirectory( const char* basedir, const FileNameCallback& callback, std::size_t depth = 1 ) = 0;
/// \brief Calls \p callback for each file under \p basedir matching \p extension.
/// Use "*" as \p extension to match all file extensions.
virtual void forEachFile( const char* basedir, const char* extension, const FileNameCallback& callback, std::size_t depth = 1 ) = 0;

/// \brief Returns a list containing the relative names of all the directories under \p basedir.
/// The caller must free the returned list by calling \c clearFileDirList;
/// \deprecated Deprecated - use \c forEachDirectory.
virtual GSList* getDirList( const char *basedir ) = 0;
/// \brief Returns a list containing the relative names of the files under \p basedir (\p extension can be "*" for all files).
/// The caller must free the returned list by calling \c clearFileDirList.
/// \deprecated Deprecated - use \c forEachFile.
virtual GSList* getFileList( const char *basedir, const char *extension ) = 0;
/// \brief Frees the \p list returned from \c getDirList or \c getFileList.
/// \deprecated Deprecated.
virtual void clearFileDirList( GSList **list ) = 0;

/// \brief Returns the absolute filename for a relative \p name, or "" if not found.
virtual const char* findFile( const char* name ) = 0;
/// \brief Returns the filesystem root for an absolute \p name, or "" if not found.
/// This can be used to convert an absolute name to a relative name.
virtual const char* findRoot( const char* name ) = 0;

/// \brief Attach an \p observer whose realise() and unrealise() methods will be called when the filesystem is initialised or shut down.
virtual void attach( ModuleObserver& observer ) = 0;
/// \brief Detach an \p observer previously-attached by calling \c attach.
virtual void detach( ModuleObserver& observer ) = 0;

virtual Archive* getArchive( const char* archiveName, bool pakonly = true ) = 0;
virtual void forEachArchive( const ArchiveNameCallback& callback, bool pakonly = true, bool reverse = false ) = 0;
};

#include "modulesystem.h"

template<typename Type>
class GlobalModule;
typedef GlobalModule<VirtualFileSystem> GlobalFileSystemModule;

template<typename Type>
class GlobalModuleRef;
typedef GlobalModuleRef<VirtualFileSystem> GlobalFileSystemModuleRef;

inline VirtualFileSystem& GlobalFileSystem(){
	return GlobalFileSystemModule::getTable();
}


/// \deprecated Use \c openFile.
inline int vfsLoadFile( const char* filename, void** buffer, int index = 0 ){
	return static_cast<int>( GlobalFileSystem().loadFile( filename, buffer ) );
}

/// \deprecated Deprecated.
inline void vfsFreeFile( void* p ){
	GlobalFileSystem().freeFile( p );
}

#endif
