/* 
 * bfVFS : vfs/Tools/vfs_log.h
 *  - simple file logger
 *
 * Copyright (C) 2008 - 2010 (BF) john.bf.smith@googlemail.com
 * 
 * This file is part of the bfVFS library
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

#ifndef _VFS_LOG_H_
#define _VFS_LOG_H_

#include <vfs/Core/vfs_types.h>
#include <vfs/Core/vfs_file_raii.h>
#include <vfs/Core/File/vfs_file.h>
#include <vfs/Core/Interface/vfs_file_interface.h>
#include <vfs/Tools/vfs_tools.h>
#include <vfs/Aspects/vfs_synchronization.h>

namespace vfs
{
	class VFS_API IRefCountable
	{
	public:
		IRefCountable() : _ref_count(1) {}
		virtual ~IRefCountable() {}

		virtual int Reserve()  { return Register();    }
		virtual int Release()  { return UnRegister();  }
		virtual int RefCount() { return GetRefCount(); }

	protected:
		int Register() {
			return ++_ref_count;
		}
		int UnRegister() {
			int tmp_count = --_ref_count;
			if(_ref_count <= 0) {
				delete this;
			}
			return tmp_count;
		}
		int GetRefCount() {
			return _ref_count;
		}
	private:
		int _ref_count;
	};

	class VFS_API Log : public IRefCountable
	{
	public:
		enum EFlushMode
		{
			FLUSH_ON_DELETE,
			FLUSH_ON_ENDL,
			FLUSH_BUFFER,
			FLUSH_IMMEDIATELY,
		};
		enum _endl{endl};
	public:

		Log(vfs::Path const& fileName, bool use_vfs_file, bool append = false, EFlushMode flushMode = FLUSH_ON_DELETE);
		Log(vfs::tWritableFile* file, bool append = false, EFlushMode flushMode = FLUSH_ON_DELETE);
		virtual ~Log();

		// reimplemented for synchronization
		virtual int Reserve();
		virtual int Release();
		virtual int RefCount();

		// don't explicitely call destroy if you haven't explicitely created the object
		void			destroy();

		void			releaseFile();

		static Log*		create(vfs::Path const& fileName, bool append = false, EFlushMode flushMode = FLUSH_ON_DELETE);
		static Log*		create(vfs::tWritableFile* file, bool append = false, EFlushMode flushMode = FLUSH_ON_DELETE);
		static void		flushReleaseAll();
		static void		flushDeleteAll();

		static vfs::String const&	getSharedString();
		static void					setSharedString(vfs::String const& str);

		Log& operator<<(vfs::UInt64 const& t);
		Log& operator<<(vfs::UInt32 const& t);
		Log& operator<<(vfs::UInt16 const& t);
		Log& operator<<(vfs::UInt8  const& t);

		Log& operator<<(vfs::Int64 const& t);
		Log& operator<<(vfs::Int32 const& t);
		Log& operator<<(vfs::Int16 const& t);
		Log& operator<<(vfs::Int8  const& t);

#ifdef _MSC_VER
		Log& operator<<(DWORD const& t);
#endif
		Log& operator<<(float const& t);
		Log& operator<<(double const& t);

		Log& operator<<(const char* t);
		Log& operator<<(const wchar_t* t);
		Log& operator<<(std::string const& t);
		Log& operator<<(std::wstring const& t);
		Log& operator<<(vfs::String const& t);

		Log& operator<<(void* const& t);

		Log& operator<<(vfs::Log::_endl const& endl);

		void setAppend(bool append = true);
		void setBufferSize(vfs::UInt32 bufferSize);


		void lock();
		void unlock();

		void		flush();
		EFlushMode	flushMode();
		void		flushMode(EFlushMode fmode);

	private:
		void _test_flush(bool force=false);

		template<typename T_>
		Log& pushNumber(T_ const& t)
		{
			_buffer << toString<char>(t);
			_buffer_size += sizeof(T_);
			_test_flush();
			return *this;
		}
	private:
		vfs::Path				_filename;
		vfs::tWritableFile*		_file;
		bool					_own_file;
		bool					_first_write;
		EFlushMode				_flush_mode;
		bool					_append;
		::size_t				_buffer_size, _buffer_test_size;
		std::stringstream		_buffer;

		vfs::Aspects::Mutex		_mutex;
	private:
		static std::list<Log*>& _logs();
		static vfs::String		_shared_id_str;
	};
} // end namespace vfs

#endif // _VFS_LOG_H_