/*
 * This file is a part of Winix
 * and is not publicly distributed
 * 
 * Copyright (c) 2008-2012, Tomasz Sowa
 * All rights reserved.
 * 
 */
 
#ifndef headerfile_winix_core_log
#define headerfile_winix_core_log


#include <sstream>
#include <fstream>
#include <iostream>
#include <string>
#include "textstream.h"
#include "logmanipulators.h"
#include "textstream/textstream.h"


class TimeZones;



class Log
{
public:

	Log();
	~Log();

	void SetTimeZones(TimeZones * ptime_zones);
	void Init(int log_level_, bool save_each_line_, const std::string & log_file_, bool log_std, int log_max_requests);

	Log & operator<<(const void * s);
	Log & operator<<(const char * s);
	Log & operator<<(const std::string * s);
	Log & operator<<(const std::string & s);
	Log & operator<<(const wchar_t * s);
	Log & operator<<(const std::wstring * s);
	Log & operator<<(const std::wstring & s);
	Log & operator<<(int s);
	Log & operator<<(long s);
	Log & operator<<(char s);
	Log & operator<<(wchar_t s);
	Log & operator<<(size_t s);
	Log & operator<<(double s);
	Log & operator<<(const PT::Space & space);
	Log & operator<<(LogManipulators m);
	Log & operator<<(const PT::Date & date);

	void PrintDate(const PT::Date & date, size_t time_zone_id);

	template<typename char_type, size_t stack_size, size_t heap_block_size>
	Log & operator<<(const PT::TextStreamBase<char_type, stack_size, heap_block_size> & buf);


	template<class StringType>
	void LogString(const StringType & value, size_t max_size);

	void LogBinary(const char * blob, size_t blob_len);
	void LogBinary(const std::string & blob);


	void SystemErr(int err);
	void SaveLog();
	void SaveLogAndClear();

	int LogLevel();


private:

	// time zones for printing the time in the log file
	TimeZones * time_zones;

	// buffer for the log
	TextStream<std::wstring> buffer;

	// log lovel from the config file
	int log_level;

	// current level set by a modifier (e.g. log << log3)
	int current_level;

	// current request for logging
	// starts from zero and incremented after logendrequest modifier
	int request;
	
	// how many request to save at once
	int max_requests;

	// file log
	std::string log_file;
	std::ofstream file;

	// logging to stdout
	bool log_stdout;

	// how many lines there are in the buffer
	int lines;

	// is the config file already open
	bool log_file_open;

	// how many lines can be in the config buffer
	// default: 5000
	int max_lines;

	// whether to save each line (for debug)
	bool save_each_line;

	void OpenFile();
	char GetHEXdigit(unsigned char c);
	void ToHEX(char * buf, unsigned char c);

};



template<class StringType>
void Log::LogString(const StringType & value, size_t max_size)
{
size_t min_size = value.size() < max_size ? value.size() : max_size;
	
	if( current_level <= log_level )
	{
		for(size_t i=0 ; i<min_size ; ++i)
		{
			if( value[i] < 32 )
				buffer << '.';
			else
				buffer << value[i];
		}
	}
}



template<typename char_type, size_t stack_size, size_t heap_block_size>
Log & Log::operator<<(const PT::TextStreamBase<char_type, stack_size, heap_block_size> & buf)
{
	if( current_level > log_level )
		return *this;

	typename PT::TextStreamBase<char_type, stack_size, heap_block_size>::const_iterator i = buf.begin();

	// in the future we change buffer to PT::TextStreamBuffer
	// so then there'll be << operator

	for( ; i != buf.end() ; ++i)
		buffer << *i;

return *this;
}





extern Log log;
extern Log nlog;

// for convenience, we have to use only #include "log.h" in the winix
#include "slog.h"


#endif