/*
 * This file is a part of Winix
 * and is distributed under the 2-Clause BSD licence.
 * Author: Tomasz Sowa <t.sowa@ttmath.org>
 */

/* 
 * Copyright (c) 2008-2014, Tomasz Sowa
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 * 
 * 2. Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 * 
 */
 
#include "log.h"
#include <ctime>
#include <string.h>
#include "utf8/utf8.h"
#include "timezones.h"


namespace Winix
{



Log::Log()
{
	log_level     = 1;
	current_level = 100; // nothing to log (call Init() first)
	request       = 0;
	max_requests  = 1;
	lines         = 0;
	max_lines     = 5000;
	log_file_open = false;
	time_zones    = 0;
}


Log::~Log()
{
	SaveLogAndClear();
}



void Log::SetTimeZones(TimeZones * ptime_zones)
{
	time_zones = ptime_zones;
}



int Log::LogLevel()
{
	return log_level;
}



void Log::Init(int log_level_, bool save_each_line_, const std::wstring & log_file_, bool log_std, int log_max_requests)
{
	log_level      = log_level_;
	log_stdout     = log_std;
	max_requests   = log_max_requests;
	save_each_line = save_each_line_;

	PT::WideToUTF8(log_file_, log_file);
	// don't open the file here
	// because it would be created with the root as an owner
}


void Log::OpenFile()
{
	if( !log_file.empty() )
	{
		file.open( log_file.c_str(), std::ios_base::out | std::ios_base::app );
		log_file_open = true;
	}
}


void Log::PrintDate(const PT::Date & date, size_t time_zone_id)
{
	if( time_zones )
	{
		TimeZone * tz = time_zones->GetZone(time_zone_id);

		if( tz )
		{
			PT::Date local_date = tz->ToLocal(date);
			log << local_date;
		}
		else
		{
			(*this) << date << " UTC"; // unknown time zone identifier
		}
	}
	else
	{
		(*this) << date << " UTC"; // time_zones object was not set
	}
}


	
Log & Log::operator<<(const void * s)
{
	if( current_level > log_level )
		return *this;

    buffer << s;
    return *this;
}



Log & Log::operator<<(const char * s)
{
	if( current_level > log_level )
		return *this;

	if( !s )
		return *this;

	buffer << s;
    
return *this;
}



Log & Log::operator<<(const std::string & s)
{
	if( current_level > log_level )
		return *this;

	buffer << s;
    return *this;
}



Log & Log::operator<<(const std::string * s)
{
	if( current_level > log_level )
		return *this;

	buffer << *s;
    return *this;
}






Log & Log::operator<<(const wchar_t * s)
{
	if( current_level <= log_level )
	{
		if( s )
			buffer << s;
	}
    
return *this;
}



Log & Log::operator<<(const std::wstring & s)
{
	if( current_level <= log_level )
	{
		buffer << s;
	}

    return *this;
}



Log & Log::operator<<(const std::wstring * s)
{
	if( current_level <= log_level )
	{
		buffer << *s;
	}

    return *this;
}





Log & Log::operator<<(int s)
{
	if( current_level <= log_level )
	{
		buffer << s;
	}

    return *this;
}



Log & Log::operator<<(long s)
{
	if( current_level <= log_level )
	{
		buffer << s;
	}

    return *this;
}




Log & Log::operator<<(char s)
{
	if( current_level <= log_level )
	{
		buffer << s;
	}

    return *this;
}


Log & Log::operator<<(wchar_t s)
{
	if( current_level <= log_level )
	{
		buffer << s;
	}

    return *this;
}


Log & Log::operator<<(size_t s)
{
	if( current_level <= log_level )
	{
		buffer << s;
	}

    return *this;
}



Log & Log::operator<<(double s)
{
	if( current_level <= log_level )
	{
		buffer << s;
	}

    return *this;
}



Log & Log::operator<<(const PT::Space & s)
{
	if( current_level <= log_level )
	{
		buffer << s;
	}

return *this;
}



Log & Log::operator<<(const PT::Date & date)
{
	if( current_level <= log_level )
	{
		buffer << date;
	}

return *this;
}



Log & Log::operator<<(LogManipulators m)
{
	switch(m)
	{
	case logend:
		if( current_level <= log_level )
		{
			buffer << '\n';
			lines += 1;

			if( save_each_line )
				SaveLogAndClear();
		}
		break;

	case logsave:
		SaveLogAndClear();
		break;

	case logendrequest:
		if( ++request >= max_requests || lines > max_lines )
			SaveLogAndClear();
		break;
		
	case log1:
		current_level = 1;
		break;
		
	case log2:
		current_level = 2;
		break;
		
	case log3:
		current_level = 3;
		break;

	case log4:
		current_level = 4;
		break;

	default:
		break;
	}

return *this;
}




char Log::GetHEXdigit(unsigned char c)
{
	if( c < 10 )
		return c + '0';

return c - 10 + 'A';
}



void Log::ToHEX(char * buf, unsigned char c)
{
	buf[0] = GetHEXdigit(c >> 4);
	buf[1] = GetHEXdigit(c & 0xf);
	buf[2] = 0;
}


void Log::LogBinary(const char * blob, size_t blob_len)
{
size_t i=0;
char buf[3];


	while( i < blob_len )
	{
		size_t oldi = i;

		for(size_t a=0 ; a<16 ; ++a)
		{
			if( i < blob_len )
			{
				ToHEX(buf, blob[i]);
				buffer << buf << ' ';
				++i;
			}
			else
			{
				buffer << "   ";
			}

			if( a == 7 )
			{
				if( i < blob_len )
					buffer << "- ";
				else
					buffer << "  ";
			}
		}

		i = oldi;
		buffer << ' ';

		for(size_t a=0 ; a<16 && i<blob_len ; ++a, ++i)
		{
			if( blob[i] > 31 && blob[i] < 127 )
				buffer << blob[i];
			else
				buffer << '.';
		}

		(*this) << logend;
	}
}


void Log::LogBinary(const std::string & blob)
{
	LogBinary(blob.c_str(), blob.size());
}


void Log::SystemErr(int err)
{
	(*this) << "errno: " << err;

	const char * err_msg = strerror(err);

	if( err_msg )
		(*this) << " (" << err_msg << ")";
}


void Log::SaveLogAndClear()
{
	SaveLog();

	buffer.Clear();
	request = 0;
	lines   = 0;
}


void Log::SaveLog()
{
	if( buffer.Str().empty() )
		return;

	if( log_stdout )
		PT::WideToUTF8(buffer.Str(), std::cout);

	if( log_file.empty() )
		return;

	if( !log_file_open || !file )
	{
		file.close();
		file.clear();

		OpenFile();

		if( !file )
			return;
	}

	PT::WideToUTF8(buffer.Str(), file);
	file.flush();
}





} // namespace Winix