/**************************************************************
 * 
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * 
 *************************************************************/


// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_sal.hxx"
#include <cstdarg>
#include <cstdio>
#include <stdio.h>
#include <stdarg.h>

#include <rtl/logfile.h>
#include <osl/process.h>
#ifndef _OSL_FILE_H_
#include <osl/time.h>
#endif
#include <osl/time.h>
#include <osl/mutex.hxx>
#include <rtl/bootstrap.h>
#include <rtl/ustring.hxx>
#ifndef _RTL_STRBUF_HXX_
#include <rtl/ustrbuf.hxx>
#endif
#include <rtl/alloc.h>
#include "osl/thread.h"

#include <algorithm>

#ifdef _MSC_VER
#define vsnprintf _vsnprintf
#endif

using namespace rtl;
using namespace osl;
using namespace std;

namespace {

static oslFileHandle g_aFile = 0;
static sal_Bool g_bHasBeenCalled = sal_False;
static const sal_Int32 g_BUFFERSIZE = 4096;
static sal_Char *g_buffer = 0;	
	
class	LoggerGuard
{
public:
	~LoggerGuard();
};

LoggerGuard::~LoggerGuard()
{
	if( g_buffer )
	{
		sal_Int64 nWritten, nConverted =
			sprintf( g_buffer, "closing log file at %06" SAL_PRIuUINT32, osl_getGlobalTimer() );
		if( nConverted > 0 )
			osl_writeFile( g_aFile, g_buffer, nConverted, (sal_uInt64 *)&nWritten );
		osl_closeFile( g_aFile );
		g_aFile = 0;
		
		rtl_freeMemory( g_buffer );
		g_buffer = 0;
		g_bHasBeenCalled = sal_False;
	}
}

// The destructor of this static LoggerGuard is "activated" by the assignment to
// g_buffer in init():
LoggerGuard loggerGuard;

Mutex & getLogMutex()
{
	static Mutex *pMutex = 0;
	if( !pMutex )
	{
		MutexGuard guard( Mutex::getGlobalMutex() );
		if( ! pMutex )
		{
			static Mutex mutex;
			pMutex = &mutex;
		}
	}
	return *pMutex;
}

OUString getFileUrl( const OUString &name )
{
	OUString aRet;
	if ( osl_getFileURLFromSystemPath( name.pData, &aRet.pData )
         != osl_File_E_None )
    {
        OSL_ASSERT( false );
    }

	OUString aWorkingDirectory;
	osl_getProcessWorkingDir( &(aWorkingDirectory.pData) );
	osl_getAbsoluteFileURL( aWorkingDirectory.pData, aRet.pData, &(aRet.pData) );

	return aRet;
}

void init() {
	if( !g_bHasBeenCalled )
	{
		MutexGuard guard( getLogMutex() );
		if( ! g_bHasBeenCalled )
		{
			OUString name( RTL_CONSTASCII_USTRINGPARAM( "RTL_LOGFILE" ) );
			OUString value;
			if( rtl_bootstrap_get( name.pData, &value.pData, 0 ) )
			{
				//	Obtain process id.
				oslProcessIdentifier aProcessId = 0;
				oslProcessInfo info;
				info.Size = sizeof (oslProcessInfo);
				if (osl_getProcessInfo (0, osl_Process_IDENTIFIER, &info) == osl_Process_E_None)
					aProcessId = info.Ident;
				
				//	Construct name of log file and open the file.
				OUStringBuffer buf( 128 );
				buf.append( value );
				
				// if the filename ends with .nopid, the incoming filename is not modified
				if( value.getLength() < 6 /* ".nopid" */ ||
					rtl_ustr_ascii_compare_WithLength(
						value.getStr() + (value.getLength()-6) , 6 , ".nopid" ) )
				{
					buf.appendAscii( "_" );
					buf.append( (sal_Int32) aProcessId );
					buf.appendAscii( ".log" );
				}

				OUString o = getFileUrl( buf.makeStringAndClear() );
				oslFileError e = osl_openFile(
					o.pData, &g_aFile, osl_File_OpenFlag_Write|osl_File_OpenFlag_Create);

				if( osl_File_E_None == e )
				{
					TimeValue aCurrentTime;
					g_buffer = ( sal_Char * ) rtl_allocateMemory( g_BUFFERSIZE );
					sal_Int64 nConverted = 0;
					if (osl_getSystemTime (&aCurrentTime))
					{
						nConverted = (sal_Int64 ) sprintf (
								g_buffer,
								"opening log file %f seconds past January 1st 1970\n"
								"corresponding to %" SAL_PRIuUINT32 " ms after timer start\n",
								aCurrentTime.Seconds + 1e-9 * aCurrentTime.Nanosec,
								osl_getGlobalTimer());

						if( nConverted > 0 )
                        {
                            sal_Int64 nWritten;
							osl_writeFile( g_aFile, g_buffer, nConverted , (sal_uInt64 *)&nWritten );
                        }
					}
					
					nConverted = sprintf (g_buffer, "Process id is %" SAL_PRIuUINT32 "\n", aProcessId);
					if( nConverted )
                    {
                        sal_Int64 nWritten;
						osl_writeFile( g_aFile, g_buffer, nConverted, (sal_uInt64 *)&nWritten );
                    }
				}
				else
				{
					OSL_TRACE( "Couldn't open logfile %s(%d)" , o.getStr(), e );
				}
			}
			g_bHasBeenCalled = sal_True;
		}
	}
}

}

extern "C" void	SAL_CALL rtl_logfile_trace	( const char *pszFormat, ... )
{
	init();
	if( g_buffer )
	{
		va_list args;
		va_start(args, pszFormat);
		{
			sal_Int64 nConverted, nWritten;
			MutexGuard guard( getLogMutex() );
			nConverted = vsnprintf( g_buffer , g_BUFFERSIZE, pszFormat, args );
			nConverted = (nConverted > g_BUFFERSIZE ? g_BUFFERSIZE : nConverted );
			if( nConverted > 0 )
				osl_writeFile( g_aFile, g_buffer, nConverted, (sal_uInt64*)&nWritten );
		}
		va_end(args);
	}
}

extern "C" void SAL_CALL rtl_logfile_longTrace(char const * format, ...) {
    init();
    if (g_buffer != 0) {
        sal_uInt32 time = osl_getGlobalTimer();
        oslThreadIdentifier threadId = osl_getThreadIdentifier(0);
        va_list args;
        va_start(args, format);
        {
            MutexGuard g(getLogMutex());
            int n1 = snprintf(
                g_buffer, g_BUFFERSIZE, "%06" SAL_PRIuUINT32 " %" SAL_PRIuUINT32 " ", time, threadId);
            if (n1 >= 0) {
                sal_uInt64 n2;
                osl_writeFile(
                    g_aFile, g_buffer,
                    static_cast< sal_uInt64 >(
                        std::min(n1, static_cast< int >(g_BUFFERSIZE))),
                    &n2);
                n1 = vsnprintf(g_buffer, g_BUFFERSIZE, format, args);
                if (n1 > 0) {
                    osl_writeFile(
                        g_aFile, g_buffer,
                        static_cast< sal_uInt64 >(
                            std::min(n1, static_cast< int >(g_BUFFERSIZE))),
                        &n2);
                }
            }
        }
        va_end(args);
    }
}

extern "C" sal_Bool SAL_CALL rtl_logfile_hasLogFile( void ) {
	init();
    return g_buffer != 0;
}