/**************************************************************
 * 
 * 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_vcl.hxx"

#include <string.h>
#include <stdio.h>
#include <stdlib.h>

#include "osl/module.hxx"
#include "tools/solarmutex.hxx"
#include "vos/mutex.hxx"


#include "unx/salunx.h"
#include "unx/saldata.hxx"
#include "unx/saldisp.hxx"
#include "unx/salinst.h"
#include "unx/salframe.h"
#include "unx/dtint.hxx"
#include "unx/salprn.h"
#include "unx/sm.hxx"

#include "vcl/apptypes.hxx"
#include "vcl/helper.hxx"

#include "salwtype.hxx"

// -------------------------------------------------------------------------
//
// SalYieldMutex
//
// -------------------------------------------------------------------------

SalYieldMutex::SalYieldMutex()
{
	mnCount 	= 0;
	mnThreadId	= 0;
	::tools::SolarMutex::SetSolarMutex( this );
}

void SalYieldMutex::acquire()
{
	OMutex::acquire();
	mnThreadId = vos::OThread::getCurrentIdentifier();
	mnCount++;
}

void SalYieldMutex::release()
{
	if ( mnThreadId == vos::OThread::getCurrentIdentifier() )
	{
		if ( mnCount == 1 )
			mnThreadId = 0;
		mnCount--;
	}
	OMutex::release();
}

sal_Bool SalYieldMutex::tryToAcquire()
{
	if ( OMutex::tryToAcquire() )
	{
		mnThreadId = vos::OThread::getCurrentIdentifier();
		mnCount++;
		return True;
	}
	else
		return False;
}

//----------------------------------------------------------------------------

// -=-= SalInstance =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
// -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

// plugin factory function
extern "C"
{
    VCLPLUG_GEN_PUBLIC SalInstance* create_SalInstance()
    {
        /* #i92121# workaround deadlocks in the X11 implementation
        */
        static const char* pNoXInitThreads = getenv( "SAL_NO_XINITTHREADS" );
        /* #i90094#
           from now on we know that an X connection will be
           established, so protect X against itself
        */
        if( ! ( pNoXInitThreads && *pNoXInitThreads ) )
            XInitThreads();
        
        X11SalInstance* pInstance = new X11SalInstance( new SalYieldMutex() );

        // initialize SalData
        X11SalData *pSalData = new X11SalData;
        SetSalData( pSalData );
        pSalData->m_pInstance = pInstance;
        pSalData->Init();

        return pInstance;
    }
}

X11SalInstance::~X11SalInstance()
{
    // close session management
    SessionManagerClient::close();

    // dispose SalDisplay list from SalData
    // would be done in a static destructor else which is
    // a little late

	X11SalData *pSalData = GetX11SalData();
    pSalData->deInitNWF();
	delete pSalData;
	SetSalData( NULL );

	::tools::SolarMutex::SetSolarMutex( 0 );
  	delete mpSalYieldMutex;
}


// --------------------------------------------------------
// AnyInput from sv/mow/source/app/svapp.cxx

struct PredicateReturn
{
	sal_uInt16	nType;
	sal_Bool	bRet;
};

extern "C" {
Bool ImplPredicateEvent( Display *, XEvent *pEvent, char *pData )
{
	PredicateReturn *pPre = (PredicateReturn *)pData;

	if ( pPre->bRet )
		return False;

	sal_uInt16 nType;

	switch( pEvent->type )
	{
		case ButtonPress:
		case ButtonRelease:
		case MotionNotify:
		case EnterNotify:
		case LeaveNotify:
			nType = INPUT_MOUSE;
			break;

		case XLIB_KeyPress:
		//case KeyRelease:
			nType = INPUT_KEYBOARD;
			break;
		case Expose:
		case GraphicsExpose:
		case NoExpose:
			nType = INPUT_PAINT;
			break;
		default:
			nType = 0;
	}

	if ( (nType & pPre->nType) || ( ! nType && (pPre->nType & INPUT_OTHER) ) )
		pPre->bRet = sal_True;

	return False;
}
}

bool X11SalInstance::AnyInput(sal_uInt16 nType)
{
	X11SalData *pSalData = GetX11SalData();
	Display *pDisplay  = pSalData->GetDisplay()->GetDisplay();
    sal_Bool bRet = sal_False;

    if( (nType & INPUT_TIMER) &&
        pSalData->GetDisplay()->GetXLib()->CheckTimeout( false ) )
    {
        bRet = sal_True;
    }
	else if (XPending(pDisplay) )
	{
        PredicateReturn aInput;
        XEvent			aEvent;

        aInput.bRet 	= sal_False;
        aInput.nType	= nType;

        XCheckIfEvent(pDisplay, &aEvent, ImplPredicateEvent,
                      (char *)&aInput );

        bRet = aInput.bRet;
	}
	return bRet;
}

vos::IMutex* X11SalInstance::GetYieldMutex()
{
	return mpSalYieldMutex;
}

// -----------------------------------------------------------------------

sal_uLong X11SalInstance::ReleaseYieldMutex()
{
	SalYieldMutex* pYieldMutex = mpSalYieldMutex;
	if ( pYieldMutex->GetThreadId() ==
		 vos::OThread::getCurrentIdentifier() )
	{
		sal_uLong nCount = pYieldMutex->GetAcquireCount();
		sal_uLong n = nCount;
		while ( n )
		{
			pYieldMutex->release();
			n--;
		}

		return nCount;
	}
	else
		return 0;
}

// -----------------------------------------------------------------------

void X11SalInstance::AcquireYieldMutex( sal_uLong nCount )
{
	SalYieldMutex* pYieldMutex = mpSalYieldMutex;
	while ( nCount )
	{
		pYieldMutex->acquire();
		nCount--;
	}
}

// -----------------------------------------------------------------------

bool X11SalInstance::CheckYieldMutex()
{
    bool bRet = true;

	SalYieldMutex* pYieldMutex = mpSalYieldMutex;
	if ( pYieldMutex->GetThreadId() !=
		 vos::OThread::getCurrentIdentifier() )
	{
	    bRet = false;
	}
    
    return bRet;
}

// -----------------------------------------------------------------------

void X11SalInstance::Yield( bool bWait, bool bHandleAllCurrentEvents )
{ GetX11SalData()->GetLib()->Yield( bWait, bHandleAllCurrentEvents ); }

void* X11SalInstance::GetConnectionIdentifier( ConnectionIdentifierType& rReturnedType, int& rReturnedBytes )
{
	static const char* pDisplay = getenv( "DISPLAY" );
	rReturnedType	= AsciiCString;
	rReturnedBytes	= pDisplay ? strlen( pDisplay )+1 : 1;
	return pDisplay ? (void*)pDisplay : (void*)"";
}

SalFrame *X11SalInstance::CreateFrame( SalFrame *pParent, sal_uLong nSalFrameStyle )
{
	SalFrame *pFrame = new X11SalFrame( pParent, nSalFrameStyle );

	return pFrame;
}

SalFrame* X11SalInstance::CreateChildFrame( SystemParentData* pParentData, sal_uLong nStyle )
{
	SalFrame* pFrame = new X11SalFrame( NULL, nStyle, pParentData );

	return pFrame;
}

void X11SalInstance::DestroyFrame( SalFrame* pFrame )
{
	delete pFrame;
}

static void getServerDirectories( std::list< rtl::OString >& o_rFontPaths )
{
#ifdef LINUX
    /*
     *  chkfontpath exists on some (RH derived) Linux distributions
     */
    static const char* pCommands[] = {
        "/usr/sbin/chkfontpath 2>/dev/null", "chkfontpath 2>/dev/null"
    };
    ::std::list< ByteString > aLines;

    for( unsigned int i = 0; i < sizeof(pCommands)/sizeof(pCommands[0]); i++ )
    {
        FILE* pPipe = popen( pCommands[i], "r" );
        aLines.clear();
        if( pPipe )
        {
            char line[1024];
            char* pSearch;
            while( fgets( line, sizeof(line), pPipe ) )
            {
                int nLen = strlen( line );
                if( line[nLen-1] == '\n' )
                    line[nLen-1] = 0;
                pSearch = strstr( line, ": " );
                if( pSearch )
                    aLines.push_back( pSearch+2 );
            }
            if( ! pclose( pPipe ) )
                break;
        }
    }

    for( ::std::list< ByteString >::iterator it = aLines.begin(); it != aLines.end(); ++it )
    {
        if( ! access( it->GetBuffer(), F_OK ) )
        {
            o_rFontPaths.push_back( *it );
#if OSL_DEBUG_LEVEL > 1
            fprintf( stderr, "adding fs dir %s\n", it->GetBuffer() );
#endif
        }
    }
#else
    (void)o_rFontPaths;
#endif
}



void X11SalInstance::FillFontPathList( std::list< rtl::OString >& o_rFontPaths )
{
    Display *pDisplay = GetX11SalData()->GetDisplay()->GetDisplay();
    
    DBG_ASSERT( pDisplay, "No Display !" );
    if( pDisplay )
    {
        // get font paths to look for fonts
        int nPaths = 0, i;
        char** pPaths = XGetFontPath( pDisplay, &nPaths );
        
        bool bServerDirs = false;
        for( i = 0; i < nPaths; i++ )
        {
            OString aPath( pPaths[i] );
            sal_Int32 nPos = 0;
            if( ! bServerDirs
                && ( nPos = aPath.indexOf( ':' ) ) > 0
                && ( !aPath.copy(nPos).equals( ":unscaled" ) ) )
            {
                bServerDirs = true;
                getServerDirectories( o_rFontPaths );
            }
            else
            {
                psp::normPath( aPath );
                o_rFontPaths.push_back( aPath );
            }
        }
        
        if( nPaths )
            XFreeFontPath( pPaths );
    }
    
    // insert some standard directories
    o_rFontPaths.push_back( "/usr/openwin/lib/X11/fonts/TrueType" );
    o_rFontPaths.push_back( "/usr/openwin/lib/X11/fonts/Type1" );
    o_rFontPaths.push_back( "/usr/openwin/lib/X11/fonts/Type1/sun" );
    o_rFontPaths.push_back( "/usr/X11R6/lib/X11/fonts/truetype" );
    o_rFontPaths.push_back( "/usr/X11R6/lib/X11/fonts/Type1" );
    
    #ifdef SOLARIS
    /* cde specials, from /usr/dt/bin/Xsession: here are the good fonts,
    the OWfontpath file may contain as well multiple lines as a comma
    separated list of fonts in each line. to make it even more weird
    environment variables are allowed as well */
    
    const char* lang = getenv("LANG");
    if ( lang != NULL )
    {
        String aOpenWinDir( String::CreateFromAscii( "/usr/openwin/lib/locale/" ) );
        aOpenWinDir.AppendAscii( lang );
        aOpenWinDir.AppendAscii( "/OWfontpath" );
        
        SvFileStream aStream( aOpenWinDir, STREAM_READ );
        
        // TODO: replace environment variables
        while( aStream.IsOpen() && ! aStream.IsEof() )
        {
            ByteString aLine;
            aStream.ReadLine( aLine );
            // need an OString for normpath
            OString aNLine( aLine );
            psp::normPath( aNLine );
            aLine = aNLine;
            // try to avoid bad fonts in some cases
            static bool bAvoid = (strncasecmp( lang, "ar", 2 ) == 0) || (strncasecmp( lang, "he", 2 ) == 0) || strncasecmp( lang, "iw", 2 ) == 0 || (strncasecmp( lang, "hi", 2 ) == 0);
            if( bAvoid && aLine.Search( "iso_8859" ) != STRING_NOTFOUND )
                continue;
            o_rFontPaths.push_back( aLine );
        }
    }
    #endif /* SOLARIS */
}

extern "C" { static void SAL_CALL thisModule() {} }

void X11SalInstance::AddToRecentDocumentList(const rtl::OUString& rFileUrl, const rtl::OUString& rMimeType)
{
    const rtl::OUString SYM_ADD_TO_RECENTLY_USED_FILE_LIST(RTL_CONSTASCII_USTRINGPARAM("add_to_recently_used_file_list"));
    const rtl::OUString LIB_RECENT_FILE(RTL_CONSTASCII_USTRINGPARAM("librecentfile.so"));
    typedef void (*PFUNC_ADD_TO_RECENTLY_USED_LIST)(const rtl::OUString&, const rtl::OUString&);

    PFUNC_ADD_TO_RECENTLY_USED_LIST add_to_recently_used_file_list = 0;

    osl::Module module;
    module.loadRelative( &thisModule, LIB_RECENT_FILE );
    if (module.is())
        add_to_recently_used_file_list = (PFUNC_ADD_TO_RECENTLY_USED_LIST)module.getFunctionSymbol(SYM_ADD_TO_RECENTLY_USED_FILE_LIST);
    if (add_to_recently_used_file_list)
        add_to_recently_used_file_list(rFileUrl, rMimeType);
}