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#include "qplatformdefs.h"

#include "q3process.h"

#ifndef QT_NO_PROCESS

#include "qapplication.h"

#include "q3cstring.h"

#include "q3ptrqueue.h"

#include "qtimer.h"

#include "qregexp.h"

#include "private/q3membuf_p.h"

#include "qt_windows.h"

#ifdef Q_OS_WINCE

#define STARTF_USESTDHANDLES 1

#endif

QT_BEGIN_NAMESPACE

//#define QT_Q3PROCESS_DEBUG

/***********************************************************************

 *

 * Q3ProcessPrivate

 *

 **********************************************************************/

class Q3ProcessPrivate

{

public:

    Q3ProcessPrivate( Q3Process *proc )

    {

	stdinBufRead = 0;

	pipeStdin[0] = 0;

	pipeStdin[1] = 0;

	pipeStdout[0] = 0;

	pipeStdout[1] = 0;

	pipeStderr[0] = 0;

	pipeStderr[1] = 0;

	exitValuesCalculated = false;

	lookup = new QTimer( proc );

	qApp->connect( lookup, SIGNAL(timeout()),

		proc, SLOT(timeout()) );

	pid = 0;

    }

    ~Q3ProcessPrivate()

    {

	reset();

    }

    void reset()

    {

	while ( !stdinBuf.isEmpty() ) {

	    delete stdinBuf.dequeue();

	}

	closeHandles();

	stdinBufRead = 0;

	pipeStdin[0] = 0;

	pipeStdin[1] = 0;

	pipeStdout[0] = 0;

	pipeStdout[1] = 0;

	pipeStderr[0] = 0;

	pipeStderr[1] = 0;

	exitValuesCalculated = false;

	deletePid();

    }

    void closeHandles()

    {

	if( pipeStdin[1] != 0 ) {

	    CloseHandle( pipeStdin[1] );

	    pipeStdin[1] = 0;

	}

	if( pipeStdout[0] != 0 ) {

	    CloseHandle( pipeStdout[0] );

	    pipeStdout[0] = 0;

	}

	if( pipeStderr[0] != 0 ) {

	    CloseHandle( pipeStderr[0] );

	    pipeStderr[0] = 0;

	}

    }

    void deletePid()

    {

	if ( pid ) {

	    CloseHandle( pid->hProcess );

	    CloseHandle( pid->hThread );

	    delete pid;

	    pid = 0;

	}

    }

    void newPid()

    {

	deletePid();

	pid = new PROCESS_INFORMATION;

	memset( pid, 0, sizeof(PROCESS_INFORMATION) );

    }

    Q3Membuf bufStdout;

    Q3Membuf bufStderr;

    Q3PtrQueue<QByteArray> stdinBuf;

    HANDLE pipeStdin[2];

    HANDLE pipeStdout[2];

    HANDLE pipeStderr[2];

    QTimer *lookup;

    PROCESS_INFORMATION *pid;

    uint stdinBufRead;

    bool exitValuesCalculated;

};

/***********************************************************************

 *

 * Q3Process

 *

 **********************************************************************/

void Q3Process::init()

{

    d = new Q3ProcessPrivate( this );

    exitStat = 0;

    exitNormal = false;

}

void Q3Process::reset()

{

    d->reset();

    exitStat = 0;

    exitNormal = false;

    d->bufStdout.clear();

    d->bufStderr.clear();

}

Q3Membuf* Q3Process::membufStdout()

{

    if( d->pipeStdout[0] != 0 )

	socketRead( 1 );

    return &d->bufStdout;

}

Q3Membuf* Q3Process::membufStderr()

{

    if( d->pipeStderr[0] != 0 )

	socketRead( 2 );

    return &d->bufStderr;

}

Q3Process::~Q3Process()

{

    delete d;

}

bool Q3Process::start( QStringList *env )

{

#if defined(QT_Q3PROCESS_DEBUG)

    qDebug( "Q3Process::start()" );

#endif

    reset();

    if ( _arguments.isEmpty() )

	return false;

    // Open the pipes.  Make non-inheritable copies of input write and output

    // read handles to avoid non-closable handles (this is done by the

    // DuplicateHandle() call).

    SECURITY_ATTRIBUTES secAtt = { sizeof( SECURITY_ATTRIBUTES ), NULL, TRUE };

#ifndef Q_OS_WINCE

    // I guess there is no stdin stdout and stderr on Q_OS_WINCE to dup

    // CreatePipe and DupilcateHandle aren't available for Q_OS_WINCE

    HANDLE tmpStdin, tmpStdout, tmpStderr;

    if ( comms & Stdin ) {

	if ( !CreatePipe( &d->pipeStdin[0], &tmpStdin, &secAtt, 0 ) ) {

	    d->closeHandles();

	    return false;

	}

	if ( !DuplicateHandle( GetCurrentProcess(), tmpStdin, GetCurrentProcess(), &d->pipeStdin[1], 0, FALSE, DUPLICATE_SAME_ACCESS ) ) {

	    d->closeHandles();

	    return false;

	}

	if ( !CloseHandle( tmpStdin ) ) {

	    d->closeHandles();

	    return false;

	}

    }

    if ( comms & Stdout ) {

	if ( !CreatePipe( &tmpStdout, &d->pipeStdout[1], &secAtt, 0 ) ) {

	    d->closeHandles();

	    return false;

	}

	if ( !DuplicateHandle( GetCurrentProcess(), tmpStdout, GetCurrentProcess(), &d->pipeStdout[0], 0, FALSE, DUPLICATE_SAME_ACCESS ) ) {

	    d->closeHandles();

	    return false;

	}

	if ( !CloseHandle( tmpStdout ) ) {

	    d->closeHandles();

	    return false;

	}

    }

    if ( comms & Stderr ) {

	if ( !CreatePipe( &tmpStderr, &d->pipeStderr[1], &secAtt, 0 ) ) {

	    d->closeHandles();

	    return false;

	}

	if ( !DuplicateHandle( GetCurrentProcess(), tmpStderr, GetCurrentProcess(), &d->pipeStderr[0], 0, FALSE, DUPLICATE_SAME_ACCESS ) ) {

	    d->closeHandles();

	    return false;

	}

	if ( !CloseHandle( tmpStderr ) ) {

	    d->closeHandles();

	    return false;

	}

    }

    if ( comms & DupStderr ) {

	CloseHandle( d->pipeStderr[1] );

	d->pipeStderr[1] = d->pipeStdout[1];

    }

#endif

    // construct the arguments for CreateProcess()

    QString args;

    QString appName;

    QStringList::Iterator it = _arguments.begin();

    args = *it;

    ++it;

    if ( args.endsWith( QLatin1String(".bat") ) && args.contains( QLatin1Char(' ') ) ) {

	// CreateProcess() seems to have a strange semantics (see also

	// http://www.experts-exchange.com/Programming/Programming_Platforms/Win_Prog/Q_11138647.html):

	// If you start a batch file with spaces in the filename, the first

	// argument to CreateProcess() must be the name of the batchfile

	// without quotes, but the second argument must start with the same

	// argument with quotes included. But if the same approach is used for

	// .exe files, it doesn't work.

	appName = args;

	args = QLatin1Char('"') + args + QLatin1Char('"');

    }

    for ( ; it != _arguments.end(); ++it ) {

	QString tmp = *it;

	// escape a single " because the arguments will be parsed

	tmp.replace( QLatin1Char('\"'), QLatin1String("\\\"") );

	if ( tmp.isEmpty() || tmp.contains( QLatin1Char(' ') ) || tmp.contains( QLatin1Char('\t') ) ) {

	    // The argument must not end with a \ since this would be interpreted

	    // as escaping the quote -- rather put the \ behind the quote: e.g.

	    // rather use "foo"\ than "foo\"

	    QString endQuote( QLatin1String("\"") );

	    int i = tmp.length();

	    while ( i>0 && tmp.at( i-1 ) == QLatin1Char('\\') ) {

		--i;

		endQuote += QLatin1Char('\\');

	    }

        args += QLatin1String(" \"") + tmp.left( i ) + endQuote;

	} else {

	    args += QLatin1Char(' ') + tmp;

	}

    }

#if defined(QT_Q3PROCESS_DEBUG)

    qDebug( "Q3Process::start(): args [%s]", args.latin1() );

#endif

    // CreateProcess()

    bool success;

    d->newPid();

    STARTUPINFOW startupInfo = {

        sizeof( STARTUPINFO ), 0, 0, 0,

        (ulong)CW_USEDEFAULT, (ulong)CW_USEDEFAULT, (ulong)CW_USEDEFAULT, (ulong)CW_USEDEFAULT,

        0, 0, 0,

        STARTF_USESTDHANDLES,

        0, 0, 0,

        d->pipeStdin[0], d->pipeStdout[1], d->pipeStderr[1]

    };

    wchar_t *applicationName;

    if ( appName.isNull() )

        applicationName = 0;

    else

        applicationName = _wcsdup( (wchar_t*)appName.utf16() );

    wchar_t *commandLine = _wcsdup( (wchar_t*)args.utf16() );

    QByteArray envlist;

    if ( env != 0 ) {

        int pos = 0;

        // add PATH if necessary (for DLL loading)

        QByteArray path = qgetenv( "PATH" );

        if ( env->grep( QRegExp(QLatin1String("^PATH="),FALSE) ).empty() && !path.isNull() ) {

            QString tmp = QString::fromLatin1("PATH=%1").arg(QLatin1String(path.constData()));

            uint tmpSize = sizeof(wchar_t) * (tmp.length() + 1);

            envlist.resize( envlist.size() + tmpSize );

            memcpy( envlist.data() + pos, tmp.utf16(), tmpSize );

            pos += tmpSize;

        }

        // add the user environment

        for ( QStringList::Iterator it = env->begin(); it != env->end(); it++ ) {

            QString tmp = *it;

            uint tmpSize = sizeof(wchar_t) * (tmp.length() + 1);

            envlist.resize( envlist.size() + tmpSize );

            memcpy( envlist.data() + pos, tmp.utf16(), tmpSize );

            pos += tmpSize;

        }

        // add the 2 terminating 0 (actually 4, just to be on the safe side)

        envlist.resize( envlist.size()+4 );

        envlist[pos++] = 0;

        envlist[pos++] = 0;

        envlist[pos++] = 0;

        envlist[pos++] = 0;

    }

    success = CreateProcess( applicationName, commandLine,

                            0, 0, TRUE, ( comms == 0 ? CREATE_NEW_CONSOLE : CREATE_NO_WINDOW )

#ifndef Q_OS_WINCE

                            | CREATE_UNICODE_ENVIRONMENT

#endif

                            , env == 0 ? 0 : envlist.data(),

                            (wchar_t*)QDir::toNativeSeparators(workingDir.absPath()).utf16(),

                            &startupInfo, d->pid );

    free( applicationName );

    free( commandLine );

    if  ( !success ) {

	d->deletePid();

	return false;

    }

#ifndef Q_OS_WINCE

    if ( comms & Stdin )

	CloseHandle( d->pipeStdin[0] );

    if ( comms & Stdout )

        CloseHandle( d->pipeStdout[1] );

    if ( (comms & Stderr) && !(comms & DupStderr) )

	CloseHandle( d->pipeStderr[1] );

#endif

    if ( ioRedirection || notifyOnExit ) {

	d->lookup->start( 100 );

    }

    // cleanup and return

    return true;

}

static BOOL CALLBACK qt_terminateApp( HWND hwnd, LPARAM procId )

{

    DWORD procId_win;

    GetWindowThreadProcessId( hwnd, &procId_win );

    if( procId_win == (DWORD)procId )

	PostMessage( hwnd, WM_CLOSE, 0, 0 );

    return TRUE;

}

void Q3Process::tryTerminate() const

{

    if ( d->pid )

	EnumWindows( qt_terminateApp, (LPARAM)d->pid->dwProcessId );

}

void Q3Process::kill() const

{

    if ( d->pid )

	TerminateProcess( d->pid->hProcess, 0xf291 );

}

bool Q3Process::isRunning() const

{

    if ( !d->pid )

	return false;

    if ( WaitForSingleObject( d->pid->hProcess, 0) == WAIT_OBJECT_0 ) {

	// there might be data to read

	Q3Process *that = (Q3Process*)this;

	that->socketRead( 1 ); // try stdout

	that->socketRead( 2 ); // try stderr

	// compute the exit values

	if ( !d->exitValuesCalculated ) {

	    DWORD exitCode;

	    if ( GetExitCodeProcess( d->pid->hProcess, &exitCode ) ) {

		if ( exitCode != STILL_ACTIVE ) { // this should ever be true?

		    that->exitNormal = exitCode != 0xf291;

		    that->exitStat = exitCode;

		}

	    }

	    d->exitValuesCalculated = true;

	}

	d->deletePid();

	d->closeHandles();

	return false;

    } else {

        return true;

    }

}

bool Q3Process::canReadLineStdout() const

{

    if( !d->pipeStdout[0] )

	return d->bufStdout.size() != 0;

    Q3Process *that = (Q3Process*)this;

    return that->membufStdout()->scanNewline( 0 );

}

bool Q3Process::canReadLineStderr() const

{

    if( !d->pipeStderr[0] )

	return d->bufStderr.size() != 0;

    Q3Process *that = (Q3Process*)this;

    return that->membufStderr()->scanNewline( 0 );

}

void Q3Process::writeToStdin( const QByteArray& buf )

{

    d->stdinBuf.enqueue( new QByteArray(buf) );

    socketWrite( 0 );

}

void Q3Process::closeStdin( )

{

    if ( d->pipeStdin[1] != 0 ) {

	CloseHandle( d->pipeStdin[1] );

	d->pipeStdin[1] = 0;

    }

}

void Q3Process::socketRead( int fd )

{

    // fd == 1: stdout, fd == 2: stderr

    HANDLE dev;

    if ( fd == 1 ) {

	dev = d->pipeStdout[0];

    } else if ( fd == 2 ) {

	dev = d->pipeStderr[0];

    } else {

	return;

    }

#ifndef Q_OS_WINCE

    // get the number of bytes that are waiting to be read

    unsigned long i, r;

    char dummy;

    if ( !PeekNamedPipe( dev, &dummy, 1, &r, &i, 0 ) ) {

	return; // ### is it worth to dig for the reason of the error?

    }

#else

    unsigned long i = 1000;

#endif

    if ( i > 0 ) {

	Q3Membuf *buffer;

	if ( fd == 1 )

	    buffer = &d->bufStdout;

	else

	    buffer = &d->bufStderr;

	QByteArray *ba = new QByteArray( i );

	uint sz = readStddev( dev, ba->data(), i );

	if ( sz != i )

	    ba->resize( i );

	if ( sz == 0 ) {

	    delete ba;

	    return;

	}

	buffer->append( ba );

	if ( fd == 1 )

	    emit readyReadStdout();

	else

	    emit readyReadStderr();

    }

}

void Q3Process::socketWrite( int )

{

    DWORD written;

    while ( !d->stdinBuf.isEmpty() && isRunning() ) {

	if ( !WriteFile( d->pipeStdin[1],

		    d->stdinBuf.head()->data() + d->stdinBufRead,

		    qMin( 8192, int(d->stdinBuf.head()->size() - d->stdinBufRead) ),

		    &written, 0 ) ) {

	    d->lookup->start( 100 );

	    return;

	}

	d->stdinBufRead += written;

	if ( d->stdinBufRead == (DWORD)d->stdinBuf.head()->size() ) {

	    d->stdinBufRead = 0;