/**********************************************************************
** Copyright (C) 2000 Trolltech AS.  All rights reserved.
**
** This file is part of Qtopia Environment.
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
** See http://www.trolltech.com/gpl/ for GPL licensing information.
**
** Contact info@trolltech.com if any conditions of this licensing are
** not clear to you.
**
**********************************************************************/

#include <qdir.h>
#include <qmessagebox.h>
#if QT_VERSION <= 230 && defined(QT_NO_CODECS)
#include <qtextcodec.h>
#endif
#include <qtextstream.h>

#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>

#define QTOPIA_INTERNAL_LANGLIST
#include "kateconfig.h"
#include <qpe/global.h>


/*!
  \internal
*/
QString KateConfig::configFilename(const QString& name, Domain d)
{
    switch (d) {
	case File:
	    return name;
	case User: {
	    QDir dir = (QString(getenv("HOME")) + "/Settings");
	    if ( !dir.exists() )
		mkdir(dir.path().local8Bit(),0700);
	    return dir.path() + "/" + name + ".conf";
	}
    }
    return name;
}

/*!
  \class KateConfig config.h
  \brief The KateConfig class provides for saving application cofniguration state.

  You should keep a KateConfig in existence only while you do not want others
  to be able to change the state. There is no locking currently, but there
  may be in the future.
*/

/*!
  \enum KateConfig::KateConfigGroup
  \internal
*/

/*!
  \enum KateConfig::Domain

  \value File
  \value User

  See KateConfig for details.
*/

/*!
  Constructs a config that will load or create a configuration with the
  given \a name in the given \a domain.

  You must call setGroup() before doing much else with the KateConfig.

  In the default Domain, \e User,
  the configuration is user-specific. \a name should not contain "/" in
  this case, and in general should be the name of the C++ class that is
  primarily responsible for maintaining the configuration.

  In the File Domain, \a name is an absolute filename.
*/
KateConfig::KateConfig( const QString &name, Domain domain )
    : filename( configFilename(name,domain) )
{
    qWarning("KateConfig constructor\n");
    git = groups.end();
    read();
    QStringList l = Global::languageList();
    lang = l[0];
    glang = l[1];
}


// Sharp ROM compatibility
KateConfig::KateConfig ( const QString &name, bool what )
	: filename( configFilename(name,what ? User : File) )
{
    git = groups.end();
    read();
    QStringList l = Global::languageList();
    lang = l[0];
    glang = l[1];
}

/*!
  Writes any changes to disk and destroys the in-memory object.
*/
KateConfig::~KateConfig()
{
    qWarning("KateConfig destructor\n");
    if ( changed )
	write();
}

/*!
  Returns whether the current group has an entry called \a key.
*/
bool KateConfig::hasKey( const QString &key ) const
{
    if ( groups.end() == git )
	return FALSE;
    KateConfigGroup::ConstIterator it = ( *git ).find( key );
    return it != ( *git ).end();
}

/*!
  Sets the current group for subsequent reading and writing of
  entries to \a gname. Grouping allows the application to partition the namespace.

  This function must be called prior to any reading or writing
  of entries.

  The \a gname must not be empty.
*/
void KateConfig::setGroup( const QString &gname )
{
    QMap< QString, KateConfigGroup>::Iterator it = groups.find( gname );
    if ( it == groups.end() ) {
	git = groups.insert( gname, KateConfigGroup() );
	changed = TRUE;
	return;
    }
    git = it;
}

/*!
  Writes a (\a key, \a value) entry to the current group.

  \sa readEntry()
*/
void KateConfig::writeEntry( const QString &key, const char* value )
{
    writeEntry(key,QString(value));
}

/*!
  Writes a (\a key, \a value) entry to the current group.

  \sa readEntry()
*/
void KateConfig::writeEntry( const QString &key, const QString &value )
{
    if ( git == groups.end() ) {
	qWarning( "no group set" );
	return;
    }
    if ( (*git)[key] != value ) {
	( *git ).insert( key, value );
	changed = TRUE;
    }
}

/*
  Note that the degree of protection offered by the encryption here is
  only sufficient to avoid the most casual observation of the configuration
  files. People with access to the files can write down the contents and
  decrypt it using this source code.

  Conceivably, and at some burden to the user, this encryption could
  be improved.
*/
static QString encipher(const QString& plain)
{
    // mainly, we make it long
    QString cipher;
    int mix=28730492;
    for (int i=0; i<(int)plain.length(); i++) {
	int u = plain[i].unicode();
	int c = u ^ mix;
	QString x = QString::number(c,36);
	cipher.append(QChar('a'+x.length()));
	cipher.append(x);
	mix *= u;
    }
    return cipher;
}

static QString decipher(const QString& cipher)
{
    QString plain;
    int mix=28730492;
    for (int i=0; i<(int)cipher.length();) {
	int l = cipher[i].unicode()-'a';
	QString x = cipher.mid(i+1,l); i+=l+1;
	int u = x.toInt(0,36) ^ mix;
	plain.append(QChar(u));
	mix *= u;
    }
    return plain;
}

/*!
  Writes an encrypted (\a key, \a value) entry to the current group.

  Note that the degree of protection offered by the encryption is
  only sufficient to avoid the most casual observation of the configuration
  files.

  \sa readEntry()
*/
void KateConfig::writeEntryCrypt( const QString &key, const QString &value )
{
    if ( git == groups.end() ) {
	qWarning( "no group set" );
	return;
    }
    QString evalue = encipher(value);
    if ( (*git)[key] != evalue ) {
	( *git ).insert( key, evalue );
	changed = TRUE;
    }
}

/*!
  Writes a (\a key, \a num) entry to the current group.

  \sa readNumEntry()
*/
void KateConfig::writeEntry( const QString &key, int num )
{
    QString s;
    s.setNum( num );
    writeEntry( key, s );
}

void KateConfig::writeEntry( const QString &key, unsigned int num )
{
    QString s;
    s.setNum( num );
    writeEntry( key, s );
}

#ifdef Q_HAS_BOOL_TYPE
/*!
  Writes a (\a key, \a b) entry to the current group. This is equivalent
  to writing a 0 or 1 as an integer entry.

  \sa readBoolEntry()
*/
void KateConfig::writeEntry( const QString &key, bool b )
{
    QString s;
    s.setNum( ( int )b );
    writeEntry( key, s );
}
#endif

/*!
  Writes a (\a key, \a lst) entry to the current group. The list
  is separated by \a sep, so the strings must not contain that character.

  \sa readListEntry()
*/
void KateConfig::writeEntry( const QString &key, const QStringList &lst, const QChar &sep )
{
    QString s;
    QStringList::ConstIterator it = lst.begin();
    for ( ; it != lst.end(); ++it )
	s += *it + sep;
    writeEntry( key, s );
}

void KateConfig::writeEntry( const QString &key, const QColor &val )
{
    QStringList l;
    l.append( QString().setNum(val.red()) );
    l.append( QString().setNum(val.green()) );
    l.append( QString().setNum(val.blue()) );
    
    writeEntry( key, l, QChar(',') );
}

void KateConfig::writeEntry( const QString &key, const QFont &val )
{
    QStringList l;
    l.append( val.family() );
    l.append( QString().setNum(val.pointSize()) );
    l.append( QString().setNum(val.weight()) );
    l.append( QString().setNum((int)val.italic()) );
    l.append( QString().setNum((int)val.charSet()) );
    
    writeEntry( key, l, QChar(',') );
}

/*!
  Removes the \a key entry from the current group. Does nothing if
  there is no such entry.
*/

void KateConfig::removeEntry( const QString &key )
{
    if ( git == groups.end() ) {
	qWarning( "no group set" );
	return;
    }
    ( *git ).remove( key );
    changed = TRUE;
}

/*!
  \fn bool KateConfig::operator == ( const KateConfig & other ) const

  Tests for equality with \a other. KateConfig objects are equal if they refer to the same filename.
*/

/*!
  \fn bool KateConfig::operator != ( const KateConfig & other ) const

  Tests for inequality with \a other. KateConfig objects are equal if they refer to the same filename.
*/

/*!
  \fn QString KateConfig::readEntry( const QString &key, const QString &deflt ) const

  Reads a string entry stored with \a key, defaulting to \a deflt if there is no entry.
*/

/*!
  \internal
  For compatibility, non-const version.
*/
QString KateConfig::readEntry( const QString &key, const QString &deflt )
{
    QString res = readEntryDirect( key+"["+lang+"]" );
    if ( !res.isNull() )
	return res;
    if ( !glang.isEmpty() ) {
	res = readEntryDirect( key+"["+glang+"]" );
	if ( !res.isNull() )
	    return res;
    }
    return readEntryDirect( key, deflt );
}

/*!
  \fn QString KateConfig::readEntryCrypt( const QString &key, const QString &deflt ) const

  Reads an encrypted string entry stored with \a key, defaulting to \a deflt if there is no entry.
*/

/*!
  \internal
  For compatibility, non-const version.
*/
QString KateConfig::readEntryCrypt( const QString &key, const QString &deflt )
{
    QString res = readEntryDirect( key+"["+lang+"]" );
    if ( res.isNull() && glang.isEmpty() )
	res = readEntryDirect( key+"["+glang+"]" );
    if ( res.isNull() )
	res = readEntryDirect( key, QString::null );
    if ( res.isNull() )
	return deflt;
    return decipher(res);
}

/*!
  \fn QString KateConfig::readEntryDirect( const QString &key, const QString &deflt ) const
  \internal
*/

/*!
  \internal
  For compatibility, non-const version.
*/
QString KateConfig::readEntryDirect( const QString &key, const QString &deflt )
{
    if ( git == groups.end() ) {
	//qWarning( "no group set" );
	return deflt;
    }
    KateConfigGroup::ConstIterator it = ( *git ).find( key );
    if ( it != ( *git ).end() )
	return *it;
    else
	return deflt;
}

/*!
  \fn int KateConfig::readNumEntry( const QString &key, int deflt ) const
  Reads a numeric entry stored with \a key, defaulting to \a deflt if there is no entry.
*/

/*!
  \internal
  For compatibility, non-const version.
*/
int KateConfig::readNumEntry( const QString &key, int deflt )
{
    QString s = readEntry( key );
    if ( s.isEmpty() )
	return deflt;
    else
	return s.toInt();
}

/*!
  \fn bool KateConfig::readBoolEntry( const QString &key, bool deflt ) const
  Reads a bool entry stored with \a key, defaulting to \a deflt if there is no entry.
*/

/*!
  \internal
  For compatibility, non-const version.
*/
bool KateConfig::readBoolEntry( const QString &key, bool deflt )
{
    QString s = readEntry( key );
    if ( s.isEmpty() )
	return deflt;
    else
	return (bool)s.toInt();
}

/*!
  \fn QStringList KateConfig::readListEntry( const QString &key, const QChar &sep ) const
  Reads a string list entry stored with \a key, and with \a sep as the separator.
*/

/*!
  \internal
  For compatibility, non-const version.
*/
QStringList KateConfig::readListEntry( const QString &key, const QChar &sep )
{
    QString s = readEntry( key );
    if ( s.isEmpty() )
	return QStringList();
    else
	return QStringList::split( sep, s );
}

QColor KateConfig::readColorEntry( const QString &key, const QColor &def ) const
{
    QStringList list = readListEntry(key, QChar(','));
    if( list.count() != 3 )
        return def;

    return QColor(list[0].toInt(), list[1].toInt(), list[2].toInt());
}

QFont KateConfig::readFontEntry( const QString &key, const QFont &def ) const
{
    QStringList list = readListEntry(key, QChar(','));
    if( list.count() != 5 )
        return def;

    return QFont(list[0], list[1].toInt(), list[2].toInt(), (bool)list[3].toInt(), (QFont::CharSet)list[4].toInt());
}

QValueList<int> KateConfig::readIntListEntry( const QString &key ) const
{
    QString s = readEntry( key );
    QValueList<int> il;
    if ( s.isEmpty() )
	return il;

    QStringList l = QStringList::split( QChar(','), s );

    QStringList::Iterator l_it;
    for( l_it = l.begin(); l_it != l.end(); ++l_it )
        il.append( (*l_it).toInt() );
    return il;
}

/*!
  Removes all entries from the current group.
*/
void KateConfig::clearGroup()
{
    if ( git == groups.end() ) {
	qWarning( "no group set" );
	return;
    }
    if ( !(*git).isEmpty() ) {
	( *git ).clear();
	changed = TRUE;
    }
}

/*!
  \internal
*/
void KateConfig::write( const QString &fn )
{
    QString strNewFile;
    if ( !fn.isEmpty() )
	filename = fn;
    strNewFile = filename + ".new";

    QFile f( strNewFile );
    if ( !f.open( IO_WriteOnly|IO_Raw ) ) {
	qWarning( "could not open for writing `%s'", strNewFile.latin1() );
	git = groups.end();
	return;
    }
    
    QString str;
    QCString cstr;    
    QMap< QString, KateConfigGroup >::Iterator g_it = groups.begin();

    for ( ; g_it != groups.end(); ++g_it ) {
 	str += "[" + g_it.key() + "]\n";
 	KateConfigGroup::Iterator e_it = ( *g_it ).begin();
 	for ( ; e_it != ( *g_it ).end(); ++e_it )
 	    str += e_it.key() + " = " + *e_it + "\n";
    }
    cstr = str.utf8();
    
    int total_length;
    total_length = f.writeBlock( cstr.data(), cstr.length() );
    if ( total_length != int(cstr.length()) ) {
	QMessageBox::critical( 0, QObject::tr("Out of Space"),
			       QObject::tr("There was a problem creating\nKateConfiguration Information \nfor this program.\n\nPlease free up some space and\ntry again.") );
	f.close();
	QFile::remove( strNewFile );
	return;
    }
    
    f.close();
    // now rename the file...
    if ( rename( strNewFile, filename ) < 0 ) {
	qWarning( "problem renaming the file %s to %s", strNewFile.latin1(), 
		  filename.latin1() );
	QFile::remove( strNewFile );
    }	
}

/*!
  Returns whether the KateConfig is in a valid state.
*/
bool KateConfig::isValid() const
{
    return groups.end() != git;
}

/*!
  \internal
*/
void KateConfig::read()
{
    changed = FALSE;

    if ( !QFileInfo( filename ).exists() ) {
	git = groups.end();
	return;
    }

    QFile f( filename );
    if ( !f.open( IO_ReadOnly ) ) {
	git = groups.end();
	return;
    }

    QTextStream s( &f );
#if QT_VERSION <= 230 && defined(QT_NO_CODECS)
    // The below should work, but doesn't in Qt 2.3.0
    s.setCodec( QTextCodec::codecForMib( 106 ) );
#else
    s.setEncoding( QTextStream::UnicodeUTF8 );
#endif

    QStringList list = QStringList::split('\n', s.read() );
    f.close();

    for ( QStringList::Iterator it = list.begin(); it != list.end(); ++it ) {
        if ( !parse( *it ) ) {
            git = groups.end();
            return;
        }
    }
}

/*!
  \internal
*/
bool KateConfig::parse( const QString &l )
{
    QString line = l.stripWhiteSpace();
    
    if ( line [0] == QChar ( '#' ))
    	return true; // ignore comments
    
    if ( line[ 0 ] == QChar( '[' ) ) {
	QString gname = line;
	gname = gname.remove( 0, 1 );
	if ( gname[ (int)gname.length() - 1 ] == QChar( ']' ) )
	    gname = gname.remove( gname.length() - 1, 1 );
	git = groups.insert( gname, KateConfigGroup() );
    } else if ( !line.isEmpty() ) {
	if ( git == groups.end() )
	    return FALSE;
	int eq = line.find( '=' );
	if ( eq == -1 )
	    return FALSE;
	QString key = line.left(eq).stripWhiteSpace();
	QString value = line.mid(eq+1).stripWhiteSpace();
	( *git ).insert( key, value );
    }
    return TRUE;
}