/*  -*- c++ -*-
    sievejob.h

    KMail, the KDE mail client.
    Copyright (c) 2002 Marc Mutz <mutz@kde.org>

    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License,
    version 2.0, as published by the Free Software Foundation.
    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software Foundation,
    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, US
*/

#include "sievejob.h"

#include <kio/job.h>
using KIO::Job;
// <kio/global.h>
using KIO::UDSAtomTypes;
using KIO::UDSEntryList;
using KIO::UDSEntry;
#include <kdebug.h>

#include <qtextcodec.h>

#include <cassert>

namespace KMail {

  SieveJob::SieveJob( const KURL & url, const QString & script,
		      const QValueStack<Command> & commands,
		      QObject * parent, const char * name )
    : QObject( parent, name ),
      mUrl( url ), mJob( 0 ), mDec( 0 ),
      mScript( script ), mFileExists( DontKnow ), mCommands( commands )
  {
    assert( !commands.isEmpty() );
    schedule( commands.top() );
  }

  SieveJob::~SieveJob() {
    kill();
    delete mDec;
    kdDebug(5006) << "~SieveJob()" << endl;
  }

  void SieveJob::kill( bool quiet ) {
    if ( mJob ) mJob->kill( quiet );
  }

  void SieveJob::schedule( Command command ) {
    switch ( command ) {
    case Get:
      kdDebug(5006) << "SieveJob::schedule: get( " << mUrl.url() << " )" << endl;
      mJob = KIO::get( mUrl );
      connect( mJob, SIGNAL(data(KIO::Job*,const QByteArray&)),
	       SLOT(slotData(KIO::Job*,const QByteArray&)) );
      break;
    case Put:
      kdDebug(5006) << "SieveJob::schedule: put( " << mUrl.url() << " )" << endl;
      mJob = KIO::put( mUrl, 0600, true /*overwrite*/, false /*resume*/ );
      connect( mJob, SIGNAL(dataReq(KIO::Job*,QByteArray&)),
	       SLOT(slotDataReq(KIO::Job*,QByteArray&)) );
      break;
    case Activate:
      kdDebug(5006) << "SieveJob::schedule: chmod( " << mUrl.url() << ", 0700 )"
		<< endl;
      mJob = KIO::chmod( mUrl, 0700 );
      break;
    case Deactivate:
      kdDebug(5006) << "SieveJob::schedule: chmod( " << mUrl.url() << ", 0600 )"
		<< endl;
      mJob = KIO::chmod( mUrl, 0600 );
      break;
    case SearchActive:
      kdDebug(5006) << "SieveJob::schedule: listDir( " << mUrl.url() << " )" << endl;
      {
	KURL url = mUrl;
	url.cd("..");
	kdDebug(5006) << "SieveJob::schedule: listDir's real URL: " << url.url()
		  << endl;
	mJob = KIO::listDir( url );
	connect( mJob, SIGNAL(entries(KIO::Job*,const KIO::UDSEntryList&)),
		 SLOT(slotEntries(KIO::Job*,const KIO::UDSEntryList&)) );
	break;
      }
    default:
      assert( 0 );
    }
    // common to all jobs:
    connect( mJob, SIGNAL(result(KIO::Job*)), SLOT(slotResult(KIO::Job*)) );
  }

  void SieveJob::slotData( Job *, const QByteArray & data ) {
    // check for end-of-data marker:
    if ( data.size() == 0 )
      return;

    // make sure we have a textdecoder;
    if ( !mDec )
      mDec = QTextCodec::codecForMib( 106 /*utf8*/ )->makeDecoder();

    // decode utf8; add to mScript:
    mScript += mDec->toUnicode( data.data(), data.size() );
  }

  void SieveJob::slotDataReq( Job *, QByteArray & data ) {
    // check whether we have already sent our data:
    if ( mScript.isEmpty() ) {
      data = QByteArray(); // end-of-data marker
      return;
    }

    // Convert mScript into UTF-8:
    data = mScript.utf8();

    // "data" contains a trailing NUL, remove:
    if ( data.size() > 0 && data[(int)data.size() - 1] == '\0' )
      data.resize( data.size() - 1 );

    // mark mScript sent:
    mScript = QString::null;
  }

  void SieveJob::slotEntries( Job *, const UDSEntryList & l ) {
    if ( !mActiveScriptName.isEmpty() && mFileExists != DontKnow )
      return;
    // loop over entries:
    for ( UDSEntryList::const_iterator it = l.begin() ; it != l.end() ; ++it ) {
      // loop over atoms to find the UDS_ACCESS and UDS_NAME atoms;
      // note if we find an exec'able file ( == sctive script )
      // or the requested filename (mUrl.fileName())
      QString filename;
      bool isActive = false;
      for ( UDSEntry::const_iterator et = (*it).begin() ; et != (*it).end() ; ++ et )
	if ( (*et).m_uds == KIO::UDS_NAME ) {
	  if ( isActive ) { // have all info...
	    mActiveScriptName = (*et).m_str;
	    break;
	  } else // still need access info...
	    filename = (*et).m_str;
	} else if ( (*et).m_uds == KIO::UDS_ACCESS && (*et).m_long == 0700 ) {
	  if ( !filename.isEmpty() ) { // have all info...
	    mActiveScriptName = filename;
	    break;
	  } else // still need filename...
	    isActive = true;
	}
      if ( mFileExists == DontKnow && filename == mUrl.fileName() )
	mFileExists = Yes;
      if ( mFileExists == Yes && !mActiveScriptName.isEmpty() )
	return; // early return if we have all information
    }
  }

  void SieveJob::slotResult( Job * job ) {
    // First, let's see if we come back from a listDir. If so, set
    // mFileExists to No if we didn't see the mUrl.fileName() during
    // listDir...
    if ( mCommands.top() == SearchActive &&
	 mFileExists == DontKnow && !job->error() )
      mFileExists = No;
    // prepare for next round:
    mCommands.pop();
    delete mDec; mDec = 0;

    if ( mSieveCapabilities.empty() ) {
      mSieveCapabilities = QStringList::split( ' ', job->queryMetaData( "sieveExtensions" ) );
      kdDebug(5006) << "received sieve extensions supported:" << endl
		<< mSieveCapabilities.join("\n") << endl;
    }

    // check for errors:
    if ( job->error() ) {
      job->showErrorDialog( 0 );
      emit result( this, false, mScript,
		   mUrl.fileName() == mActiveScriptName );
      mJob = 0;
      delete this;
      return;
    }

    // check for new tasks:
    if ( !mCommands.empty() ) {
      // Don't fail get'ting a non-existant script:
      if ( mCommands.top() == Get && mFileExists == No ) {
	mScript = QString::null;
	mCommands.pop();
      }
    }

    if ( mCommands.empty() ) {
      // was last command; report success and delete this object:
      emit result( this, true, mScript, mUrl.fileName() == mActiveScriptName );
      mJob = 0; // deletes itself on returning from this slot
      delete this;
      return;
    } else {
      // schedule the next command:
      schedule( mCommands.top() );
    }
  }

  SieveJob * SieveJob::put( const KURL & dest, const QString & script,
			    bool makeActive, bool wasActive ) {
    QValueStack<Command> commands;
    if ( makeActive )
      commands.push( Activate );
    if ( wasActive )
      commands.push( Deactivate );
    commands.push( Put );
    return new SieveJob( dest, script, commands );
  }

  SieveJob * SieveJob::get( const KURL & src ) {
    QValueStack<Command> commands;
    commands.push( Get );
    commands.push( SearchActive );
    return new SieveJob( src, QString::null, commands );
  }


} // namespace KMail

#include "sievejob.moc"