/*
 * Copyright (c) 1996-1998 Stefan Taferner <taferner@kde.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 */

#include "filteractionrewriteheader.h"

#include "../regexplineedit.h"
#include <messageviewer/minimumcombobox.h>

#include <KDE/KLineEdit>
#include <KDE/KLocale>

#include <QHBoxLayout>
#include <QLabel>
#include <QTextDocument>

using namespace MailCommon;

FilterAction* FilterActionRewriteHeader::newAction()
{
  return new FilterActionRewriteHeader;
}

FilterActionRewriteHeader::FilterActionRewriteHeader( QObject *parent )
  : FilterActionWithStringList( "rewrite header", i18n( "Rewrite Header" ), parent )
{
  mParameterList << ""
                 << "Subject"
                 << "Reply-To"
                 << "Delivered-To"
                 << "X-KDE-PR-Message"
                 << "X-KDE-PR-Package"
                 << "X-KDE-PR-Keywords";

  mParameter = mParameterList.at( 0 );
}

FilterAction::ReturnCode FilterActionRewriteHeader::process( ItemContext &context ) const
{
  if ( mParameter.isEmpty() || !mRegExp.isValid() )
    return ErrorButGoOn;

  const KMime::Message::Ptr msg = context.item().payload<KMime::Message::Ptr>();

  const QByteArray param(mParameter.toLatin1());
  KMime::Headers::Base *header = msg->headerByType(param);
  if ( !header ) {
    return GoOn; //TODO: Maybe create a new header by type?
  }

  QString value = header->asUnicodeString();

  const QString newValue = value.replace( mRegExp, mReplacementString );

  msg->removeHeader( param );

  KMime::Headers::Base *newheader = KMime::Headers::createHeader(param);
  if ( !newheader ) {
    newheader = new KMime::Headers::Generic(param, msg.get(), newValue, "utf-8" );
  } else {
    newheader->fromUnicodeString( newValue, "utf-8" );
  }
  msg->setHeader( newheader );
  msg->assemble();

  context.setNeedsPayloadStore();

  return GoOn;
}

SearchRule::RequiredPart FilterActionRewriteHeader::requiredPart() const
{
  return SearchRule::CompleteMessage;
}


QWidget* FilterActionRewriteHeader::createParamWidget( QWidget *parent ) const
{
  QWidget *widget = new QWidget( parent );
  QHBoxLayout *layout = new QHBoxLayout( widget );
  layout->setSpacing( 4 );
  layout->setMargin( 0 );

  MessageViewer::MinimumComboBox *comboBox = new MessageViewer::MinimumComboBox( widget );
  comboBox->setEditable( true );
  comboBox->setObjectName( "combo" );
  comboBox->setInsertPolicy( QComboBox::InsertAtBottom );
  layout->addWidget( comboBox, 0 /* stretch */ );

  KCompletion *comp = comboBox->completionObject();
  comp->setIgnoreCase(true);
  comp->insertItems(mParameterList);
  comp->setCompletionMode(KGlobalSettings::CompletionPopupAuto);

  QLabel *label = new QLabel( i18n( "Replace:" ), widget );
  label->setFixedWidth( label->sizeHint().width() );
  layout->addWidget( label, 0 );

  RegExpLineEdit *regExpLineEdit = new RegExpLineEdit( widget );
  regExpLineEdit->setObjectName( "search" );
  layout->addWidget( regExpLineEdit, 1 );

  label = new QLabel( i18n( "With:" ), widget );
  label->setFixedWidth( label->sizeHint().width() );
  layout->addWidget( label, 0 );

  KLineEdit *lineEdit = new KLineEdit( widget );
  lineEdit->setObjectName( "replace" );
  lineEdit->setClearButtonShown( true );
  lineEdit->setTrapReturnKey(true);
  layout->addWidget( lineEdit, 1 );

  setParamWidgetValue( widget );

  connect( comboBox, SIGNAL(currentIndexChanged(int)),
           this, SIGNAL(filterActionModified()) );
  connect( comboBox->lineEdit(), SIGNAL(textChanged(QString)),
           this, SIGNAL(filterActionModified()) );
  connect( regExpLineEdit, SIGNAL(textChanged(QString)),
           this, SIGNAL(filterActionModified()) );
  connect( lineEdit, SIGNAL(textChanged(QString)),
           this, SIGNAL(filterActionModified()) );

  return widget;
}

void FilterActionRewriteHeader::setParamWidgetValue( QWidget *paramWidget ) const
{
  const int index = mParameterList.indexOf( mParameter );
  MessageViewer::MinimumComboBox *comboBox = paramWidget->findChild<MessageViewer::MinimumComboBox*>( "combo" );
  Q_ASSERT( comboBox );

  comboBox->clear();
  comboBox->addItems( mParameterList );
  if ( index < 0 ) {
    comboBox->addItem( mParameter );
    comboBox->setCurrentIndex( comboBox->count() - 1 );
  } else {
    comboBox->setCurrentIndex( index );
  }

  RegExpLineEdit *regExpLineEdit = paramWidget->findChild<RegExpLineEdit*>( "search" );
  Q_ASSERT( regExpLineEdit );
  regExpLineEdit->setText( mRegExp.pattern() );

  KLineEdit *lineEdit = paramWidget->findChild<KLineEdit*>( "replace" );
  Q_ASSERT( lineEdit );
  lineEdit->setText( mReplacementString );
}

void FilterActionRewriteHeader::applyParamWidgetValue( QWidget *paramWidget )
{
  const MessageViewer::MinimumComboBox *comboBox = paramWidget->findChild<MessageViewer::MinimumComboBox*>( "combo" );
  Q_ASSERT( comboBox );
  mParameter = comboBox->currentText();

  const RegExpLineEdit *regExpLineEdit = paramWidget->findChild<RegExpLineEdit*>( "search" );
  Q_ASSERT( regExpLineEdit );
  mRegExp.setPattern( regExpLineEdit->text() );

  const KLineEdit *lineEdit = paramWidget->findChild<KLineEdit*>( "replace" );
  Q_ASSERT( lineEdit );
  mReplacementString = lineEdit->text();
}

void FilterActionRewriteHeader::clearParamWidget( QWidget *paramWidget ) const
{
  MessageViewer::MinimumComboBox *comboBox = paramWidget->findChild<MessageViewer::MinimumComboBox*>( "combo" );
  Q_ASSERT( comboBox );
  comboBox->setCurrentIndex( 0 );

  RegExpLineEdit *regExpLineEdit = paramWidget->findChild<RegExpLineEdit*>( "search" );
  Q_ASSERT( regExpLineEdit );
  regExpLineEdit->clear();

  KLineEdit *lineEdit = paramWidget->findChild<KLineEdit*>( "replace" );
  Q_ASSERT( lineEdit );
  lineEdit->clear();
}

QString FilterActionRewriteHeader::argsAsString() const
{
  QString result = mParameter;
  result += QLatin1Char( '\t' );
  result += mRegExp.pattern();
  result += QLatin1Char( '\t' );
  result += mReplacementString;

  return result;
}

QString FilterActionRewriteHeader::displayString() const
{
  return label() + QLatin1String( " \"" ) + Qt::escape( argsAsString() ) + QLatin1String( "\"" );
}

void FilterActionRewriteHeader::argsFromString( const QString &argsStr )
{
  const QStringList list = argsStr.split( QLatin1Char( '\t' ) );
  QString result;

  result = list[ 0 ];
  mRegExp.setPattern( list[ 1 ] );
  mReplacementString = list[ 2 ];

  int index = mParameterList.indexOf( result );
  if ( index < 0 ) {
    mParameterList.append( result );
    index = mParameterList.count() - 1;
  }

  mParameter = mParameterList.at( index );
}



#include "filteractionrewriteheader.moc"
