/* Copyright 2009 Klarälvdalens Datakonsult AB

   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) version 3 or any later version
   accepted by the membership of KDE e.V. (or its successor approved
   by the membership of KDE e.V.), which shall act as a proxy
   defined in Section 14 of version 3 of the license.

   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, see <http://www.gnu.org/licenses/>.
*/
#include "archivefolderdialog.h"

#include "mailcommon/backupjob.h"
#include "kmkernel.h"
#include "kmmainwidget.h"
#include "folderrequester.h"
#include "messageviewer/util.h"

#include <Akonadi/Collection>

#include <klocale.h>
#include <kcombobox.h>
#include <kurlrequester.h>
#include <kmessagebox.h>
#include <KMimeType>

#include <qlabel.h>
#include <qcheckbox.h>
#include <QGridLayout>

using namespace KMail;
using namespace MailCommon;

static QString standardArchivePath( const QString &folderName )
{
  QString currentPath = KGlobalSettings::documentPath();
  QDir dir( currentPath );
  if( !dir.exists() )
    currentPath = QDir::homePath();
  return currentPath + QLatin1Char( '/' ) +
    i18nc( "Start of the filename for a mail archive file" , "Archive" ) + QLatin1Char( '_' ) + folderName + QLatin1Char( '_' ) + QDate::currentDate().toString( Qt::ISODate ) + QLatin1String( ".tar.bz2" );
}

ArchiveFolderDialog::ArchiveFolderDialog( QWidget *parent )
  : KDialog( parent ), mParentWidget( parent )
{
  setObjectName( "archive_folder_dialog" );
  setCaption( i18n( "Archive Folder" ) );
  setButtons( Ok|Cancel );
  setDefaultButton( Ok );
  setButtonText(KDialog::Ok,i18n("Archive"));
  setModal( true );
  QWidget *mainWidget = new QWidget( this );
  QGridLayout *mainLayout = new QGridLayout( mainWidget );
  mainLayout->setSpacing( KDialog::spacingHint() );
  mainLayout->setMargin( KDialog::marginHint() );
  setMainWidget( mainWidget );

  int row = 0;

  // TODO: Explaination label

  QLabel *folderLabel = new QLabel( i18n( "&Folder:" ), mainWidget );
  mainLayout->addWidget( folderLabel, row, 0 );
  mFolderRequester = new FolderRequester( mainWidget );
  mFolderRequester->setMustBeReadWrite( false );
  mFolderRequester->setNotAllowToCreateNewFolder( true );
  connect( mFolderRequester, SIGNAL(folderChanged(Akonadi::Collection)), SLOT(slotFolderChanged(Akonadi::Collection)) );
  folderLabel->setBuddy( mFolderRequester );
  mainLayout->addWidget( mFolderRequester, row, 1 );
  row++;

  QLabel *formatLabel = new QLabel( i18n( "F&ormat:" ), mainWidget );
  mainLayout->addWidget( formatLabel, row, 0 );
  mFormatComboBox = new KComboBox( mainWidget );
  formatLabel->setBuddy( mFormatComboBox );

  // These combobox values have to stay in sync with the ArchiveType enum from BackupJob!
  mFormatComboBox->addItem( i18n( "Compressed Zip Archive (.zip)" ) );
  mFormatComboBox->addItem( i18n( "Uncompressed Archive (.tar)" ) );
  mFormatComboBox->addItem( i18n( "BZ2-Compressed Tar Archive (.tar.bz2)" ) );
  mFormatComboBox->addItem( i18n( "GZ-Compressed Tar Archive (.tar.gz)" ) );
  mFormatComboBox->setCurrentIndex( 2 );
  connect( mFormatComboBox, SIGNAL(activated(int)),
           this, SLOT(slotFixFileExtension()) );
  mainLayout->addWidget( mFormatComboBox, row, 1 );
  row++;

  QLabel *fileNameLabel = new QLabel( i18n( "&Archive File:" ), mainWidget );
  mainLayout->addWidget( fileNameLabel, row, 0 );
  mUrlRequester = new KUrlRequester( mainWidget );
  mUrlRequester->setMode( KFile::LocalOnly | KFile::File );
  mUrlRequester->setFilter( "*.tar *.zip *.tar.gz *.tar.bz2" );
  fileNameLabel->setBuddy( mUrlRequester );
  connect( mUrlRequester, SIGNAL(urlSelected(KUrl)),
           this, SLOT(slotFixFileExtension()) );
  connect( mUrlRequester, SIGNAL(textChanged(QString)),
          this, SLOT(slotUrlChanged(QString)) );
  mainLayout->addWidget( mUrlRequester, row, 1 );
  row++;

  // TODO: Make this appear more dangerous!
  mDeleteCheckBox = new QCheckBox( i18n( "&Delete folder and subfolders after completion" ), mainWidget );
  mainLayout->addWidget( mDeleteCheckBox, row, 0, 1, 2, Qt::AlignLeft );
  row++;

  mRecursiveCheckBox = new QCheckBox( i18n( "Archive all subfolders" ), mainWidget );
  connect( mRecursiveCheckBox, SIGNAL(clicked()), this, SLOT(slotRecursiveCheckboxClicked()) );
  mainLayout->addWidget( mRecursiveCheckBox, row, 0, 1, 2, Qt::AlignLeft );
  mRecursiveCheckBox->setChecked( true );
  row++;

  // TODO: what's this, tooltips

  // TODO: Warn that user should do mail check for online IMAP and possibly cached IMAP as well

  mainLayout->setColumnStretch( 1, 1 );
  mainLayout->addItem( new QSpacerItem( 1, 1, QSizePolicy::Expanding, QSizePolicy::Expanding ), row, 0 );

  // Make it a bit bigger, else the folder requester cuts off the text too early
  resize( 500, minimumSize().height() );
}

bool canRemoveFolder( const Akonadi::Collection& col )
{
  const QSharedPointer<FolderCollection> folder = FolderCollection::forCollection( col,false );
  return folder
    && col.isValid()
    && !col.isVirtual()
    && ( col.rights() & Akonadi::Collection::CanDeleteCollection )
    && !folder->isStructural()
    && !folder->isSystemFolder()
    && ( col.resource() != QLatin1String( "akonadi_nepomuktag_resource" ) );
}

void ArchiveFolderDialog::slotRecursiveCheckboxClicked()
{
  slotFolderChanged( mFolderRequester->collection() );
}

void ArchiveFolderDialog::slotFolderChanged( const Akonadi::Collection &folder )
{
  mDeleteCheckBox->setEnabled( allowToDeleteFolders( folder ) );
}

bool ArchiveFolderDialog::allowToDeleteFolders( const Akonadi::Collection &folder) const
{
  return canRemoveFolder( folder ) && mRecursiveCheckBox->isChecked();
}

void ArchiveFolderDialog::setFolder( const Akonadi::Collection &defaultCollection )
{
  mFolderRequester->setCollection( defaultCollection );
  // TODO: what if the file already exists?
  mUrlRequester->setUrl( standardArchivePath( defaultCollection.name() ) );
  const QSharedPointer<FolderCollection> folder = FolderCollection::forCollection( defaultCollection, false );
  mDeleteCheckBox->setEnabled( allowToDeleteFolders( defaultCollection ) );
  enableButtonOk( defaultCollection.isValid() && folder && !folder->isStructural() );
}

void ArchiveFolderDialog::slotButtonClicked( int button )
{
  if ( button == KDialog::Cancel ) {
    reject();
    return;
  }
  Q_ASSERT( button == KDialog::Ok );

  if ( !MessageViewer::Util::checkOverwrite( mUrlRequester->url(), this ) ) {
    return;
  }

  if ( !mFolderRequester->hasCollection() ) {
    KMessageBox::information( this, i18n( "Please select the folder that should be archived." ),
                              i18n( "No folder selected" ) );
    return;
  }

  MailCommon::BackupJob *backupJob = new MailCommon::BackupJob( mParentWidget );
  backupJob->setRootFolder( mFolderRequester->collection() );
  backupJob->setSaveLocation( mUrlRequester->url() );
  backupJob->setArchiveType( static_cast<BackupJob::ArchiveType>( mFormatComboBox->currentIndex() ) );
  backupJob->setDeleteFoldersAfterCompletion( mDeleteCheckBox->isEnabled() && mDeleteCheckBox->isChecked());
  backupJob->setRecursive( mRecursiveCheckBox->isChecked() );
  backupJob->start();
  accept();
}

void ArchiveFolderDialog::slotFixFileExtension()
{
  const int numExtensions = 4;
  // The extensions here are also sorted, like the enum order of BackupJob::ArchiveType
  const char *extensions[numExtensions] = { ".zip", ".tar", ".tar.bz2", ".tar.gz" };

  QString fileName = mUrlRequester->url().path();
  if ( fileName.isEmpty() )
    fileName = standardArchivePath( mFolderRequester->hasCollection() ?
                                    mFolderRequester->collection().name() : QString() );

  const QString extension = KMimeType::extractKnownExtension(fileName);
  if(!extension.isEmpty()) {
    fileName = fileName.left( fileName.length() - extension.length() - 1 );
  }

  // Now, we've got a filename without an extension, simply append the correct one
  fileName += extensions[mFormatComboBox->currentIndex()];
  mUrlRequester->setUrl( fileName );
}

void ArchiveFolderDialog::slotUrlChanged(const QString &url)
{
    enableButtonOk(!url.isEmpty());
}

#include "archivefolderdialog.moc"