/*
    This file is part of Akonadi Contact.

    Copyright (c) 2007-2009 Tobias Koenig <tokoe@kde.org>

    This library is free software; you can redistribute it and/or modify it
    under the terms of the GNU Library General Public License as published by
    the Free Software Foundation; either version 2 of the License, or (at your
    option) any later version.

    This library 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 Library General Public
    License for more details.

    You should have received a copy of the GNU Library General Public License
    along with this library; see the file COPYING.LIB.  If not, write to the
    Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
    02110-1301, USA.
*/

#include "collectioncombobox.h"
#include "collectioncombobox_p.h"

#include "asyncselectionhandler_p.h"
#include "collectiondialog.h"

#include <akonadi/changerecorder.h>
#include <akonadi/collectionfetchscope.h>
#include <akonadi/collectionfilterproxymodel.h>
#include <akonadi/entityrightsfiltermodel.h>
#include <akonadi/entitytreemodel.h>
#include <akonadi/session.h>

#include <kdescendantsproxymodel.h>
#include "collectionutils_p.h"

#include <QtCore/QAbstractItemModel>
#include <QtCore/QEvent>
#include <QtGui/QMouseEvent>

using namespace Akonadi;

class CollectionComboBox::Private
{
  public:
    Private( QAbstractItemModel *customModel, CollectionComboBox *parent )
      : mParent( parent ), mMonitor( 0 ), mModel( 0 )
    {
      if ( customModel ) {
        mBaseModel = customModel;
      } else {
        mMonitor = new Akonadi::ChangeRecorder( mParent );
        mMonitor->fetchCollection( true );
        mMonitor->setCollectionMonitored( Akonadi::Collection::root() );

        mModel = new EntityTreeModel( mMonitor, mParent );
        mModel->setItemPopulationStrategy( EntityTreeModel::NoItemPopulation );

        mBaseModel = mModel;
      }

      KDescendantsProxyModel *proxyModel = new KDescendantsProxyModel( parent );
      proxyModel->setDisplayAncestorData( true );
      proxyModel->setSourceModel( mBaseModel );

      mMimeTypeFilterModel = new CollectionFilterProxyModel( parent );
      mMimeTypeFilterModel->setSourceModel( proxyModel );

      mRightsFilterModel = new EntityRightsFilterModel( parent );
      mRightsFilterModel->setSourceModel( mMimeTypeFilterModel );

      mParent->setModel( mRightsFilterModel );
      mParent->model()->sort( mParent->modelColumn() );

      mSelectionHandler = new AsyncSelectionHandler( mRightsFilterModel, mParent );
      mParent->connect( mSelectionHandler, SIGNAL(collectionAvailable(QModelIndex)),
                        mParent, SLOT(activated(QModelIndex)) );

      mParent->connect( mParent, SIGNAL(activated(int)),
                        mParent, SLOT(activated(int)) );
    }

    ~Private()
    {
    }

    void activated( int index );
    void activated( const QModelIndex& index );

    CollectionComboBox *mParent;

    ChangeRecorder *mMonitor;
    EntityTreeModel *mModel;
    QAbstractItemModel *mBaseModel;
    CollectionFilterProxyModel *mMimeTypeFilterModel;
    EntityRightsFilterModel *mRightsFilterModel;
    AsyncSelectionHandler *mSelectionHandler;
};

void CollectionComboBox::Private::activated( int index )
{
  const QModelIndex modelIndex = mParent->model()->index( index, 0 );
  if ( modelIndex.isValid() )
    emit mParent->currentChanged( modelIndex.data( EntityTreeModel::CollectionRole).value<Collection>() );
}

void CollectionComboBox::Private::activated( const QModelIndex &index )
{
  mParent->setCurrentIndex( index.row() );
}

MobileEventHandler::MobileEventHandler( CollectionComboBox *comboBox, CollectionFilterProxyModel *mimeTypeFilter,
                                        EntityRightsFilterModel *accessRightsFilter, QAbstractItemModel *customModel )
  : QObject( comboBox ),
    mComboBox( comboBox ),
    mMimeTypeFilter( mimeTypeFilter ),
    mAccessRightsFilter( accessRightsFilter ),
    mCustomModel( customModel )
{
}

bool MobileEventHandler::eventFilter( QObject *object, QEvent *event )
{
  if ( object == mComboBox && mComboBox->isEnabled() && event->type() == QEvent::MouseButtonPress ) {

    const QMouseEvent *mouseEvent = static_cast<QMouseEvent*>( event );

    // we receive mouse events from other widgets as well, so check for ours
    if ( mComboBox->rect().contains( mouseEvent->pos() ) ) {
      QMetaObject::invokeMethod( this, "openDialog", Qt::QueuedConnection );
    }

    return true;
  }

  return QObject::eventFilter( object, event );
}

void MobileEventHandler::openDialog()
{
  Akonadi::CollectionDialog dialog( mCustomModel );
  dialog.setMimeTypeFilter( mMimeTypeFilter->mimeTypeFilters() );
  dialog.setAccessRightsFilter( mAccessRightsFilter->accessRights() );

  if ( dialog.exec() ) {
    const Akonadi::Collection collection = dialog.selectedCollection();
    const QModelIndex index = Akonadi::EntityTreeModel::modelIndexForCollection( mComboBox->model(), collection );
    mComboBox->setCurrentIndex( index.row() );
  }
}


CollectionComboBox::CollectionComboBox( QWidget *parent )
  : KComboBox( parent ), d( new Private( 0, this ) )
{
#ifdef KDEPIM_MOBILE_UI
  MobileEventHandler *handler = new MobileEventHandler( this, d->mMimeTypeFilterModel, d->mRightsFilterModel, d->mBaseModel );
  installEventFilter( handler );
#endif
}

CollectionComboBox::CollectionComboBox( QAbstractItemModel *model, QWidget *parent )
  : KComboBox( parent ), d( new Private( model, this ) )
{
#ifdef KDEPIM_MOBILE_UI
  MobileEventHandler *handler = new MobileEventHandler( this, d->mMimeTypeFilterModel, d->mRightsFilterModel, d->mBaseModel );
  installEventFilter( handler );
#endif
}

CollectionComboBox::~CollectionComboBox()
{
  delete d;
}

void CollectionComboBox::setMimeTypeFilter( const QStringList &contentMimeTypes )
{
  d->mMimeTypeFilterModel->clearFilters();
  d->mMimeTypeFilterModel->addMimeTypeFilters( contentMimeTypes );

  if ( d->mMonitor )
    foreach ( const QString &mimeType, contentMimeTypes )
      d->mMonitor->setMimeTypeMonitored( mimeType, true );
}

QStringList CollectionComboBox::mimeTypeFilter() const
{
  return d->mMimeTypeFilterModel->mimeTypeFilters();
}

void CollectionComboBox::setAccessRightsFilter( Collection::Rights rights )
{
  d->mRightsFilterModel->setAccessRights( rights );
}

Akonadi::Collection::Rights CollectionComboBox::accessRightsFilter() const
{
  return d->mRightsFilterModel->accessRights();
}

void CollectionComboBox::setDefaultCollection( const Collection &collection )
{
  d->mSelectionHandler->waitForCollection( collection );
}

Akonadi::Collection CollectionComboBox::currentCollection() const
{
  const QModelIndex modelIndex = model()->index( currentIndex(), 0 );
  if ( modelIndex.isValid() )
    return modelIndex.data( Akonadi::EntityTreeModel::CollectionRole ).value<Collection>();
  else
    return Akonadi::Collection();
}

#include "collectioncombobox.moc"
#include "collectioncombobox_p.moc"
