/*
    This file is part of Akonadi Contact.

    Copyright (c) 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 "contactgroupeditordelegate_p.h"

#include "contactcompletionmodel_p.h"
#include "contactgroupmodel_p.h"

#include <akonadi/entitytreemodel.h>
#include <kcombobox.h>
#include <kicon.h>
#include <klocalizedstring.h>

#include <QtCore/QTimer>
#include <QAbstractItemView>
#include <QCompleter>
#include <QMouseEvent>
#include <QSortFilterProxyModel>

using namespace Akonadi;

/**
 * @short Model that filters out all contacts without email address.
 */
class ContactsWithEmailFilterModel : public QSortFilterProxyModel
{
  public:
    ContactsWithEmailFilterModel( QObject *parent )
      : QSortFilterProxyModel( parent )
    {
      // contact names should be sorted correctly
      setSortLocaleAware( true );
    }

  protected:
    virtual bool filterAcceptsRow( int row, const QModelIndex &parent ) const
    {
      const QModelIndex index = sourceModel()->index( row, Akonadi::ContactCompletionModel::EmailColumn, parent );
      if ( !index.isValid() ) {
        return false;
      }

      return !index.data().toString().isEmpty();
    }
};

ContactLineEdit::ContactLineEdit( bool isReference, QWidget *parent )
  : KLineEdit( parent ), mIsReference( isReference )
{
  setFrame( false );

  ContactsWithEmailFilterModel *filter = new ContactsWithEmailFilterModel( this );
  filter->setSourceModel( Akonadi::ContactCompletionModel::self() );

  QCompleter *completer = new QCompleter( filter, this );
  completer->setCompletionColumn( Akonadi::ContactCompletionModel::NameColumn );
  completer->setCaseSensitivity( Qt::CaseInsensitive );
  connect( completer, SIGNAL(activated(QModelIndex)), SLOT(completed(QModelIndex)) );

  setCompleter( completer );

  connect( this, SIGNAL(textEdited(QString)), SLOT(slotTextEdited()) );
}

bool ContactLineEdit::isReference() const
{
  return mIsReference;
}

Akonadi::Item ContactLineEdit::completedItem() const
{
  return mItem;
}

void ContactLineEdit::completed( const QModelIndex &index )
{
  if ( index.isValid() ) {
    mItem = index.data( Akonadi::EntityTreeModel::ItemRole ).value<Akonadi::Item>();
    mIsReference = true;
  } else {
    mItem = Item();
    mIsReference = false;
  }

  emit completed( this );
}

void ContactLineEdit::slotTextEdited()
{
  // if the user has edited the text, we break up the reference
  mIsReference = false;
}

class ContactGroupEditorDelegate::Private
{
  public:
    Private()
      : mButtonSize( 16, 16 ), mIcon( QLatin1String( "list-remove" ) ), mItemView( 0 )
    {
    }

    QSize mButtonSize;
    const KIcon mIcon;
    QAbstractItemView *mItemView;
};

ContactGroupEditorDelegate::ContactGroupEditorDelegate( QAbstractItemView *view, QObject *parent )
  : QStyledItemDelegate( parent ), d( new Private )
{
  d->mItemView = view;
}

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

QWidget* ContactGroupEditorDelegate::createEditor( QWidget *parent, const QStyleOptionViewItem&,
                                                   const QModelIndex &index ) const
{
  if ( index.column() == 0 ) {
    ContactLineEdit *edit = 0;
    if ( index.data( ContactGroupModel::IsReferenceRole ).toBool() ) {
      edit = new ContactLineEdit( true, parent );
    } else {
      edit = new ContactLineEdit( false, parent );
    }

    connect( edit, SIGNAL(completed(QWidget*)), SLOT(completed(QWidget*)) );

    return edit;
  } else {
    if ( index.data( ContactGroupModel::IsReferenceRole ).toBool() ) {
      KComboBox *comboBox = new KComboBox( parent );
      comboBox->setFrame( false );
      comboBox->setAutoFillBackground( true );
      return comboBox;
    } else {
      KLineEdit *lineEdit = new KLineEdit( parent );
      lineEdit->setFrame( false );
      return lineEdit;
    }
  }
}

void ContactGroupEditorDelegate::setEditorData( QWidget *editor, const QModelIndex &index ) const
{
  if ( index.data( ContactGroupModel::IsReferenceRole ).toBool() ) {
    if ( index.column() == 0 ) {
      KLineEdit *lineEdit = qobject_cast<KLineEdit*>( editor );
      if ( !lineEdit ) {
        return;
      }

      lineEdit->setText( index.data( Qt::EditRole ).toString() );
    } else {
      KComboBox *comboBox = qobject_cast<KComboBox*>( editor );
      if ( !comboBox ) {
        return;
      }

      const QStringList emails = index.data( ContactGroupModel::AllEmailsRole ).toStringList();
      comboBox->clear();
      comboBox->addItems( emails );
      comboBox->setCurrentIndex( comboBox->findText( index.data( Qt::EditRole ).toString() ) );
    }
  } else {
      KLineEdit *lineEdit = qobject_cast<KLineEdit*>( editor );
      if ( !lineEdit ) {
        return;
      }

      lineEdit->setText( index.data( Qt::EditRole ).toString() );
  }
}

void ContactGroupEditorDelegate::setModelData( QWidget *editor, QAbstractItemModel *model, const QModelIndex &index ) const
{
  if ( index.data( ContactGroupModel::IsReferenceRole ).toBool() ) {
    if ( index.column() == 0 ) {
      ContactLineEdit *lineEdit = static_cast<ContactLineEdit*>( editor );

      const bool isReference = lineEdit->isReference();
      const Item item = lineEdit->completedItem();
      model->setData( index, isReference, ContactGroupModel::IsReferenceRole );
      if ( isReference ) {
        if ( item.isValid() ) {
          model->setData( index, item.id(), Qt::EditRole );
        }
      } else {
        model->setData( index, lineEdit->text(), Qt::EditRole );
      }
    }

    if ( index.column() == 1 ) {
      KComboBox *comboBox = qobject_cast<KComboBox*>( editor );
      if ( !comboBox ) {
        return;
      }

      model->setData( index, comboBox->currentText(), Qt::EditRole );
    }
  } else {
    if ( index.column() == 0 ) {
      ContactLineEdit *lineEdit = static_cast<ContactLineEdit*>( editor );

      const bool isReference = lineEdit->isReference();
      const Item item = lineEdit->completedItem();
      model->setData( index, isReference, ContactGroupModel::IsReferenceRole );
      if ( isReference ) {
        if ( item.isValid() ) {
          model->setData( index, item.id(), Qt::EditRole );
        }
      } else
        model->setData( index, lineEdit->text(), Qt::EditRole );
    }

    if ( index.column() == 1 ) {
      KLineEdit *lineEdit = qobject_cast<KLineEdit*>( editor );
      if ( !lineEdit ) {
        return;
      }

      model->setData( index, lineEdit->text(), Qt::EditRole );
    }
  }
}

static bool isLastRow( const QModelIndex &index )
{
  return ( index.row() == ( index.model()->rowCount() - 1 ) );
}

void ContactGroupEditorDelegate::paint( QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index ) const
{
  QStyledItemDelegate::paint( painter, option, index );

  if ( index.column() == 1 && !isLastRow( index ) ) {
    d->mIcon.paint( painter, option.rect, Qt::AlignRight );
  }
}

QSize ContactGroupEditorDelegate::sizeHint( const QStyleOptionViewItem& option, const QModelIndex& index ) const
{
  Q_UNUSED( option );

  QSize hint = QStyledItemDelegate::sizeHint( option, index );
  hint.setHeight( qMax( hint.height(), d->mButtonSize.height() ) );

  if ( index.column() == 1 ) {
    hint.setWidth( hint.width() + d->mButtonSize.width() );
  }

  return hint;
}

bool ContactGroupEditorDelegate::editorEvent( QEvent *event, QAbstractItemModel *model, const QStyleOptionViewItem &option, const QModelIndex &index )
{
  if ( index.column() == 1 && !isLastRow( index ) ) {
    if ( event->type() == QEvent::MouseButtonRelease ) {
      const QMouseEvent *mouseEvent = static_cast<QMouseEvent*>( event );
      QRect buttonRect = d->mItemView->visualRect( index );
      buttonRect.setLeft( buttonRect.right() - d->mButtonSize.width() );

      if ( buttonRect.contains( mouseEvent->pos() ) ) {
        model->removeRows( index.row(), 1 );
        QTimer::singleShot( 0, this, SLOT(setFirstColumnAsCurrent()) );
        return true;
      }
    }
  }
  return QStyledItemDelegate::editorEvent( event, model, option, index );
}

void ContactGroupEditorDelegate::completed( QWidget *widget )
{
  emit commitData( widget );
  emit closeEditor( widget );
}

void ContactGroupEditorDelegate::setFirstColumnAsCurrent()
{
  d->mItemView->setCurrentIndex( d->mItemView->model()->index( d->mItemView->currentIndex().row(), 0 ) );
}

#include "moc_contactgroupeditordelegate_p.cpp"