/*
    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 "displaynameeditwidget.h"

#include <QtCore/QEvent>
#include <QtCore/QString>
#include <QAbstractItemView>
#include <QHBoxLayout>
#include <QPainter>
#include <QStyledItemDelegate>

#include <kabc/addressee.h>
#include <kcombobox.h>
#include <kdialog.h>
#include <klocale.h>

// Tries to guess the display type that is used for the passed contact
static DisplayNameEditWidget::DisplayType guessedDisplayType( const KABC::Addressee &contact )
{
  if ( contact.formattedName() == (contact.givenName() + QLatin1Char( ' ' ) + contact.familyName()) )
    return DisplayNameEditWidget::SimpleName;
  else if ( contact.formattedName() == contact.assembledName() )
    return DisplayNameEditWidget::FullName;
  else if ( contact.formattedName() == (contact.familyName() + QLatin1String( ", " ) + contact.givenName()) )
    return DisplayNameEditWidget::ReverseNameWithComma;
  else if ( contact.formattedName() == (contact.familyName() + QLatin1Char( ' ' ) + contact.givenName()) )
    return DisplayNameEditWidget::ReverseName;
  else if ( contact.formattedName() == contact.organization() )
    return DisplayNameEditWidget::Organization;
  else
    return DisplayNameEditWidget::CustomName;
}

class DisplayNameDelegate : public QStyledItemDelegate
{
  public:
    DisplayNameDelegate( QAbstractItemView *view, QObject *parent = 0 )
      : QStyledItemDelegate( parent ), mMaxDescriptionWidth( 0 )
    {
      mDescriptions.append( i18n( "Short Name" ) );
      mDescriptions.append( i18n( "Full Name" ) );
      mDescriptions.append( i18n( "Reverse Name with Comma" ) );
      mDescriptions.append( i18n( "Reverse Name" ) );
      mDescriptions.append( i18n( "Organization" ) );
      mDescriptions.append( i18nc( "@item:inlistbox A custom name format", "Custom" ) );

      QFont font = view->font();
      font.setStyle( QFont::StyleItalic );
      QFontMetrics metrics( font );
      foreach ( const QString &description, mDescriptions )
        mMaxDescriptionWidth = qMax( mMaxDescriptionWidth, metrics.width( description ) );

      mMaxDescriptionWidth += 3;
    }

    int maximumDescriptionWidth() const
    {
      return mMaxDescriptionWidth;
    }

    virtual void paint( QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index ) const
    {
      QStyledItemDelegate::paint( painter, option, index );
      const QRect rect( option.rect.width() - mMaxDescriptionWidth, option.rect.y(), mMaxDescriptionWidth, option.rect.height() );
      painter->save();
      QFont font( painter->font() );
      font.setStyle( QFont::StyleItalic );
      painter->setFont( font );
      if ( option.state & QStyle::State_Selected )
        painter->setPen( option.palette.color( QPalette::Normal, QPalette::BrightText ) );
      else
        painter->setPen( option.palette.color( QPalette::Disabled, QPalette::Text ) );
      painter->drawText( rect, Qt::AlignLeft, mDescriptions.at( index.row() ) );
      painter->restore();
    }

    QSize sizeHint( const QStyleOptionViewItem& option, const QModelIndex& index ) const
    {
      QSize size = QStyledItemDelegate::sizeHint( option, index );
      size.setWidth( size.width() + mMaxDescriptionWidth );

      return size;
    }

  private:
    QStringList mDescriptions;
    int mMaxDescriptionWidth;
};

DisplayNameEditWidget::DisplayNameEditWidget( QWidget *parent )
  : QWidget( parent ),
    mDisplayType( FullName )
{
  QHBoxLayout *layout = new QHBoxLayout( this );
  layout->setMargin( 0 );
  layout->setSpacing( KDialog::spacingHint() );

  mView = new KComboBox( this );
  mView->addItems( QStringList() << QString() << QString() << QString()
                                 << QString() << QString() << QString() );

  layout->addWidget( mView );

  connect( mView, SIGNAL(activated(int)), SLOT(displayTypeChanged(int)) );

  DisplayNameDelegate *delegate = new DisplayNameDelegate( mView->view() );
  mView->view()->setItemDelegate( delegate );

  mAdditionalPopupWidth = delegate->maximumDescriptionWidth();

  mViewport = mView->view()->viewport();
  mViewport->installEventFilter( this );
}

DisplayNameEditWidget::~DisplayNameEditWidget()
{
}

void DisplayNameEditWidget::setReadOnly( bool readOnly )
{
  mView->setEnabled( !readOnly );
}

void DisplayNameEditWidget::setDisplayType( DisplayType type )
{
  if ( type == -1 ) {
    // guess the used display type
    mDisplayType = guessedDisplayType( mContact );
  } else
    mDisplayType = type;

  updateView();
}

DisplayNameEditWidget::DisplayType DisplayNameEditWidget::displayType() const
{
  return mDisplayType;
}

void DisplayNameEditWidget::loadContact( const KABC::Addressee &contact )
{
  mContact = contact;

  mDisplayType = guessedDisplayType( mContact );

  updateView();
}

void DisplayNameEditWidget::storeContact( KABC::Addressee &contact ) const
{
  contact.setFormattedName( mView->currentText() );
}

void DisplayNameEditWidget::changeName( const KABC::Addressee &contact )
{
  const QString organization = mContact.organization();
  mContact = contact;
  mContact.setOrganization( organization );
  if ( mDisplayType == CustomName )
    mContact.setFormattedName( mView->currentText() );

  updateView();
}

void DisplayNameEditWidget::changeOrganization( const QString &organization )
{
  mContact.setOrganization( organization );

  updateView();
}

void DisplayNameEditWidget::displayTypeChanged( int type )
{
  mDisplayType = (DisplayType)type;

  updateView();
}

bool DisplayNameEditWidget::eventFilter( QObject *object, QEvent *event )
{
  if ( object == mViewport ) {
    if ( event->type() == QEvent::Show ) {
      // retrieve the widget that contains the popup view
      QWidget *parentWidget = mViewport->parentWidget()->parentWidget();

      int maxWidth = 0;
      QFontMetrics metrics( mView->font() );
      for ( int i = 0; i < mView->count(); ++i )
        maxWidth = qMax( maxWidth, metrics.width( mView->itemText( i ) ) );

      // resize it to show the complete content
      parentWidget->resize( maxWidth + mAdditionalPopupWidth + 20, parentWidget->height() );
    }
    return false;
  }

  return eventFilter( object, event );
}

void DisplayNameEditWidget::updateView()
{
  // SimpleName:
  mView->setItemText( 0, mContact.givenName() + QLatin1Char( ' ' ) + mContact.familyName() );

  // FullName:
  mView->setItemText( 1, mContact.assembledName() );

  // ReverseNameWithComma:
  mView->setItemText( 2, mContact.familyName() + QLatin1String( ", " ) + mContact.givenName() );

  // ReverseName:
  mView->setItemText( 3, mContact.familyName() + QLatin1Char( ' ' ) + mContact.givenName() );

  // Organization:
  mView->setItemText( 4, mContact.organization() );

  // CustomName:
  mView->setItemText( 5, mContact.formattedName() );

  mView->setEditable( mDisplayType == CustomName );

  mView->setCurrentIndex( (int)mDisplayType );
}

