/*
  This file is part of Kontact.

  Copyright (c) 2003 Tobias Koenig <tokoe@kde.org>
  Copyright (c) 2005-2006,2008-2009 Allen Winter <winter@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.

  As a special exception, permission is given to link this program
  with any edition of Qt, and distribute the resulting executable,
  without including the source code for Qt in the source distribution.
*/

#include "apptsummarywidget.h"
#include "korganizerplugin.h"
#include "summaryeventinfo.h"

#include "korganizer/korganizerinterface.h"

#include <calendarsupport/utils.h>
#include <calendarsupport/calendarsingleton.h>

#include <Akonadi/Collection>
#include <Akonadi/Calendar/IncidenceChanger>

#include <KCalCore/Calendar>
#include <KCalCore/Event>

#include <KontactInterface/Core>

#include <KConfigGroup>
#include <KIconLoader>
#include <KLocalizedString>
#include <KMenu>
#include <KUrlLabel>

#include <QGridLayout>
#include <QLabel>
#include <QVBoxLayout>

ApptSummaryWidget::ApptSummaryWidget( KOrganizerPlugin *plugin, QWidget *parent )
  : KontactInterface::Summary( parent ), mPlugin( plugin )
{
  QVBoxLayout *mainLayout = new QVBoxLayout( this );
  mainLayout->setSpacing( 3 );
  mainLayout->setMargin( 3 );

  QWidget *header = createHeader(
    this, QLatin1String("view-calendar-upcoming-events"), i18n( "Upcoming Events" ) );
  mainLayout->addWidget( header );

  mLayout = new QGridLayout();
  mainLayout->addItem( mLayout );
  mLayout->setSpacing( 3 );
  mLayout->setRowStretch( 6, 1 );

  QStringList mimeTypes;
  mimeTypes << KCalCore::Event::eventMimeType();
  mCalendar = CalendarSupport::calendarSingleton();

  mChanger = new Akonadi::IncidenceChanger( parent );

  connect( mCalendar.data(), SIGNAL(calendarChanged()), this, SLOT(updateView()) );
  connect( mPlugin->core(), SIGNAL(dayChanged(QDate)), this, SLOT(updateView()) );

  // Update Configuration
  configUpdated();
}

ApptSummaryWidget::~ApptSummaryWidget()
{
}

void ApptSummaryWidget::configUpdated()
{
  KConfig config( QLatin1String("kcmapptsummaryrc") );

  KConfigGroup group = config.group( "Days" );
  mDaysAhead = group.readEntry( "DaysToShow", 7 );

  group = config.group( "Show" );
  mShowBirthdaysFromCal = group.readEntry( "BirthdaysFromCalendar", true );
  mShowAnniversariesFromCal = group.readEntry( "AnniversariesFromCalendar", true );

  group = config.group( "Groupware" );
  mShowMineOnly = group.readEntry( "ShowMineOnly", false );

  updateView();
}

void ApptSummaryWidget::updateView()
{
  qDeleteAll( mLabels );
  mLabels.clear();

  // The event print consists of the following fields:
  //  icon:start date:days-to-go:summary:time range
  // where,
  //   the icon is the typical event icon
  //   the start date is the event start date
  //   the days-to-go is the #days until the event starts
  //   the summary is the event summary
  //   the time range is the start-end time (only for non-floating events)

  QLabel *label = 0;
  int counter = 0;

  KIconLoader loader( QLatin1String("korganizer") );
  QPixmap pm = loader.loadIcon( QLatin1String("view-calendar-day"), KIconLoader::Small );
  QPixmap pmb = loader.loadIcon( QLatin1String("view-calendar-birthday"), KIconLoader::Small );
  QPixmap pma = loader.loadIcon( QLatin1String("view-calendar-wedding-anniversary"), KIconLoader::Small );

  QStringList uidList;
  SummaryEventInfo::setShowSpecialEvents( mShowBirthdaysFromCal,
                                          mShowAnniversariesFromCal );
  QDate currentDate = QDate::currentDate();

  SummaryEventInfo::List events = SummaryEventInfo::eventsForRange( currentDate, currentDate.addDays( mDaysAhead - 1 ), mCalendar.data() );

  foreach ( SummaryEventInfo *event, events ) {

    // Optionally, show only my Events
/*      if ( mShowMineOnly &&
          !KCalCore::CalHelper::isMyCalendarIncidence( mCalendarAdaptor, event->ev ) ) {
      continue;
    }
    TODO: CalHelper is deprecated, remove this?
*/

    KCalCore::Event::Ptr ev = event->ev;
    // print the first of the recurring event series only
    if ( ev->recurs() ) {
      if ( uidList.contains( ev->instanceIdentifier() ) ) {
        continue;
      }
      uidList.append( ev->instanceIdentifier() );
    }

    // Icon label
    label = new QLabel( this );
    if ( ev->categories().contains( QLatin1String("BIRTHDAY"), Qt::CaseInsensitive ) ) {
      label->setPixmap( pmb );
    } else if ( ev->categories().contains( QLatin1String("ANNIVERSARY"), Qt::CaseInsensitive ) ) {
      label->setPixmap( pma );
    } else {
      label->setPixmap( pm );
    }
    label->setMaximumWidth( label->minimumSizeHint().width() );
    mLayout->addWidget( label, counter, 0 );
    mLabels.append( label );

    // Start date or date span label
    QString dateToDisplay = event->startDate;
    if ( !event->dateSpan.isEmpty() ) {
      dateToDisplay = event->dateSpan;
    }
    label = new QLabel( dateToDisplay, this );
    label->setAlignment( Qt::AlignLeft | Qt::AlignVCenter );
    mLayout->addWidget( label, counter, 1 );
    mLabels.append( label );
    if ( event->makeBold ) {
      QFont font = label->font();
      font.setBold( true );
      label->setFont( font );
    }

    // Days to go label
    label = new QLabel( event->daysToGo, this );
    label->setAlignment( Qt::AlignLeft | Qt::AlignVCenter );
    mLayout->addWidget( label, counter, 2 );
    mLabels.append( label );

    // Summary label
    KUrlLabel *urlLabel = new KUrlLabel( this );
    urlLabel->setText( event->summaryText );
    urlLabel->setUrl( event->summaryUrl );
    urlLabel->installEventFilter( this );
    urlLabel->setTextFormat( Qt::RichText );
    urlLabel->setWordWrap( true );
    mLayout->addWidget( urlLabel, counter, 3 );
    mLabels.append( urlLabel );

    connect( urlLabel, SIGNAL(leftClickedUrl(QString)),
              this, SLOT(viewEvent(QString)) );
    connect( urlLabel, SIGNAL(rightClickedUrl(QString)),
              this, SLOT(popupMenu(QString)) );
    if ( !event->summaryTooltip.isEmpty() ) {
      urlLabel->setToolTip( event->summaryTooltip );
    }

    // Time range label (only for non-floating events)
    if ( !event->timeRange.isEmpty() ) {
      label = new QLabel( event->timeRange, this );
      label->setAlignment( Qt::AlignLeft | Qt::AlignVCenter );
      mLayout->addWidget( label, counter, 4 );
      mLabels.append( label );
    }

    counter++;
  }

  qDeleteAll( events );

  if ( !counter ) {
    QLabel *noEvents = new QLabel(
      i18np( "No upcoming events starting within the next day",
             "No upcoming events starting within the next %1 days",
             mDaysAhead ), this );
    noEvents->setAlignment( Qt::AlignHCenter | Qt::AlignVCenter );
    mLayout->addWidget( noEvents, 0, 0 );
    mLabels.append( noEvents );
  }

  Q_FOREACH ( label, mLabels ) { //krazy:exclude=foreach as label is a pointer
    label->show();
  }
}

void ApptSummaryWidget::viewEvent( const QString &uid )
{
  Akonadi::Item::Id id = mCalendar->item( uid ).id();

  if ( id != -1 ) {
    mPlugin->core()->selectPlugin( QLatin1String("kontact_korganizerplugin") ); //ensure loaded
    OrgKdeKorganizerKorganizerInterface korganizer(
      QLatin1String("org.kde.korganizer"), QLatin1String("/Korganizer"), QDBusConnection::sessionBus() );
    korganizer.editIncidence( QString::number( id ) );
  }
}

void ApptSummaryWidget::removeEvent( const Akonadi::Item &item )
{
  mChanger->deleteIncidence( item );
}

void ApptSummaryWidget::popupMenu( const QString &uid )
{
  KMenu popup( this );

  // FIXME: Should say "Show Appointment" if we don't have rights to edit
  // Doesn't make sense to edit events from birthday resource for example
  QAction *editIt = popup.addAction( i18n( "&Edit Appointment..." ) );

  QAction *delIt = popup.addAction( i18n( "&Delete Appointment" ) );
  delIt->setIcon( KIconLoader::global()->
                  loadIcon( QLatin1String("edit-delete"), KIconLoader::Small ) );

  Akonadi::Item item = mCalendar->item( uid );
  delIt->setEnabled( mCalendar->hasRight( item, Akonadi::Collection::CanDeleteItem ) );

  const QAction *selectedAction = popup.exec( QCursor::pos() );
  if ( selectedAction == editIt ) {
    viewEvent( uid );
  } else if ( selectedAction == delIt ) {
    removeEvent( item );
  }
}

bool ApptSummaryWidget::eventFilter( QObject *obj, QEvent *e )
{
  if ( obj->inherits( "KUrlLabel" ) ) {
    KUrlLabel *label = static_cast<KUrlLabel*>( obj );
    if ( e->type() == QEvent::Enter ) {
      emit message( i18n( "Edit Event: \"%1\"", label->text() ) );
    }
    if ( e->type() == QEvent::Leave ) {
      emit message( QString::null ); //krazy:exclude=nullstrassign for old broken gcc
    }
  }

  return KontactInterface::Summary::eventFilter( obj, e );
}

QStringList ApptSummaryWidget::configModules() const
{
  return QStringList()<< QLatin1String("kcmapptsummary.desktop");
}