/*
  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 "contactswitcher.h"

#include <KLocalizedString>

#include <QAbstractItemView>
#include <QHBoxLayout>
#include <QLabel>
#include <QPushButton>

ContactSwitcher::ContactSwitcher( QWidget *parent )
    : QWidget( parent ), mView( 0 )
{
    QHBoxLayout *layout = new QHBoxLayout( this );

    mPreviousButton = new QPushButton( i18nc( "@action:button Previous contact", "Previous" ) );
    mPreviousButton->setToolTip(
                i18nc( "@info:tooltip", "Move to the previous contact in the list" ) );
    mPreviousButton->setWhatsThis(
                i18nc( "@info:whatsthis",
                       "Press this button to move to the previous contact in the list." ) );

    mNextButton = new QPushButton( i18nc( "@action:button Next contact", "Next" ) );
    mNextButton->setToolTip(
                i18nc( "@info:tooltip", "Move to the next contact in the list" ) );
    mNextButton->setWhatsThis(
                i18nc( "@info:whatsthis",
                       "Press this button to move to the next contact in the list." ) );

    mStatusLabel = new QLabel();

    layout->addWidget( mPreviousButton );
    layout->addWidget( mNextButton );
    layout->addStretch( 1 );
    layout->addWidget( mStatusLabel );

    connect( mPreviousButton, SIGNAL(clicked()), SLOT(previousClicked()) );
    connect( mNextButton, SIGNAL(clicked()), SLOT(nextClicked()) );
}

void ContactSwitcher::setView( QAbstractItemView *view )
{
    mView = view;

    Q_ASSERT_X( mView->model(), "ContactSwitcher::setView", "The view has no model set!" );

    connect( mView->model(), SIGNAL(layoutChanged()), SLOT(updateStatus()) );
    connect( mView->model(), SIGNAL(rowsInserted(QModelIndex,int,int)), SLOT(updateStatus()) );
    connect( mView->model(), SIGNAL(rowsRemoved(QModelIndex,int,int)), SLOT(updateStatus()) );
    connect( mView->selectionModel(), SIGNAL(selectionChanged(QItemSelection,QItemSelection)), SLOT(updateStatus()));

    updateStatus();
}

void ContactSwitcher::nextClicked()
{
    if ( !mView || !mView->model() ) {
        return;
    }

    const QModelIndex index = mView->selectionModel()->currentIndex();

    int row = 0;
    if ( index.isValid() ) {
        row = index.row() + 1;
    }

    mView->selectionModel()->setCurrentIndex( mView->model()->index( row, 0 ),
                                              QItemSelectionModel::Rows |
                                              QItemSelectionModel::ClearAndSelect );

    updateStatus();
}

void ContactSwitcher::previousClicked()
{
    if ( !mView || !mView->model() ) {
        return;
    }

    const QModelIndex index = mView->selectionModel()->currentIndex();

    int row = 0;
    if ( index.isValid() ) {
        row = index.row() - 1;
    }

    mView->selectionModel()->setCurrentIndex( mView->model()->index( row, 0 ),
                                              QItemSelectionModel::Rows |
                                              QItemSelectionModel::ClearAndSelect );

    updateStatus();
}

void ContactSwitcher::updateStatus()
{
    if ( !mView || !mView->model() ) {
        return;
    }

    const QModelIndex index = mView->selectionModel()->currentIndex();

    int row = 0;
    if ( index.isValid() ) {
        row = index.row();
    }

    mPreviousButton->setEnabled( row != 0 );
    mNextButton->setEnabled( row != ( mView->model()->rowCount() - 1 ) );

    mStatusLabel->setText( i18nc( "@info:status",
                                  "%1 out of %2", row + 1, mView->model()->rowCount() ) );
}