/*
  SPDX-FileCopyrightText: 2009 Tobias Koenig <tokoe@kde.org>

  SPDX-License-Identifier: LGPL-2.0-or-later
*/

#include "contactswitcher.h"

#include <KLocalizedString>

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

ContactSwitcher::ContactSwitcher(QWidget *parent)
    : QWidget(parent)
    , mNextButton(new QPushButton(i18nc("@action:button Next contact", "Next"), this))
    , mPreviousButton(new QPushButton(i18nc("@action:button Previous contact", "Previous"), this))
    , mStatusLabel(new QLabel(this))
{
    auto layout = new QHBoxLayout(this);

    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->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."));

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

    connect(mPreviousButton, &QPushButton::clicked, this, &ContactSwitcher::previousClicked);
    connect(mNextButton, &QPushButton::clicked, this, &ContactSwitcher::nextClicked);
}

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

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

    connect(mView->model(), &QAbstractItemModel::layoutChanged, this, &ContactSwitcher::updateStatus);
    connect(mView->model(), &QAbstractItemModel::rowsInserted, this, &ContactSwitcher::updateStatus);
    connect(mView->model(), &QAbstractItemModel::rowsRemoved, this, &ContactSwitcher::updateStatus);
    connect(mView->selectionModel(), &QItemSelectionModel::selectionChanged, this, &ContactSwitcher::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((mView->model()->rowCount() != 0) && (row != (mView->model()->rowCount() - 1)));

    if (mView->model()->rowCount() > 0) {
        mStatusLabel->setText(i18nc("@info:status", "%1 out of %2", row + 1, mView->model()->rowCount()));
    } else {
        mStatusLabel->clear();
    }
}
