/*
  Copyright (c) 2015-2020 Laurent Montel <montel@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
*/
#include "invalidfilterlistitemdelegate.h"
#include "invalidfilterlistmodel.h"

#include <QIcon>
#include <QAbstractItemView>
#include <QPainter>
#include <QPushButton>
#include <QToolButton>
#include <QLabel>

using namespace MailCommon;

InvalidFilterListItemDelegate::InvalidFilterListItemDelegate(QAbstractItemView *itemView, QObject *parent)
    : KWidgetItemDelegate(itemView, parent)
{
}

InvalidFilterListItemDelegate::~InvalidFilterListItemDelegate()
{
}

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

    const QStyle *style = itemView()->style();
    const int buttonHeight = style->pixelMetric(QStyle::PM_ButtonMargin) * 2
                             +style->pixelMetric(QStyle::PM_ButtonIconSize);
    const int fontHeight = option.fontMetrics.height();
    return QSize(100, qMax(buttonHeight, fontHeight));
}

void InvalidFilterListItemDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const
{
    Q_UNUSED(index);
    painter->save();

    itemView()->style()->drawPrimitive(QStyle::PE_PanelItemViewItem, &option, painter);

    if (option.state & QStyle::State_Selected) {
        painter->setPen(option.palette.highlightedText().color());
    }

    painter->restore();
}

QList<QWidget *> InvalidFilterListItemDelegate::createItemWidgets(const QModelIndex &) const
{
    QLabel *label = new QLabel();
    QToolButton *showInformationToolButton = new QToolButton();
    connect(showInformationToolButton, &QAbstractButton::clicked, this, &InvalidFilterListItemDelegate::slotShowDetails);
    return QList<QWidget *>() << label << showInformationToolButton;
}

void InvalidFilterListItemDelegate::updateItemWidgets(const QList<QWidget *> widgets, const QStyleOptionViewItem &option, const QPersistentModelIndex &index) const
{
    QLabel *label = static_cast<QLabel *>(widgets[0]);
    const QAbstractItemModel *model = index.model();
    label->setText(model->data(index).toString());
    const QString details = model->data(index, InvalidFilterListModel::InformationRole).toString();

    QToolButton *showInformationToolButton = static_cast<QToolButton *>(widgets[1]);
    showInformationToolButton->setEnabled(!details.isEmpty());
    const int itemHeight = sizeHint(option, index).height();
    showInformationToolButton->setIcon(QIcon::fromTheme(QStringLiteral("help-hint")));
    showInformationToolButton->resize(showInformationToolButton->sizeHint());
    showInformationToolButton->move(option.rect.right() - showInformationToolButton->width(),
                                    (itemHeight - showInformationToolButton->height()) / 2);

    int labelWidth = option.rect.width();
    labelWidth -= showInformationToolButton->sizeHint().width();
    label->resize(labelWidth, label->sizeHint().height());
    label->move(0, (itemHeight - label->height()) / 2);
}

void InvalidFilterListItemDelegate::slotShowDetails()
{
    const QAbstractItemModel *model = focusedIndex().model();

    const QString information = model->data(focusedIndex(), InvalidFilterListModel::InformationRole).toString();
    if (!information.isEmpty()) {
        Q_EMIT showDetails(information);
    }
}
