/******************************************************************************
 *
 *  SPDX-FileCopyrightText: 2008 Szymon Tomasz Stefanek <pragma@kvirc.net>
 *
 *  SPDX-License-Identifier: GPL-2.0-or-later
 *
 *******************************************************************************/

#include "utils/themeeditor.h"
#include "core/groupheaderitem.h"
#include "core/manager.h"
#include "core/messageitem.h"
#include "core/modelinvariantrowmapper.h"
#include "utils/comboboxutils.h"

#include <Akonadi/MessageStatus>

#include <KTextEdit>

#include <QActionGroup>
#include <QCheckBox>
#include <QCursor>
#include <QDrag>
#include <QGridLayout>
#include <QGroupBox>
#include <QHeaderView>
#include <QMimeData>
#include <QMouseEvent>
#include <QPaintEvent>
#include <QPainter>
#include <QPixmap>
#include <QPushButton>
#include <QStringList>

#include <KIconLoader>
#include <KLocalizedString>
#include <KPluralHandlingSpinBox>
#include <QColorDialog>
#include <QComboBox>
#include <QLineEdit>
#include <QMenu>

#include <QDialogButtonBox>
#include <QVBoxLayout>
#include <ctime> // for time_t

using namespace MessageList::Utils;
using namespace MessageList::Core;

static const char gThemeContentItemTypeDndMimeDataFormat[] = "application/x-kmail-messagelistview-theme-contentitem-type";

ThemeColumnPropertiesDialog::ThemeColumnPropertiesDialog(QWidget *parent, Theme::Column *column, const QString &title)
    : QDialog(parent)
    , mColumn(column)
{
    auto mainLayout = new QVBoxLayout(this);
    auto buttonBox = new QDialogButtonBox(QDialogButtonBox::Ok | QDialogButtonBox::Cancel, this);
    QPushButton *okButton = buttonBox->button(QDialogButtonBox::Ok);
    okButton->setDefault(true);
    okButton->setShortcut(Qt::CTRL | Qt::Key_Return);
    connect(buttonBox, &QDialogButtonBox::rejected, this, &ThemeColumnPropertiesDialog::reject);
    setWindowTitle(title);

    auto base = new QWidget(this);
    mainLayout->addWidget(base);
    mainLayout->addWidget(buttonBox);

    auto g = new QGridLayout(base);

    auto l = new QLabel(i18nc("@label:textbox Property name", "Name:"), base);
    g->addWidget(l, 0, 0);

    mNameEdit = new QLineEdit(base);
    mNameEdit->setToolTip(i18n("The label that will be displayed in the column header."));
    g->addWidget(mNameEdit, 0, 1);

    l = new QLabel(i18n("Header click sorts messages:"), base);
    g->addWidget(l, 1, 0);

    mMessageSortingCombo = new QComboBox(base);
    mMessageSortingCombo->setToolTip(i18n("The sorting order that clicking on this column header will switch to."));
    g->addWidget(mMessageSortingCombo, 1, 1);

    mVisibleByDefaultCheck = new QCheckBox(i18n("Visible by default"), base);
    mVisibleByDefaultCheck->setToolTip(i18n("Check this if this column should be visible when the theme is selected."));
    g->addWidget(mVisibleByDefaultCheck, 2, 1);

    mIsSenderOrReceiverCheck = new QCheckBox(i18n("Contains \"Sender or Receiver\" field"), base);
    mIsSenderOrReceiverCheck->setToolTip(i18n("Check this if this column label should be updated depending on the folder \"inbound\"/\"outbound\" type."));
    g->addWidget(mIsSenderOrReceiverCheck, 3, 1);

    g->setColumnStretch(1, 1);
    g->setRowStretch(10, 1);

    connect(okButton, &QPushButton::clicked, this, &ThemeColumnPropertiesDialog::slotOkButtonClicked);

    // Display the current settings
    mNameEdit->setText(mColumn->label());
    mVisibleByDefaultCheck->setChecked(mColumn->visibleByDefault());
    mIsSenderOrReceiverCheck->setChecked(mColumn->isSenderOrReceiver());
    ComboBoxUtils::fillIntegerOptionCombo(mMessageSortingCombo, SortOrder::enumerateMessageSortingOptions(Aggregation::PerfectReferencesAndSubject));
    ComboBoxUtils::setIntegerOptionComboValue(mMessageSortingCombo, mColumn->messageSorting());
}

void ThemeColumnPropertiesDialog::slotOkButtonClicked()
{
    QString text = mNameEdit->text();
    if (text.isEmpty()) {
        text = i18n("Unnamed Column");
    }
    mColumn->setLabel(text);
    mColumn->setVisibleByDefault(mVisibleByDefaultCheck->isChecked());
    mColumn->setIsSenderOrReceiver(mIsSenderOrReceiverCheck->isChecked());
    mColumn->setMessageSorting(
        static_cast<SortOrder::MessageSorting>(ComboBoxUtils::getIntegerOptionComboValue(mMessageSortingCombo, SortOrder::NoMessageSorting)));

    accept();
}

ThemeContentItemSourceLabel::ThemeContentItemSourceLabel(QWidget *parent, Theme::ContentItem::Type type)
    : QLabel(parent)
    , mType(type)
{
    setFrameStyle(QFrame::StyledPanel | QFrame::Raised);
}

ThemeContentItemSourceLabel::~ThemeContentItemSourceLabel() = default;

MessageList::Core::Theme::ContentItem::Type ThemeContentItemSourceLabel::type() const
{
    return mType;
}

void ThemeContentItemSourceLabel::mousePressEvent(QMouseEvent *e)
{
    if (e->button() == Qt::LeftButton) {
        mMousePressPoint = e->pos();
    }
}

void ThemeContentItemSourceLabel::mouseMoveEvent(QMouseEvent *e)
{
    if (e->buttons() & Qt::LeftButton) {
        const QPoint diff = mMousePressPoint - e->pos();
        if (diff.manhattanLength() > 4) {
            startDrag();
        }
    }
}

void ThemeContentItemSourceLabel::startDrag()
{
    // QPixmap pix = QPixmap::grabWidget( this );
    // QPixmap alpha( pix.width(), pix.height() );
    // alpha.fill(0x0f0f0f0f);
    // pix.setAlphaChannel( alpha ); // <-- this crashes... no alpha for dragged pixmap :(
    auto data = new QMimeData();
    QByteArray arry;
    arry.resize(sizeof(Theme::ContentItem::Type));
    *((Theme::ContentItem::Type *)arry.data()) = mType;
    data->setData(QLatin1String(gThemeContentItemTypeDndMimeDataFormat), arry);
    auto drag = new QDrag(this);
    drag->setMimeData(data);
    // drag->setPixmap( pix );
    // drag->setHotSpot( mapFromGlobal( QCursor::pos() ) );
    drag->exec(Qt::CopyAction, Qt::CopyAction);
}

ThemePreviewDelegate::ThemePreviewDelegate(QAbstractItemView *parent)
    : ThemeDelegate(parent)
{
    mRowMapper = new ModelInvariantRowMapper();

    mSampleGroupHeaderItem = new GroupHeaderItem(i18n("Message Group"));

    mSampleGroupHeaderItem->setDate(time(nullptr));
    mSampleGroupHeaderItem->setMaxDate(time(nullptr) + 31337);
    mSampleGroupHeaderItem->setSubject(i18n("Very long subject very long subject very long subject very long subject very long subject very long"));

    mSampleMessageItem = new FakeItem();

    mSampleMessageItem->setDate(time(nullptr));
    mSampleMessageItem->setSize(0x31337);
    mSampleMessageItem->setMaxDate(time(nullptr) + 31337);
    mSampleMessageItem->setSender(i18n("Sender"));
    mSampleMessageItem->setReceiver(i18n("Receiver"));
    mSampleMessageItem->setSubject(i18n("Very long subject very long subject very long subject very long subject very long subject very long"));
    mSampleMessageItem->setFolder(i18n("Folder"));
    mSampleMessageItem->setSignatureState(MessageItem::FullySigned);
    mSampleMessageItem->setEncryptionState(MessageItem::FullyEncrypted);

    QList<MessageItem::Tag *> list;
    list.append(new MessageItem::Tag(QIcon::fromTheme(QStringLiteral("feed-subscribe")).pixmap(KIconLoader::SizeSmall), i18n("Sample Tag 1"), QString()));
    list.append(new MessageItem::Tag(QIcon::fromTheme(QStringLiteral("feed-subscribe")).pixmap(KIconLoader::SizeSmall), i18n("Sample Tag 2"), QString()));
    list.append(new MessageItem::Tag(QIcon::fromTheme(QStringLiteral("feed-subscribe")).pixmap(KIconLoader::SizeSmall), i18n("Sample Tag 3"), QString()));
    mSampleMessageItem->setFakeTags(list);

    mRowMapper->createModelInvariantIndex(0, mSampleMessageItem);

    mSampleGroupHeaderItem->rawAppendChildItem(mSampleMessageItem);
    mSampleMessageItem->setParent(mSampleGroupHeaderItem);

    Akonadi::MessageStatus stat;

    stat.fromQInt32(0x7fffffff);
    stat.setQueued(false);
    stat.setSent(false);
    stat.setSpam(true);
    stat.setWatched(true);
    stat.setHasInvitation();
    // stat.setHasAttachment( false );

    mSampleMessageItem->setStatus(stat);
}

ThemePreviewDelegate::~ThemePreviewDelegate()
{
    delete mSampleGroupHeaderItem;
    // delete mSampleMessageItem; (deleted by the parent)
    delete mRowMapper;
}

Item *ThemePreviewDelegate::itemFromIndex(const QModelIndex &index) const
{
    if (index.parent().isValid()) {
        return mSampleMessageItem;
    }

    return mSampleGroupHeaderItem;
}

ThemePreviewWidget::ThemePreviewWidget(QWidget *parent)
    : QTreeWidget(parent)
    , mTheme(nullptr)
{
    mSelectedThemeContentItem = nullptr;
    mSelectedThemeColumn = nullptr;
    mFirstShow = true;
    mReadOnly = false;

    mDelegate = new ThemePreviewDelegate(this);
    setItemDelegate(mDelegate);
    setRootIsDecorated(false);
    viewport()->setAcceptDrops(true);

    header()->setContextMenuPolicy(Qt::CustomContextMenu); // make sure it's true
    connect(header(), &QWidget::customContextMenuRequested, this, &ThemePreviewWidget::slotHeaderContextMenuRequested);

    mGroupHeaderSampleItem = new QTreeWidgetItem(this);
    mGroupHeaderSampleItem->setText(0, QString());
    mGroupHeaderSampleItem->setFlags(Qt::ItemIsEnabled);

    auto m = new QTreeWidgetItem(mGroupHeaderSampleItem);
    m->setText(0, QString());

    mGroupHeaderSampleItem->setExpanded(true);
    header()->setSectionsMovable(false);
}

void ThemePreviewWidget::changeEvent(QEvent *event)
{
    if (event->type() == QEvent::FontChange) {
        mDelegate->generalFontChanged();
    }
    QTreeWidget::changeEvent(event);
}

ThemePreviewWidget::~ThemePreviewWidget() = default;

QSize ThemePreviewWidget::sizeHint() const
{
    return {350, 180};
}

void ThemePreviewWidget::setReadOnly(bool readOnly)
{
    mReadOnly = readOnly;
}

void ThemePreviewWidget::applyThemeColumnWidths()
{
    if (!mTheme) {
        return;
    }

    const QList<Theme::Column *> &columns = mTheme->columns();

    if (columns.isEmpty()) {
        viewport()->update(); // trigger a repaint
        return;
    }

    // Now we want to distribute the available width on all the columns.
    // The algorithm used here is very similar to the one used in View::applyThemeColumns().
    // It just takes care of ALL the columns instead of the visible ones.

    QList<Theme::Column *>::ConstIterator it;

    // Gather size hints for all sections.
    int idx = 0;
    int totalVisibleWidthHint = 0;
    QList<Theme::Column *>::ConstIterator end(columns.constEnd());

    for (it = columns.constBegin(); it != end; ++it) {
        totalVisibleWidthHint += mDelegate->sizeHintForItemTypeAndColumn(Item::Message, idx).width();
        idx++;
    }

    if (totalVisibleWidthHint < 16) {
        totalVisibleWidthHint = 16; // be reasonable
    }

    // Now we can compute proportional widths.

    idx = 0;

    QList<int> realWidths;
    realWidths.reserve(columns.count());
    int totalVisibleWidth = 0;

    end = columns.constEnd();
    for (it = columns.constBegin(); it != end; ++it) {
        int hintWidth = mDelegate->sizeHintForItemTypeAndColumn(Item::Message, idx).width();
        int realWidth;
        if ((*it)->containsTextItems()) {
            // the column contains text items, it should get more space
            realWidth = ((hintWidth * viewport()->width()) / totalVisibleWidthHint) - 2; // -2 is heuristic
            if (realWidth < (hintWidth + 2)) {
                realWidth = hintWidth + 2; // can't be less
            }
        } else {
            // the column contains no text items, it should get just a little bit more than its sizeHint().
            realWidth = hintWidth + 2;
        }

        realWidths.append(realWidth);
        totalVisibleWidth += realWidth;

        idx++;
    }

    idx = 0;

    totalVisibleWidth += 4; // account for some view's border

    if (totalVisibleWidth < viewport()->width()) {
        // give the additional space to the text columns
        // also give more space to the first ones and less space to the last ones
        int available = viewport()->width() - totalVisibleWidth;

        for (it = columns.begin(); it != columns.end(); ++it) {
            if (((*it)->visibleByDefault() || (idx == 0)) && (*it)->containsTextItems()) {
                // give more space to this column
                available >>= 1; // eat half of the available space
                realWidths[idx] += available; // and give it to this column
            }

            idx++;
        }

        // if any space is still available, give it to the first column
        if (available) {
            realWidths[0] += available;
        }
    }

    idx = 0;

    // We're ready.
    // Assign widths. Hide the sections that are not visible by default, show the other ones.
    for (it = columns.begin(); it != columns.end(); ++it) {
        header()->resizeSection(idx, realWidths[idx]);
        idx++;
    }

#if 0
    if (mTheme->viewHeaderPolicy() == Theme::NeverShowHeader) {
        header()->hide();
    } else {
        header()->show();
    }
#endif
}

void ThemePreviewWidget::setTheme(Theme *theme)
{
    bool themeChanged = theme != mTheme;

    mSelectedThemeContentItem = nullptr;
    mThemeSelectedContentItemRect = QRect();
    mDropIndicatorPoint1 = QPoint();
    mDropIndicatorPoint2 = QPoint();
    mTheme = theme;
    mDelegate->setTheme(theme);
    if (!mTheme) {
        return;
    }
    mGroupHeaderSampleItem->setExpanded(true);

    const QList<Theme::Column *> &columns = mTheme->columns();

    setColumnCount(columns.count());

    QStringList headerLabels;
    headerLabels.reserve(columns.count());
    QList<Theme::Column *>::ConstIterator end(columns.constEnd());
    for (QList<Theme::Column *>::ConstIterator it = columns.constBegin(); it != end; ++it) {
        QString label = (*it)->label();
        if ((*it)->visibleByDefault()) {
            label += QStringLiteral(" (%1)").arg(i18nc("Indicates whether or not a header label is visible", "Visible"));
        }

        headerLabels.append(label);
    }

    setHeaderLabels(headerLabels);

    if (themeChanged) {
        applyThemeColumnWidths();
    }

    viewport()->update(); // trigger a repaint
}

void ThemePreviewWidget::internalHandleDragEnterEvent(QDragEnterEvent *e)
{
    e->ignore();

    if (!e->mimeData()) {
        return;
    }
    if (!e->mimeData()->hasFormat(QLatin1String(gThemeContentItemTypeDndMimeDataFormat))) {
        return;
    }

    e->accept();
}

void ThemePreviewWidget::showEvent(QShowEvent *e)
{
    QTreeWidget::showEvent(e);

    if (mFirstShow) {
        // Make sure we re-apply column widths the first time we're shown.
        // The first "apply" call was made while the widget was still hidden and
        // almost surely had wrong sizes.
        applyThemeColumnWidths();
        mFirstShow = false;
    }
}

void ThemePreviewWidget::dragEnterEvent(QDragEnterEvent *e)
{
    internalHandleDragEnterEvent(e);

    mThemeSelectedContentItemRect = QRect();

    viewport()->update(); // trigger a repaint
}

void ThemePreviewWidget::internalHandleDragMoveEvent(QDragMoveEvent *e)
{
    e->ignore();

    if (mReadOnly) {
        return;
    }

    if (!e->mimeData()) {
        return;
    }
    if (!e->mimeData()->hasFormat(QLatin1String(gThemeContentItemTypeDndMimeDataFormat))) {
        return;
    }

    QByteArray arry = e->mimeData()->data(QLatin1String(gThemeContentItemTypeDndMimeDataFormat));

    if (arry.size() != sizeof(Theme::ContentItem::Type)) {
        return; // ugh
    }

    Theme::ContentItem::Type type = *((Theme::ContentItem::Type *)arry.data());

    if (!computeContentItemInsertPosition(e->pos(), type)) {
        return;
    }

    e->accept();
}

void ThemePreviewWidget::dragMoveEvent(QDragMoveEvent *e)
{
    if (mReadOnly) {
        return;
    }

    internalHandleDragMoveEvent(e);

    mThemeSelectedContentItemRect = QRect();

    viewport()->update(); // trigger a repaint
}

void ThemePreviewWidget::dropEvent(QDropEvent *e)
{
    mDropIndicatorPoint1 = mDropIndicatorPoint2;

    e->ignore();

    if (mReadOnly) {
        return;
    }

    if (!e->mimeData()) {
        return;
    }

    if (!e->mimeData()->hasFormat(QLatin1String(gThemeContentItemTypeDndMimeDataFormat))) {
        return;
    }

    QByteArray arry = e->mimeData()->data(QLatin1String(gThemeContentItemTypeDndMimeDataFormat));

    if (arry.size() != sizeof(Theme::ContentItem::Type)) {
        return; // ugh
    }

    Theme::ContentItem::Type type = *((Theme::ContentItem::Type *)arry.data());

    if (!computeContentItemInsertPosition(e->pos(), type)) {
        viewport()->update();
        return;
    }

    Theme::Row *row = nullptr;

    switch (mRowInsertPosition) {
    case AboveRow:
        row = new Theme::Row();
        if (mDelegate->hitItem()->type() == Item::Message) {
            const_cast<Theme::Column *>(mDelegate->hitColumn())->insertMessageRow(mDelegate->hitRowIndex(), row);
        } else {
            const_cast<Theme::Column *>(mDelegate->hitColumn())->insertGroupHeaderRow(mDelegate->hitRowIndex(), row);
        }
        break;
    case InsideRow:
        row = const_cast<Theme::Row *>(mDelegate->hitRow());
        break;
    case BelowRow:
        row = new Theme::Row();
        if (mDelegate->hitItem()->type() == Item::Message) {
            const_cast<Theme::Column *>(mDelegate->hitColumn())->insertMessageRow(mDelegate->hitRowIndex() + 1, row);
        } else {
            const_cast<Theme::Column *>(mDelegate->hitColumn())->insertGroupHeaderRow(mDelegate->hitRowIndex() + 1, row);
        }
        break;
    }

    if (!row) {
        return;
    }

    auto ci = new Theme::ContentItem(type);
    if (ci->canBeDisabled()) {
        if (ci->isClickable()) {
            ci->setSoftenByBlendingWhenDisabled(true); // default to softened
        } else {
            ci->setHideWhenDisabled(true); // default to hidden
        }
    }

    int idx;

    switch (mItemInsertPosition) {
    case OnLeftOfItem:
        if (!mDelegate->hitContentItem()) {
            // bleah
            delete ci;
            return;
        }
        idx = mDelegate->hitContentItemRight() ? row->rightItems().indexOf(const_cast<Theme::ContentItem *>(mDelegate->hitContentItem()))
                                               : row->leftItems().indexOf(const_cast<Theme::ContentItem *>(mDelegate->hitContentItem()));
        if (idx < 0) {
            // bleah
            delete ci;
            return;
        }
        if (mDelegate->hitContentItemRight()) {
            row->insertRightItem(idx + 1, ci);
        } else {
            row->insertLeftItem(idx, ci);
        }
        break;
    case OnRightOfItem:
        if (!mDelegate->hitContentItem()) {
            // bleah
            delete ci;
            return;
        }
        idx = mDelegate->hitContentItemRight() ? row->rightItems().indexOf(const_cast<Theme::ContentItem *>(mDelegate->hitContentItem()))
                                               : row->leftItems().indexOf(const_cast<Theme::ContentItem *>(mDelegate->hitContentItem()));
        if (idx < 0) {
            // bleah
            delete ci;
            return;
        }
        if (mDelegate->hitContentItemRight()) {
            row->insertRightItem(idx, ci);
        } else {
            row->insertLeftItem(idx + 1, ci);
        }
        break;
    case AsLastLeftItem:
        row->addLeftItem(ci);
        break;
    case AsLastRightItem:
        row->addRightItem(ci);
        break;
    case AsFirstLeftItem:
        row->insertLeftItem(0, ci);
        break;
    case AsFirstRightItem:
        row->insertRightItem(0, ci);
        break;
    default: // should never happen
        row->addRightItem(ci);
        break;
    }

    e->acceptProposedAction();

    mThemeSelectedContentItemRect = QRect();
    mDropIndicatorPoint1 = mDropIndicatorPoint2;
    mSelectedThemeContentItem = nullptr;

    setTheme(mTheme); // this will reset theme cache and trigger a global update
}

bool ThemePreviewWidget::computeContentItemInsertPosition(const QPoint &pos, Theme::ContentItem::Type type)
{
    mDropIndicatorPoint1 = mDropIndicatorPoint2; // this marks the position as invalid

    if (!mDelegate->hitTest(pos, false)) {
        return false;
    }

    if (!mDelegate->hitRow()) {
        return false;
    }

    if (mDelegate->hitRowIsMessageRow()) {
        if (!Theme::ContentItem::applicableToMessageItems(type)) {
            return false;
        }
    } else {
        if (!Theme::ContentItem::applicableToGroupHeaderItems(type)) {
            return false;
        }
    }

    QRect rowRect = mDelegate->hitRowRect();

    if (pos.y() < rowRect.top() + 3) {
        // above a row
        mRowInsertPosition = AboveRow;
        if (pos.x() < (rowRect.left() + (rowRect.width() / 2))) {
            mDropIndicatorPoint1 = rowRect.topLeft();
            mItemInsertPosition = AsLastLeftItem;
        } else {
            mDropIndicatorPoint1 = rowRect.topRight();
            mItemInsertPosition = AsLastRightItem;
        }
        mDropIndicatorPoint2 = QPoint(rowRect.left() + (rowRect.width() / 2), rowRect.top());
        return true;
    }

    if (pos.y() > rowRect.bottom() - 3) {
        // below a row
        mRowInsertPosition = BelowRow;
        if (pos.x() < (rowRect.left() + (rowRect.width() / 2))) {
            mDropIndicatorPoint1 = rowRect.bottomLeft();
            mItemInsertPosition = AsLastLeftItem;
        } else {
            mDropIndicatorPoint1 = rowRect.bottomRight();
            mItemInsertPosition = AsLastRightItem;
        }
        mDropIndicatorPoint2 = QPoint(rowRect.left() + (rowRect.width() / 2), rowRect.bottom());
        return true;
    }

    mRowInsertPosition = InsideRow;

    if (!mDelegate->hitContentItem()) {
        // didn't hit anything... probably no items in the row
        if (pos.x() < (rowRect.left() + (rowRect.width() / 2))) {
            mItemInsertPosition = AsLastLeftItem;
            mDropIndicatorPoint1 = QPoint(rowRect.left(), rowRect.top());
            mDropIndicatorPoint2 = QPoint(rowRect.left(), rowRect.bottom());
        } else {
            mItemInsertPosition = AsLastRightItem;
            mDropIndicatorPoint1 = QPoint(rowRect.right(), rowRect.top());
            mDropIndicatorPoint2 = QPoint(rowRect.right(), rowRect.bottom());
        }
        return true;
    }

    // hit something, maybe inexactly
    QRect itemRect = mDelegate->hitContentItemRect();

    if (!itemRect.contains(pos)) {
        // inexact hit: outside an item
        if (pos.x() > itemRect.right()) {
            // right side of an item
            if (mDelegate->hitRow()->rightItems().count() < 1) {
                // between the last left item and the right side
                if (pos.x() > (itemRect.right() + ((rowRect.right() - itemRect.right()) / 2))) {
                    // first/last right item
                    mItemInsertPosition = AsFirstRightItem;
                    mDropIndicatorPoint1 = rowRect.topRight();
                    mDropIndicatorPoint2 = rowRect.bottomRight();
                }
                return true;
            }
            // either there were some right items (so the theme delegate knows that the reported item is the closest)
            // or there were no right items but the position is closest to the left item than the right row end
            mItemInsertPosition = OnRightOfItem;
            mDropIndicatorPoint1 = itemRect.topRight();
            mDropIndicatorPoint2 = itemRect.bottomRight();
            return true;
        }

        // left side of an item
        if (mDelegate->hitRow()->leftItems().count() < 1) {
            // between the left side and the leftmost right item
            if (pos.x() < (itemRect.left() - ((itemRect.left() - rowRect.left()) / 2))) {
                mItemInsertPosition = AsFirstLeftItem;
                mDropIndicatorPoint1 = rowRect.topLeft();
                mDropIndicatorPoint2 = rowRect.bottomLeft();
                return true;
            }
        }
        mItemInsertPosition = OnLeftOfItem;
        mDropIndicatorPoint1 = itemRect.topLeft();
        mDropIndicatorPoint2 = itemRect.bottomLeft();
        return true;
    }

    // exact hit
    if (pos.x() < (itemRect.left() + (itemRect.width() / 2))) {
        // left side
        mItemInsertPosition = OnLeftOfItem;
        mDropIndicatorPoint1 = itemRect.topLeft();
        mDropIndicatorPoint2 = itemRect.bottomLeft();
        return true;
    }

    // right side
    mItemInsertPosition = OnRightOfItem;
    mDropIndicatorPoint1 = itemRect.topRight();
    mDropIndicatorPoint2 = itemRect.bottomRight();
    return true;
}

void ThemePreviewWidget::mouseMoveEvent(QMouseEvent *e)
{
    if (!(mSelectedThemeContentItem && (e->buttons() & Qt::LeftButton)) || mReadOnly) {
        QTreeWidget::mouseMoveEvent(e);
        return;
    }

    if (mSelectedThemeContentItem != mDelegate->hitContentItem()) {
        QTreeWidget::mouseMoveEvent(e);
        return; // ugh.. something weird happened
    }

    // starting a drag ?
    const QPoint diff = e->pos() - mMouseDownPoint;
    if (diff.manhattanLength() <= 4) {
        QTreeWidget::mouseMoveEvent(e);
        return; // ugh.. something weird happened
    }

    // starting a drag
    auto data = new QMimeData();
    QByteArray arry;
    arry.resize(sizeof(Theme::ContentItem::Type));
    *((Theme::ContentItem::Type *)arry.data()) = mSelectedThemeContentItem->type();
    data->setData(QLatin1String(gThemeContentItemTypeDndMimeDataFormat), arry);
    auto drag = new QDrag(this);
    drag->setMimeData(data);

    // remove the Theme::ContentItem from the Theme
    if (mDelegate->hitContentItemRight()) {
        const_cast<Theme::Row *>(mDelegate->hitRow())->removeRightItem(mSelectedThemeContentItem);
    } else {
        const_cast<Theme::Row *>(mDelegate->hitRow())->removeLeftItem(mSelectedThemeContentItem);
    }

    delete mSelectedThemeContentItem;

    if (mDelegate->hitRow()->rightItems().isEmpty() && mDelegate->hitRow()->leftItems().isEmpty()) {
        if (mDelegate->hitItem()->type() == Item::Message) {
            if (mDelegate->hitColumn()->messageRows().count() > 1) {
                const_cast<Theme::Column *>(mDelegate->hitColumn())->removeMessageRow(const_cast<Theme::Row *>(mDelegate->hitRow()));
                delete mDelegate->hitRow();
            }
        } else {
            if (mDelegate->hitColumn()->groupHeaderRows().count() > 1) {
                const_cast<Theme::Column *>(mDelegate->hitColumn())->removeGroupHeaderRow(const_cast<Theme::Row *>(mDelegate->hitRow()));
                delete mDelegate->hitRow();
            }
        }
    }

    mSelectedThemeContentItem = nullptr;
    mThemeSelectedContentItemRect = QRect();
    mDropIndicatorPoint1 = mDropIndicatorPoint2;

    setTheme(mTheme); // this will reset theme cache and trigger a global update

    // and do drag
    drag->exec(Qt::CopyAction, Qt::CopyAction);
}

void ThemePreviewWidget::mousePressEvent(QMouseEvent *e)
{
    if (mReadOnly) {
        QTreeWidget::mousePressEvent(e);
        return;
    }

    mMouseDownPoint = e->pos();

    if (mDelegate->hitTest(mMouseDownPoint)) {
        mSelectedThemeContentItem = const_cast<Theme::ContentItem *>(mDelegate->hitContentItem());
        mThemeSelectedContentItemRect = mSelectedThemeContentItem ? mDelegate->hitContentItemRect() : QRect();
    } else {
        mSelectedThemeContentItem = nullptr;
        mThemeSelectedContentItemRect = QRect();
    }

    QTreeWidget::mousePressEvent(e);
    viewport()->update();

    if (e->button() == Qt::RightButton) {
        QMenu menu;

        if (mSelectedThemeContentItem) {
            menu.addSection(Theme::ContentItem::description(mSelectedThemeContentItem->type()));

            if (mSelectedThemeContentItem->displaysText()) {
                QAction *act = menu.addAction(i18nc("@action:inmenu soften the text color", "Soften"));
                act->setCheckable(true);
                act->setChecked(mSelectedThemeContentItem->softenByBlending());
                connect(act, &QAction::triggered, this, &ThemePreviewWidget::slotSoftenActionTriggered);

                auto childmenu = new QMenu(&menu);

                act = childmenu->addAction(i18nc("@action:inmenu Font setting", "Bold"));
                act->setData(QVariant(static_cast<int>(Theme::ContentItem::IsBold)));
                act->setCheckable(true);
                act->setChecked(mSelectedThemeContentItem->isBold());
                act = childmenu->addAction(i18nc("@action:inmenu Font setting", "Italic"));
                act->setData(QVariant(static_cast<int>(Theme::ContentItem::IsItalic)));
                act->setCheckable(true);
                act->setChecked(mSelectedThemeContentItem->isItalic());

                connect(childmenu, &QMenu::triggered, this, &ThemePreviewWidget::slotFontMenuTriggered);

                menu.addMenu(childmenu)->setText(i18n("Font"));
            }

            if (mSelectedThemeContentItem->canUseCustomColor()) {
                auto childmenu = new QMenu(&menu);

                auto grp = new QActionGroup(childmenu);

                QAction *act = childmenu->addAction(i18nc("@action:inmenu Foreground color setting", "Default"));
                act->setData(QVariant(static_cast<int>(0)));
                act->setCheckable(true);
                act->setChecked(!mSelectedThemeContentItem->useCustomColor());
                grp->addAction(act);
                act = childmenu->addAction(i18nc("@action:inmenu Foreground color setting", "Custom..."));
                act->setData(QVariant(static_cast<int>(Theme::ContentItem::UseCustomColor)));
                act->setCheckable(true);
                act->setChecked(mSelectedThemeContentItem->useCustomColor());
                grp->addAction(act);

                connect(childmenu, &QMenu::triggered, this, &ThemePreviewWidget::slotForegroundColorMenuTriggered);

                menu.addMenu(childmenu)->setText(i18n("Foreground Color"));
            }

            if (mSelectedThemeContentItem->canBeDisabled()) {
                auto childmenu = new QMenu(&menu);

                auto grp = new QActionGroup(childmenu);

                QAction *act =
                    childmenu->addAction(i18nc("Hide a mark if the mail does not have the attribute, e.g. Important mark on a non important mail", "Hide"));
                act->setData(QVariant(static_cast<int>(Theme::ContentItem::HideWhenDisabled)));
                act->setCheckable(true);
                act->setChecked(mSelectedThemeContentItem->hideWhenDisabled());
                grp->addAction(act);
                act = childmenu->addAction(
                    i18nc("Keep a empty space in the list if the mail does not have the attribute, e.g. Important mark on a non important mail",
                          "Keep Empty Space"));
                act->setData(QVariant(static_cast<int>(0)));
                act->setCheckable(true);
                act->setChecked(!(mSelectedThemeContentItem->softenByBlendingWhenDisabled() || mSelectedThemeContentItem->hideWhenDisabled()));
                grp->addAction(act);
                act = childmenu->addAction(
                    i18nc("Show the icon softened in the list if the mail does not have the attribute, e.g. Important mark on a non important mail",
                          "Keep Softened Icon"));
                act->setData(QVariant(static_cast<int>(Theme::ContentItem::SoftenByBlendingWhenDisabled)));
                act->setCheckable(true);
                act->setChecked(mSelectedThemeContentItem->softenByBlendingWhenDisabled());
                grp->addAction(act);

                connect(childmenu, &QMenu::triggered, this, &ThemePreviewWidget::slotDisabledFlagsMenuTriggered);

                menu.addMenu(childmenu)->setText(i18n("When Disabled"));
            }
        }

        if (mDelegate->hitItem()) {
            if (mDelegate->hitItem()->type() == Item::GroupHeader) {
                menu.addSection(i18n("Group Header"));

                // Background color (mode) submenu
                auto childmenu = new QMenu(&menu);

                auto grp = new QActionGroup(childmenu);

                QAction *act = childmenu->addAction(i18nc("@action:inmenu Group header background color setting", "None"));
                act->setData(QVariant(static_cast<int>(Theme::Transparent)));
                act->setCheckable(true);
                act->setChecked(mTheme->groupHeaderBackgroundMode() == Theme::Transparent);
                grp->addAction(act);
                act = childmenu->addAction(i18nc("@action:inmenu Group header background color setting", "Automatic"));
                act->setData(QVariant(static_cast<int>(Theme::AutoColor)));
                act->setCheckable(true);
                act->setChecked(mTheme->groupHeaderBackgroundMode() == Theme::AutoColor);
                grp->addAction(act);
                act = childmenu->addAction(i18nc("@action:inmenu Group header background color setting", "Custom..."));
                act->setData(QVariant(static_cast<int>(Theme::CustomColor)));
                act->setCheckable(true);
                act->setChecked(mTheme->groupHeaderBackgroundMode() == Theme::CustomColor);
                grp->addAction(act);

                connect(childmenu, &QMenu::triggered, this, &ThemePreviewWidget::slotGroupHeaderBackgroundModeMenuTriggered);

                menu.addMenu(childmenu)->setText(i18n("Background Color"));

                // Background style submenu
                childmenu = new QMenu(&menu);

                grp = new QActionGroup(childmenu);
                QVector<QPair<QString, int>> styles = Theme::enumerateGroupHeaderBackgroundStyles();
                QVector<QPair<QString, int>>::ConstIterator end(styles.constEnd());

                for (QVector<QPair<QString, int>>::ConstIterator it = styles.constBegin(); it != end; ++it) {
                    act = childmenu->addAction((*it).first);
                    act->setData(QVariant((*it).second));
                    act->setCheckable(true);
                    act->setChecked(mTheme->groupHeaderBackgroundStyle() == static_cast<Theme::GroupHeaderBackgroundStyle>((*it).second));
                    grp->addAction(act);
                }

                connect(childmenu, &QMenu::triggered, this, &ThemePreviewWidget::slotGroupHeaderBackgroundStyleMenuTriggered);

                act = menu.addMenu(childmenu);
                act->setText(i18n("Background Style"));
                if (mTheme->groupHeaderBackgroundMode() == Theme::Transparent) {
                    act->setEnabled(false);
                }
            }
        }

        if (menu.isEmpty()) {
            return;
        }

        menu.exec(viewport()->mapToGlobal(e->pos()));
    }
}

void ThemePreviewWidget::slotDisabledFlagsMenuTriggered(QAction *act)
{
    if (!mSelectedThemeContentItem) {
        return;
    }

    bool ok;
    const int flags = act->data().toInt(&ok);
    if (!ok) {
        return;
    }

    mSelectedThemeContentItem->setHideWhenDisabled(flags == Theme::ContentItem::HideWhenDisabled);
    mSelectedThemeContentItem->setSoftenByBlendingWhenDisabled(flags == Theme::ContentItem::SoftenByBlendingWhenDisabled);

    setTheme(mTheme); // this will reset theme cache and trigger a global update
}

void ThemePreviewWidget::slotForegroundColorMenuTriggered(QAction *act)
{
    if (!mSelectedThemeContentItem) {
        return;
    }

    bool ok;
    const int flag = act->data().toInt(&ok);
    if (!ok) {
        return;
    }

    if (flag == 0) {
        mSelectedThemeContentItem->setUseCustomColor(false);
        setTheme(mTheme); // this will reset theme cache and trigger a global update
        return;
    }

    QColor clr;
    clr = QColorDialog::getColor(mSelectedThemeContentItem->customColor(), this);
    if (!clr.isValid()) {
        return;
    }

    mSelectedThemeContentItem->setCustomColor(clr);
    mSelectedThemeContentItem->setUseCustomColor(true);

    setTheme(mTheme); // this will reset theme cache and trigger a global update
}

void ThemePreviewWidget::slotSoftenActionTriggered(bool)
{
    if (!mSelectedThemeContentItem) {
        return;
    }

    mSelectedThemeContentItem->setSoftenByBlending(!mSelectedThemeContentItem->softenByBlending());
    setTheme(mTheme); // this will reset theme cache and trigger a global update
}

void ThemePreviewWidget::slotFontMenuTriggered(QAction *act)
{
    if (!mSelectedThemeContentItem) {
        return;
    }

    bool ok;
    const int flag = act->data().toInt(&ok);
    if (!ok) {
        return;
    }

    if (flag == Theme::ContentItem::IsBold && mSelectedThemeContentItem->isBold() != act->isChecked()) {
        mSelectedThemeContentItem->setBold(act->isChecked());
        setTheme(mTheme);
    } else if (flag == Theme::ContentItem::IsItalic && mSelectedThemeContentItem->isItalic() != act->isChecked()) {
        mSelectedThemeContentItem->setItalic(act->isChecked());
        setTheme(mTheme);
    }
}

void ThemePreviewWidget::slotGroupHeaderBackgroundModeMenuTriggered(QAction *act)
{
    bool ok;
    Theme::GroupHeaderBackgroundMode mode = static_cast<Theme::GroupHeaderBackgroundMode>(act->data().toInt(&ok));
    if (!ok) {
        return;
    }

    switch (mode) {
    case Theme::Transparent:
        mTheme->setGroupHeaderBackgroundMode(Theme::Transparent);
        break;
    case Theme::AutoColor:
        mTheme->setGroupHeaderBackgroundMode(Theme::AutoColor);
        break;
    case Theme::CustomColor: {
        QColor clr;
        clr = QColorDialog::getColor(mTheme->groupHeaderBackgroundColor(), this);
        if (!clr.isValid()) {
            return;
        }

        mTheme->setGroupHeaderBackgroundMode(Theme::CustomColor);
        mTheme->setGroupHeaderBackgroundColor(clr);
        break;
    }
    }

    setTheme(mTheme); // this will reset theme cache and trigger a global update
}

void ThemePreviewWidget::slotGroupHeaderBackgroundStyleMenuTriggered(QAction *act)
{
    bool ok;
    Theme::GroupHeaderBackgroundStyle mode = static_cast<Theme::GroupHeaderBackgroundStyle>(act->data().toInt(&ok));
    if (!ok) {
        return;
    }

    mTheme->setGroupHeaderBackgroundStyle(mode);

    setTheme(mTheme); // this will reset theme cache and trigger a global update
}

void ThemePreviewWidget::paintEvent(QPaintEvent *e)
{
    QTreeWidget::paintEvent(e);

    if (mThemeSelectedContentItemRect.isValid() || (mDropIndicatorPoint1 != mDropIndicatorPoint2)) {
        QPainter painter(viewport());

        if (mThemeSelectedContentItemRect.isValid()) {
            painter.setPen(QPen(Qt::black));
            painter.drawRect(mThemeSelectedContentItemRect);
        }
        if (mDropIndicatorPoint1 != mDropIndicatorPoint2) {
            painter.setPen(QPen(Qt::black, 3));
            painter.drawLine(mDropIndicatorPoint1, mDropIndicatorPoint2);
        }
    }
}

void ThemePreviewWidget::slotHeaderContextMenuRequested(const QPoint &pos)
{
    if (mReadOnly) {
        return;
    }

    QTreeWidgetItem *hitem = headerItem();
    if (!hitem) {
        return; // ooops
    }

    int col = header()->logicalIndexAt(pos);

    if (col < 0) {
        return;
    }

    if (col >= mTheme->columns().count()) {
        return;
    }

    mSelectedThemeColumn = mTheme->column(col);
    if (!mSelectedThemeColumn) {
        return;
    }

    QMenu menu;

    menu.setTitle(mSelectedThemeColumn->label());

    QAction *act = menu.addAction(i18n("Column Properties..."));
    connect(act, &QAction::triggered, this, &ThemePreviewWidget::slotColumnProperties);

    act = menu.addAction(i18n("Add Column..."));
    connect(act, &QAction::triggered, this, &ThemePreviewWidget::slotAddColumn);

    act = menu.addAction(i18n("Delete Column"));
    connect(act, &QAction::triggered, this, &ThemePreviewWidget::slotDeleteColumn);
    act->setEnabled(col > 0);

    menu.addSeparator();

    act = menu.addAction(i18n("Move Column to Left"));
    connect(act, &QAction::triggered, this, &ThemePreviewWidget::slotMoveColumnToLeft);
    act->setEnabled(col > 0);

    act = menu.addAction(i18n("Move Column to Right"));
    connect(act, &QAction::triggered, this, &ThemePreviewWidget::slotMoveColumnToRight);
    act->setEnabled(col < mTheme->columns().count() - 1);

    menu.exec(header()->mapToGlobal(pos));
}

void ThemePreviewWidget::slotMoveColumnToLeft()
{
    if (!mSelectedThemeColumn) {
        return;
    }

    const int columnIndex = mTheme->columns().indexOf(mSelectedThemeColumn);
    mTheme->moveColumn(columnIndex, columnIndex - 1);
    setTheme(mTheme); // this will reset theme cache and trigger a global update
}

void ThemePreviewWidget::slotMoveColumnToRight()
{
    if (!mSelectedThemeColumn) {
        return;
    }

    const int columnIndex = mTheme->columns().indexOf(mSelectedThemeColumn);
    mTheme->moveColumn(columnIndex, columnIndex + 1);
    setTheme(mTheme); // this will reset theme cache and trigger a global update
}

void ThemePreviewWidget::slotAddColumn()
{
    int newColumnIndex = mTheme->columns().count();

    if (mSelectedThemeColumn) {
        newColumnIndex = mTheme->columns().indexOf(mSelectedThemeColumn);
        if (newColumnIndex < 0) {
            newColumnIndex = mTheme->columns().count();
        } else {
            newColumnIndex++;
        }
    }

    mSelectedThemeColumn = new Theme::Column();
    mSelectedThemeColumn->setLabel(i18n("New Column"));
    mSelectedThemeColumn->setVisibleByDefault(true);

    mSelectedThemeColumn->addMessageRow(new Theme::Row());
    mSelectedThemeColumn->addGroupHeaderRow(new Theme::Row());

    auto dlg = new ThemeColumnPropertiesDialog(this, mSelectedThemeColumn, i18n("Add New Column"));

    if (dlg->exec() == QDialog::Accepted) {
        mTheme->insertColumn(newColumnIndex, mSelectedThemeColumn);

        mSelectedThemeContentItem = nullptr;
        mThemeSelectedContentItemRect = QRect();
        mDropIndicatorPoint1 = mDropIndicatorPoint2;

        setTheme(mTheme); // this will reset theme cache and trigger a global update
    } else {
        delete mSelectedThemeColumn;
        mSelectedThemeColumn = nullptr;
    }

    delete dlg;
}

void ThemePreviewWidget::slotColumnProperties()
{
    if (!mSelectedThemeColumn) {
        return;
    }

    auto dlg = new ThemeColumnPropertiesDialog(this, mSelectedThemeColumn, i18n("Column Properties"));

    if (dlg->exec() == QDialog::Accepted) {
        mSelectedThemeContentItem = nullptr;
        mThemeSelectedContentItemRect = QRect();
        mDropIndicatorPoint1 = mDropIndicatorPoint2;

        setTheme(mTheme); // this will reset theme cache and trigger a global update
    }

    delete dlg;
}

void ThemePreviewWidget::slotDeleteColumn()
{
    if (!mSelectedThemeColumn) {
        return;
    }

    const int idx = mTheme->columns().indexOf(mSelectedThemeColumn);
    if (idx < 1) { // first column can't be deleted
        return;
    }

    mTheme->removeColumn(mSelectedThemeColumn);
    delete mSelectedThemeColumn;
    mSelectedThemeColumn = nullptr;

    mSelectedThemeContentItem = nullptr;
    mThemeSelectedContentItemRect = QRect();
    mDropIndicatorPoint1 = mDropIndicatorPoint2;

    setTheme(mTheme); // this will reset theme cache and trigger a global update
}

ThemeEditor::ThemeEditor(QWidget *parent)
    : OptionSetEditor(parent)
{
    mCurrentTheme = nullptr;

    // Appearance tab
    auto tab = new QWidget(this);
    addTab(tab, i18n("Appearance"));

    auto tabg = new QGridLayout(tab);

    auto gb = new QGroupBox(i18n("Content Items"), tab);
    tabg->addWidget(gb, 0, 0);

    auto gblayout = new QGridLayout(gb);

    Theme dummyTheme;

    auto cil = new ThemeContentItemSourceLabel(gb, Theme::ContentItem::Subject);
    cil->setText(Theme::ContentItem::description(cil->type()));
    cil->setToolTip(Theme::ContentItem::description(cil->type()));
    gblayout->addWidget(cil, 0, 0);

    cil = new ThemeContentItemSourceLabel(gb, Theme::ContentItem::Date);
    cil->setText(Theme::ContentItem::description(cil->type()));
    cil->setToolTip(Theme::ContentItem::description(cil->type()));
    gblayout->addWidget(cil, 1, 0);

    cil = new ThemeContentItemSourceLabel(gb, Theme::ContentItem::Size);
    cil->setText(Theme::ContentItem::description(cil->type()));
    cil->setToolTip(Theme::ContentItem::description(cil->type()));
    gblayout->addWidget(cil, 2, 0);

    cil = new ThemeContentItemSourceLabel(gb, Theme::ContentItem::Sender);
    cil->setText(Theme::ContentItem::description(cil->type()));
    cil->setToolTip(Theme::ContentItem::description(cil->type()));
    gblayout->addWidget(cil, 0, 1);

    cil = new ThemeContentItemSourceLabel(gb, Theme::ContentItem::Receiver);
    cil->setText(Theme::ContentItem::description(cil->type()));
    cil->setToolTip(Theme::ContentItem::description(cil->type()));
    gblayout->addWidget(cil, 1, 1);

    cil = new ThemeContentItemSourceLabel(gb, Theme::ContentItem::SenderOrReceiver);
    cil->setText(Theme::ContentItem::description(cil->type()));
    cil->setToolTip(Theme::ContentItem::description(cil->type()));
    gblayout->addWidget(cil, 2, 1);

    cil = new ThemeContentItemSourceLabel(gb, Theme::ContentItem::MostRecentDate);
    cil->setText(Theme::ContentItem::description(cil->type()));
    cil->setToolTip(Theme::ContentItem::description(cil->type()));
    gblayout->addWidget(cil, 0, 2);

    cil = new ThemeContentItemSourceLabel(gb, Theme::ContentItem::TagList);
    cil->setText(Theme::ContentItem::description(cil->type()));
    cil->setToolTip(Theme::ContentItem::description(cil->type()));
    gblayout->addWidget(cil, 1, 2);

    cil = new ThemeContentItemSourceLabel(gb, Theme::ContentItem::Folder);
    cil->setText(Theme::ContentItem::description(cil->type()));
    cil->setToolTip(Theme::ContentItem::description(cil->type()));
    gblayout->addWidget(cil, 2, 2);

    cil = new ThemeContentItemSourceLabel(gb, Theme::ContentItem::CombinedReadRepliedStateIcon);
    cil->setPixmap(*dummyTheme.pixmap(Theme::IconRepliedAndForwarded));
    cil->setToolTip(Theme::ContentItem::description(cil->type()));
    gblayout->addWidget(cil, 0, 3);

    cil = new ThemeContentItemSourceLabel(gb, Theme::ContentItem::ReadStateIcon);
    cil->setPixmap(*dummyTheme.pixmap(Theme::IconNew));
    cil->setToolTip(Theme::ContentItem::description(cil->type()));
    gblayout->addWidget(cil, 1, 3);

    cil = new ThemeContentItemSourceLabel(gb, Theme::ContentItem::RepliedStateIcon);
    cil->setPixmap(*dummyTheme.pixmap(Theme::IconReplied));
    cil->setToolTip(Theme::ContentItem::description(cil->type()));
    gblayout->addWidget(cil, 2, 3);

    cil = new ThemeContentItemSourceLabel(gb, Theme::ContentItem::AttachmentStateIcon);
    cil->setPixmap(*dummyTheme.pixmap(Theme::IconAttachment));
    cil->setToolTip(Theme::ContentItem::description(cil->type()));
    gblayout->addWidget(cil, 0, 4);

    cil = new ThemeContentItemSourceLabel(gb, Theme::ContentItem::EncryptionStateIcon);
    cil->setPixmap(*dummyTheme.pixmap(Theme::IconFullyEncrypted));
    cil->setToolTip(Theme::ContentItem::description(cil->type()));
    gblayout->addWidget(cil, 1, 4);

    cil = new ThemeContentItemSourceLabel(gb, Theme::ContentItem::SignatureStateIcon);
    cil->setPixmap(*dummyTheme.pixmap(Theme::IconFullySigned));
    cil->setToolTip(Theme::ContentItem::description(cil->type()));
    gblayout->addWidget(cil, 2, 4);

    cil = new ThemeContentItemSourceLabel(gb, Theme::ContentItem::ActionItemStateIcon);
    cil->setPixmap(*dummyTheme.pixmap(Theme::IconActionItem));
    cil->setToolTip(Theme::ContentItem::description(cil->type()));
    gblayout->addWidget(cil, 0, 5);

    cil = new ThemeContentItemSourceLabel(gb, Theme::ContentItem::AnnotationIcon);
    cil->setPixmap(*dummyTheme.pixmap(Theme::IconAnnotation));
    cil->setToolTip(Theme::ContentItem::description(cil->type()));
    gblayout->addWidget(cil, 1, 5);

    cil = new ThemeContentItemSourceLabel(gb, Theme::ContentItem::InvitationIcon);
    cil->setPixmap(*dummyTheme.pixmap(Theme::IconInvitation));
    cil->setToolTip(Theme::ContentItem::description(cil->type()));
    gblayout->addWidget(cil, 2, 5);

    cil = new ThemeContentItemSourceLabel(gb, Theme::ContentItem::ImportantStateIcon);
    cil->setPixmap(*dummyTheme.pixmap(Theme::IconImportant));
    cil->setToolTip(Theme::ContentItem::description(cil->type()));
    gblayout->addWidget(cil, 0, 6);

    cil = new ThemeContentItemSourceLabel(gb, Theme::ContentItem::SpamHamStateIcon);
    cil->setPixmap(*dummyTheme.pixmap(Theme::IconSpam));
    cil->setToolTip(Theme::ContentItem::description(cil->type()));
    gblayout->addWidget(cil, 1, 6);

    cil = new ThemeContentItemSourceLabel(gb, Theme::ContentItem::WatchedIgnoredStateIcon);
    cil->setPixmap(*dummyTheme.pixmap(Theme::IconWatched));
    cil->setToolTip(Theme::ContentItem::description(cil->type()));
    gblayout->addWidget(cil, 2, 6);

    cil = new ThemeContentItemSourceLabel(gb, Theme::ContentItem::ExpandedStateIcon);
    cil->setPixmap(*dummyTheme.pixmap(Theme::IconShowMore));
    cil->setToolTip(Theme::ContentItem::description(cil->type()));
    gblayout->addWidget(cil, 0, 7);

    cil = new ThemeContentItemSourceLabel(gb, Theme::ContentItem::VerticalLine);
    cil->setPixmap(*dummyTheme.pixmap(Theme::IconVerticalLine));
    cil->setToolTip(Theme::ContentItem::description(cil->type()));
    gblayout->addWidget(cil, 1, 7);

    cil = new ThemeContentItemSourceLabel(gb, Theme::ContentItem::HorizontalSpacer);
    cil->setPixmap(*dummyTheme.pixmap(Theme::IconHorizontalSpacer));
    cil->setToolTip(Theme::ContentItem::description(cil->type()));
    gblayout->addWidget(cil, 2, 7);

    mPreviewWidget = new ThemePreviewWidget(tab);
    tabg->addWidget(mPreviewWidget, 1, 0);

    auto l = new QLabel(tab);
    l->setText(
        i18n("Right click on the header to add or modify columns. Drag the content items and drop them on the columns in order to compose your theme. Right "
             "click on the items inside the view for more options."));
    l->setWordWrap(true);
    l->setAlignment(Qt::AlignCenter);
    tabg->addWidget(l, 2, 0);

    tabg->setRowStretch(1, 1);

    // Advanced tab
    tab = new QWidget(this);
    addTab(tab, i18nc("@title:tab Advanced theme settings", "Advanced"));

    tabg = new QGridLayout(tab);

    l = new QLabel(i18n("Header:"), tab);
    tabg->addWidget(l, 0, 0);

    mViewHeaderPolicyCombo = new QComboBox(tab);
    tabg->addWidget(mViewHeaderPolicyCombo, 0, 1);

    l = new QLabel(i18n("Icon size:"), tab);
    tabg->addWidget(l, 1, 0);

    mIconSizeSpinBox = new KPluralHandlingSpinBox(tab);
    mIconSizeSpinBox->setMinimum(8);
    mIconSizeSpinBox->setMaximum(64);
    mIconSizeSpinBox->setSuffix(ki18ncp("suffix in a spinbox", " pixel", " pixels"));

    QObject::connect(mIconSizeSpinBox, qOverload<int>(&KPluralHandlingSpinBox::valueChanged), this, &ThemeEditor::slotIconSizeSpinBoxValueChanged);

    tabg->addWidget(mIconSizeSpinBox, 1, 1);

    tabg->setColumnStretch(1, 1);
    tabg->setRowStretch(2, 1);
    fillViewHeaderPolicyCombo();
}

ThemeEditor::~ThemeEditor() = default;

void ThemeEditor::editTheme(Theme *set)
{
    mCurrentTheme = set;
    mPreviewWidget->setTheme(mCurrentTheme);

    if (!mCurrentTheme) {
        setEnabled(false);
        return;
    }
    setEnabled(true);

    nameEdit()->setText(set->name());
    descriptionEdit()->setPlainText(set->description());

    ComboBoxUtils::setIntegerOptionComboValue(mViewHeaderPolicyCombo, (int)mCurrentTheme->viewHeaderPolicy());

    mIconSizeSpinBox->setValue(set->iconSize());
    setReadOnly(mCurrentTheme->readOnly());
}

void ThemeEditor::setReadOnly(bool readOnly)
{
    mPreviewWidget->setReadOnly(readOnly);
    mViewHeaderPolicyCombo->setEnabled(!readOnly);
    mIconSizeSpinBox->setEnabled(!readOnly);
    OptionSetEditor::setReadOnly(readOnly);
}

void ThemeEditor::commit()
{
    if (!mCurrentTheme || mCurrentTheme->readOnly()) {
        return;
    }

    mCurrentTheme->setName(nameEdit()->text());
    mCurrentTheme->setDescription(descriptionEdit()->toPlainText());

    mCurrentTheme->setViewHeaderPolicy((Theme::ViewHeaderPolicy)ComboBoxUtils::getIntegerOptionComboValue(mViewHeaderPolicyCombo, 0));
    mCurrentTheme->setIconSize(mIconSizeSpinBox->value());
    // other settings are already committed to this theme
}

void ThemeEditor::fillViewHeaderPolicyCombo()
{
    ComboBoxUtils::fillIntegerOptionCombo(mViewHeaderPolicyCombo, Theme::enumerateViewHeaderPolicyOptions());
}

void ThemeEditor::slotNameEditTextEdited(const QString &newName)
{
    if (!mCurrentTheme) {
        return;
    }
    mCurrentTheme->setName(newName);
    Q_EMIT themeNameChanged();
}

void ThemeEditor::slotIconSizeSpinBoxValueChanged(int val)
{
    if (!mCurrentTheme) {
        return;
    }
    mCurrentTheme->setIconSize(val);

    mPreviewWidget->setTheme(mCurrentTheme); // will trigger a cache reset and a view update
}

MessageList::Core::Theme *ThemeEditor::editedTheme() const
{
    return mCurrentTheme;
}
