#include "checkqueuetableview.h"

CheckQueueTableView::CheckQueueTableView(QWidget *parent)
    : QTableView(parent), m_dropRow(0) {
    setSelectionMode(QAbstractItemView::SingleSelection);
    setSelectionBehavior(QAbstractItemView::SelectRows);
    setDragEnabled(true);
    setAcceptDrops(true);
    setDragDropMode(QAbstractItemView::DragDrop);
    setDefaultDropAction(Qt::MoveAction);
    setDragDropOverwriteMode(false);
    setDropIndicatorShown(true);
}

int CheckQueueTableView::selectedRow() const {
    QItemSelectionModel *selection = selectionModel();
    return selection->hasSelection() ? selection->selectedRows().front().row() : -1;
}

void CheckQueueTableView::reset() {
    QTableView::reset();

    QObject::connect(model(), &QAbstractTableModel::rowsInserted, this, [this](const QModelIndex &parent, int first, int last) {
        Q_UNUSED(parent)
        Q_UNUSED(last)
        m_dropRow = first;
    });
}

void CheckQueueTableView::dropEvent(QDropEvent *e) {
    if (e->source() != this || e->dropAction() != Qt::MoveAction)
        return;

    int dragRow = selectedRow();

    QTableView::dropEvent(e);  // m_dropRow is set by inserted row

    if (m_dropRow > dragRow)
        --m_dropRow;

      QMetaObject::invokeMethod(this,
                                std::bind(&CheckQueueTableView::selectRow, this, m_dropRow),
                                Qt::QueuedConnection);  // Postpones selection
}