#include "dragrecordtable.hpp"

#include <QDrag>
#include <QDragEnterEvent>

#include "../../model/doc/document.hpp"

#include "../../model/world/tablemimedata.hpp"
#include "../../model/world/commands.hpp"

#include "dragdroputils.hpp"

void CSVWorld::DragRecordTable::startDragFromTable (const CSVWorld::DragRecordTable& table)
{
    std::vector<CSMWorld::UniversalId> records = table.getDraggedRecords();
    if (records.empty())
    {
        return;
    }

    CSMWorld::TableMimeData* mime = new CSMWorld::TableMimeData (records, mDocument);
    QDrag* drag = new QDrag (this);
    drag->setMimeData (mime);
    drag->setPixmap (QString::fromUtf8 (mime->getIcon().c_str()));
    drag->exec (Qt::CopyAction);
}

CSVWorld::DragRecordTable::DragRecordTable (CSMDoc::Document& document, QWidget* parent) :
QTableView(parent),
mDocument(document),
mEditLock(false)
{
    setAcceptDrops(true);
}

void CSVWorld::DragRecordTable::setEditLock (bool locked)
{
    mEditLock = locked;
}

void CSVWorld::DragRecordTable::dragEnterEvent(QDragEnterEvent *event)
{
    event->acceptProposedAction();
}

void CSVWorld::DragRecordTable::dragMoveEvent(QDragMoveEvent *event)
{
    QModelIndex index = indexAt(event->pos());
    if (CSVWorld::DragDropUtils::canAcceptData(*event, getIndexDisplayType(index)) ||
        CSVWorld::DragDropUtils::isInfo(*event, getIndexDisplayType(index)) )
    {
        if (index.flags() & Qt::ItemIsEditable)
        {
            event->accept();
            return;
        }
    }
    event->ignore();
}

void CSVWorld::DragRecordTable::dropEvent(QDropEvent *event)
{
    QModelIndex index = indexAt(event->pos());
    CSMWorld::ColumnBase::Display display = getIndexDisplayType(index);
    if (CSVWorld::DragDropUtils::canAcceptData(*event, display))
    {
        const CSMWorld::TableMimeData *tableMimeData = CSVWorld::DragDropUtils::getTableMimeData(*event);
        if (tableMimeData->fromDocument(mDocument))
        {
            CSMWorld::UniversalId id = CSVWorld::DragDropUtils::getAcceptedData(*event, display);
            QVariant newIndexData = QString::fromUtf8(id.getId().c_str());
            QVariant oldIndexData = index.data(Qt::EditRole);
            if (newIndexData != oldIndexData)
            {
                mDocument.getUndoStack().push(new CSMWorld::ModifyCommand(*model(), index, newIndexData));
            }
        }
    }
    else if (CSVWorld::DragDropUtils::isInfo(*event, display) && event->source() == this)
    {
        emit moveRecordsFromSameTable(event);
    }
}

CSMWorld::ColumnBase::Display CSVWorld::DragRecordTable::getIndexDisplayType(const QModelIndex &index) const
{
    Q_ASSERT(model() != nullptr);

    if (index.isValid())
    {
        QVariant display = model()->headerData(index.column(), Qt::Horizontal, CSMWorld::ColumnBase::Role_Display);
        if (display.isValid())
        {
            return static_cast<CSMWorld::ColumnBase::Display>(display.toInt());
        }
    }
    return CSMWorld::ColumnBase::Display_None;
}