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/* ============================================================
 *
 * This file is a part of digiKam project
 * https://www.digikam.org
 *
 * Date        : 20013-08-22
 * Description : List View Model with support for mime data and drag-n-drop
 *
 * SPDX-FileCopyrightText: 2013 by Veaceslav Munteanu <veaceslav dot munteanu90 at gmail dot com>
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 *
 * ============================================================ */

#include "tagmngrlistmodel.h"

// Qt includes

#include <QStringList>
#include <QSize>
#include <QBrush>
#include <QMimeData>
#include <QIODevice>

// KDE includes

#include <klocalizedstring.h>

// Local includes

#include "digikam_debug.h"
#include "tagmngrlistitem.h"

namespace Digikam
{

class Q_DECL_HIDDEN TagMngrListModel::Private
{
public:

    Private() = default;

    ListItem*  rootItem         = nullptr;
    QList<int> dragNewSelection;
};

TagMngrListModel::TagMngrListModel(QObject* const parent)
    : QAbstractItemModel(parent),
      d                 (new Private)
{
    QList<QVariant> rootData;
    rootData << QLatin1String("Quick List");
    d->rootItem = new ListItem(rootData);
}

TagMngrListModel::~TagMngrListModel()
{
    delete d->rootItem;
    delete d;
}

ListItem* TagMngrListModel::addItem(QList<QVariant> values)
{
    Q_EMIT layoutAboutToBeChanged();

    ListItem* const item = new ListItem(values, d->rootItem);

    /**
     * containsItem will return a valid pointer if item with the same
     * values is already added to it's children list.
     */
    ListItem* const existingItem = d->rootItem->containsItem(item);

    if (!existingItem)
    {
        d->rootItem->appendChild(item);

        Q_EMIT layoutChanged();

        return item;
    }
    else
    {
        delete item;

        return existingItem;
    }
}

QList<ListItem*> TagMngrListModel::allItems() const
{
    return d->rootItem->allChildren();
}

QList<int> TagMngrListModel::getDragNewSelection() const
{
    return d->dragNewSelection;
}

void TagMngrListModel::deleteItem(ListItem* const item)
{
    if (!item)
    {
        return;
    }

    Q_EMIT layoutAboutToBeChanged();

    d->rootItem->deleteChild(item);

    Q_EMIT layoutChanged();

}

int TagMngrListModel::columnCount(const QModelIndex& parent) const
{
    Q_UNUSED(parent);

    return 1;
}

Qt::DropActions TagMngrListModel::supportedDropActions() const
{
    return (Qt::CopyAction | Qt::MoveAction);
}

QStringList TagMngrListModel::mimeTypes() const
{
    QStringList types;
    types << QLatin1String("application/vnd.text.list");

    return types;
}

bool TagMngrListModel::setData(const QModelIndex& index, const QVariant& value, int role)
{
    Q_UNUSED(role);
    ListItem* const parent = static_cast<ListItem*>(index.internalPointer());<--- Shadow variable

    if (!parent)
    {
        qCDebug(DIGIKAM_GENERAL_LOG) << "No node found";

        return false;
    }

    QList<QVariant> itemDa;
    itemDa << value;
    parent->appendChild(new ListItem(itemDa,parent));

    return true;
}

QMimeData* TagMngrListModel::mimeData(const QModelIndexList& indexes) const
{
    QMimeData* const mimeData = new QMimeData();
    QByteArray encodedData;

    QDataStream stream(&encodedData, QIODevice::WriteOnly);

    for (const QModelIndex& index : std::as_const(indexes))<--- Shadow variable
    {
        if (index.isValid())
        {
            stream << (qint32)index.row();
        }
    }

    mimeData->setData(QLatin1String("application/vnd.text.list"), encodedData);

    return mimeData;
}

bool TagMngrListModel::dropMimeData(const QMimeData* data, Qt::DropAction action,
                                    int row, int column, const QModelIndex& parent)
{
    Q_UNUSED(column);
    Q_UNUSED(parent);

    if (action == Qt::IgnoreAction)
    {
        return true;
    }

    if (!(data->hasFormat(QLatin1String("application/vnd.text.list"))))
    {
        return false;
    }

    QByteArray       encodedData = data->data(QLatin1String("application/vnd.text.list"));
    QDataStream      stream(&encodedData, QIODevice::ReadOnly);
    QList<ListItem*> newItems;
    QList<ListItem*> finalItems;
    QList<int>       toRemove;

    qint32 itemPoz;
    int    temp = 0;

    while (!stream.atEnd())
    {
        stream >> itemPoz;
        newItems << d->rootItem->child(itemPoz);

        if (itemPoz < row)
        {
            ++temp;
        }

        toRemove.append(itemPoz);
    }

    row -= temp;

    Q_EMIT layoutAboutToBeChanged();

    for (QList<int>::reverse_iterator itr = toRemove.rbegin() ; itr != toRemove.rend() ; ++itr)
    {
        d->rootItem->deleteChild(*itr);
    }

    Q_EMIT layoutChanged();

    for (int it = 0 ; it < d->rootItem->childCount() ; ++it)
    {
        finalItems.append(d->rootItem->child(it));

        if (it == row)
        {
            finalItems.append(newItems);

            /**
             * After drag-n-drop selection is messed up, store the interval were
             * new items are and TagsMngrListView will update selection
             */
            d->dragNewSelection.clear();
            d->dragNewSelection << row;
            d->dragNewSelection << row + newItems.size();
        }
    }

    d->rootItem->removeAll();
    d->rootItem->appendList(finalItems);

    Q_EMIT layoutChanged();

    return true;
}

QVariant TagMngrListModel::data(const QModelIndex& index, int role) const
{
    if (!index.isValid())
    {
        return QVariant();
    }

    if (role == Qt::SizeHintRole)
    {
        return QSize(30,30);
    }

    if (role == Qt::TextAlignmentRole)
    {
        return Qt::AlignCenter;
    }

    ListItem* const item = static_cast<ListItem*>(index.internalPointer());

    return item->data(role);
}

Qt::ItemFlags TagMngrListModel::flags(const QModelIndex& index) const
{
    if (!index.isValid())
    {
        return Qt::NoItemFlags;
    }

    return (
            Qt::ItemIsEnabled     |
            Qt::ItemIsSelectable  |
            Qt::ItemIsDragEnabled |
            Qt::ItemIsDropEnabled
           );
}

QVariant TagMngrListModel::headerData(int /*section*/, Qt::Orientation orientation, int role) const
{
    if ((orientation == Qt::Horizontal) && (role == Qt::DisplayRole))
    {
        return QVariant(i18nc("@info", "Quick Access List"));
    }

    return QVariant();
}

QModelIndex TagMngrListModel::index(int row, int column, const QModelIndex& parent) const
{
    if (!hasIndex(row, column, parent))
    {
        return QModelIndex();
    }

    ListItem* parentItem = nullptr;

    if (!parent.isValid())
    {
        parentItem = d->rootItem;
    }
    else
    {
        parentItem = static_cast<ListItem*>(parent.internalPointer());
    }

    ListItem* const childItem = parentItem->child(row);

    if (childItem)
    {
        return createIndex(row, column, childItem);
    }
    else
    {
        return QModelIndex();
    }
}

QModelIndex TagMngrListModel::parent(const QModelIndex& index) const
{
    if (!index.isValid())
    {
        return QModelIndex();
    }

    ListItem* const childItem  = static_cast<ListItem*>(index.internalPointer());
    ListItem* const parentItem = childItem->parent();

    if (parentItem == d->rootItem)
    {
        return QModelIndex();
    }

    return createIndex(parentItem->row(), 0, parentItem);
}

int TagMngrListModel::rowCount(const QModelIndex& parent) const
{
    ListItem* parentItem = nullptr;

    if (parent.column() > 0)
    {
        return 0;
    }

    if (!parent.isValid())
    {
        parentItem = d->rootItem;
    }
    else
    {
        parentItem = static_cast<ListItem*>(parent.internalPointer());
    }

    return parentItem->childCount();
}

} // namespace Digikam

#include "moc_tagmngrlistmodel.cpp"