/*
 * Copyright (c) Contributors to the Open 3D Engine Project.
 * For complete copyright and license terms please see the LICENSE at the root of this distribution.
 *
 * SPDX-License-Identifier: Apache-2.0 OR MIT
 *
 */
#pragma once

#include <QUndoCommand>

class CommandHierarchyItemReparent
    : public QUndoCommand
{
public:

    void undo() override;
    void redo() override;

    static void Push(UndoStack* stack,
        HierarchyWidget* hierarchy,
        const HierarchyItemRawPtrList& items,
        const QTreeWidgetItemRawPtrList& itemParents);

private:

    CommandHierarchyItemReparent(UndoStack* stack,
        HierarchyWidget* hierarchy,
        const HierarchyItemRawPtrList& items);

    struct ChildItem
    {
        AZ::EntityId m_id;
        AZ::EntityId m_parentId;
        int m_row;
    };

    using ChildItemList = AZStd::list < ChildItem >;

    void Reparent(ChildItemList& sourceChildren, ChildItemList& destChildren, bool& childrenSorted);

    UndoStack* m_stack;

    HierarchyWidget* m_hierarchy;

    ChildItemList m_sourceChildren;
    ChildItemList m_destinationChildren;

    bool m_sourceChildrenSorted;
    bool m_destinationChildrenSorted;

    EntityHelpers::EntityIdList m_listToValidate;

    // The first execution of redo() is done in REACTION to a Qt
    // event that has ALREADY completed some necessary work. We ONLY
    // want to execute all of redo() on SUBSEQUENT calls.
    bool m_isFirstExecution;
};