/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2014 CERN
 * Copyright (C) 2021 KiCad Developers, see AUTHORS.txt for contributors.
 * @author Tomasz Wlostowski <tomasz.wlostowski@cern.ch>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, you may find one here:
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * or you may search the http://www.gnu.org website for the version 2 license,
 * or you may write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 */

#ifndef EE_GRID_HELPER_H
#define EE_GRID_HELPER_H

#include <math/vector2d.h>
#include <origin_viewitem.h>
#include <tool/grid_helper.h>
#include <ee_selection.h>

class SCH_ITEM;


enum EE_GRID_HELPER_LAYERS : int
{
    LAYER_ANY = SCH_LAYER_ID_END + 1,
    LAYER_CONNECTABLE,
    LAYER_GRAPHICS
};


class EE_GRID_HELPER : public GRID_HELPER
{
public:

    EE_GRID_HELPER( TOOL_MANAGER* aToolMgr );

    /**
     * Function GetSnapped
     * If the EE_GRID_HELPER has highlighted a snap point (target shown), this function
     * will return a pointer to the item to which it snapped.
     *
     * @return NULL if not snapped.  Pointer to snapped item otherwise
     */
    SCH_ITEM* GetSnapped() const;

    VECTOR2I BestDragOrigin( const VECTOR2I& aMousePos, int aLayer, const EE_SELECTION& aItems );

    VECTOR2I BestSnapAnchor( const VECTOR2I& aOrigin, int aLayer, SCH_ITEM* aDraggedItem );
    VECTOR2I BestSnapAnchor( const VECTOR2I& aOrigin, int aLayer, const EE_SELECTION& aSkip = {} );

private:
    std::set<SCH_ITEM*> queryVisible( const BOX2I& aArea, const EE_SELECTION& aSkipList ) const;

    ANCHOR* nearestAnchor( const VECTOR2I& aPos, int aFlags, int aMatchLayer );

    /**
     * Insert the local anchor points in to the grid helper for the specified
     * schematic item, given the reference point and the direction of use for the point.
     *
     * @param aItem The schematic item for which to compute the anchors
     * @param aRefPos The point for which to compute the anchors (if used by the symbol)
     * @param aFrom Is this for an anchor that is designating a source point (aFrom=true) or not
     */
    void computeAnchors( SCH_ITEM* aItem, const VECTOR2I& aRefPos, bool aFrom = false );
};

#endif
