/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2017 Kicad Developers, see AUTHORS.txt for contributors.
 *
 * 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 TOOLS_ZONE_CREATE_HELPER__H_
#define TOOLS_ZONE_CREATE_HELPER__H_

#include <preview_items/polygon_geom_manager.h>
#include <preview_items/polygon_item.h>

#include <tools/drawing_tool.h>

namespace KIGFX
{
class VIEW;
}

/**
 * This class is an adjuct helper to the DRAWING_TOOL interactive
 * tool, which handles incoming geometry changes from a
 * POLYGON_GEOM_MANAGER and translates that into a ZONE_CONTAINER
 * based on given parameters
 */
class ZONE_CREATE_HELPER : public POLYGON_GEOM_MANAGER::CLIENT
{
public:

    /**
     * Parameters used to fully describe a zone creation process
     */
    struct PARAMS
    {
        ///> Should create a keepout zone?
        bool m_keepout;

        ///> The zone mode to operate in
        DRAWING_TOOL::ZONE_MODE m_mode;

        ///> Zone settings source (for similar and cutout zones)
        ZONE_CONTAINER* m_sourceZone;
    };

    /**
     * @param aTool the DRAWING_TOOL to provide the zone tool to
     * @param aParams the parameters to use to guide the zone creation
     */
    ZONE_CREATE_HELPER( DRAWING_TOOL& aTool, const PARAMS& aParams );

    ~ZONE_CREATE_HELPER();

    /*
     * Interface for receiving POLYGON_GEOM_MANAGER update
     */

    void OnGeometryChange( const POLYGON_GEOM_MANAGER& aMgr ) override;

    bool OnFirstPoint( POLYGON_GEOM_MANAGER& aMgr ) override;

    void OnComplete( const POLYGON_GEOM_MANAGER& aMgr ) override;

    /**
     * Function createNewZone()
     *
     * Prompt the user for new zone settings, and create a new zone with
     * those settings
     *
     * @param aKeepout should the zone be a keepout
     * @return the new zone, can be null if the user aborted
     */
    std::unique_ptr<ZONE_CONTAINER> createNewZone( bool aKeepout );

    /**
     * Function createZoneFromExisting
     *
     * Create a new zone with the settings from an existing zone
     *
     * @param aSrcZone the zone to copy settings from
     * @return the new zone
     */
    std::unique_ptr<ZONE_CONTAINER> createZoneFromExisting( const ZONE_CONTAINER& aSrcZone );

    /**
     * Function performZoneCutout()
     *
     * Cut one zone out of another one (i.e. subtraction) and
     * update the zone.
     *
     * @param aZone the zone to removed area from
     * @param aCutout the area to remove
     */
    void performZoneCutout( ZONE_CONTAINER& aZone, ZONE_CONTAINER& aCutout );

    /**
     * Commit the current zone-in-progress to the BOARD. This might
     * be adding a new zone, or modifying an existing zone with a
     * cutout, depending on parameters.
     *
     * @param aZone - the drawn zone outline to commit
     */
    void commitZone( std::unique_ptr<ZONE_CONTAINER> aZone );

private:

    DRAWING_TOOL& m_tool;

    ///> Parameters of the zone to be drawn
    const PARAMS& m_params;

    ///> The preview item to display
    KIGFX::PREVIEW::POLYGON_ITEM m_previewItem;

    ///> view that show the preview item
    KIGFX::VIEW& m_parentView;

    ///> The zone-in-progress
    std::unique_ptr<ZONE_CONTAINER> m_zone;
};

#endif /* __DRAWING_TOOL_H */