/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2013 CERN
 * @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 __SHAPE_RECT_H
#define __SHAPE_RECT_H

#include <geometry/shape.h>
#include <geometry/shape_line_chain.h>
#include <geometry/shape_circle.h>
#include <geometry/seg.h>

class SHAPE_RECT : public SHAPE
{
public:
    /**
     * Constructor
     * Creates an empty (0-sized) rectangle
     */
    SHAPE_RECT() :
        SHAPE( SH_RECT ), m_w( 0 ), m_h( 0 )
    {}

    /**
     * Constructor
     * Creates a rectangle defined by top-left corner (aX0, aY0), width aW and height aH.
     */
    SHAPE_RECT( int aX0, int aY0, int aW, int aH ) :
        SHAPE( SH_RECT ), m_p0( aX0, aY0 ), m_w( aW ), m_h( aH )
    {}

    /**
     * Constructor
     * Creates a rectangle defined by top-left corner aP0, width aW and height aH.
     */
     SHAPE_RECT( const VECTOR2I& aP0, int aW, int aH ) :
        SHAPE( SH_RECT ), m_p0( aP0 ), m_w( aW ), m_h( aH )
    {}

    /// @copydoc SHAPE::BBox()
    const BOX2I BBox( int aClearance = 0 ) const
    {
        BOX2I bbox( VECTOR2I( m_p0.x - aClearance,  m_p0.y - aClearance ),
                    VECTOR2I( m_w + 2 * aClearance, m_h + 2 * aClearance ) );
        //printf("bb : %s\n",bbox.Format().c_str());
        return bbox;
    }

    /**
     * Function Diagonal()
     *
     * Returns length of the diagonal of the rectangle
     * @return diagonal length
     */
    int Diagonal() const
    {
        return VECTOR2I( m_w, m_h ).EuclideanNorm();
    }

    /// @copydoc SHAPE::Collide()
    bool Collide( const SEG& aSeg, int aClearance = 0 ) const
    {
        //VECTOR2I pmin = VECTOR2I( std::min( aSeg.a.x, aSeg.b.x ), std::min( aSeg.a.y, aSeg.b.y ) );
        //VECTOR2I pmax = VECTOR2I( std::max( aSeg.a.x, aSeg.b.x ), std::max( aSeg.a.y, aSeg.b.y ));
        //BOX2I r( pmin, VECTOR2I( pmax.x - pmin.x, pmax.y - pmin.y ) );

        //if( BBox( 0 ).SquaredDistance( r ) > aClearance * aClearance )
        //    return false;

        if( BBox( 0 ).Contains( aSeg.A ) || BBox( 0 ).Contains( aSeg.B ) )
            return true;

         VECTOR2I vts[] = { VECTOR2I( m_p0.x, m_p0.y ),
                            VECTOR2I( m_p0.x, m_p0.y + m_h ),
                            VECTOR2I( m_p0.x + m_w, m_p0.y + m_h ),
                            VECTOR2I( m_p0.x + m_w, m_p0.y ),
                            VECTOR2I( m_p0.x, m_p0.y ) };

        for( int i = 0; i < 4; i++ )
        {
            SEG s( vts[i], vts[i + 1], i );

            if( s.Distance( aSeg ) <= aClearance )
                return true;
        }

        return false;
    }

    /**
     * Function GetPosition()
     *
     * @return top-left corner of the rectangle
     */
    const VECTOR2I& GetPosition() const
    {
        return m_p0;
    }

    /**
     * Function GetSize()
     *
     * @return size of the rectangle
     */
    const VECTOR2I GetSize() const
    {
        return VECTOR2I( m_w, m_h );
    }

    /**
     * Function GetWidth()
     *
     * @return width of the rectangle
     */
     const int GetWidth() const
     {
         return m_w;
     }

    /**
     * Function GetHeight()
     *
     * @return height of the rectangle
     */
    const int GetHeight() const
    {
        return m_h;
    }

private:
    ///> Top-left corner
    VECTOR2I m_p0;

    ///> Width
    int m_w;

    ///> Height
    int m_h;
};

#endif // __SHAPE_RECT_H
