#ifndef MAPELEMENTHELPER_H
#define MAPELEMENTHELPER_H

#include <Indoor/geo/Point2.h>
#include <Indoor/geo/Point3.h>
#include <Indoor/geo/Line2.h>

#include <QColor>
#include <QPen>
#include <QBrush>

#include <Indoor/floorplan/v2/Floorplan.h>

#include "ClickDist.h"

/** configuration */
namespace CFG {
	const float	MOVE_SNAP_SIZE_M = 0.1f;		// in meter (= map-space)
	const int SEL_THRESHOLD_SIZE_PX = 15;		// in screen-pixels (-> should depend on the current zoom)
	const QColor FOCUS_COLOR = Qt::black;
	const QColor UNFOCUS_COLOR = Qt::gray;
	const QColor SEL_COLOR = Qt::blue;
}

/**
 * contains some common helper-methods
 */
class MapElementHelper {

public:

	/**
	 * get the minimal distance of dst to the line denoted by (p1, p2).
	 * this will generate line l perpendicular to (p1, p2)
	 * move l into dst
	 * and calculate the cut-point between l and (p1, p2)
	 */
	static ClickDist getLineDistanceXY(Point2 p1, Point2 p2, Point2 dst) {

		// the line (p1, p2)
		const Line2 line(p1, p2);

		// 90 degree rotation L of the line (p1, p2)
		const Point2 vec = (p1 - p2).perpendicular();

		// the line L
		const Line2 perb(dst-vec*100, dst+vec*100);

		// calculate the cut betwen L and (p1,p2) (if any)
		Point2 cut(0,0);
		ClickDist cutDist(99999999, ClickDistType::CUT);
		if (line.getSegmentIntersection(perb, cut)) {

			// distance between cut-point and mouse
			cutDist.dst_px = cut.getDistance(dst);

		}

		// distance from endpoints
		const ClickDist d1(p1.getDistance(dst), ClickDistType::DIRECT);
		const ClickDist d2(p2.getDistance(dst), ClickDistType::DIRECT);

		// return the nearest possibility:
		return std::min(d1, std::min(d2, cutDist));

	}

	static QPen getPen(Floorplan::Material mat, Floorplan::ObstacleType type, bool focus, float thickness_px) {

		using namespace Floorplan;
		QPen pen; pen.setColor(Qt::darkGray);
		pen.setWidth(thickness_px);

		// this one is very important!
		// as we change the line's width, the line also becomes longer
		// but, we do not want this! -> FlatCap
		pen.setCapStyle(Qt::FlatCap);

		if (focus) {pen.setColor(Qt::black);}
		if (mat == Material::CONCRETE) {;}
		if (mat == Material::GLASS) {pen.setStyle(Qt::PenStyle::DotLine);}
		if (type == ObstacleType::HANDRAIL) {pen.setStyle(Qt::PenStyle::DashLine);}
		if (type == ObstacleType::UNKNOWN) {pen.setColor(Qt::red);}
		if (type == ObstacleType::PILLAR) {pen.setColor(Qt::red);}

		return pen;
	}


};

#endif // MAPELEMENTHELPER_H