#ifndef MV2DELEMENTFLOOROUTLINEPOLYGON_H
#define MV2DELEMENTFLOOROUTLINEPOLYGON_H

#include "MV2DElement.h"
#include "HasMoveableNodes.h"
#include "MapViewElementHelper.h"

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

class MV2DElementFloorOutlinePolygon : public MV2DElement, public HasMoveableNodes {

private:

	Floorplan::FloorOutlinePolygon& fo;

public:

	/** ctor */
	MV2DElementFloorOutlinePolygon(Floorplan::FloorOutlinePolygon& fo) : fo(fo) {;}

	/** get the element's 3D bounding box */
	BBox2 getBoundingBox() const override {
		BBox2 bbox;
		for (const Point2 p : fo.poly.points) { bbox.add(p); }
		return bbox;
	}

	/** get the element's minimal distance (nearest whatsoever) to the given point */
	ClickDist getMinDistanceXY(const Point2 p) const override {
		ClickDist min = ClickDist::max();
		for (int i = 0; i < (int)fo.poly.points.size()-1; ++i) {
			const Point2 p1 = fo.poly.points[i];
			const Point2 p2 = fo.poly.points[i+1];
			const ClickDist dst = MapElementHelper::getLineDistanceXY(p1, p2, p);
			if (dst < min) {min = dst;}
		}
		return min;
	}

	virtual void onFocus() override {

	}

	virtual void onUnfocus() override {
		selectedUserIdx = -1;	// clear selection
	}

	void paint(Painter& p) override {

		QBrush brush;
		QPen pen;

		// fill-style (depends on the mode)
		switch (fo.method) {
		case Floorplan::OutlineMethod::ADD:
			brush.setStyle(Qt::BrushStyle::SolidPattern);
			brush.setColor( fo.outdoor ? QColor(0,255,0,32) : QColor(0,0,0,24) );	// outdoor = green
			break;
		case Floorplan::OutlineMethod::REMOVE:
			brush.setStyle(Qt::BrushStyle::DiagCrossPattern);
			brush.setColor(QColor(0,0,0));
			break;
		default:
			// should not happen
			brush.setStyle(Qt::BrushStyle::SolidPattern);
			brush.setColor(QColor(255,0,0));
		}

		if (hasFocus()) {
			brush.setStyle(Qt::BrushStyle::FDiagPattern);
		}

		// outline + filled area
		pen.setColor(Qt::black);
		pen.setWidth( hasFocus() ? 2 : 1 );
		p.setPenBrush(pen, brush);
		p.drawPolygon(fo.poly.points);

		// selected endpoints?
		if (hasFocus() && selectedUserIdx != -1) {
			p.setPenBrush(Qt::NoPen, CFG::SEL_COLOR);
			p.drawCircle(fo.poly.points[selectedUserIdx]);
		}

		// available endpoints
		if (hasFocus()) {
			p.setPenBrush(Qt::black, Qt::NoBrush);
			for (const Point2 pt : fo.poly.points) {
				p.drawCircle(pt);
			}
		}


	}

	/** get a list of all nodes that are selectable / moveable */
	virtual std::vector<MoveableNode> getMoveableNodes() const override {
		std::vector<MoveableNode> nodes;
		for (int i = 0; i < (int) fo.poly.points.size(); ++i) {
			nodes.push_back(MoveableNode(i, fo.poly.points[i]));
		}
		return nodes;
	}

	/** the given node was moved */
	virtual void onNodeMove(MapView2D* v, const int userIdx, const Point2 newPos) override {
		(void) v;
		fo.poly.points[userIdx].x = newPos.x;
		fo.poly.points[userIdx].y = newPos.y;
	}

//	virtual void mousePressed(MapView2D* v, const Point2 p) override {
//		(void) v;
//		(void) p;
//	}

//	virtual void mouseMove(MapView2D* v, const Point2 _p) override {
//		(void) v;
//		if (selPoint == -1) {return;}
//		const Point2 p = v->getScaler().snap(_p);
//		fo.poly.points[selPoint].x = p.x;
//		fo.poly.points[selPoint].y = p.y;
//	}

//	virtual void mouseReleased(MapView2D* v, const Point2 _p) override {

//		(void) v;

//		//		if (selPoint != -1) {
//		//			const Point3 p = Scaler::snap(_p, CFG::MOVE_SNAP_SIZE_M);
//		//			fo.poly.points[selPoint].x = p.x;
//		//			fo.poly.points[selPoint].y = p.y;
//		//		}

//		// select a new point on mouse-release (more robust than on mouse-press)
//		const float t = v->getScaler().sm(CFG::SEL_THRESHOLD_SIZE_PX);
//		auto comp = [&] (const Point2 a, const Point2 b) {return a.getDistance(_p) < b.getDistance(_p);};
//		auto it = std::min_element(fo.poly.points.begin(), fo.poly.points.end(), comp);
//		if		(it == fo.poly.points.end())		{selPoint = -1;}	// none found -> skip
//		else if	((*it).getDistance(_p) > t)			{selPoint = -1;}	// nearest distance is above threshold -> skip
//		else										{selPoint = it - fo.poly.points.begin();}

//	}

	virtual bool keyPressEvent(MapView2D* v, QKeyEvent *e) override {
		(void) v;


		if (e->key() == Qt::Key_Delete) {

			// delete the currently selected vertex?
			if (selectedUserIdx != -1) {
				fo.poly.points.erase(fo.poly.points.begin() + selectedUserIdx);
				selectedUserIdx = -1;
				return true;
			}

		} else if (e->key() == Qt::Key_Plus && selectedUserIdx != -1) {
			int idx1 = selectedUserIdx;
			int idx2 = (selectedUserIdx + 1) % fo.poly.points.size();
			int idxNew = idx2;
			Point2 pNew = (fo.poly.points[idx1] + fo.poly.points[idx2]) / 2.0f;
			fo.poly.points.insert(fo.poly.points.begin() + idxNew, pNew);
			selectedUserIdx = idxNew;
			return true;
		}

		// not consumed
		return false;

	}


};

#endif // MV2DELEMENTFLOOROUTLINEPOLYGON_H