#ifndef BBOX2_H
#define BBOX2_H

#include "Point2.h"
#include "Line2.h"

class BBox2 {

protected:

	static constexpr float MAX = +99999;
	static constexpr float MIN = -99999;

	/** minimum */
	Point2 p1;

	/** maximum */
	Point2 p2;

public:

	/** empty ctor */
	BBox2() : p1(MAX,MAX), p2(MIN,MIN) {;}

	/** ctor */
	BBox2(const Point2& p1, const Point2& p2) : p1(p1), p2(p2) {;}

	/** adjust the bounding-box by adding this point */
	void add(const Point2& p) {

		if (p.x > p2.x) {p2.x = p.x;}
		if (p.y > p2.y) {p2.y = p.y;}

		if (p.x < p1.x) {p1.x = p.x;}
		if (p.y < p1.y) {p1.y = p.y;}

	}

	/** get the bbox's minimum */
	const Point2& getMin() const {return p1;}

	/** get the bbox's maximum */
	const Point2& getMax() const {return p2;}

	/** get the bbox's center point */
	Point2 getCenter() const { return (p1+p2) / 2; }


	/** equal? */
	bool operator == (const BBox2& o) const {
		return	(p1.x == o.p1.x) &&
				(p1.y == o.p1.y) &&
				(p2.x == o.p2.x) &&
				(p2.y == o.p2.y);
	}

	/** does the BBox intersect with the given line? */
	bool intersects (const Line2& l) const {
		const Line2 l1(p1.x, p1.y, p2.x, p1.y);		// upper
		const Line2 l2(p1.x, p2.y, p2.x, p2.y);		// lower
		const Line2 l3(p1.x, p1.y, p1.x, p2.y);		// left
		const Line2 l4(p2.x, p1.y, p2.x, p2.y);		// right
		return	l.getSegmentIntersection(l1) ||
				l.getSegmentIntersection(l2) ||
				l.getSegmentIntersection(l3) ||
				l.getSegmentIntersection(l4);
	}

	std::vector<Line2> lines() const {
		return std::vector<Line2>(
			{
				Line2(p1.x, p1.y, p2.x, p1.y),
				Line2(p1.x, p2.y, p2.x, p2.y),
				Line2(p1.x, p1.y, p1.x, p2.y),
				Line2(p2.x, p1.y, p2.x, p2.y)
			}
		);
	}

	bool contains(const Point2& p) const {
		if (p.x < p1.x) {return false;}
		if (p.x > p2.x) {return false;}
		if (p.y < p1.y) {return false;}
		if (p.y > p2.y) {return false;}
		return true;
	}

	/** grow the bbox by the amount given for each dimension */
	void grow(const Point2& p) {
		p1 -= p;	// decrease minimum
		p2 += p;	// increase maximum
	}

	/** grow the bbox by the amount given for each dimension */
	void grow(const float val) {
		p1 -= Point2(val, val);	// decrease minimum
		p2 += Point2(val, val);	// increase maximum
	}

};

#endif // BBOX2_H