#ifndef RECT2_H
#define RECT2_H

#if defined(_WIN32)
#  ifdef _GD_CPP_CORE_API_IMPL
#    define GD_CPP_CORE_API __declspec(dllexport)
#  else
#    define GD_CPP_CORE_API __declspec(dllimport)
#  endif
#else
#  define GD_CPP_CORE_API
#endif

#include "Vector2.hpp"

#include <cmath>

#include <cstdlib>

namespace godot {

class String;

typedef Vector2 Size2;
typedef Vector2 Point2;

class Transform2D;

struct GD_CPP_CORE_API Rect2 {

	Point2 pos;
	Size2 size;

	inline const Vector2& get_pos() const { return pos; }
	inline void set_pos(const Vector2& p_pos) { pos=p_pos; }
	inline const Vector2& get_size() const { return size; }
	inline void set_size(const Vector2& p_size) { size=p_size; }

	inline real_t get_area() const { return size.width*size.height; }

	inline bool intersects(const Rect2& p_rect) const {
		if ( pos.x >= (p_rect.pos.x + p_rect.size.width) )
			return false;
		if ( (pos.x+size.width) <= p_rect.pos.x  )
			return false;
		if ( pos.y >= (p_rect.pos.y + p_rect.size.height) )
			return false;
		if ( (pos.y+size.height) <= p_rect.pos.y  )
			return false;

		return true;
	}

	real_t distance_to(const Vector2& p_point) const;

	bool intersects_transformed(const Transform2D& p_xform, const Rect2& p_rect) const;

	bool intersects_segment(const Point2& p_from, const Point2& p_to, Point2* r_pos=NULL, Point2* r_normal=NULL) const;

	inline bool encloses(const Rect2& p_rect) const {

		return 	(p_rect.pos.x>=pos.x) && (p_rect.pos.y>=pos.y) &&
			((p_rect.pos.x+p_rect.size.x)<(pos.x+size.x)) &&
			((p_rect.pos.y+p_rect.size.y)<(pos.y+size.y));

	}

	inline bool has_no_area() const {

		return (size.x<=0 || size.y<=0);

	}
	Rect2 clip(const Rect2& p_rect) const;

	Rect2 merge(const Rect2& p_rect) const;

	inline bool has_point(const Point2& p_point) const {
		if (p_point.x < pos.x)
			return false;
		if (p_point.y < pos.y)
			return false;

		if (p_point.x >= (pos.x+size.x) )
			return false;
		if (p_point.y >= (pos.y+size.y) )
			return false;

		return true;
	}

	inline bool no_area() const { return (size.width<=0 || size.height<=0 ); }

	inline bool operator==(const Rect2& p_rect) const { return pos==p_rect.pos && size==p_rect.size; }
	inline bool operator!=(const Rect2& p_rect) const { return pos!=p_rect.pos || size!=p_rect.size; }

	inline Rect2 grow(real_t p_by) const {

		Rect2 g=*this;
		g.pos.x-=p_by;
		g.pos.y-=p_by;
		g.size.width+=p_by*2;
		g.size.height+=p_by*2;
		return g;
	}

	inline Rect2 expand(const Vector2& p_vector) const {

		Rect2 r = *this;
		r.expand_to(p_vector);
		return r;
	}

	inline void expand_to(const Vector2& p_vector) { //in place function for speed

		Vector2 begin=pos;
		Vector2 end=pos+size;

		if (p_vector.x<begin.x)
			begin.x=p_vector.x;
		if (p_vector.y<begin.y)
			begin.y=p_vector.y;

		if (p_vector.x>end.x)
			end.x=p_vector.x;
		if (p_vector.y>end.y)
			end.y=p_vector.y;

		pos=begin;
		size=end-begin;
	}


	operator String() const;

	inline Rect2() {}
	inline Rect2( real_t p_x, real_t p_y, real_t p_width, real_t p_height) { pos=Point2(p_x,p_y); size=Size2( p_width, p_height ); }
	inline Rect2( const Point2& p_pos, const Size2& p_size ) { pos=p_pos; size=p_size; }
};


}

#endif // RECT2_H
