#pragma once

#include "vector2f.h"
#include <vector>

namespace utils
{
	const float g_Pi{ 3.1415926535f };

	unsigned int GetIdx(int x, int y, int cols);

#pragma region OpenGLDrawFunctionality

	void SetColor( const Color4f& color );
	
	void DrawPoint( float x, float y, float pointSize = 1.0f );
	void DrawPoint( const Point2f& p, float pointSize = 1.0f );
	void DrawPoints( Point2f *pVertices, int nrVertices, float pointSize = 1.0f );

	void DrawLine( float x1, float y1, float x2, float y2, float lineWidth = 1.0f );
	void DrawLine( const Point2f& p1, const Point2f& p2, float lineWidth = 1.0f );

	void DrawRect(float left, float bottom, float width, float height, float lineWidth = 1.0f);
	void DrawRect(const Point2f& bottomLeft, float width, float height, float lineWidth = 1.0f);
	void DrawRect(const Rectf& rect, float lineWidth = 1.0f);
	void FillRect(float left, float bottom, float width, float height);
	void FillRect(const Point2f& bottomLeft, float width, float height);
	void FillRect(const Rectf& rect);

	void DrawEllipse(float centerX, float centerY, float radX, float radY, float lineWidth = 1.0f);
	void DrawEllipse(const Point2f& center, float radX, float radY, float lineWidth = 1.0f);
	void DrawEllipse(const Ellipsef& ellipse , float lineWidth = 1.0f );
	void FillEllipse( float centerX, float centerY, float radX, float radY );
	void FillEllipse(const Ellipsef& ellipse );
	void FillEllipse(const Point2f& center, float radX, float radY);

	void DrawArc( float centerX, float centerY, float radX, float radY, float fromAngle, float tillAngle, float lineWidth = 1.0f );
	void DrawArc( const Point2f& center, float radX, float radY, float fromAngle, float tillAngle, float lineWidth = 1.0f );
	void FillArc( float centerX, float centerY, float radX, float radY, float fromAngle, float tillAngle );
	void FillArc( const Point2f& center, float radX, float radY, float fromAngle, float tillAngle );

	void DrawPolygon( const std::vector<Point2f>& vertices, bool closed = true, float lineWidth = 1.0f );
	void DrawPolygon( const Point2f *pVertices, size_t nrVertices, bool closed = true, float lineWidth = 1.0f );
	void FillPolygon( const std::vector<Point2f>& vertices);
	void FillPolygon( const Point2f *pVertices, size_t nrVertices);
#pragma endregion OpenGLDrawFunctionality

#pragma region CollisionFunctionality
	struct HitInfo
	{
		float lambda;
		Point2f intersectPoint;
		Vector2f normal;
	};
	bool IsPointInRect(const Point2f& p, const Rectf& r);
	bool IsPointInCircle(const Point2f& p, const Circlef& c);
	bool IsPointInPolygon( const Point2f& p, const std::vector<Point2f>& vertices );
	bool IsPointInPolygon( const Point2f& p, const Point2f* vertices, size_t nrVertices );

	bool IsOverlapping( const Point2f& a, const Point2f& b, const Circlef& c );
	bool IsOverlapping( const Point2f& a, const Point2f& b, const Rectf& r );

	bool IsOverlapping(const Rectf & r1, const Rectf & r2);
	bool IsOverlapping( const Rectf& r, const Circlef& c );
	bool IsOverlapping( const Circlef& c1, const Circlef& c2 );
	bool IsOverlapping( const std::vector<Point2f>& vertices, const Circlef& c );
	bool IsOverlapping( const Point2f* vertices, size_t nrVertices, const Circlef& c );
	bool Raycast( const Point2f* vertices, const size_t nrVertices, const Point2f& rayP1, const Point2f& rayP2, HitInfo& hitInfo );
	bool Raycast( const std::vector<Point2f>& vertices, const Point2f& rayP1, const Point2f& rayP2, HitInfo& hitInfo );

	bool IntersectLineSegments(const Point2f& p1, const Point2f& p2, const Point2f& q1, const Point2f& q2, float& outLambda1, float& outLambda2, float epsilon = 1e-6);
	float DistPointLineSegment(const Point2f& p, const Point2f& a, const Point2f& b);
	bool IsPointOnLineSegment(const Point2f& p, const Point2f& a, const Point2f& b);
#pragma endregion CollisionFunctionality

}