#ifndef QUBE_H
#define QUBE_H

#include <vector>
#include "../../../geo/Triangle3.h"
#include "../../../math/Matrix4.h"

class Cube {

private:

	std::vector<Triangle3> trias;

public:

	/** ctor */
	Cube() {
		unitCube(true);
	}

	/** ctor with position, size and rotation */
	Cube(Point3 pos, Point3 size, Point3 rot_deg, const bool topAndBottom = true) {
		unitCube(topAndBottom);
		const Matrix4 mRot = Matrix4::getRotationDeg(rot_deg.x, rot_deg.y, rot_deg.z);
		const Matrix4 mSize = Matrix4::getScale(size.x, size.y, size.z);
		const Matrix4 mPos = Matrix4::getTranslation(pos.x, pos.y, pos.z);
		const Matrix4 mat = mPos * mRot * mSize;
		transform(mat);
	}

	/** get the cube's triangles */
	const std::vector<Triangle3> getTriangles() const {
		return trias;
	}

	void transform(const Matrix4& mat) {

		for (Triangle3& tria : trias) {

			Vector4 v1(tria.p1.x, tria.p1.y, tria.p1.z, 1);
			Vector4 v2(tria.p2.x, tria.p2.y, tria.p2.z, 1);
			Vector4 v3(tria.p3.x, tria.p3.y, tria.p3.z, 1);

			v1 = mat*v1;
			v2 = mat*v2;
			v3 = mat*v3;

			tria.p1 = Point3(v1.x, v1.y, v1.z);
			tria.p2 = Point3(v2.x, v2.y, v2.z);
			tria.p3 = Point3(v3.x, v3.y, v3.z);

		}

	}

	/** get a transformed version */
	Cube transformed(const Matrix4& mat) const {
		Cube res = *this;
		res.transform(mat);
		return res;
	}

private:

	/** build unit-cube faces */
	void unitCube(const bool topAndBottom) {

		const float s = 1.0f;



		// left?
		addQuad(
			Point3(+s, -s, -s),
			Point3(+s, -s, +s),
			Point3(-s, -s, +s),
			Point3(-s, -s, -s)
		);

		// right?
		addQuad(
			Point3(-s, +s, -s),
			Point3(-s, +s, +s),
			Point3(+s, +s, +s),
			Point3(+s, +s, -s)
		);


		// small side
		if (1 == 1) {

			// front
			addQuad(
				Point3(-s, -s, -s),
				Point3(-s, -s, +s),
				Point3(-s, +s, +s),
				Point3(-s, +s, -s)
			);

			// read
			addQuad(
				Point3(+s, +s, -s),
				Point3(+s, +s, +s),
				Point3(+s, -s, +s),
				Point3(+s, -s, -s)
			);

		}



		if (topAndBottom) {

			// top
			addQuad(
				Point3(+s, +s, +s),
				Point3(-s, +s, +s),
				Point3(-s, -s, +s),
				Point3(+s, -s, +s)
			);

			// bottom
			addQuad(
				Point3(+s, -s, -s),
				Point3(-s, -s, -s),
				Point3(-s, +s, -s),
				Point3(+s, +s, -s)
			);

		}

	}

	void addQuad(Point3 p1, Point3 p2, Point3 p3, Point3 p4) {
		trias.push_back( Triangle3(p1,p2,p3) );
		trias.push_back( Triangle3(p1,p3,p4) );
	}

};

#endif // QUBE_H