#include "light.h"

Light::Light() {
	printf("light not initialized\n");
}

Light::Light(GLenum _num, Vec _pos, Material _mat) {
	init(_num, _pos, _mat);
}

void Light::init(GLenum _num, Vec _pos, Material _mat) {
	  num = _num;
	  pos = _pos.clone();
	  mat = _mat.clone();
	  rot = new Vec(0,0,0);
	  showtrace = true;
	  sphere = gluNewQuadric();  
  
	  show();  
}

void Light::trace(bool _s) {
	showtrace = _s;
}

void Light::show() {
	enabled = true;
	glEnable(num);
}

void Light::hide() {
	enabled = false;
	glDisable(num);
}

void Light::setPosition(Vec newpos) {
	delete pos;
	pos = newpos.clone();
}

void Light::translate(Vec d) {
	pos->add((Vec)d);
}

void Light::rotate(Vec a) {
	rot->add((Vec)a);
}

void Light::setColor(Color* c) {
  Color sp = *(mat->specular->clone());
  delete mat;
  mat = new Material(*(c->clone()), sp);
}

void Light::draw() {
	if ( enabled ) {
		//save camera position
		glPushMatrix();

		glTranslatef(pos->x(), pos->y(), pos->z());

		float p[] = {0.0f, 0.0f, 0.0f, 1.0f};
		glLightfv(num, GL_POSITION, p);

		if (showtrace) {
			//sphere
			float c[] = {1,1,1,1};
			glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, c);
			gluSphere(sphere, 1, 10, 10);
		}

		//glLightfv(num, GL_AMBIENT, mat->ambient->v());  
		glLightfv(num, GL_DIFFUSE, mat->ambient->v());
		glLightfv(num, GL_SPECULAR, mat->specular->v());
		//TODO
		//glLightf(num,GL_QUADRATIC_ATTENUATION,.001f);

		glTranslatef(pos->x(), pos->y(), pos->z());

		glPopMatrix();
	}
}

SpotLight::SpotLight(GLenum _num, Vec _pos, Material _mat, float _angle) {
	Light::init(_num, _pos, _mat);

	cutoff_angle = _angle;
	cone = gluNewQuadric();  

	show();
}

void SpotLight::draw() {
	if ( enabled ) {
		//save camera position
		glPushMatrix();

		glRotatef(rot->x(), 1.0f, 0.0f, 0.0f);
		glRotatef(rot->y(), 0.0f, 1.0f, 0.0f);
		glRotatef(rot->z(), 0.0f, 0.0f, 1.0f);

		glTranslatef(pos->x(), pos->y(), pos->z());
		glLightf(num, GL_SPOT_CUTOFF, cutoff_angle);	

		//last parameter: 1 for positional
		//                0 for directional
		float p[] = {0.0f, 0.0f, 0.0f, 1.0f};
		glLightfv(num, GL_POSITION, p);

		GLfloat dir[] = {0.0f, -1.0f, 0.0f};
		glLightfv(num, GL_SPOT_DIRECTION, dir);

		if (showtrace) {
			//line
			glBegin(GL_LINES);
				glVertex3fv(p);
				glVertex3fv(dir);
			glEnd();
			//cone
			glTranslatef(0,5.5,0);
			glRotatef(90, 1, 0, 0);
			gluCylinder (cone, 0, 1, 5, 10, 20);

		}
		glPopMatrix();
	}
}