#pragma once
#include <GL/glut.h>
#include "Vector3.h"

class Spotlight
{
public:
	Spotlight(GLenum light);
	~Spotlight();
	void update(GLfloat angle, Vector3 position, bool isEnabled);


private:
	GLenum m_light;
	GLfloat cutoffAngle[1];
	GLfloat lightCharacterisitcs[4];
};

Spotlight::Spotlight(GLenum light)
{
	m_light = light;

	cutoffAngle[0] = 45.0f;
	lightCharacterisitcs[0] = 1.0f;
	lightCharacterisitcs[1] = 1.0f;
	lightCharacterisitcs[2] = 1.0f;
	lightCharacterisitcs[3] = 1.0f;

	GLfloat lightAmb1[4] = { 0.0f, 0.0f, 0.0f, 1.0f };

	glLightfv(m_light, GL_AMBIENT, lightAmb1);
	glLightfv(m_light, GL_SPECULAR, lightCharacterisitcs);
}


Spotlight::~Spotlight()
{
}


void Spotlight::update(GLfloat angle, Vector3 position, bool isEnabled)
{
	if (!isEnabled)
	{
		glDisable(m_light);
		return;
	}

	cutoffAngle[0] = angle;
	GLfloat spotlight[4] = { 1.0f, 1.0f, 1.0f, 1.0f };
	GLfloat nosePos[4] = { position.X(), position.Y(), position.Z(), 1.0f };
	GLfloat spotDirection[3] = { -1, -1, 0 };

	glLightfv(m_light, GL_DIFFUSE, lightCharacterisitcs);
	glLightfv(m_light, GL_POSITION, nosePos);
	glLightfv(m_light, GL_SPOT_DIRECTION, spotDirection);
	glLightfv(m_light, GL_SPOT_CUTOFF, cutoffAngle);

	glEnable(m_light);
}

//Examples

//cutOffAngle ++ or -- depending on keyboard input

void renderScene()
{
	[...]
	//glPushMatrix + Transformations for helicopter
	helicopter->drawHelicopter(mainRotorAngle, rearRotorAngle);
	spotlight->update(cutoffAngle, helicopter->getNoseMiddle(), showSpotlight);
	//glPopMatrix
	[...]

}

int main(int argc, char** argv)
{
	[...]
	spotlight = new Spotlight(GL_LIGHT1);
	[...]
	glutIdleFunc(renderScene);
}