// lab2.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <stdlib.h>
#include <GL/glut.h>
#include "Lego.h"


static const GLdouble zToModel = 15 * Lego::lengthUnit;

static GLfloat animTime = 5.0; // modified by glutTimerFunc, used by glutDisplayFunc
static const unsigned int fps = 60; // used by timer and to start timer off
GLfloat xAngle = 0;
GLfloat yAngle = 0;
GLfloat zAngle = 0;

void reshape(int w, int h)
{
	glViewport(0, 0, w, h); // use the whole window
	if (w > 0 && h > 0) // if not minimized...
	{
		glMatrixMode(GL_PROJECTION);
		glLoadIdentity();

		GLdouble fovy = 40; //degrees
		GLdouble aspect = w / static_cast<double>(h);
		GLdouble zNear = zToModel - 100, zFar = zToModel + 100;
		//assert (zNear > 0);
		gluPerspective(fovy, aspect, zNear, zFar);

		glMatrixMode(GL_MODELVIEW);
	}
}

static void display(void)
{
	static Lego myLego;
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	GLfloat heightWhite = (animTime<=5) ? (10 + -7.0/5.0 * animTime) : (3);

	glPushMatrix();
		glTranslatef(0, heightWhite*Lego::heightUnit, 0);
		glRotatef(xAngle, 1, 0, 0);
		glRotatef(yAngle, 0, 1, 0);
		glRotatef(zAngle, 0, 0, 1);
		myLego.brick("yellow");
	glPopMatrix();
	glutSwapBuffers();
}

void init()
{
	glClearColor(0.0, 0.0, 0.0, 0.0);

	glEnable(GL_DEPTH_TEST);
	glEnable(GL_NORMALIZE);
	glShadeModel(GL_SMOOTH);
	glEnable(GL_LIGHTING);
	glEnable(GL_LIGHT0);

	const GLfloat light_position[] = {0,0,0,1};

	glLightfv(GL_LIGHT0, GL_POSITION, light_position);

	const GLfloat lmodel_ambient[] = {0.1, 0.1, 0.1, 1.0}; // If we don't set it to something, 
	glLightModelfv(GL_LIGHT_MODEL_AMBIENT, lmodel_ambient); // it seems to default to a fairly bright value.

	// glFrontFace varies during drawing, so it is handled by the Lego class.
	glEnable(GL_CULL_FACE);
	glCullFace(GL_BACK);

	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
	gluLookAt(	6*Lego::lengthUnit,	3*Lego::heightUnit,	zToModel,	// from
				0,					3*Lego::heightUnit,	0,			// to
				0,					1,					0);			// up
}

void processNormalKeys(unsigned char key, int x, int y)
{
	if (key == 27) {
		exit(0);
	}
}

void mouse(int button, int state, int x, int y)
{
	if (button == GLUT_RIGHT_BUTTON)
	{
		xAngle = xAngle + xAngle*0.10;
	}
	else if (button == GLUT_LEFT_BUTTON)
	{

	}
	else if (button == GLUT_MIDDLE_BUTTON)
	{

	}

}

int main(int argc, char* argv[])
{
	glutInitWindowPosition(100,100);
	glutInitWindowSize(400,400);
	glutInit(&argc, argv);
	glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
	glutCreateWindow("Lab 2: phillijw");
	init();
	glutDisplayFunc(display);
	glutIdleFunc(display);
	glutReshapeFunc(reshape);
	glutMouseFunc(mouse);
	glutKeyboardFunc(processNormalKeys);
	glutMainLoop();
	return 0;
}