#include <stdlib.h>
#include <stdio.h> // printf
#include "RgbImage.h"
#include <math.h>
#include <time.h>
#include <OpenGL/gl.h>
#include <OpenGL/glu.h>
#include <GLUT/glut.h> // openGL

//==================================================================== Definir cores
#define AZUL 0.0, 0.0, 1.0, 1.0
#define VERMELHO 1.0, 0.0, 0.0, 1.0
#define AMARELO 1.0, 1.0, 0.0, 1.0
#define VERDE 0.0, 1.0, 0.0, 1.0
#define LARANJA 0.8, 0.6, 0.1, 1.0
#define WHITE 1.0, 1.0, 1.0, 1.0
#define BLACK 0.0, 0.0, 0.0, 1.0
#define GRAY1 0.2, 0.2, 0.2, 1.0
#define GRAY2 0.8, 0.8, 0.8, 1.0
#define PRETO 0.0, 0.0, 0.0, 1.0

#include "RgbImage.h"
#define PI 3.14159

//================================================================================
//===========================================================Variaveis e constantes

//------------------------------------------------------------ Sistema Coordenadas
GLfloat xC = 16.0, zC = 15.0;
GLint wScreen = 800, hScreen = 500;
GLint msec = 100; //.. definicao do timer (actualizacao)

//------------------------------------------------------------ Observador
GLfloat rVisao = 3.0, aVisao = 0.5 * PI, incVisao = 0.1;
GLfloat angPersp = 109.0;
GLfloat obsPini[] = {1, 1.0, 0.5 * xC};
GLfloat obsPfin[] = {obsPini[0] - rVisao * cos(aVisao), obsPini[1], obsPini[2] - rVisao *sin(aVisao)};

RgbImage imag;

//--------------------------------------------- Escada
int y = 0, z = 0;
//------------------------------
int verticesESC = 3 * 52; // 53 vertices (x,y,z) = 53*3
int facesESC = 13;				// 53/4
int plataformas = 2;

static GLuint poligono[] = {};
static GLfloat vertices[] = {
		-2.000000, -0.000000, -0.960000, 2.000000, -0.000000, -0.960000, 2.000000, 0.000000, -0.000000, -2.000000, 0.000000, -0.000000, -2.000000, 0.000000, -0.960000, 2.000000, 0.000000, -0.960000, 2.000000, 0.160000, -0.960000, -2.000000, 0.160000, -0.960000, -2.000000, 0.160000, -1.280000, 2.000000, 0.160000, -1.280000, 2.000000, 0.160000, -0.960000, -2.000000, 0.160000, -0.960000, -2.000000, 0.160000, -1.280000, 2.000000, 0.160000, -1.280000, 2.000000, 0.320000, -1.280000, -2.000000, 0.320000, -1.280000, -2.000000, 0.320000, -1.600000, 2.000000, 0.320000, -1.600000, 2.000000, 0.320000, -1.280000, -2.000000, 0.320000, -1.280000, -2.000000, 0.320000, -1.600000, 2.000000, 0.320000, -1.600000, 2.000000, 0.480000, -1.600000, -2.000000, 0.480000, -1.600000, -2.000000, 0.480000, -2.560000, 2.000000, 0.480000, -2.560000, 2.000000, 0.480000, -1.600000, -2.000000, 0.480000, -1.600000, -2.000000, 0.480000, -2.560000, 2.000000, 0.480000, -2.560000, 2.000000, 0.640000, -2.560000, -2.000000, 0.640000, -2.560000, -2.000000, 0.640000, -2.880000, 2.000000, 0.640000, -2.880000, 2.000000, 0.640000, -2.560000, -2.000000, 0.640000, -2.560000, -2.000000, 0.640000, -2.880000, 2.000000, 0.640000, -2.880000, 2.000000, 0.800000, -2.880000, -2.000000, 0.800000, -2.880000, -2.000000, 0.800000, -3.200000, 2.000000, 0.800000, -3.200000, 2.000000, 0.800000, -2.880000, -2.000000, 0.800000, -2.880000, -2.000000, 0.800000, -3.200000, 2.000000, 0.800000, -3.200000, 2.000000, 0.960000, -3.200000, -2.000000, 0.960000, -3.200000, -2.000000, 0.960000, -4.160000, 2.000000, 0.960000, -4.160000, 2.000000, 0.960000, -3.200000, -2.000000, 0.960000, -3.200000};

static GLfloat normais[] = {
		0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 1.000000, 0.000000, 1.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 1.000000, 0.000000, 1.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 1.000000, 0.000000, 1.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 1.000000, 0.000000, 1.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 1.000000, 0.000000, 1.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 1.000000, 0.000000, 1.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 1.000000};

// -------------- objectos
void drawEscada()
{

	//------------------------- ESCADA
	glColor4f(GRAY2);
	glPushMatrix();
	glTranslatef(5, -4.0, 0.0);
	glScalef(20, 20, 19);

	for (int p = 0; p < facesESC; p++)
	{
		poligono[0] = p * 4 + 0;
		poligono[1] = p * 4 + 1;
		poligono[2] = p * 4 + 2;
		poligono[3] = p * 4 + 3;

		glDrawElements(GL_POLYGON, 4, GL_UNSIGNED_INT, poligono);
	}

	glPopMatrix();

}


void plataforma2(){
//------------------------- ESCADA
	glColor4f(GRAY1);
	glPushMatrix();
	glTranslatef(15, 18.0, -100.0);
	glScalef(20, 20, 19);

	for (int p = 0; p < facesESC; p++)
	{
		poligono[0] = p * 4 + 0;
		poligono[1] = p * 4 + 1;
		poligono[2] = p * 4 + 2;
		poligono[3] = p * 4 + 3;

		glDrawElements(GL_POLYGON, 4, GL_UNSIGNED_INT, poligono);
	}

	glPopMatrix();
}

void drawColuna(){
	glColor4f(0.5f, 0.35f, 0.05f, 1.0f);

	glPushMatrix();
	glBegin(GL_QUADS);
	glVertex3i(-5, 0, 2);
	glVertex3i(10, 0, 2);
	glVertex3i(10, 0, -5);
	glVertex3i(-5, 0, -5);
	glEnd();
	glPopMatrix();
}


void init(void)
{
	glClearColor(WHITE);
	glShadeModel(GL_SMOOTH);

	glEnable(GL_DEPTH_TEST);

	//-------------------------------
	glVertexPointer(3, GL_FLOAT, 0, vertices);

	glEnableClientState(GL_VERTEX_ARRAY);
	glNormalPointer(GL_FLOAT, 0, normais);
	glEnableClientState(GL_NORMAL_ARRAY);
}

GLvoid resize(GLsizei width, GLsizei height)
{
	wScreen = width;
	hScreen = height;
	glViewport(0, 0, wScreen, hScreen);
	glutPostRedisplay();
}

void drawOrientacao()
{

	glDisable(GL_TEXTURE_2D);
	//----------------------- OBSERVADOR
	glPushMatrix();
	glColor4f(VERDE);
	glTranslatef(obsPini[0], obsPini[1], obsPini[2]);
	glutSolidCube(1);
	glPopMatrix();
	glPushMatrix();
	glColor4f(PRETO);
	glTranslatef(obsPfin[0], obsPfin[1], obsPfin[2]);
	glutSolidCube(1.0);
	glPopMatrix();
}

void display(void)
{

	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

	//----------------------------------------- Viewport
	glViewport(wScreen / 5, 0, 0.75 * wScreen, hScreen);
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	gluPerspective(angPersp, (float)wScreen / hScreen, 0.1, 100.0);
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
	gluLookAt(obsPini[0], obsPini[1], obsPini[2], obsPfin[0], obsPfin[1], obsPfin[2], 0, 1, 0);

	drawEscada();
	plataforma2();
	drawColuna();

	glutSwapBuffers();
}

void updateVisao()
{

	obsPfin[0] = obsPini[0] + rVisao * cos(aVisao);
	obsPfin[2] = obsPini[2] - rVisao * sin(aVisao);
	glutPostRedisplay();
}

void keyboard(unsigned char key, int x, int y)
{
	switch (key)
	{
	//--------------------------- Escape
	case 27:
		exit(0);
		break;
	}
}

void teclasNotAscii(int key, int x, int y)
{
	if (key == GLUT_KEY_UP)
	{
		obsPini[0] = obsPini[0] + incVisao * cos(aVisao)*10;
		obsPini[2] = obsPini[2] - incVisao * sin(aVisao)*10;
	}
	if (key == GLUT_KEY_DOWN)
	{
		obsPini[0] = obsPini[0] - incVisao * cos(aVisao)*10;
		obsPini[2] = obsPini[2] + incVisao * sin(aVisao)*10;
	}
	if (key == GLUT_KEY_LEFT)
		aVisao = (aVisao + 0.01);
	if (key == GLUT_KEY_RIGHT)
		aVisao = (aVisao - 0.01);
	updateVisao();
}

void Timer(int value)
{
	glutPostRedisplay();
	glutTimerFunc(msec, Timer, 1);
}

//======================================================= MAIN
int main(int argc, char **argv)
{

	glutInit(&argc, argv);
	glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
	glutInitWindowSize(wScreen, hScreen);
	glutInitWindowPosition(400, 100);
	glutCreateWindow("Escadas Moumentais - Ines & David");

	init();
	glutSpecialFunc(teclasNotAscii);
	glutReshapeFunc(resize);
	glutDisplayFunc(display);
	glutKeyboardFunc(keyboard);
	glutTimerFunc(msec, Timer, 1);

	glutMainLoop();

	return 0;
}