#include <Windows.h>

#include <gl/glew.h>
#include <gl/glut.h>

#include <iostream>

static int wWidth = 800;
static int wHeight = 600;
static float yfov = 45.0f;
static float zNear = 1.0f;
static float zFar = 1600.0f;

static float red[] = {
    0.63f,
    0.06f,
    0.04f,
    1.0f
};

static float green[] = {
    0.15f,
    0.48f,
    0.09f,
    1.0f
};

static float white[] = {
    0.76f,
    0.75f,
    0.5f,
    1.0f
};

using namespace std;

void SetupLights(void);

void ReshapeWindow(int width, int height);
void Render(void);

int main(int argc, char *argv[])
{

    glutInit(&argc, argv);
    glewInit();

    glutInitDisplayMode(GLUT_DEPTH | GLUT_RGBA | GLUT_DOUBLE);
    glutInitWindowSize(wWidth, wHeight);
    glutInitWindowPosition(100, 100);

    glutCreateWindow("wtf?");

    glutReshapeFunc(ReshapeWindow);
    glutDisplayFunc(Render);

    glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
    glEnable(GL_CULL_FACE);
    glCullFace(GL_BACK);

    SetupLights();

    glutMainLoop();


}

void SetupLights(void)
{

    glEnable(GL_LIGHTING);

    float lightPosition[] = {
        278.0f,
        425.0f,
        279.5f,
        0.0f
    };

    float lightIntensity[] = {
        0.75f,
        0.75f,
        0.75f,
        1.0f
    };

    float lightDirection[] = {
        0.0f,
        -1.0f,
        0.0f,
        0.0f // i think w component is not needed her but w/e
    };



    glLightfv(GL_LIGHT0, GL_POSITION, lightPosition);
    glLightfv(GL_LIGHT0, GL_AMBIENT_AND_DIFFUSE, lightIntensity);
    glLightfv(GL_LIGHT0, GL_SPECULAR, lightIntensity);

    glLightfv(GL_LIGHT0, GL_SPOT_DIRECTION, lightDirection);
    //glLightf(GL_LIGHT0, GL_SPOT_CUTOFF, 170.0f);
    //glLightf(GL_LIGHT0, GL_SPOT_EXPONENT, 128.0f);

    //glLighti(GL_LIGHT0, GL_CONSTANT_ATTENUATION, 1);
    //glLighti(GL_LIGHT0, GL_LINEAR_ATTENUATION, 1);
    //glLighti(GL_LIGHT0, GL_QUADRATIC_ATTENUATION, 1);

    glEnable(GL_LIGHT0);

}

void ReshapeWindow(int width, int height)
{

    float ratio = (float) width / height;

    glMatrixMode(GL_PROJECTION);

    gluPerspective(yfov, ratio, zNear, zFar);
    gluLookAt(278.0f, 273.0f, -800.0f, 278.0f, 273.0f, -799.0f, 0.0f, 1.0f, 0.0f);

    glMatrixMode(GL_MODELVIEW);

}

void Render(void)
{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);


    glBegin(GL_TRIANGLES);

        // CEILING

        glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, white);
        glMaterialfv(GL_FRONT, GL_SPECULAR, white);

        glNormal3f(0.0f, -1.0f, 0.0f);

        glVertex3f(556.0f, 548.8f, 0.0f);
        glVertex3f(556.0f, 548.0f, 592.2f);
        glVertex3f(0.0f, 548.8f, 0.0f);

        glVertex3f(556.0f, 548.0f, 592.2f);
        glVertex3f(0.0f, 548.8f, 592.2f);
        glVertex3f(0.0f, 548.8f, 0.0f);

        // FLOOR

        glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, white);
        glMaterialfv(GL_FRONT, GL_SPECULAR, white);

        glNormal3f(0.0f, 1.0f, 0.0f);

        glVertex3f(552.8, 0.0f, 0.0f);
        glVertex3f(0.0f, 0.0f, 0.0f);
        glVertex3f(549.6f, 0.0f, 592.2f);

        glVertex3f(0.0f, 0.0f, 0.0f);
        glVertex3f(0.0f, 0.0f, 592.2f);
        glVertex3f(549.6f, 0.0f, 592.2f);

        // BACK WALL

        glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, white);
        glMaterialfv(GL_FRONT, GL_SPECULAR, white);

        glNormal3f(0.0f, 0.0f, -1.0f);

        glVertex3f(549.6, 0.0f, 592.2f);
        glVertex3f(0.0f, 0.0f, 592.2f);
        glVertex3f(556.0f, 548.8f, 592.2f);

        glVertex3f(0.0f, 0.0f, 592.2f);
        glVertex3f(0.0f, 548.8f, 592.2f);
        glVertex3f(556.0f, 548.8f, 592.2f);

        // LEFT WALL

        glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, red);
        glMaterialfv(GL_FRONT, GL_SPECULAR, red);

        glNormal3f(-1.0f, 0.0f, 0.0f);

        glVertex3f(552.8f, 0.0f, 0.0f);
        glVertex3f(549.6f, 0.0f, 592.2f);
        glVertex3f(556.0f, 548.8f, 0.0f);

        glVertex3f(549.6f, 0.0f, 592.2f);
        glVertex3f(556.0f, 548.8f, 592.2f);
        glVertex3f(556.0f, 548.8f, 0.0f);

        // RIGHT WALL

        glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, green);
        glMaterialfv(GL_FRONT, GL_SPECULAR, green);

        glNormal3f(1.0f, 0.0f, 0.0f);

        glVertex3f(0.0f, 0.0f, 592.2f);
        glVertex3f(0.0f, 0.0f, 0.0f);
        glVertex3f(0.0f, 548.8f, 592.2f);

        glVertex3f(0.0f, 0.0f, 0.0f);
        glVertex3f(0.0f, 548.8f, 0.0f);
        glVertex3f(0.0f, 548.8f, 592.2f);

    glEnd();

    glutSwapBuffers();

}