//#include <GL/glut.h>

#include "Input.h"
#include "Renderer.h"
#include "structs.h"
#include "defs.h"

#include <math.h>

GLvoid menu ( int value ) {
    switch (value) {
        case MENU_SHADOWS:
            keyboard_event('a',0,0);
            break;
        case MENU_PRIMITIVES_ONLY:
            keyboard_event('p',0,0);
            break;
        case MENU_SHADOW_VOLUMES:
            keyboard_event('v',0,0);
            break;
        case MENU_CLEAR_WHITE:
            keyboard_event('x',0,0);
            break;
        case MENU_CLEAR_BLACK:
            keyboard_event('c',0,0);
            break;
        default:
            break;
    }

}

GLvoid keyboard_event(GLubyte key, GLint x, GLint y) {
    switch (key) {
        case 'w':
            *(Renderer::getInstance()->getViewAngle())-=.5;
            glutPostRedisplay();
            break;
        case 's':
            *(Renderer::getInstance()->getViewAngle())+=.5;
            glutPostRedisplay();
            break;
        case 'f':
            Renderer::getInstance()->backFaceCull = false;
            glCullFace(GL_FRONT);
            glutPostRedisplay();
            break;
        case 'b':
            Renderer::getInstance()->backFaceCull = true;
            glCullFace(GL_BACK);
            glutPostRedisplay();
            break;
        case 'p':
            Renderer::getInstance()->primitivesOnly = true;
            Renderer::getInstance()->drawShadows = false;
            glutPostRedisplay();
            break;
        case 'v':
            Renderer::getInstance()->drawShadows = false;
            Renderer::getInstance()->primitivesOnly = false;
            glutPostRedisplay();
            break;
        case 'a':
            Renderer::getInstance()->drawShadows = true;
            Renderer::getInstance()->primitivesOnly = false;
            glutPostRedisplay();
            break;
        case 'x':
            glClearColor(1,1,1,1.0);
            glutPostRedisplay();
            break;
        case 'c':
            glClearColor(0,0,0,1.0);
            glutPostRedisplay();
            break;
        default:
            break;
            
    };
}

/*
 * Convert screen coordinates to Trackball Coordinates
 */
inline void scalePoint(Point& p, GLint mx, GLint my) {
    m_int vpd = Renderer::getInstance()->getVPD();

    //scale to -1 and 1
    float scale = ceil(vpd/2.);
    p.x = (mx / scale) -1.;
    p.y = (my / scale) -1.;
    p.y*=-1.; //handle reversed y

    p.z = 1.-pow(p.x,2)-pow(p.y,2);

    if (p.z < 0) {
        float under = sqrt((p.x*p.x)+(p.y*p.y));
        p.x /= under;
        p.y /= under;
        p.z = 0;
    } else {
        p.z = sqrt(p.z);
    }

}



GLvoid button_motion(GLint mx, GLint my) {
    Point scaledPoint;
    static Point oldPoint;

    Light* light = Renderer::getInstance()->lights->front();

    scalePoint(scaledPoint, mx, my);

    
    light->center.x = scaledPoint.x * Renderer::getInstance()->distanceToCenter.z;
    light->center.y = scaledPoint.y * Renderer::getInstance()->distanceToCenter.z;
    light->center.z = scaledPoint.z * Renderer::getInstance()->distanceToCenter.z;

    if (Renderer::getInstance()->viewport.z - Renderer::getInstance()->l.z < 0) {
        light->center.y *= -1.;
    }

    glutPostRedisplay();

}

GLvoid passive_motion(GLint mx, GLint my) {

}

GLvoid mouse_button(GLint btn, GLint state, GLint mx, GLint my) {
    
}

GLvoid keyboard_special_event(GLint key, GLint x, GLint y) {
    switch (key) {
        case GLUT_KEY_UP:
            Renderer::getInstance()->lights->front()->center.z+=.5;
            glutPostRedisplay();
            break;
        case GLUT_KEY_DOWN:
            Renderer::getInstance()->lights->front()->center.z-=.5;
            glutPostRedisplay();
            break;
        case GLUT_KEY_LEFT:
            Renderer::getInstance()->lights->front()->center.x+=.5;
            glutPostRedisplay();
            break;
        case GLUT_KEY_RIGHT:
            Renderer::getInstance()->lights->front()->center.x-=.5;
            glutPostRedisplay();
            break;
        case GLUT_KEY_PAGE_UP:
            Renderer::getInstance()->lights->front()->center.y+=.5;
            glutPostRedisplay();
            break;
        case GLUT_KEY_PAGE_DOWN:
            Renderer::getInstance()->lights->front()->center.y-=.5;
            glutPostRedisplay();
            break;
    }
}