class Vector3{
  constructor(x,y,z){
    this.x = x;
    this.y = y;
    this.z = z;
  }
}

class Vector2{
  constructor(x,y){
    this.x = x;
    this.y = y;
  }
}

function transformation(point, cam_pos, cam_angle, display){
  x = point.x - cam_pos.x;
  y = point.y - cam_pos.y;
  z = point.z - cam_pos.z;
  dx = Math.cos(cam_angle.y) * (Math.sin(cam_angle.z) * y + Math.cos(cam_angle.z) * x) - Math.sin(cam_angle.y) * z;
  dy = Math.sin(cam_angle.x) * (Math.cos(cam_angle.y) * z + Math.sin(cam_angle.y) * (Math.sin(cam_angle.z) * y + Math.cos(cam_angle.z) * x)) + Math.cos(cam_angle.x) * (Math.cos(cam_angle.z) * y - Math.sin(cam_angle.z) * x);
  dz = Math.cos(cam_angle.x) * (Math.cos(cam_angle.y) * z + Math.sin(cam_angle.y) * (Math.sin(cam_angle.z) * y + Math.cos(cam_angle.z) * x)) - Math.sin(cam_angle.x) * (Math.cos(cam_angle.z) * y - Math.sin(cam_angle.z) * x);

  bx = (display.z/dz) * dx + display.x;
  by = (display.z/dz) * dy + display.y;
  //console.log(x,y,z,dx,dy,dz,bx,by);
  point2D = new Vector2(bx,by);
  return point2D;
}

function rotatex(point, angle){
  xn = point.x;
  yn = point.y * Math.cos(angle) - point.z * Math.sin(angle);
  zn = point.y * Math.sin(angle) + point.z * Math.cos(angle);
  return new Vector3(xn,yn,zn);
}

function rotatey(point, angle){
  xn = point.z * Math.sin(angle) + point.x * Math.cos(angle);
  yn = point.y;
  zn = point.y * Math.cos(angle) - point.x * Math.sin(angle);
  return new Vector3(xn,yn,zn);
}

function rotateObject(vertices, angleX, angleY, angleZ){
  for (i = 0; i < vertices.length; i++){
    //vertices[i] = rotatex(vertices[i], angleX);
    vertices[i] = rotatey(vertices[i], angleY);
  }
  return vertices;
}

let a = 16;
let vertices  = [new Vector3(a,a,a), new Vector3(a,-a,a), new Vector3(-a, -a, a), new Vector3(-a,a,a), new Vector3(a,a,-a), new Vector3(a,-a,-a), new Vector3(-a,-a,-a), new Vector3(-a,a,-a) ];
let edges  = [new Vector2(1,2), new Vector2(2,3), new Vector2(3,4), new Vector2(4,1), new Vector2(5,6), new Vector2(6,7), new Vector2(7,8), new Vector2(8,5), new Vector2(1,5), new Vector2(2,6), new Vector2(3,7), new Vector2(4,8)];

let cam_angle = new Vector3(0,0,0);
let display   = new Vector3(128, 128, 256);
var cam_pos   = new Vector3(0, 0, 64);

function setup(){
  createCanvas(1100,750);
  frameRate(60);
}

let key = false;
let x_dir = 0;
let y_dir = 0;
let z_dir = 0;

function keyPressed(){
  if (keyCode === ENTER){
    key = !key;
  }
  if (keyCode == LEFT_ARROW){
    x_dir += -1;
  }
  if (keyCode == RIGHT_ARROW){
    x_dir += 1;
  }
  if (keyCode == UP_ARROW){
    y_dir += -1;
  }
  if (keyCode == DOWN_ARROW){
    y_dir += 1;
  }
  if (keyCode == 219){
    z_dir += 1;
  }
  if (keyCode == 221){
    z_dir -=1;
  }

  console.log(keyCode);
  if (keyCode == BACKSPACE){
    x_dir = 0;
    y_dir = 0;
    z_dir = 0;
  }
}

function draw(){


  //cam_pos.x += 1;
  if (key){
    background(0);
    //cam_angle.y -= 0.01;
    //cam_pos.x += x_dir*2;
    //cam_pos.y += y_dir*2;
    //cam_pos.z += z_dir*2;
    //console.log(vertices);
    vertices = rotateObject(vertices, 0.01 , 0.1);
    for (i = 0; i < edges.length; i++){
        var cur_edge = edges[i];
        var pixel1 = transformation(vertices[cur_edge.x - 1], cam_pos, cam_angle, display);
        var pixel2 = transformation(vertices[cur_edge.y - 1], cam_pos, cam_angle, display);
        stroke('green');
        line(pixel1.x | 0, pixel1.y | 0, pixel2.x | 0, pixel2.y | 0);
        console.log(pixel1.x | 0, pixel1.y | 0, pixel2.x | 0, pixel2.y | 0);
    }
  }
}