var SEPARATION = 100,
  AMOUNTX = 50,
  AMOUNTY = 50;

var container;
var parentContainer;
var camera, scene, renderer;

var particles,
  particle,
  count = 0;

var mouseX = 0,
  mouseY = 0;
parentContainer = document.getElementById("bgMask");
var windowHalfX = window.innerWidth / 2;
var windowHalfY = parseInt(parentContainer.style.height) / 2;

init();
animate();

function init() {
  parentContainer = document.getElementById("bgMask");
  // container = document.createElement('div');
  // parentContainer.appendChild(container);

  camera = new THREE.PerspectiveCamera(
    50,
    window.innerWidth / parseInt(parentContainer.style.height),
    30,
    10000
  );
  camera.position.y = 500;
  camera.position.z = 1000;

  scene = new THREE.Scene();

  particles = new Array();

  var PI2 = Math.PI * 2;
  var material = new THREE.ParticleCanvasMaterial({
    color: 0xffffff,
    opacity: 0.9,
    program: function (context) {
      context.beginPath();
      context.arc(0, 0, 0.3, 0, PI2, true);
      context.fill();
    },
  });

  var i = 0;

  for (var ix = 0; ix < AMOUNTX; ix++) {
    for (var iy = 0; iy < AMOUNTY; iy++) {
      particle = particles[i++] = new THREE.Particle(material);
      particle.position.x = ix * SEPARATION - (AMOUNTX * SEPARATION) / 2;
      particle.position.z = iy * SEPARATION - (AMOUNTY * SEPARATION) / 2;
      scene.add(particle);
    }
  }

  renderer = new THREE.CanvasRenderer({
    alpha: true,
    antialias: true,
    preserveDrawingBuffer: true,
  });
  // renderer.setPixelRatio(window.devicePixelRatio);
  renderer.setSize(window.innerWidth, parseInt(parentContainer.style.height));
  console.log(parentContainer.style.height);
  parentContainer.appendChild(renderer.domElement);

  document.addEventListener("mousemove", onDocumentMouseMove, false);
  document.addEventListener("touchstart", onDocumentTouchStart, false);
  document.addEventListener("touchmove", onDocumentTouchMove, false);

  //

  window.addEventListener("resize", onWindowResize, false);
}

function onWindowResize() {
  windowHalfX = window.innerWidth / 2;
  windowHalfY = parseInt(parentContainer.style.height) / 2;
  camera.aspect = window.innerWidth / parseInt(parentContainer.style.height);
  camera.updateProjectionMatrix();
  renderer.setSize(window.innerWidth, 750);
}

//

function onDocumentMouseMove(event) {
  mouseX = event.clientX - windowHalfX;
  // mouseY = event.clientY - windowHalfY;
}

function onDocumentTouchStart(event) {
  if (event.touches.length === 1) {
    event.preventDefault();

    mouseX = event.touches[0].pageX - windowHalfX;
    // mouseY = event.touches[0].pageY - windowHalfY;
  }
}

function onDocumentTouchMove(event) {
  if (event.touches.length === 1) {
    event.preventDefault();

    mouseX = event.touches[0].pageX - windowHalfX;
    // mouseY = event.touches[0].pageY - windowHalfY;
  }
}

//

function animate() {
  requestAnimationFrame(animate);

  render();
}

function render() {
  camera.position.x += (mouseX - camera.position.x) * 0.05;
  camera.position.y += (-mouseY - camera.position.y + 200) * 0.05;
  camera.lookAt(scene.position);

  var i = 0;

  for (var ix = 0; ix < AMOUNTX; ix++) {
    for (var iy = 0; iy < AMOUNTY; iy++) {
      particle = particles[i++];
      particle.position.y =
        Math.sin((ix + count) * 0.3) * 50 + Math.sin((iy + count) * 0.5) * 50;
      particle.scale.x = particle.scale.y =
        (Math.sin((ix + count) * 0.3) + 1) * 4 +
        (Math.sin((iy + count) * 0.5) + 1) * 4;
    }
  }

  renderer.render(scene, camera);

  count += 0.1;
}
window.onscroll = function (e) {
  var e = e || window.event;
  var scrolltop = document.documentElement.scrollTop || document.body.scrollTop;
  var height = $(".i-intro").height();
  if (scrolltop >= height) {
    AMOUNTX = 0;
  } else {
    AMOUNTX = 50;
  }
};