import * as THREE from 'three';
const {
  document,
	window,
	HTMLCanvasElement,
	requestAnimationFrame,
	cancelAnimationFrame,
core,
	Event,
  Event0
} = THREE .DHTML

import { ParallaxBarrierEffect } from 'three/examples/jsm/effects/ParallaxBarrierEffect.js';
var requestId
Page({
	onUnload() {
		cancelAnimationFrame(requestId, this.canvas)
		this.worker && this.worker.terminate()
if(this.canvas) this.canvas = null
		setTimeout(() => {
			if (this.renderer instanceof THREE.WebGLRenderer) {
				this.renderer.dispose()
				this.renderer.forceContextLoss()
				this.renderer.context = null
				this.renderer.domElement = null
				this.renderer = null
			}
		}, 10)
	},
  webgl_touch(e){
		const web_e = (window.platform=="devtools"?Event:Event0).fix(e)
		this.canvas.dispatchEvent(web_e)
  },
  onLoad() {
		document.createElementAsync("canvas", "webgl2",this).then(canvas => {
      this.canvas = canvas
      this.body_load(canvas).then()
    })
  },
  async body_load(canvas3d) {

    let container, camera, scene, renderer, effect;

    const spheres = [];

    let mouseX = 0;
    let mouseY = 0;

    let windowHalfX = window.innerWidth / 2;
    let windowHalfY = window.innerHeight / 2;

    document.addEventListener( 'mousemove', onDocumentMouseMove );

    init();
    animate();

    function init() {

      container = document.createElement( 'div' );
      document.body.appendChild( container );

      camera = new THREE.PerspectiveCamera( 60, window.innerWidth / window.innerHeight, 0.01, 100 );
      camera.position.z = 3;

      const path = 'textures/cube/pisa/';
      const format = '.png';
      const urls = [
        path + 'px' + format, path + 'nx' + format,
        path + 'py' + format, path + 'ny' + format,
        path + 'pz' + format, path + 'nz' + format
      ];

      const textureCube = new THREE.CubeTextureLoader().load( urls );

      scene = new THREE.Scene();
      scene.background = textureCube;

      const geometry = new THREE.SphereGeometry( 0.1, 32, 16 );
      const material = new THREE.MeshBasicMaterial( { color: 0xffffff, envMap: textureCube } );

      for ( let i = 0; i < 500; i ++ ) {

        const mesh = new THREE.Mesh( geometry, material );

        mesh.position.x = Math.random() * 10 - 5;
        mesh.position.y = Math.random() * 10 - 5;
        mesh.position.z = Math.random() * 10 - 5;

        mesh.scale.x = mesh.scale.y = mesh.scale.z = Math.random() * 3 + 1;

        scene.add( mesh );

        spheres.push( mesh );

      }

      //

      renderer = new THREE.WebGLRenderer();
      renderer.setPixelRatio( window.devicePixelRatio );
      container.appendChild( renderer.domElement );

      const width = window.innerWidth || 2;
      const height = window.innerHeight || 2;

      effect = new ParallaxBarrierEffect( renderer );
      effect.setSize( width, height );

      //

      window.addEventListener( 'resize', onWindowResize );

    }

    function onWindowResize() {

      windowHalfX = window.innerWidth / 2;
      windowHalfY = window.innerHeight / 2;

      camera.aspect = window.innerWidth / window.innerHeight;
      camera.updateProjectionMatrix();

      effect.setSize( window.innerWidth, window.innerHeight );

    }

    function onDocumentMouseMove( event ) {

      mouseX = ( event.clientX - windowHalfX ) / 100;
      mouseY = ( event.clientY - windowHalfY ) / 100;

    }

    //

    function animate() {

      requestId = requestAnimationFrame( animate );

      render();

    }

    function render() {

      const timer = 0.0001 * Date.now();

      camera.position.x += ( mouseX - camera.position.x ) * .05;
      camera.position.y += ( - mouseY - camera.position.y ) * .05;

      camera.lookAt( scene.position );

      for ( let i = 0, il = spheres.length; i < il; i ++ ) {

        const sphere = spheres[ i ];

        sphere.position.x = 5 * Math.cos( timer + i );
        sphere.position.y = 5 * Math.sin( timer + i * 1.1 );

      }

      effect.render( scene, camera );

    }
  }
})