import * as THREE from 'three';
const {
  document,
	window,
	HTMLCanvasElement,
	requestAnimationFrame,
	cancelAnimationFrame,
core,
	Event,
  Event0
} = THREE .DHTML
import { OrbitControls } from 'three/examples/jsm/controls/OrbitControls.js';
import { OrbitControls0 } from 'three/examples/jsm/controls/OrbitControls0.js';
import { DRACOExporter } from 'three/examples/jsm/exporters/DRACOExporter.js';
import { GUI } from 'three/examples/jsm/libs/lil-gui.module.min.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 scene, camera, renderer, exporter, mesh;

    const params = {
      export: exportFile
    };

    init();
    animate();

    function init() {

      camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 0.1, 100 );
      camera.position.set( 4, 2, 4 );

      scene = new THREE.Scene();
      scene.background = new THREE.Color( 0xa0a0a0 );
      scene.fog = new THREE.Fog( 0xa0a0a0, 4, 20 );

      exporter = new DRACOExporter();

      //

      const hemiLight = new THREE.HemisphereLight( 0xffffff, 0x444444, 3 );
      hemiLight.position.set( 0, 20, 0 );
      scene.add( hemiLight );

      const directionalLight = new THREE.DirectionalLight( 0xffffff, 3 );
      directionalLight.position.set( 0, 20, 10 );
      directionalLight.castShadow = true;
      directionalLight.shadow.camera.top = 2;
      directionalLight.shadow.camera.bottom = - 2;
      directionalLight.shadow.camera.left = - 2;
      directionalLight.shadow.camera.right = 2;
      scene.add( directionalLight );

      // ground

      const ground = new THREE.Mesh( new THREE.PlaneGeometry( 40, 40 ), new THREE.MeshPhongMaterial( { color: 0xbbbbbb, depthWrite: false } ) );
      ground.rotation.x = - Math.PI / 2;
      ground.receiveShadow = true;
      scene.add( ground );

      const grid = new THREE.GridHelper( 40, 20, 0x000000, 0x000000 );
      grid.material.opacity = 0.2;
      grid.material.transparent = true;
      scene.add( grid );

      // export mesh

      const geometry = new THREE.TorusKnotGeometry( 0.75, 0.2, 200, 30 );
      const material = new THREE.MeshPhongMaterial( { color: 0x00ff00 } );
      mesh = new THREE.Mesh( geometry, material );
      mesh.castShadow = true;
      mesh.position.y = 1.5;
      scene.add( mesh );

      //

      renderer = new THREE.WebGLRenderer( { antialias: true } );
      renderer.setPixelRatio( window.devicePixelRatio );
      renderer.setSize( window.innerWidth, window.innerHeight );
      renderer.shadowMap.enabled = true;
      document.body.appendChild( renderer.domElement );

      //

      const controls = new (window.platform=="devtools"?OrbitControls:OrbitControls0)( camera, renderer.domElement );
      controls.target.set( 0, 1.5, 0 );
      controls.update();

      //

      window.addEventListener( 'resize', onWindowResize );

      const gui = new GUI();

      gui.add( params, 'export' ).name( 'Export DRC' );
      gui.open();


    }

    function onWindowResize() {

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

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

    }

    function animate() {

      requestId = requestAnimationFrame( animate );
      renderer.render( scene, camera );

    }

    function exportFile() {

      const result = exporter.parse( mesh );
      saveArrayBuffer( result, 'file.drc' );

    }

    const link = document.createElement( 'a' );
    link.style.display = 'none';
    document.body.appendChild( link );

    function save( blob, filename ) {

      link.href = URL.createObjectURL( blob );
      link.download = filename;
      link.click();

    }

    function saveArrayBuffer( buffer, filename ) {

      save( new Blob( [ buffer ], { type: 'application/octet-stream' } ), filename );

    }

  }
})