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

import { GUI } from 'three/examples/jsm/libs/lil-gui.module.min.js';
import { OrbitControls } from 'three/examples/jsm/controls/OrbitControls.js';
import { OrbitControls0 } from 'three/examples/jsm/controls/OrbitControls0.js';
import { GLTFLoader } from 'three/examples/jsm/loaders/GLTFLoader.js';
import { RGBELoader } from 'three/examples/jsm/loaders/RGBELoader.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 camera, scene, renderer;
    let gui;

    const state = { variant: 'midnight' };

    init();
    render();

    function init() {

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

      camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 0.25, 20 );
      camera.position.set( 2.5, 1.5, 3.0 );

      scene = new THREE.Scene();

      new RGBELoader()
        .setPath( 'textures/equirectangular/' )
        .load( 'quarry_01_1k.hdr', function ( texture ) {

          texture.mapping = THREE.EquirectangularReflectionMapping;

          scene.background = texture;
          scene.environment = texture;

          render();

          // model

          const loader = new GLTFLoader().setPath( 'models/gltf/MaterialsVariantsShoe/glTF/' );
          loader.load( 'MaterialsVariantsShoe.gltf', function ( gltf ) {

            gltf.scene.scale.set( 10.0, 10.0, 10.0 );

            scene.add( gltf.scene );

            // GUI
            gui = new GUI();

            // Details of the KHR_materials_variants extension used here can be found below
            // https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_materials_variants
            const parser = gltf.parser;
            const variantsExtension = gltf.userData.gltfExtensions[ 'KHR_materials_variants' ];
            const variants = variantsExtension.variants.map( ( variant ) => variant.name );
            const variantsCtrl = gui.add( state, 'variant', variants ).name( 'Variant' );

            selectVariant( scene, parser, variantsExtension, state.variant );

            variantsCtrl.onChange( ( value ) => selectVariant( scene, parser, variantsExtension, value ) );

            render();

          } );

        } );

      renderer = new THREE.WebGLRenderer( { antialias: true } );
      renderer.setPixelRatio( window.devicePixelRatio );
      renderer.setSize( window.innerWidth, window.innerHeight );
      renderer.toneMapping = THREE.ACESFilmicToneMapping;
      renderer.toneMappingExposure = 1;
      container.appendChild( renderer.domElement );

      const controls = new (window.platform=="devtools"?OrbitControls:OrbitControls0)( camera, renderer.domElement );
      controls.addEventListener( 'change', render ); // use if there is no animation loop
      controls.minDistance = 2;
      controls.maxDistance = 10;
      controls.target.set( 0, 0.5, - 0.2 );
      controls.update();

      window.addEventListener( 'resize', onWindowResize );

    }

    function selectVariant( scene, parser, extension, variantName ) {

      const variantIndex = extension.variants.findIndex( ( v ) => v.name.includes( variantName ) );

      scene.traverse( async ( object ) => {

        if ( ! object.isMesh || ! object.userData.gltfExtensions ) return;

        const meshVariantDef = object.userData.gltfExtensions[ 'KHR_materials_variants' ];

        if ( ! meshVariantDef ) return;

        if ( ! object.userData.originalMaterial ) {

          object.userData.originalMaterial = object.material;

        }

        const mapping = meshVariantDef.mappings
          .find( ( mapping ) => mapping.variants.includes( variantIndex ) );

        if ( mapping ) {

          object.material = await parser.getDependency( 'material', mapping.material );
          parser.assignFinalMaterial( object );

        } else {

          object.material = object.userData.originalMaterial;

        }

        render();

      } );

    }

    function onWindowResize() {

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

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

      render();

    }

    //

    function render() {

      renderer.render( scene, camera );

    }
  }
})