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

  import Stats from 'three/examples/jsm/libs/stats.module.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, stats;

			let camera, scene, renderer;

			let mesh;

			init();
			animate();

			function init() {

				container = document.getElementById( 'container' );

				//

				camera = new THREE.PerspectiveCamera( 27, window.innerWidth / window.innerHeight, 1, 3500 );
				camera.position.z = 2750;

				scene = new THREE.Scene();
				scene.background = new THREE.Color( 0x050505 );
				scene.fog = new THREE.Fog( 0x050505, 2000, 3500 );

				//

				scene.add( new THREE.AmbientLight( 0xcccccc ) );

				const light1 = new THREE.DirectionalLight( 0xffffff, 1.5 );
				light1.position.set( 1, 1, 1 );
				scene.add( light1 );

				const light2 = new THREE.DirectionalLight( 0xffffff, 4.5 );
				light2.position.set( 0, - 1, 0 );
				scene.add( light2 );

				//

				const triangles = 500000;

				const geometry = new THREE.BufferGeometry();

				const positions = [];
				const normals = [];
				const colors = [];

				const color = new THREE.Color();

				const n = 800, n2 = n / 2;	// triangles spread in the cube
				const d = 12, d2 = d / 2;	// individual triangle size

				const pA = new THREE.Vector3();
				const pB = new THREE.Vector3();
				const pC = new THREE.Vector3();

				const cb = new THREE.Vector3();
				const ab = new THREE.Vector3();

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

					// positions

					const x = Math.random() * n - n2;
					const y = Math.random() * n - n2;
					const z = Math.random() * n - n2;

					const ax = x + Math.random() * d - d2;
					const ay = y + Math.random() * d - d2;
					const az = z + Math.random() * d - d2;

					const bx = x + Math.random() * d - d2;
					const by = y + Math.random() * d - d2;
					const bz = z + Math.random() * d - d2;

					const cx = x + Math.random() * d - d2;
					const cy = y + Math.random() * d - d2;
					const cz = z + Math.random() * d - d2;

					positions.push( ax, ay, az );
					positions.push( bx, by, bz );
					positions.push( cx, cy, cz );

					// flat face normals

					pA.set( ax, ay, az );
					pB.set( bx, by, bz );
					pC.set( cx, cy, cz );

					cb.subVectors( pC, pB );
					ab.subVectors( pA, pB );
					cb.cross( ab );

					cb.normalize();

					const nx = cb.x;
					const ny = cb.y;
					const nz = cb.z;

					normals.push( nx * 32767, ny * 32767, nz * 32767 );
					normals.push( nx * 32767, ny * 32767, nz * 32767 );
					normals.push( nx * 32767, ny * 32767, nz * 32767 );

					// colors

					const vx = ( x / n ) + 0.5;
					const vy = ( y / n ) + 0.5;
					const vz = ( z / n ) + 0.5;

					color.setRGB( vx, vy, vz );

					colors.push( color.r * 255, color.g * 255, color.b * 255 );
					colors.push( color.r * 255, color.g * 255, color.b * 255 );
					colors.push( color.r * 255, color.g * 255, color.b * 255 );

				}

				const positionAttribute = new THREE.Float32BufferAttribute( positions, 3 );
				const normalAttribute = new THREE.Int16BufferAttribute( normals, 3 );
				const colorAttribute = new THREE.Uint8BufferAttribute( colors, 3 );

				normalAttribute.normalized = true; // this will map the buffer values to 0.0f - +1.0f in the shader
				colorAttribute.normalized = true;

				geometry.setAttribute( 'position', positionAttribute );
				geometry.setAttribute( 'normal', normalAttribute );
				geometry.setAttribute( 'color', colorAttribute );

				geometry.computeBoundingSphere();

				const material = new THREE.MeshPhongMaterial( {
					color: 0xd5d5d5, specular: 0xffffff, shininess: 250,
					side: THREE.DoubleSide, vertexColors: true
				} );

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

				//

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

				//

				stats = new Stats();
				container.appendChild( stats.dom );

				//

				window.addEventListener( 'resize', onWindowResize );

			}

			function onWindowResize() {

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

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

			}

			//

			function animate() {

				requestId = requestAnimationFrame( animate );

				render();
				stats.update();

			}

			function render() {

				const time = Date.now() * 0.001;

				mesh.rotation.x = time * 0.25;
				mesh.rotation.y = time * 0.5;

				renderer.render( scene, camera );

			}
  }
})