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';
const vertexshader = `

attribute float size;
attribute vec3 customColor;

varying vec3 vColor;

void main() {

  vColor = customColor;

  vec4 mvPosition = modelViewMatrix * vec4( position, 1.0 );

  gl_PointSize = size * ( 300.0 / -mvPosition.z );

  gl_Position = projectionMatrix * mvPosition;

}
`

const fragmentshader=  `

uniform vec3 color;
uniform sampler2D pointTexture;

varying vec3 vColor;

void main() {

  gl_FragColor = vec4( color * vColor, 1.0 );
  gl_FragColor = gl_FragColor * texture2D( pointTexture, gl_PointCoord );

}
`

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 renderer, scene, camera, stats;

			let sphere;

			const WIDTH = window.innerWidth;
			const HEIGHT = window.innerHeight;

			init();
			animate();

			function init() {

				camera = new THREE.PerspectiveCamera( 40, WIDTH / HEIGHT, 1, 10000 );
				camera.position.z = 300;

				scene = new THREE.Scene();

				const amount = 100000;
				const radius = 200;

				const positions = new Float32Array( amount * 3 );
				const colors = new Float32Array( amount * 3 );
				const sizes = new Float32Array( amount );

				const vertex = new THREE.Vector3();
				const color = new THREE.Color( 0xffffff );

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

					vertex.x = ( Math.random() * 2 - 1 ) * radius;
					vertex.y = ( Math.random() * 2 - 1 ) * radius;
					vertex.z = ( Math.random() * 2 - 1 ) * radius;
					vertex.toArray( positions, i * 3 );

					if ( vertex.x < 0 ) {

						color.setHSL( 0.5 + 0.1 * ( i / amount ), 0.7, 0.5 );

					} else {

						color.setHSL( 0.0 + 0.1 * ( i / amount ), 0.9, 0.5 );

					}

					color.toArray( colors, i * 3 );

					sizes[ i ] = 10;

				}

				const geometry = new THREE.BufferGeometry();
				geometry.setAttribute( 'position', new THREE.BufferAttribute( positions, 3 ) );
				geometry.setAttribute( 'customColor', new THREE.BufferAttribute( colors, 3 ) );
				geometry.setAttribute( 'size', new THREE.BufferAttribute( sizes, 1 ) );

				//

				const material = new THREE.ShaderMaterial( {

					uniforms: {
						color: { value: new THREE.Color( 0xffffff ) },
						pointTexture: { value: new THREE.TextureLoader().load( 'textures/sprites/spark1.png' ) }
					},
					vertexShader:vertexshader,
					fragmentShader:fragmentshader,

					blending: THREE.AdditiveBlending,
					depthTest: false,
					transparent: true

				} );

				//

				sphere = new THREE.Points( geometry, material );
				scene.add( sphere );

				//

				renderer = new THREE.WebGLRenderer();
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( WIDTH, HEIGHT );

				const container = document.getElementById( 'container' );
				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() * 0.005;

				sphere.rotation.z = 0.01 * time;

				const geometry = sphere.geometry;
				const attributes = geometry.attributes;

				for ( let i = 0; i < attributes.size.array.length; i ++ ) {

					attributes.size.array[ i ] = 14 + 13 * Math.sin( 0.1 * i + time );

				}

				attributes.size.needsUpdate = true;

				renderer.render( scene, camera );

			}
  }
})