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

  import { FontLoader } from 'three/examples/jsm/loaders/FontLoader.js';
  import { TextGeometry } from 'three/examples/jsm/geometries/TextGeometry.js';

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

const vertexshader = `

uniform float amplitude;

attribute vec3 displacement;
attribute vec3 customColor;

varying vec3 vColor;

void main() {

  vec3 newPosition = position + amplitude * displacement;

  vColor = customColor;

  gl_Position = projectionMatrix * modelViewMatrix * vec4( newPosition, 1.0 );

}`

const fragmentshader = `

uniform vec3 color;
uniform float opacity;

varying vec3 vColor;

void main() {

  gl_FragColor = vec4( vColor * color, opacity );

}
`
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 line, uniforms;

			const loader = new FontLoader();
			loader.load( 'fonts/helvetiker_bold.typeface.json', function ( font ) {

				init( font );
				animate();

			} );

			function init( font ) {

				camera = new THREE.PerspectiveCamera( 30, window.innerWidth / window.innerHeight, 1, 10000 );
				camera.position.z = 400;

				scene = new THREE.Scene();
				scene.background = new THREE.Color( 0x050505 );

				uniforms = {

					amplitude: { value: 5.0 },
					opacity: { value: 0.3 },
					color: { value: new THREE.Color( 0xffffff ) }

				};

				const shaderMaterial = new THREE.ShaderMaterial( {

					uniforms: uniforms,
					vertexShader: vertexshader,
					fragmentShader: fragmentshader,
					blending: THREE.AdditiveBlending,
					depthTest: false,
					transparent: true

				} );


				const geometry = new TextGeometry( 'three.js', {

					font: font,

					size: 50,
					height: 15,
					curveSegments: 10,

					bevelThickness: 5,
					bevelSize: 1.5,
					bevelEnabled: true,
					bevelSegments: 10,

				} );

				geometry.center();

				const count = geometry.attributes.position.count;

				const displacement = new THREE.Float32BufferAttribute( count * 3, 3 );
				geometry.setAttribute( 'displacement', displacement );

				const customColor = new THREE.Float32BufferAttribute( count * 3, 3 );
				geometry.setAttribute( 'customColor', customColor );

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

				for ( let i = 0, l = customColor.count; i < l; i ++ ) {

					color.setHSL( i / l, 0.5, 0.5 );
					color.toArray( customColor.array, i * customColor.itemSize );

				}

				line = new THREE.Line( geometry, shaderMaterial );
				line.rotation.x = 0.2;
				scene.add( line );

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

				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() * 0.001;

				line.rotation.y = 0.25 * time;

				uniforms.amplitude.value = Math.sin( 0.5 * time );
				uniforms.color.value.offsetHSL( 0.0005, 0, 0 );

				const attributes = line.geometry.attributes;
				const array = attributes.displacement.array;

				for ( let i = 0, l = array.length; i < l; i += 3 ) {

					array[ i ] += 0.3 * ( 0.5 - Math.random() );
					array[ i + 1 ] += 0.3 * ( 0.5 - Math.random() );
					array[ i + 2 ] += 0.3 * ( 0.5 - Math.random() );

				}

				attributes.displacement.needsUpdate = true;

				renderer.render( scene, camera );

			}
  }
})