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

import Stats from 'three/examples/jsm/libs/stats.module.js';
const vertexshader = `

uniform float amplitude;

attribute float displacement;

varying vec3 vNormal;
varying vec2 vUv;

void main() {

  vNormal = normal;
  vUv = ( 0.5 + amplitude ) * uv + vec2( amplitude );

  vec3 newPosition = position + amplitude * normal * vec3( displacement );
  gl_Position = projectionMatrix * modelViewMatrix * vec4( newPosition, 1.0 );

}
`
const fragmentshader = `

varying vec3 vNormal;
varying vec2 vUv;

uniform vec3 color;
uniform sampler2D colorTexture;

void main() {

  vec3 light = vec3( 0.5, 0.2, 1.0 );
  light = normalize( light );

  float dProd = dot( vNormal, light ) * 0.5 + 0.5;

  vec4 tcolor = texture2D( colorTexture, vUv );
  vec4 gray = vec4( vec3( tcolor.r * 0.3 + tcolor.g * 0.59 + tcolor.b * 0.11 ), 1.0 );

  gl_FragColor = gray * vec4( vec3( dProd ) * vec3( color ), 1.0 );

}
`
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, uniforms;

			let displacement, noise;

			init();
			animate();

			function init() {

				camera = new THREE.PerspectiveCamera( 30, window.innerWidth / window.innerHeight, 1, 10000 );
				camera.position.z = 300;

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

				uniforms = {

					'amplitude': { value: 1.0 },
					'color': { value: new THREE.Color( 0xff2200 ) },
					'colorTexture': { value: new THREE.TextureLoader().load( 'textures/water.jpg' ) }

				};

				uniforms[ 'colorTexture' ].value.wrapS = uniforms[ 'colorTexture' ].value.wrapT = THREE.RepeatWrapping;

				const shaderMaterial = new THREE.ShaderMaterial( {

					uniforms: uniforms,
					vertexShader:vertexshader,
					fragmentShader:fragmentshader

				} );


				const radius = 50, segments = 128, rings = 64;

				const geometry = new THREE.SphereGeometry( radius, segments, rings );

				displacement = new Float32Array( geometry.attributes.position.count );
				noise = new Float32Array( geometry.attributes.position.count );

				for ( let i = 0; i < displacement.length; i ++ ) {

					noise[ i ] = Math.random() * 5;

				}

				geometry.setAttribute( 'displacement', new THREE.BufferAttribute( displacement, 1 ) );

				sphere = new THREE.Mesh( geometry, shaderMaterial );
				scene.add( sphere );

				renderer = new THREE.WebGLRenderer();
				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() * 0.01;

				sphere.rotation.y = sphere.rotation.z = 0.01 * time;

				uniforms[ 'amplitude' ].value = 2.5 * Math.sin( sphere.rotation.y * 0.125 );
				uniforms[ 'color' ].value.offsetHSL( 0.0005, 0, 0 );

				for ( let i = 0; i < displacement.length; i ++ ) {

					displacement[ i ] = Math.sin( 0.1 * i + time );

					noise[ i ] += 0.5 * ( 0.5 - Math.random() );
					noise[ i ] = THREE.MathUtils.clamp( noise[ i ], - 5, 5 );

					displacement[ i ] += noise[ i ];

				}

				sphere.geometry.attributes.displacement.needsUpdate = true;

				renderer.render( scene, camera );

			}
  }
})