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';

import { OrbitControls } from 'three/examples/jsm/controls/OrbitControls.js';
import { OrbitControls0 } from 'three/examples/jsm/controls/OrbitControls0.js';
import { OutlineEffect } from 'three/examples/jsm/effects/OutlineEffect.js';
import { FontLoader } from 'three/examples/jsm/loaders/FontLoader.js';
import { TextGeometry } from 'three/examples/jsm/geometries/TextGeometry.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, effect;
    let particleLight;

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

      init( font );
      animate();

    } );

    function init( font ) {

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

      camera = new THREE.PerspectiveCamera( 40, window.innerWidth / window.innerHeight, 1, 2500 );
      camera.position.set( 0.0, 400, 400 * 3.5 );

      //

      scene = new THREE.Scene();
      scene.background = new THREE.Color( 0x444488 );

      //

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

      // Materials

      const cubeWidth = 400;
      const numberOfSphersPerSide = 5;
      const sphereRadius = ( cubeWidth / numberOfSphersPerSide ) * 0.8 * 0.5;
      const stepSize = 1.0 / numberOfSphersPerSide;
      const format = ( renderer.capabilities.isWebGL2 ) ? THREE.RedFormat : THREE.LuminanceFormat;

      const geometry = new THREE.SphereGeometry( sphereRadius, 32, 16 );

      for ( let alpha = 0, alphaIndex = 0; alpha <= 1.0; alpha += stepSize, alphaIndex ++ ) {

        const colors = new Uint8Array( alphaIndex + 2 );

        for ( let c = 0; c <= colors.length; c ++ ) {

          colors[ c ] = ( c / colors.length ) * 256;

        }

        const gradientMap = new THREE.DataTexture( colors, colors.length, 1, format );
        gradientMap.needsUpdate = true;

        for ( let beta = 0; beta <= 1.0; beta += stepSize ) {

          for ( let gamma = 0; gamma <= 1.0; gamma += stepSize ) {

            // basic monochromatic energy preservation
            const diffuseColor = new THREE.Color().setHSL( alpha, 0.5, gamma * 0.5 + 0.1 ).multiplyScalar( 1 - beta * 0.2 );

            const material = new THREE.MeshToonMaterial( {
              color: diffuseColor,
              gradientMap: gradientMap
            } );

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

            mesh.position.x = alpha * 400 - 200;
            mesh.position.y = beta * 400 - 200;
            mesh.position.z = gamma * 400 - 200;

            scene.add( mesh );

          }

        }

      }

      function addLabel( name, location ) {

        const textGeo = new TextGeometry( name, {

          font: font,

          size: 20,
          height: 1,
          curveSegments: 1

        } );

        const textMaterial = new THREE.MeshBasicMaterial();
        const textMesh = new THREE.Mesh( textGeo, textMaterial );
        textMesh.position.copy( location );
        scene.add( textMesh );

      }

      addLabel( '-gradientMap', new THREE.Vector3( - 350, 0, 0 ) );
      addLabel( '+gradientMap', new THREE.Vector3( 350, 0, 0 ) );

      addLabel( '-diffuse', new THREE.Vector3( 0, 0, - 300 ) );
      addLabel( '+diffuse', new THREE.Vector3( 0, 0, 300 ) );

      particleLight = new THREE.Mesh(
        new THREE.SphereGeometry( 4, 8, 8 ),
        new THREE.MeshBasicMaterial( { color: 0xffffff } )
      );
      scene.add( particleLight );

      // Lights

      scene.add( new THREE.AmbientLight( 0xc1c1c1, 3 ) );

      const pointLight = new THREE.PointLight( 0xffffff, 2, 800, 0 );
      particleLight.add( pointLight );

      //

      effect = new OutlineEffect( renderer );

      //

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

      const controls = new (window.platform=="devtools"?OrbitControls:OrbitControls0)( camera, renderer.domElement );
      controls.minDistance = 200;
      controls.maxDistance = 2000;

      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 );

      stats.begin();
      render();
      stats.end();

    }

    function render() {

      const timer = Date.now() * 0.00025;

      particleLight.position.x = Math.sin( timer * 7 ) * 300;
      particleLight.position.y = Math.cos( timer * 5 ) * 400;
      particleLight.position.z = Math.cos( timer * 3 ) * 300;

      effect.render( scene, camera );

    }

  }
})