import * as THREE from 'three';
const {
  document,
	window,
	HTMLCanvasElement,
	requestAnimationFrame,
	cancelAnimationFrame,
core,
	Event,
  Event0
} = THREE.DHTML
import { GLTFLoader } from 'three/examples/jsm/loaders/GLTFLoader.js';

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 camera, scene, renderer, stats, mesh, mixer, dummy;

    const offset = 5000;

    const timeOffsets = new Float32Array( 1024 );

    for ( let i = 0; i < 1024; i ++ ) {

      timeOffsets[ i ] = Math.random() * 3;

    }

    const clock = new THREE.Clock( true );

    init();
    animate();

    function init() {

      camera = new THREE.PerspectiveCamera( 60, window.innerWidth / window.innerHeight, 100, 10000 );

      scene = new THREE.Scene();

      scene.background = new THREE.Color( 0x99DDFF );

      scene.fog = new THREE.Fog( 0x99DDFF, 5000, 10000 );

      const light = new THREE.DirectionalLight( 0xffffff, 1 );

      light.position.set( 200, 1000, 50 );

      light.castShadow = true;

      light.shadow.camera.left = - 5000;
      light.shadow.camera.right = 5000;
      light.shadow.camera.top = 5000;
      light.shadow.camera.bottom = - 5000;
      light.shadow.camera.far = 2000;

      light.shadow.bias = - 0.01;

      light.shadow.camera.updateProjectionMatrix();

      scene.add( light );

      const hemi = new THREE.HemisphereLight( 0x99DDFF, 0x669933, 1 / 3 );

      scene.add( hemi );

      const ground = new THREE.Mesh(
        new THREE.PlaneGeometry( 1000000, 1000000 ),
        new THREE.MeshStandardMaterial( { color: 0x669933, depthWrite: true } )
      );

      ground.rotation.x = - Math.PI / 2;

      ground.receiveShadow = true;

      scene.add( ground );

      const loader = new GLTFLoader();

      loader.load( 'models/gltf/Horse.glb', function ( glb ) {

        dummy = glb.scene.children[ 0 ];

        mesh = new THREE.InstancedMesh( dummy.geometry, dummy.material, 1024 );

        mesh.castShadow = true;

        for ( let x = 0, i = 0; x < 32; x ++ ) {

          for ( let y = 0; y < 32; y ++ ) {

            dummy.position.set( offset - 300 * x + 200 * Math.random(), 0, offset - 300 * y );

            dummy.updateMatrix();

            mesh.setMatrixAt( i, dummy.matrix );

            mesh.setColorAt( i, new THREE.Color( `hsl(${Math.random() * 360}, 50%, 66%)` ) );

            i ++;
    
          }

    
        }

        scene.add( mesh );

        mixer = new THREE.AnimationMixer( glb.scene );

        const action = mixer.clipAction( glb.animations[ 0 ] );

        action.play();
    
      } );

      //

      renderer = new THREE.WebGLRenderer( { antialias: true } );
      renderer.setPixelRatio( window.devicePixelRatio );
      renderer.setSize( window.innerWidth, window.innerHeight );
      document.body.appendChild( renderer.domElement );
      renderer.shadowMap.enabled = true;
      renderer.shadowMap.type = THREE.VSMShadowMap;
      //

      stats = new Stats();
      document.body.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() {

      requestAnimationFrame( animate );

      render();

      stats.update();

    }

    function render() {

      const time = clock.getElapsedTime();

      const r = 3000;
      camera.position.set( Math.sin( time / 10 ) * r, 1500 + 1000 * Math.cos( time / 5 ), Math.cos( time / 10 ) * r );
      camera.lookAt( 0, 0, 0 );

      if ( mesh ) {

        for ( let i = 0; i < 1024; i ++ ) {

          mixer.setTime( time + timeOffsets[ i ] );

          mesh.setMorphAt( i, dummy );

        }

        mesh.morphTexture.needsUpdate = true;

      }

      renderer.render( scene, camera );

    }
  }
})