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

import { GUI } from 'three/examples/jsm/libs/lil-gui.module.min.js';
import { OrbitControls } from 'three/examples/jsm/controls/OrbitControls.js';
import { OrbitControls0 } from 'three/examples/jsm/controls/OrbitControls0.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 mesh, renderer, scene, camera;

  let gui;

  const API = {
    offsetX: 0,
    offsetY: 0,
    repeatX: 0.25,
    repeatY: 0.25,
    rotation: Math.PI / 4, // positive is counterclockwise
    centerX: 0.5,
    centerY: 0.5
  };

  init();

  function init() {

    renderer = new THREE.WebGLRenderer();
    renderer.setPixelRatio( window.devicePixelRatio );
    renderer.setSize( window.innerWidth, window.innerHeight );
    document.body.appendChild( renderer.domElement );

    scene = new THREE.Scene();

    camera = new THREE.PerspectiveCamera( 40, window.innerWidth / window.innerHeight, 1, 1000 );
    camera.position.set( 10, 15, 25 );
    scene.add( camera );

    const controls = new (window.platform=="devtools"?OrbitControls:OrbitControls0)( camera, renderer.domElement );
    controls.addEventListener( 'change', render );
    controls.minDistance = 20;
    controls.maxDistance = 50;
    controls.maxPolarAngle = Math.PI / 2;

    const geometry = new THREE.BoxGeometry( 10, 10, 10 );

    new THREE.TextureLoader().load( 'textures/uv_grid_opengl.jpg', function ( texture ) {

      texture.wrapS = texture.wrapT = THREE.RepeatWrapping;
      texture.anisotropy = renderer.capabilities.getMaxAnisotropy();
      texture.colorSpace = THREE.SRGBColorSpace;

      //texture.matrixAutoUpdate = false; // default true; set to false to update texture.matrix manually

      const material = new THREE.MeshBasicMaterial( { map: texture } );

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

      updateUvTransform();

      initGui();

      render();

    } );

    window.addEventListener( 'resize', onWindowResize );

  }

  function render() {

    renderer.render( scene, camera );

  }

  function onWindowResize() {

    camera.aspect = window.innerWidth / window.innerHeight;

    camera.updateProjectionMatrix();

    renderer.setSize( window.innerWidth, window.innerHeight );

    render();

  }

  function updateUvTransform() {

    const texture = mesh.material.map;

    if ( texture.matrixAutoUpdate === true ) {

      texture.offset.set( API.offsetX, API.offsetY );
      texture.repeat.set( API.repeatX, API.repeatY );
      texture.center.set( API.centerX, API.centerY );
      texture.rotation = API.rotation; // rotation is around center

    } else {

      // setting the matrix uv transform directly
      //texture.matrix.setUvTransform( API.offsetX, API.offsetY, API.repeatX, API.repeatY, API.rotation, API.centerX, API.centerY );

      // another way...
      texture.matrix
          .identity()
          .translate( - API.centerX, - API.centerY )
          .rotate( API.rotation )					// I don't understand how rotation can preceed scale, but it seems to be required...
          .scale( API.repeatX, API.repeatY )
          .translate( API.centerX, API.centerY )
          .translate( API.offsetX, API.offsetY );

    }

    render();

  }

  function initGui() {

    gui = new GUI();

    gui.add( API, 'offsetX', 0.0, 1.0 ).name( 'offset.x' ).onChange( updateUvTransform );
    gui.add( API, 'offsetY', 0.0, 1.0 ).name( 'offset.y' ).onChange( updateUvTransform );
    gui.add( API, 'repeatX', 0.25, 2.0 ).name( 'repeat.x' ).onChange( updateUvTransform );
    gui.add( API, 'repeatY', 0.25, 2.0 ).name( 'repeat.y' ).onChange( updateUvTransform );
    gui.add( API, 'rotation', - 2.0, 2.0 ).name( 'rotation' ).onChange( updateUvTransform );
    gui.add( API, 'centerX', 0.0, 1.0 ).name( 'center.x' ).onChange( updateUvTransform );
    gui.add( API, 'centerY', 0.0, 1.0 ).name( 'center.y' ).onChange( updateUvTransform );

  }

  }
})