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

  import { PointerLockControls } from 'three/examples/jsm/controls/PointerLockControls.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, controls;

			const objects = [];

			let raycaster;

			let moveForward = false;
			let moveBackward = false;
			let moveLeft = false;
			let moveRight = false;
			let canJump = false;

			let prevTime = performance.now();
			const velocity = new THREE.Vector3();
			const direction = new THREE.Vector3();
			const vertex = new THREE.Vector3();
			const color = new THREE.Color();

			init();
			animate();

			function init() {

				camera = new THREE.PerspectiveCamera( 75, window.innerWidth / window.innerHeight, 1, 1000 );
				camera.position.y = 10;

				scene = new THREE.Scene();
				scene.background = new THREE.Color( 0xffffff );
				scene.fog = new THREE.Fog( 0xffffff, 0, 750 );

				const light = new THREE.HemisphereLight( 0xeeeeff, 0x777788, 2.5 );
				light.position.set( 0.5, 1, 0.75 );
				scene.add( light );

				controls = new PointerLockControls( camera, document.body );

				const blocker = document.getElementById( 'blocker' );
				const instructions = document.getElementById( 'instructions' );

				instructions.addEventListener( 'click', function () {

					controls.lock();

				} );

				controls.addEventListener( 'lock', function () {

					instructions.style.display = 'none';
					blocker.style.display = 'none';

				} );

				controls.addEventListener( 'unlock', function () {

					blocker.style.display = 'block';
					instructions.style.display = '';

				} );

				scene.add( controls.getObject() );

				const onKeyDown = function ( event ) {

					switch ( event.code ) {

						case 'ArrowUp':
						case 'KeyW':
							moveForward = true;
							break;

						case 'ArrowLeft':
						case 'KeyA':
							moveLeft = true;
							break;

						case 'ArrowDown':
						case 'KeyS':
							moveBackward = true;
							break;

						case 'ArrowRight':
						case 'KeyD':
							moveRight = true;
							break;

						case 'Space':
							if ( canJump === true ) velocity.y += 350;
							canJump = false;
							break;

					}

				};

				const onKeyUp = function ( event ) {

					switch ( event.code ) {

						case 'ArrowUp':
						case 'KeyW':
							moveForward = false;
							break;

						case 'ArrowLeft':
						case 'KeyA':
							moveLeft = false;
							break;

						case 'ArrowDown':
						case 'KeyS':
							moveBackward = false;
							break;

						case 'ArrowRight':
						case 'KeyD':
							moveRight = false;
							break;

					}

				};

				document.addEventListener( 'keydown', onKeyDown );
				document.addEventListener( 'keyup', onKeyUp );

				raycaster = new THREE.Raycaster( new THREE.Vector3(), new THREE.Vector3( 0, - 1, 0 ), 0, 10 );

				// floor

				let floorGeometry = new THREE.PlaneGeometry( 2000, 2000, 100, 100 );
				floorGeometry.rotateX( - Math.PI / 2 );

				// vertex displacement

				let position = floorGeometry.attributes.position;

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

					vertex.fromBufferAttribute( position, i );

					vertex.x += Math.random() * 20 - 10;
					vertex.y += Math.random() * 2;
					vertex.z += Math.random() * 20 - 10;

					position.setXYZ( i, vertex.x, vertex.y, vertex.z );

				}

				floorGeometry = floorGeometry.toNonIndexed(); // ensure each face has unique vertices

				position = floorGeometry.attributes.position;
				const colorsFloor = [];

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

					color.setHSL( Math.random() * 0.3 + 0.5, 0.75, Math.random() * 0.25 + 0.75, THREE.SRGBColorSpace );
					colorsFloor.push( color.r, color.g, color.b );

				}

				floorGeometry.setAttribute( 'color', new THREE.Float32BufferAttribute( colorsFloor, 3 ) );

				const floorMaterial = new THREE.MeshBasicMaterial( { vertexColors: true } );

				const floor = new THREE.Mesh( floorGeometry, floorMaterial );
				scene.add( floor );

				// objects

				const boxGeometry = new THREE.BoxGeometry( 20, 20, 20 ).toNonIndexed();

				position = boxGeometry.attributes.position;
				const colorsBox = [];

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

					color.setHSL( Math.random() * 0.3 + 0.5, 0.75, Math.random() * 0.25 + 0.75, THREE.SRGBColorSpace );
					colorsBox.push( color.r, color.g, color.b );

				}

				boxGeometry.setAttribute( 'color', new THREE.Float32BufferAttribute( colorsBox, 3 ) );

				for ( let i = 0; i < 500; i ++ ) {

					const boxMaterial = new THREE.MeshPhongMaterial( { specular: 0xffffff, flatShading: true, vertexColors: true } );
					boxMaterial.color.setHSL( Math.random() * 0.2 + 0.5, 0.75, Math.random() * 0.25 + 0.75, THREE.SRGBColorSpace );

					const box = new THREE.Mesh( boxGeometry, boxMaterial );
					box.position.x = Math.floor( Math.random() * 20 - 10 ) * 20;
					box.position.y = Math.floor( Math.random() * 20 ) * 20 + 10;
					box.position.z = Math.floor( Math.random() * 20 - 10 ) * 20;

					scene.add( box );
					objects.push( box );

				}

				//

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

				//

				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 );

				const time = performance.now();

				if ( controls.isLocked === true ) {

					raycaster.ray.origin.copy( controls.getObject().position );
					raycaster.ray.origin.y -= 10;

					const intersections = raycaster.intersectObjects( objects, false );

					const onObject = intersections.length > 0;

					const delta = ( time - prevTime ) / 1000;

					velocity.x -= velocity.x * 10.0 * delta;
					velocity.z -= velocity.z * 10.0 * delta;

					velocity.y -= 9.8 * 100.0 * delta; // 100.0 = mass

					direction.z = Number( moveForward ) - Number( moveBackward );
					direction.x = Number( moveRight ) - Number( moveLeft );
					direction.normalize(); // this ensures consistent movements in all directions

					if ( moveForward || moveBackward ) velocity.z -= direction.z * 400.0 * delta;
					if ( moveLeft || moveRight ) velocity.x -= direction.x * 400.0 * delta;

					if ( onObject === true ) {

						velocity.y = Math.max( 0, velocity.y );
						canJump = true;

					}

					controls.moveRight( - velocity.x * delta );
					controls.moveForward( - velocity.z * delta );

					controls.getObject().position.y += ( velocity.y * delta ); // new behavior

					if ( controls.getObject().position.y < 10 ) {

						velocity.y = 0;
						controls.getObject().position.y = 10;

						canJump = true;

					}

				}

				prevTime = time;

				renderer.render( scene, camera );

			}
  }
})