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import { Vector3 } from '../math/Vector3.js';
import { Color } from '../math/Color.js';
import { Object3D } from '../core/Object3D.js';
import { Mesh } from '../objects/Mesh.js';
import { MeshBasicMaterial } from '../materials/MeshBasicMaterial.js';
import { OctahedronGeometry } from '../geometries/OctahedronGeometry.js';
import { BufferAttribute } from '../core/BufferAttribute.js';

const _vector = /*@__PURE__*/ new Vector3();
const _color1 = /*@__PURE__*/ new Color();
const _color2 = /*@__PURE__*/ new Color();

/**
 * Creates a visual aid consisting of a spherical mesh for a
 * given {@link HemisphereLight}.
 *
 * ```js
 * const light = new THREE.HemisphereLight( 0xffffbb, 0x080820, 1 );
 * const helper = new THREE.HemisphereLightHelper( light, 5 );
 * scene.add( helper );
 * ```
 *
 * @augments Object3D
 */
class HemisphereLightHelper extends Object3D {

/**
	 * Constructs a new hemisphere light helper.
	 *
	 * @param {HemisphereLight} light - The light to be visualized.
	 * @param {number} [size=1] - The size of the mesh used to visualize the light.
	 * @param {number|Color|string} [color] - The helper's color. If not set, the helper will take
	 * the color of the light.
	 */
	constructor( light, size, color ) {

super();

/**
		 * The light being visualized.
		 *
		 * @type {HemisphereLight}
		 */
		this.light = light;

this.matrix = light.matrixWorld;
		this.matrixAutoUpdate = false;

/**
		 * The color parameter passed in the constructor.
		 * If not set, the helper will take the color of the light.
		 *
		 * @type {number|Color|string}
		 */
		this.color = color;

this.type = 'HemisphereLightHelper';

const geometry = new OctahedronGeometry( size );
		geometry.rotateY( Math.PI * 0.5 );

this.material = new MeshBasicMaterial( { wireframe: true, fog: false, toneMapped: false } );
		if ( this.color === undefined ) this.material.vertexColors = true;

const position = geometry.getAttribute( 'position' );
		const colors = new Float32Array( position.count * 3 );

geometry.setAttribute( 'color', new BufferAttribute( colors, 3 ) );

this.add( new Mesh( geometry, this.material ) );

this.update();

}

/**
	 * Frees the GPU-related resources allocated by this instance. Call this
	 * method whenever this instance is no longer used in your app.
	 */
	dispose() {

this.children[ 0 ].geometry.dispose();
		this.children[ 0 ].material.dispose();

}

/**
	 * Updates the helper to match the position and direction of the
	 * light being visualized.
	 */
	update() {

const mesh = this.children[ 0 ];

if ( this.color !== undefined ) {

this.material.color.set( this.color );

} else {

const colors = mesh.geometry.getAttribute( 'color' );

_color1.copy( this.light.color );
			_color2.copy( this.light.groundColor );

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

const color = ( i < ( l / 2 ) ) ? _color1 : _color2;

colors.setXYZ( i, color.r, color.g, color.b );

}

colors.needsUpdate = true;

}

this.light.updateWorldMatrix( true, false );

mesh.lookAt( _vector.setFromMatrixPosition( this.light.matrixWorld ).negate() );

}

export { HemisphereLightHelper };

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