import { Sphere } from '../math/Sphere.js';
import { Ray } from '../math/Ray.js';
import { Matrix4 } from '../math/Matrix4.js';
import { Object3D } from '../core/Object3D.js';
import { Vector3 } from '../math/Vector3.js';
import { PointsMaterial } from '../materials/PointsMaterial.js';
import { BufferGeometry } from '../core/BufferGeometry.js';

const _inverseMatrix = /*@__PURE__*/ new Matrix4();
const _ray = /*@__PURE__*/ new Ray();
const _sphere = /*@__PURE__*/ new Sphere();
const _position = /*@__PURE__*/ new Vector3();

class Points extends Object3D {
	constructor(geometry = new BufferGeometry(), material = new PointsMaterial()) {
		super();

		this.type = 'Points';

		this.geometry = geometry;
		this.material = material;

		this.updateMorphTargets();
	}

	copy(source) {
		super.copy(source);

		this.material = source.material;
		this.geometry = source.geometry;

		return this;
	}

	raycast(raycaster, intersects) {
		const geometry = this.geometry;
		const matrixWorld = this.matrixWorld;
		const threshold = raycaster.params.Points.threshold;
		const drawRange = geometry.drawRange;

		// Checking boundingSphere distance to ray

		if (geometry.boundingSphere === null) geometry.computeBoundingSphere();

		_sphere.copy(geometry.boundingSphere);
		_sphere.applyMatrix4(matrixWorld);
		_sphere.radius += threshold;

		if (raycaster.ray.intersectsSphere(_sphere) === false) return;

		//

		_inverseMatrix.copy(matrixWorld).invert();
		_ray.copy(raycaster.ray).applyMatrix4(_inverseMatrix);

		const localThreshold = threshold / ((this.scale.x + this.scale.y + this.scale.z) / 3);
		const localThresholdSq = localThreshold * localThreshold;

		if (geometry.isBufferGeometry) {
			const index = geometry.index;
			const attributes = geometry.attributes;
			const positionAttribute = attributes.position;

			if (index !== null) {
				const start = Math.max(0, drawRange.start);
				const end = Math.min(index.count, drawRange.start + drawRange.count);

				for (let i = start, il = end; i < il; i++) {
					const a = index.getX(i);

					_position.fromBufferAttribute(positionAttribute, a);

					testPoint(_position, a, localThresholdSq, matrixWorld, raycaster, intersects, this);
				}
			} else {
				const start = Math.max(0, drawRange.start);
				const end = Math.min(positionAttribute.count, drawRange.start + drawRange.count);

				for (let i = start, l = end; i < l; i++) {
					_position.fromBufferAttribute(positionAttribute, i);

					testPoint(_position, i, localThresholdSq, matrixWorld, raycaster, intersects, this);
				}
			}
		} else {
			console.error('THREE.Points.raycast() no longer supports THREE.Geometry. Use THREE.BufferGeometry instead.');
		}
	}

	updateMorphTargets() {
		const geometry = this.geometry;

		if (geometry.isBufferGeometry) {
			const morphAttributes = geometry.morphAttributes;
			const keys = Object.keys(morphAttributes);

			if (keys.length > 0) {
				const morphAttribute = morphAttributes[keys[0]];

				if (morphAttribute !== undefined) {
					this.morphTargetInfluences = [];
					this.morphTargetDictionary = {};

					for (let m = 0, ml = morphAttribute.length; m < ml; m++) {
						const name = morphAttribute[m].name || String(m);

						this.morphTargetInfluences.push(0);
						this.morphTargetDictionary[name] = m;
					}
				}
			}
		} else {
			const morphTargets = geometry.morphTargets;

			if (morphTargets !== undefined && morphTargets.length > 0) {
				console.error('THREE.Points.updateMorphTargets() does not support THREE.Geometry. Use THREE.BufferGeometry instead.');
			}
		}
	}
}

Points.prototype.isPoints = true;

function testPoint(point, index, localThresholdSq, matrixWorld, raycaster, intersects, object) {
	const rayPointDistanceSq = _ray.distanceSqToPoint(point);

	if (rayPointDistanceSq < localThresholdSq) {
		const intersectPoint = new Vector3();

		_ray.closestPointToPoint(point, intersectPoint);
		intersectPoint.applyMatrix4(matrixWorld);

		const distance = raycaster.ray.origin.distanceTo(intersectPoint);

		if (distance < raycaster.near || distance > raycaster.far) return;

		intersects.push({
			distance: distance,
			distanceToRay: Math.sqrt(rayPointDistanceSq),
			point: intersectPoint,
			index: index,
			face: null,
			object: object,
		});
	}
}

export { Points };