import { Vector3 } from './Vector3.js';
import * as MathUtils from './MathUtils.js';

const _startP = /*@__PURE__*/ new Vector3();
const _startEnd = /*@__PURE__*/ new Vector3();

class Line3 {
	constructor(start = new Vector3(), end = new Vector3()) {
		this.start = start;
		this.end = end;
	}

	set(start, end) {
		this.start.copy(start);
		this.end.copy(end);

		return this;
	}

	copy(line) {
		this.start.copy(line.start);
		this.end.copy(line.end);

		return this;
	}

	getCenter(target) {
		return target.addVectors(this.start, this.end).multiplyScalar(0.5);
	}

	delta(target) {
		return target.subVectors(this.end, this.start);
	}

	distanceSq() {
		return this.start.distanceToSquared(this.end);
	}

	distance() {
		return this.start.distanceTo(this.end);
	}

	at(t, target) {
		return this.delta(target).multiplyScalar(t).add(this.start);
	}

	closestPointToPointParameter(point, clampToLine) {
		_startP.subVectors(point, this.start);
		_startEnd.subVectors(this.end, this.start);

		const startEnd2 = _startEnd.dot(_startEnd);
		const startEnd_startP = _startEnd.dot(_startP);

		let t = startEnd_startP / startEnd2;

		if (clampToLine) {
			t = MathUtils.clamp(t, 0, 1);
		}

		return t;
	}

	closestPointToPoint(point, clampToLine, target) {
		const t = this.closestPointToPointParameter(point, clampToLine);

		return this.delta(target).multiplyScalar(t).add(this.start);
	}

	applyMatrix4(matrix) {
		this.start.applyMatrix4(matrix);
		this.end.applyMatrix4(matrix);

		return this;
	}

	equals(line) {
		return line.start.equals(this.start) && line.end.equals(this.end);
	}

	clone() {
		return new this.constructor().copy(this);
	}
}

export { Line3 };