class Vector2 {
	constructor(x = 0, y = 0) {
		this.x = x;
		this.y = y;
	}

	get width() {
		return this.x;
	}

	set width(value) {
		this.x = value;
	}

	get height() {
		return this.y;
	}

	set height(value) {
		this.y = value;
	}

	set(x, y) {
		this.x = x;
		this.y = y;

		return this;
	}

	setScalar(scalar) {
		this.x = scalar;
		this.y = scalar;

		return this;
	}

	setX(x) {
		this.x = x;

		return this;
	}

	setY(y) {
		this.y = y;

		return this;
	}

	setComponent(index, value) {
		switch (index) {
			case 0:
				this.x = value;
				break;
			case 1:
				this.y = value;
				break;
			default:
				throw new Error('index is out of range: ' + index);
		}

		return this;
	}

	getComponent(index) {
		switch (index) {
			case 0:
				return this.x;
			case 1:
				return this.y;
			default:
				throw new Error('index is out of range: ' + index);
		}
	}

	clone() {
		return new this.constructor(this.x, this.y);
	}

	copy(v) {
		this.x = v.x;
		this.y = v.y;

		return this;
	}

	add(v, w) {
		if (w !== undefined) {
			console.warn('THREE.Vector2: .add() now only accepts one argument. Use .addVectors( a, b ) instead.');
			return this.addVectors(v, w);
		}

		this.x += v.x;
		this.y += v.y;

		return this;
	}

	addScalar(s) {
		this.x += s;
		this.y += s;

		return this;
	}

	addVectors(a, b) {
		this.x = a.x + b.x;
		this.y = a.y + b.y;

		return this;
	}

	addScaledVector(v, s) {
		this.x += v.x * s;
		this.y += v.y * s;

		return this;
	}

	sub(v, w) {
		if (w !== undefined) {
			console.warn('THREE.Vector2: .sub() now only accepts one argument. Use .subVectors( a, b ) instead.');
			return this.subVectors(v, w);
		}

		this.x -= v.x;
		this.y -= v.y;

		return this;
	}

	subScalar(s) {
		this.x -= s;
		this.y -= s;

		return this;
	}

	subVectors(a, b) {
		this.x = a.x - b.x;
		this.y = a.y - b.y;

		return this;
	}

	multiply(v) {
		this.x *= v.x;
		this.y *= v.y;

		return this;
	}

	multiplyScalar(scalar) {
		this.x *= scalar;
		this.y *= scalar;

		return this;
	}

	divide(v) {
		this.x /= v.x;
		this.y /= v.y;

		return this;
	}

	divideScalar(scalar) {
		return this.multiplyScalar(1 / scalar);
	}

	applyMatrix3(m) {
		const x = this.x,
			y = this.y;
		const e = m.elements;

		this.x = e[0] * x + e[3] * y + e[6];
		this.y = e[1] * x + e[4] * y + e[7];

		return this;
	}

	min(v) {
		this.x = Math.min(this.x, v.x);
		this.y = Math.min(this.y, v.y);

		return this;
	}

	max(v) {
		this.x = Math.max(this.x, v.x);
		this.y = Math.max(this.y, v.y);

		return this;
	}

	clamp(min, max) {
		// assumes min < max, componentwise

		this.x = Math.max(min.x, Math.min(max.x, this.x));
		this.y = Math.max(min.y, Math.min(max.y, this.y));

		return this;
	}

	clampScalar(minVal, maxVal) {
		this.x = Math.max(minVal, Math.min(maxVal, this.x));
		this.y = Math.max(minVal, Math.min(maxVal, this.y));

		return this;
	}

	clampLength(min, max) {
		const length = this.length();

		return this.divideScalar(length || 1).multiplyScalar(Math.max(min, Math.min(max, length)));
	}

	floor() {
		this.x = Math.floor(this.x);
		this.y = Math.floor(this.y);

		return this;
	}

	ceil() {
		this.x = Math.ceil(this.x);
		this.y = Math.ceil(this.y);

		return this;
	}

	round() {
		this.x = Math.round(this.x);
		this.y = Math.round(this.y);

		return this;
	}

	roundToZero() {
		this.x = this.x < 0 ? Math.ceil(this.x) : Math.floor(this.x);
		this.y = this.y < 0 ? Math.ceil(this.y) : Math.floor(this.y);

		return this;
	}

	negate() {
		this.x = -this.x;
		this.y = -this.y;

		return this;
	}

	dot(v) {
		return this.x * v.x + this.y * v.y;
	}

	cross(v) {
		return this.x * v.y - this.y * v.x;
	}

	lengthSq() {
		return this.x * this.x + this.y * this.y;
	}

	length() {
		return Math.sqrt(this.x * this.x + this.y * this.y);
	}

	manhattanLength() {
		return Math.abs(this.x) + Math.abs(this.y);
	}

	normalize() {
		return this.divideScalar(this.length() || 1);
	}

	angle() {
		// computes the angle in radians with respect to the positive x-axis

		const angle = Math.atan2(-this.y, -this.x) + Math.PI;

		return angle;
	}

	distanceTo(v) {
		return Math.sqrt(this.distanceToSquared(v));
	}

	distanceToSquared(v) {
		const dx = this.x - v.x,
			dy = this.y - v.y;
		return dx * dx + dy * dy;
	}

	manhattanDistanceTo(v) {
		return Math.abs(this.x - v.x) + Math.abs(this.y - v.y);
	}

	setLength(length) {
		return this.normalize().multiplyScalar(length);
	}

	lerp(v, alpha) {
		this.x += (v.x - this.x) * alpha;
		this.y += (v.y - this.y) * alpha;

		return this;
	}

	lerpVectors(v1, v2, alpha) {
		this.x = v1.x + (v2.x - v1.x) * alpha;
		this.y = v1.y + (v2.y - v1.y) * alpha;

		return this;
	}

	equals(v) {
		return v.x === this.x && v.y === this.y;
	}

	fromArray(array, offset = 0) {
		this.x = array[offset];
		this.y = array[offset + 1];

		return this;
	}

	toArray(array = [], offset = 0) {
		array[offset] = this.x;
		array[offset + 1] = this.y;

		return array;
	}

	fromBufferAttribute(attribute, index, offset) {
		if (offset !== undefined) {
			console.warn('THREE.Vector2: offset has been removed from .fromBufferAttribute().');
		}

		this.x = attribute.getX(index);
		this.y = attribute.getY(index);

		return this;
	}

	rotateAround(center, angle) {
		const c = Math.cos(angle),
			s = Math.sin(angle);

		const x = this.x - center.x;
		const y = this.y - center.y;

		this.x = x * c - y * s + center.x;
		this.y = x * s + y * c + center.y;

		return this;
	}

	random() {
		this.x = Math.random();
		this.y = Math.random();

		return this;
	}

	*[Symbol.iterator]() {
		yield this.x;
		yield this.y;
	}
}

Vector2.prototype.isVector2 = true;

export { Vector2 };