class Vector4 {
	constructor(x = 0, y = 0, z = 0, w = 1) {
		this.x = x;
		this.y = y;
		this.z = z;
		this.w = w;
	}

	get width() {
		return this.z;
	}

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

	get height() {
		return this.w;
	}

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

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

		return this;
	}

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

		return this;
	}

	setX(x) {
		this.x = x;

		return this;
	}

	setY(y) {
		this.y = y;

		return this;
	}

	setZ(z) {
		this.z = z;

		return this;
	}

	setW(w) {
		this.w = w;

		return this;
	}

	setComponent(index, value) {
		switch (index) {
			case 0:
				this.x = value;
				break;
			case 1:
				this.y = value;
				break;
			case 2:
				this.z = value;
				break;
			case 3:
				this.w = 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;
			case 2:
				return this.z;
			case 3:
				return this.w;
			default:
				throw new Error('index is out of range: ' + index);
		}
	}

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

	copy(v) {
		this.x = v.x;
		this.y = v.y;
		this.z = v.z;
		this.w = v.w !== undefined ? v.w : 1;

		return this;
	}

	add(v, w) {
		if (w !== undefined) {
			console.warn('THREE.Vector4: .add() now only accepts one argument. Use .addVectors( a, b ) instead.');
			return this.addVectors(v, w);
		}

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

		return this;
	}

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

		return this;
	}

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

		return this;
	}

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

		return this;
	}

	sub(v, w) {
		if (w !== undefined) {
			console.warn('THREE.Vector4: .sub() now only accepts one argument. Use .subVectors( a, b ) instead.');
			return this.subVectors(v, w);
		}

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

		return this;
	}

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

		return this;
	}

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

		return this;
	}

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

		return this;
	}

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

		return this;
	}

	applyMatrix4(m) {
		const x = this.x,
			y = this.y,
			z = this.z,
			w = this.w;
		const e = m.elements;

		this.x = e[0] * x + e[4] * y + e[8] * z + e[12] * w;
		this.y = e[1] * x + e[5] * y + e[9] * z + e[13] * w;
		this.z = e[2] * x + e[6] * y + e[10] * z + e[14] * w;
		this.w = e[3] * x + e[7] * y + e[11] * z + e[15] * w;

		return this;
	}

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

	setAxisAngleFromQuaternion(q) {
		// http://www.euclideanspace.com/maths/geometry/rotations/conversions/quaternionToAngle/index.htm

		// q is assumed to be normalized

		this.w = 2 * Math.acos(q.w);

		const s = Math.sqrt(1 - q.w * q.w);

		if (s < 0.0001) {
			this.x = 1;
			this.y = 0;
			this.z = 0;
		} else {
			this.x = q.x / s;
			this.y = q.y / s;
			this.z = q.z / s;
		}

		return this;
	}

	setAxisAngleFromRotationMatrix(m) {
		// http://www.euclideanspace.com/maths/geometry/rotations/conversions/matrixToAngle/index.htm

		// assumes the upper 3x3 of m is a pure rotation matrix (i.e, unscaled)

		let angle, x, y, z; // variables for result
		const epsilon = 0.01, // margin to allow for rounding errors
			epsilon2 = 0.1, // margin to distinguish between 0 and 180 degrees
			te = m.elements,
			m11 = te[0],
			m12 = te[4],
			m13 = te[8],
			m21 = te[1],
			m22 = te[5],
			m23 = te[9],
			m31 = te[2],
			m32 = te[6],
			m33 = te[10];

		if (Math.abs(m12 - m21) < epsilon && Math.abs(m13 - m31) < epsilon && Math.abs(m23 - m32) < epsilon) {
			// singularity found
			// first check for identity matrix which must have +1 for all terms
			// in leading diagonal and zero in other terms

			if (
				Math.abs(m12 + m21) < epsilon2 &&
				Math.abs(m13 + m31) < epsilon2 &&
				Math.abs(m23 + m32) < epsilon2 &&
				Math.abs(m11 + m22 + m33 - 3) < epsilon2
			) {
				// this singularity is identity matrix so angle = 0

				this.set(1, 0, 0, 0);

				return this; // zero angle, arbitrary axis
			}

			// otherwise this singularity is angle = 180

			angle = Math.PI;

			const xx = (m11 + 1) / 2;
			const yy = (m22 + 1) / 2;
			const zz = (m33 + 1) / 2;
			const xy = (m12 + m21) / 4;
			const xz = (m13 + m31) / 4;
			const yz = (m23 + m32) / 4;

			if (xx > yy && xx > zz) {
				// m11 is the largest diagonal term

				if (xx < epsilon) {
					x = 0;
					y = 0.707106781;
					z = 0.707106781;
				} else {
					x = Math.sqrt(xx);
					y = xy / x;
					z = xz / x;
				}
			} else if (yy > zz) {
				// m22 is the largest diagonal term

				if (yy < epsilon) {
					x = 0.707106781;
					y = 0;
					z = 0.707106781;
				} else {
					y = Math.sqrt(yy);
					x = xy / y;
					z = yz / y;
				}
			} else {
				// m33 is the largest diagonal term so base result on this

				if (zz < epsilon) {
					x = 0.707106781;
					y = 0.707106781;
					z = 0;
				} else {
					z = Math.sqrt(zz);
					x = xz / z;
					y = yz / z;
				}
			}

			this.set(x, y, z, angle);

			return this; // return 180 deg rotation
		}

		// as we have reached here there are no singularities so we can handle normally

		let s = Math.sqrt((m32 - m23) * (m32 - m23) + (m13 - m31) * (m13 - m31) + (m21 - m12) * (m21 - m12)); // used to normalize

		if (Math.abs(s) < 0.001) s = 1;

		// prevent divide by zero, should not happen if matrix is orthogonal and should be
		// caught by singularity test above, but I've left it in just in case

		this.x = (m32 - m23) / s;
		this.y = (m13 - m31) / s;
		this.z = (m21 - m12) / s;
		this.w = Math.acos((m11 + m22 + m33 - 1) / 2);

		return this;
	}

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

		return this;
	}

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

		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));
		this.z = Math.max(min.z, Math.min(max.z, this.z));
		this.w = Math.max(min.w, Math.min(max.w, this.w));

		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));
		this.z = Math.max(minVal, Math.min(maxVal, this.z));
		this.w = Math.max(minVal, Math.min(maxVal, this.w));

		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);
		this.z = Math.floor(this.z);
		this.w = Math.floor(this.w);

		return this;
	}

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

		return this;
	}

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

		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);
		this.z = this.z < 0 ? Math.ceil(this.z) : Math.floor(this.z);
		this.w = this.w < 0 ? Math.ceil(this.w) : Math.floor(this.w);

		return this;
	}

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

		return this;
	}

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

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

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

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

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

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

	lerp(v, alpha) {
		this.x += (v.x - this.x) * alpha;
		this.y += (v.y - this.y) * alpha;
		this.z += (v.z - this.z) * alpha;
		this.w += (v.w - this.w) * 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;
		this.z = v1.z + (v2.z - v1.z) * alpha;
		this.w = v1.w + (v2.w - v1.w) * alpha;

		return this;
	}

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

	fromArray(array, offset = 0) {
		this.x = array[offset];
		this.y = array[offset + 1];
		this.z = array[offset + 2];
		this.w = array[offset + 3];

		return this;
	}

	toArray(array = [], offset = 0) {
		array[offset] = this.x;
		array[offset + 1] = this.y;
		array[offset + 2] = this.z;
		array[offset + 3] = this.w;

		return array;
	}

	fromBufferAttribute(attribute, index, offset) {
		if (offset !== undefined) {
			console.warn('THREE.Vector4: offset has been removed from .fromBufferAttribute().');
		}

		this.x = attribute.getX(index);
		this.y = attribute.getY(index);
		this.z = attribute.getZ(index);
		this.w = attribute.getW(index);

		return this;
	}

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

		return this;
	}

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

Vector4.prototype.isVector4 = true;

export { Vector4 };