import mat3 from './mat3';
import mat4 from './mat4';
import vec3 from './vec3';
import { epsilon } from './constants';
export default class quat {
    constructor(values) {
        this.values = new Float32Array(4);
        if (values !== undefined) {
            this.xyzw = values;
        }
    }
    get x() {
        return this.values[0];
    }
    get y() {
        return this.values[1];
    }
    get z() {
        return this.values[2];
    }
    get w() {
        return this.values[3];
    }
    get xy() {
        return [this.values[0], this.values[1]];
    }
    get xyz() {
        return [this.values[0], this.values[1], this.values[2]];
    }
    get xyzw() {
        return [this.values[0], this.values[1], this.values[2], this.values[3]];
    }
    set x(value) {
        this.values[0] = value;
    }
    set y(value) {
        this.values[1] = value;
    }
    set z(value) {
        this.values[2] = value;
    }
    set w(value) {
        this.values[3] = value;
    }
    set xy(values) {
        this.values[0] = values[0];
        this.values[1] = values[1];
    }
    set xyz(values) {
        this.values[0] = values[0];
        this.values[1] = values[1];
        this.values[2] = values[2];
    }
    set xyzw(values) {
        this.values[0] = values[0];
        this.values[1] = values[1];
        this.values[2] = values[2];
        this.values[3] = values[3];
    }
    at(index) {
        return this.values[index];
    }
    reset() {
        for (let i = 0; i < 4; i++) {
            this.values[i] = 0;
        }
    }
    copy(dest) {
        if (!dest) {
            dest = new quat();
        }
        for (let i = 0; i < 4; i++) {
            dest.values[i] = this.values[i];
        }
        return dest;
    }
    roll() {
        const x = this.x;
        const y = this.y;
        const z = this.z;
        const w = this.w;
        return Math.atan2(2.0 * (x * y + w * z), w * w + x * x - y * y - z * z);
    }
    pitch() {
        const x = this.x;
        const y = this.y;
        const z = this.z;
        const w = this.w;
        return Math.atan2(2.0 * (y * z + w * x), w * w - x * x - y * y + z * z);
    }
    yaw() {
        return Math.asin(2.0 * (this.x * this.z - this.w * this.y));
    }
    equals(vector, threshold = epsilon) {
        for (let i = 0; i < 4; i++) {
            if (Math.abs(this.values[i] - vector.at(i)) > threshold) {
                return false;
            }
        }
        return true;
    }
    setIdentity() {
        this.x = 0;
        this.y = 0;
        this.z = 0;
        this.w = 1;
        return this;
    }
    calculateW() {
        const x = this.x;
        const y = this.y;
        const z = this.z;
        this.w = -Math.sqrt(Math.abs(1.0 - x * x - y * y - z * z));
        return this;
    }
    inverse() {
        const dot = quat.dot(this, this);
        if (!dot) {
            this.xyzw = [0, 0, 0, 0];
            return this;
        }
        const invDot = dot ? 1.0 / dot : 0;
        this.x *= -invDot;
        this.y *= -invDot;
        this.z *= -invDot;
        this.w *= invDot;
        return this;
    }
    conjugate() {
        this.values[0] *= -1;
        this.values[1] *= -1;
        this.values[2] *= -1;
        return this;
    }
    length() {
        const x = this.x;
        const y = this.y;
        const z = this.z;
        const w = this.w;
        return Math.sqrt(x * x + y * y + z * z + w * w);
    }
    normalize(dest) {
        if (!dest) {
            dest = this;
        }
        const x = this.x;
        const y = this.y;
        const z = this.z;
        const w = this.w;
        let length = Math.sqrt(x * x + y * y + z * z + w * w);
        if (!length) {
            dest.x = 0;
            dest.y = 0;
            dest.z = 0;
            dest.w = 0;
            return dest;
        }
        length = 1 / length;
        dest.x = x * length;
        dest.y = y * length;
        dest.z = z * length;
        dest.w = w * length;
        return dest;
    }
    add(other) {
        for (let i = 0; i < 4; i++) {
            this.values[i] += other.at(i);
        }
        return this;
    }
    multiply(other) {
        const q1x = this.values[0];
        const q1y = this.values[1];
        const q1z = this.values[2];
        const q1w = this.values[3];
        const q2x = other.x;
        const q2y = other.y;
        const q2z = other.z;
        const q2w = other.w;
        this.x = q1x * q2w + q1w * q2x + q1y * q2z - q1z * q2y;
        this.y = q1y * q2w + q1w * q2y + q1z * q2x - q1x * q2z;
        this.z = q1z * q2w + q1w * q2z + q1x * q2y - q1y * q2x;
        this.w = q1w * q2w - q1x * q2x - q1y * q2y - q1z * q2z;
        return this;
    }
    multiplyVec3(vector, dest) {
        if (!dest) {
            dest = new vec3();
        }
        const x = vector.x;
        const y = vector.y;
        const z = vector.z;
        const qx = this.x;
        const qy = this.y;
        const qz = this.z;
        const qw = this.w;
        const ix = qw * x + qy * z - qz * y;
        const iy = qw * y + qz * x - qx * z;
        const iz = qw * z + qx * y - qy * x;
        const iw = -qx * x - qy * y - qz * z;
        dest.x = ix * qw + iw * -qx + iy * -qz - iz * -qy;
        dest.y = iy * qw + iw * -qy + iz * -qx - ix * -qz;
        dest.z = iz * qw + iw * -qz + ix * -qy - iy * -qx;
        return dest;
    }
    toMat3(dest) {
        if (!dest) {
            dest = new mat3();
        }
        const x = this.x;
        const y = this.y;
        const z = this.z;
        const w = this.w;
        const x2 = x + x;
        const y2 = y + y;
        const z2 = z + z;
        const xx = x * x2;
        const xy = x * y2;
        const xz = x * z2;
        const yy = y * y2;
        const yz = y * z2;
        const zz = z * z2;
        const wx = w * x2;
        const wy = w * y2;
        const wz = w * z2;
        dest.init([
            1 - (yy + zz),
            xy + wz,
            xz - wy,
            xy - wz,
            1 - (xx + zz),
            yz + wx,
            xz + wy,
            yz - wx,
            1 - (xx + yy)
        ]);
        return dest;
    }
    toMat4(dest) {
        if (!dest) {
            dest = new mat4();
        }
        const x = this.x;
        const y = this.y;
        const z = this.z;
        const w = this.w;
        const x2 = x + x;
        const y2 = y + y;
        const z2 = z + z;
        const xx = x * x2;
        const xy = x * y2;
        const xz = x * z2;
        const yy = y * y2;
        const yz = y * z2;
        const zz = z * z2;
        const wx = w * x2;
        const wy = w * y2;
        const wz = w * z2;
        dest.init([
            1 - (yy + zz),
            xy + wz,
            xz - wy,
            0,
            xy - wz,
            1 - (xx + zz),
            yz + wx,
            0,
            xz + wy,
            yz - wx,
            1 - (xx + yy),
            0,
            0,
            0,
            0,
            1
        ]);
        return dest;
    }
    static dot(q1, q2) {
        return q1.x * q2.x + q1.y * q2.y + q1.z * q2.z + q1.w * q2.w;
    }
    static sum(q1, q2, dest) {
        if (!dest) {
            dest = new quat();
        }
        dest.x = q1.x + q2.x;
        dest.y = q1.y + q2.y;
        dest.z = q1.z + q2.z;
        dest.w = q1.w + q2.w;
        return dest;
    }
    static product(q1, q2, dest) {
        if (!dest) {
            dest = new quat();
        }
        const q1x = q1.x;
        const q1y = q1.y;
        const q1z = q1.z;
        const q1w = q1.w;
        const q2x = q2.x;
        const q2y = q2.y;
        const q2z = q2.z;
        const q2w = q2.w;
        dest.x = q1x * q2w + q1w * q2x + q1y * q2z - q1z * q2y;
        dest.y = q1y * q2w + q1w * q2y + q1z * q2x - q1x * q2z;
        dest.z = q1z * q2w + q1w * q2z + q1x * q2y - q1y * q2x;
        dest.w = q1w * q2w - q1x * q2x - q1y * q2y - q1z * q2z;
        return dest;
    }
    static cross(q1, q2, dest) {
        if (!dest) {
            dest = new quat();
        }
        const q1x = q1.x;
        const q1y = q1.y;
        const q1z = q1.z;
        const q1w = q1.w;
        const q2x = q2.x;
        const q2y = q2.y;
        const q2z = q2.z;
        const q2w = q2.w;
        dest.x = q1w * q2z + q1z * q2w + q1x * q2y - q1y * q2x;
        dest.y = q1w * q2w - q1x * q2x - q1y * q2y - q1z * q2z;
        dest.z = q1w * q2x + q1x * q2w + q1y * q2z - q1z * q2y;
        dest.w = q1w * q2y + q1y * q2w + q1z * q2x - q1x * q2z;
        return dest;
    }
    static shortMix(q1, q2, time, dest) {
        if (!dest) {
            dest = new quat();
        }
        if (time <= 0.0) {
            dest.xyzw = q1.xyzw;
            return dest;
        }
        else if (time >= 1.0) {
            dest.xyzw = q2.xyzw;
            return dest;
        }
        let cos = quat.dot(q1, q2);
        const q2a = q2.copy();
        if (cos < 0.0) {
            q2a.inverse();
            cos = -cos;
        }
        let k0;
        let k1;
        if (cos > 0.9999) {
            k0 = 1 - time;
            k1 = 0 + time;
        }
        else {
            const sin = Math.sqrt(1 - cos * cos);
            const angle = Math.atan2(sin, cos);
            const oneOverSin = 1 / sin;
            k0 = Math.sin((1 - time) * angle) * oneOverSin;
            k1 = Math.sin((0 + time) * angle) * oneOverSin;
        }
        dest.x = k0 * q1.x + k1 * q2a.x;
        dest.y = k0 * q1.y + k1 * q2a.y;
        dest.z = k0 * q1.z + k1 * q2a.z;
        dest.w = k0 * q1.w + k1 * q2a.w;
        return dest;
    }
    static mix(q1, q2, time, dest) {
        if (!dest) {
            dest = new quat();
        }
        const cosHalfTheta = q1.x * q2.x + q1.y * q2.y + q1.z * q2.z + q1.w * q2.w;
        if (Math.abs(cosHalfTheta) >= 1.0) {
            dest.xyzw = q1.xyzw;
            return dest;
        }
        const halfTheta = Math.acos(cosHalfTheta);
        const sinHalfTheta = Math.sqrt(1.0 - cosHalfTheta * cosHalfTheta);
        if (Math.abs(sinHalfTheta) < 0.001) {
            dest.x = q1.x * 0.5 + q2.x * 0.5;
            dest.y = q1.y * 0.5 + q2.y * 0.5;
            dest.z = q1.z * 0.5 + q2.z * 0.5;
            dest.w = q1.w * 0.5 + q2.w * 0.5;
            return dest;
        }
        const ratioA = Math.sin((1 - time) * halfTheta) / sinHalfTheta;
        const ratioB = Math.sin(time * halfTheta) / sinHalfTheta;
        dest.x = q1.x * ratioA + q2.x * ratioB;
        dest.y = q1.y * ratioA + q2.y * ratioB;
        dest.z = q1.z * ratioA + q2.z * ratioB;
        dest.w = q1.w * ratioA + q2.w * ratioB;
        return dest;
    }
    static fromAxisAngle(axis, angle, dest) {
        if (!dest) {
            dest = new quat();
        }
        angle *= 0.5;
        const sin = Math.sin(angle);
        dest.x = axis.x * sin;
        dest.y = axis.y * sin;
        dest.z = axis.z * sin;
        dest.w = Math.cos(angle);
        return dest;
    }
}
quat.identity = new quat().setIdentity();