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/*
Copyright (c) 2003-2006 Gino van den Bergen / Erwin Coumans  http://continuousphysics.com/Bullet/

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3. This notice may not be removed or altered from any source distribution.
*/



#ifndef TF2__LINEARMATH__QUATERNION_HPP_
#define TF2__LINEARMATH__QUATERNION_HPP_


#include "Vector3.hpp"
#include "QuadWord.hpp"
#include "tf2/visibility_control.h"

namespace tf2
{

class Quaternion : public QuadWord {
public:
        TF2_PUBLIC
    Quaternion() {}

    //      template <typename tf2Scalar>
    //      explicit Quaternion(const tf2Scalar *v) : Tuple4<tf2Scalar>(v) {}
        TF2_PUBLIC
    Quaternion(const tf2Scalar& x, const tf2Scalar& y, const tf2Scalar& z, const tf2Scalar& w)
        : QuadWord(x, y, z, w)
    {}
        TF2_PUBLIC
    Quaternion(const Vector3& axis, const tf2Scalar& angle)
    {
        setRotation(axis, angle);
    }
        TF2_PUBLIC
    void setRotation(const Vector3& axis, const tf2Scalar& angle)
    {
        tf2Scalar d = axis.length();
        tf2Assert(d != tf2Scalar(0.0));
        tf2Scalar s = tf2Sin(angle * tf2Scalar(0.5)) / d;
        setValue(axis.x() * s, axis.y() * s, axis.z() * s,
            tf2Cos(angle * tf2Scalar(0.5)));
    }
        TF2_PUBLIC
    void setEuler(const tf2Scalar& yaw, const tf2Scalar& pitch, const tf2Scalar& roll)
    {
        tf2Scalar halfYaw = tf2Scalar(yaw) * tf2Scalar(0.5);
        tf2Scalar halfPitch = tf2Scalar(pitch) * tf2Scalar(0.5);
        tf2Scalar halfRoll = tf2Scalar(roll) * tf2Scalar(0.5);
        tf2Scalar cosYaw = tf2Cos(halfYaw);
        tf2Scalar sinYaw = tf2Sin(halfYaw);
        tf2Scalar cosPitch = tf2Cos(halfPitch);
        tf2Scalar sinPitch = tf2Sin(halfPitch);
        tf2Scalar cosRoll = tf2Cos(halfRoll);
        tf2Scalar sinRoll = tf2Sin(halfRoll);
        setValue(cosRoll * sinPitch * cosYaw + sinRoll * cosPitch * sinYaw,
            cosRoll * cosPitch * sinYaw - sinRoll * sinPitch * cosYaw,
            sinRoll * cosPitch * cosYaw - cosRoll * sinPitch * sinYaw,
            cosRoll * cosPitch * cosYaw + sinRoll * sinPitch * sinYaw);
    }
        TF2_PUBLIC
  void setRPY(const tf2Scalar& roll, const tf2Scalar& pitch, const tf2Scalar& yaw)
    {
        tf2Scalar halfYaw = tf2Scalar(yaw) * tf2Scalar(0.5);
        tf2Scalar halfPitch = tf2Scalar(pitch) * tf2Scalar(0.5);
        tf2Scalar halfRoll = tf2Scalar(roll) * tf2Scalar(0.5);
        tf2Scalar cosYaw = tf2Cos(halfYaw);
        tf2Scalar sinYaw = tf2Sin(halfYaw);
        tf2Scalar cosPitch = tf2Cos(halfPitch);
        tf2Scalar sinPitch = tf2Sin(halfPitch);
        tf2Scalar cosRoll = tf2Cos(halfRoll);
        tf2Scalar sinRoll = tf2Sin(halfRoll);
        setValue(sinRoll * cosPitch * cosYaw - cosRoll * sinPitch * sinYaw, //x
                         cosRoll * sinPitch * cosYaw + sinRoll * cosPitch * sinYaw, //y
                         cosRoll * cosPitch * sinYaw - sinRoll * sinPitch * cosYaw, //z
                         cosRoll * cosPitch * cosYaw + sinRoll * sinPitch * sinYaw); //formerly yzx
    }
    TF2SIMD_FORCE_INLINE    Quaternion& operator+=(const Quaternion& q)
    {
        m_floats[0] += q.x(); m_floats[1] += q.y(); m_floats[2] += q.z(); m_floats[3] += q.m_floats[3];
        return *this;
    }

        TF2_PUBLIC
    Quaternion& operator-=(const Quaternion& q)
    {
        m_floats[0] -= q.x(); m_floats[1] -= q.y(); m_floats[2] -= q.z(); m_floats[3] -= q.m_floats[3];
        return *this;
    }

        TF2_PUBLIC
    Quaternion& operator*=(const tf2Scalar& s)
    {
        m_floats[0] *= s; m_floats[1] *= s; m_floats[2] *= s; m_floats[3] *= s;
        return *this;
    }

        TF2_PUBLIC
    Quaternion& operator*=(const Quaternion& q)
    {
        setValue(m_floats[3] * q.x() + m_floats[0] * q.m_floats[3] + m_floats[1] * q.z() - m_floats[2] * q.y(),
            m_floats[3] * q.y() + m_floats[1] * q.m_floats[3] + m_floats[2] * q.x() - m_floats[0] * q.z(),
            m_floats[3] * q.z() + m_floats[2] * q.m_floats[3] + m_floats[0] * q.y() - m_floats[1] * q.x(),
            m_floats[3] * q.m_floats[3] - m_floats[0] * q.x() - m_floats[1] * q.y() - m_floats[2] * q.z());
        return *this;
    }
        TF2_PUBLIC
    tf2Scalar dot(const Quaternion& q) const
    {
        return m_floats[0] * q.x() + m_floats[1] * q.y() + m_floats[2] * q.z() + m_floats[3] * q.m_floats[3];
    }

        TF2_PUBLIC
    tf2Scalar length2() const
    {
        return dot(*this);
    }

        TF2_PUBLIC
    tf2Scalar length() const
    {
        return tf2Sqrt(length2());
    }

        TF2_PUBLIC
    Quaternion& normalize()
    {
        return *this /= length();
    }

    TF2SIMD_FORCE_INLINE Quaternion
    operator*(const tf2Scalar& s) const
    {
        return Quaternion(x() * s, y() * s, z() * s, m_floats[3] * s);
    }


        TF2_PUBLIC
    Quaternion operator/(const tf2Scalar& s) const
    {
        tf2Assert(s != tf2Scalar(0.0));
        return *this * (tf2Scalar(1.0) / s);
    }

        TF2_PUBLIC
    Quaternion& operator/=(const tf2Scalar& s)
    {
        tf2Assert(s != tf2Scalar(0.0));
        return *this *= tf2Scalar(1.0) / s;
    }

        TF2_PUBLIC
    Quaternion normalized() const
    {
        return *this / length();
    }
        TF2_PUBLIC
    tf2Scalar angle(const Quaternion& q) const
    {
        tf2Scalar s = tf2Sqrt(length2() * q.length2());
        tf2Assert(s != tf2Scalar(0.0));
        return tf2Acos(dot(q) / s);
    }
        TF2_PUBLIC
    tf2Scalar angleShortestPath(const Quaternion& q) const
    {
        tf2Scalar s = tf2Sqrt(length2() * q.length2());
        tf2Assert(s != tf2Scalar(0.0));
        if (dot(q) < 0) // Take care of long angle case see http://en.wikipedia.org/wiki/Slerp
            return tf2Acos(dot(-q) / s) * tf2Scalar(2.0);
        else
            return tf2Acos(dot(q) / s) * tf2Scalar(2.0);
    }
        TF2_PUBLIC
    tf2Scalar getAngle() const
    {
        tf2Scalar s = tf2Scalar(2.) * tf2Acos(m_floats[3]);
        return s;
    }

        TF2_PUBLIC
    tf2Scalar getAngleShortestPath() const
    {
    tf2Scalar s;
        if (m_floats[3] >= 0)
            s = tf2Scalar(2.) * tf2Acos(m_floats[3]);
        else
            s = tf2Scalar(2.) * tf2Acos(-m_floats[3]);

        return s;
    }

        TF2_PUBLIC
    Vector3 getAxis() const
    {
        tf2Scalar s_squared = tf2Scalar(1.) - tf2Pow(m_floats[3], tf2Scalar(2.));
        if (s_squared < tf2Scalar(10.) * TF2SIMD_EPSILON) //Check for divide by zero
            return Vector3(1.0, 0.0, 0.0);  // Arbitrary
        tf2Scalar s = tf2Sqrt(s_squared);
        return Vector3(m_floats[0] / s, m_floats[1] / s, m_floats[2] / s);
    }

        TF2_PUBLIC
    Quaternion inverse() const
    {
        return Quaternion(-m_floats[0], -m_floats[1], -m_floats[2], m_floats[3]);
    }

    TF2SIMD_FORCE_INLINE Quaternion
    operator+(const Quaternion& q2) const
    {
        const Quaternion& q1 = *this;
        return Quaternion(q1.x() + q2.x(), q1.y() + q2.y(), q1.z() + q2.z(), q1.m_floats[3] + q2.m_floats[3]);
    }

    TF2SIMD_FORCE_INLINE Quaternion
    operator-(const Quaternion& q2) const
    {
        const Quaternion& q1 = *this;
        return Quaternion(q1.x() - q2.x(), q1.y() - q2.y(), q1.z() - q2.z(), q1.m_floats[3] - q2.m_floats[3]);
    }

    TF2SIMD_FORCE_INLINE Quaternion operator-() const
    {
        const Quaternion& q2 = *this;
        return Quaternion( - q2.x(), - q2.y(),  - q2.z(),  - q2.m_floats[3]);
    }
    TF2SIMD_FORCE_INLINE Quaternion farthest( const Quaternion& qd) const
    {
        Quaternion diff,sum;
        diff = *this - qd;
        sum = *this + qd;
        if( diff.dot(diff) > sum.dot(sum) )
            return qd;
        return (-qd);
    }

    TF2SIMD_FORCE_INLINE Quaternion nearest( const Quaternion& qd) const
    {
        Quaternion diff,sum;
        diff = *this - qd;
        sum = *this + qd;
        if( diff.dot(diff) < sum.dot(sum) )
            return qd;
        return (-qd);
    }


        TF2_PUBLIC
    Quaternion slerp(const Quaternion& q, const tf2Scalar& t) const
    {
          tf2Scalar theta = angleShortestPath(q) / tf2Scalar(2.0);
        if (theta != tf2Scalar(0.0))
        {
            tf2Scalar d = tf2Scalar(1.0) / tf2Sin(theta);
            tf2Scalar s0 = tf2Sin((tf2Scalar(1.0) - t) * theta);
            tf2Scalar s1 = tf2Sin(t * theta);
                        if (dot(q) < 0) // Take care of long angle case see http://en.wikipedia.org/wiki/Slerp
                          return Quaternion((m_floats[0] * s0 + -q.x() * s1) * d,
                                              (m_floats[1] * s0 + -q.y() * s1) * d,
                                              (m_floats[2] * s0 + -q.z() * s1) * d,
                                              (m_floats[3] * s0 + -q.m_floats[3] * s1) * d);
                        else
                          return Quaternion((m_floats[0] * s0 + q.x() * s1) * d,
                                              (m_floats[1] * s0 + q.y() * s1) * d,
                                              (m_floats[2] * s0 + q.z() * s1) * d,
                                              (m_floats[3] * s0 + q.m_floats[3] * s1) * d);

        }
        else
        {
            return *this;
        }
    }

        TF2_PUBLIC
    static const Quaternion&    getIdentity()
    {
        static const Quaternion identityQuat(tf2Scalar(0.),tf2Scalar(0.),tf2Scalar(0.),tf2Scalar(1.));
        return identityQuat;
    }

    TF2SIMD_FORCE_INLINE const tf2Scalar& getW() const { return m_floats[3]; }


};


TF2SIMD_FORCE_INLINE Quaternion
operator-(const Quaternion& q)
{
    return Quaternion(-q.x(), -q.y(), -q.z(), -q.w());
}



TF2SIMD_FORCE_INLINE Quaternion
operator*(const Quaternion& q1, const Quaternion& q2) {
    return Quaternion(q1.w() * q2.x() + q1.x() * q2.w() + q1.y() * q2.z() - q1.z() * q2.y(),
        q1.w() * q2.y() + q1.y() * q2.w() + q1.z() * q2.x() - q1.x() * q2.z(),
        q1.w() * q2.z() + q1.z() * q2.w() + q1.x() * q2.y() - q1.y() * q2.x(),
        q1.w() * q2.w() - q1.x() * q2.x() - q1.y() * q2.y() - q1.z() * q2.z());
}

TF2SIMD_FORCE_INLINE Quaternion
operator*(const Quaternion& q, const Vector3& w)
{
    return Quaternion( q.w() * w.x() + q.y() * w.z() - q.z() * w.y(),
        q.w() * w.y() + q.z() * w.x() - q.x() * w.z(),
        q.w() * w.z() + q.x() * w.y() - q.y() * w.x(),
        -q.x() * w.x() - q.y() * w.y() - q.z() * w.z());
}

TF2SIMD_FORCE_INLINE Quaternion
operator*(const Vector3& w, const Quaternion& q)
{
    return Quaternion( w.x() * q.w() + w.y() * q.z() - w.z() * q.y(),
        w.y() * q.w() + w.z() * q.x() - w.x() * q.z(),
        w.z() * q.w() + w.x() * q.y() - w.y() * q.x(),
        -w.x() * q.x() - w.y() * q.y() - w.z() * q.z());
}

TF2SIMD_FORCE_INLINE tf2Scalar
dot(const Quaternion& q1, const Quaternion& q2)
{
    return q1.dot(q2);
}


TF2SIMD_FORCE_INLINE tf2Scalar
length(const Quaternion& q)
{
    return q.length();
}

TF2SIMD_FORCE_INLINE tf2Scalar
angle(const Quaternion& q1, const Quaternion& q2)
{
    return q1.angle(q2);
}

TF2SIMD_FORCE_INLINE tf2Scalar
angleShortestPath(const Quaternion& q1, const Quaternion& q2)
{
    return q1.angleShortestPath(q2);
}

TF2SIMD_FORCE_INLINE Quaternion
inverse(const Quaternion& q)
{
    return q.inverse();
}

TF2SIMD_FORCE_INLINE Quaternion
slerp(const Quaternion& q1, const Quaternion& q2, const tf2Scalar& t)
{
    return q1.slerp(q2, t);
}

TF2SIMD_FORCE_INLINE Vector3
quatRotate(const Quaternion& rotation, const Vector3& v)
{
    Quaternion q = rotation * v;
    q *= rotation.inverse();
    return Vector3(q.getX(),q.getY(),q.getZ());
}

TF2SIMD_FORCE_INLINE Quaternion
shortestArcQuat(const Vector3& v0, const Vector3& v1) // Game Programming Gems 2.10. make sure v0,v1 are normalized
{
    Vector3 c = v0.cross(v1);
    tf2Scalar  d = v0.dot(v1);

    if (d < -1.0 + TF2SIMD_EPSILON)
    {
        Vector3 n,unused;
        tf2PlaneSpace1(v0,n,unused);
        return Quaternion(n.x(),n.y(),n.z(),0.0f); // just pick any vector that is orthogonal to v0
    }

    tf2Scalar  s = tf2Sqrt((1.0f + d) * 2.0f);
    tf2Scalar rs = 1.0f / s;

    return Quaternion(c.getX()*rs,c.getY()*rs,c.getZ()*rs,s * 0.5f);
}

TF2SIMD_FORCE_INLINE Quaternion
shortestArcQuatNormalize2(Vector3& v0,Vector3& v1)
{
    v0.normalize();
    v1.normalize();
    return shortestArcQuat(v0,v1);
}

}
#endif  // TF2__LINEARMATH__QUATERNION_HPP_