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 * OpenSpace                                                                             *
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 * Copyright (c) 2014-2017                                                               *
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#include <modules/globebrowsing/geometry/angle.h>

namespace openspace {
namespace globebrowsing {

template <typename T>
const T Angle<T>::PI = 3.14159265358979323846264338327950;

template <typename T>
const T Angle<T>::EPSILON = 1e-10; // Should depend on the typedef /eb 

//////////////////////////////////////////////////////////////////////////////////////////
//                             STATIC CONSTANTS                                         //
//////////////////////////////////////////////////////////////////////////////////////////

template <typename T>
const Angle<T> Angle<T>::ZERO = Angle::fromRadians(0);

template <typename T>
const Angle<T> Angle<T>::QUARTER = Angle::fromRadians(PI/2);

template <typename T>
const Angle<T> Angle<T>::HALF = Angle::fromRadians(PI);

template <typename T>
const Angle<T> Angle<T>::FULL = Angle::fromRadians(2*PI);

//////////////////////////////////////////////////////////////////////////////////////////
//                                 Constructors                                         //
//////////////////////////////////////////////////////////////////////////////////////////

template <typename T> Angle<T>::Angle(const Angle<T>& other)
    : _radians(other._radians) { }

template <typename T> Angle<T>::Angle(T radians)
    : _radians(radians) { }

//////////////////////////////////////////////////////////////////////////////////////////
//                                 Factory Methods                                      //
//////////////////////////////////////////////////////////////////////////////////////////

template <typename T>
Angle<T> Angle<T>::fromRadians(T rads) {
    return Angle<T>(rads);
}

template <typename T>
Angle<T> Angle<T>::fromDegrees(T degrees) {
    return Angle<T>(degrees * PI / 180.0);
}

template <typename T>
Angle<T> Angle<T>::fromRevolutions(T revs) {
    return Angle<T>(revs * 2 * PI);
}

//////////////////////////////////////////////////////////////////////////////////////////
//                                     Conversions                                      //
//////////////////////////////////////////////////////////////////////////////////////////

template <typename T>
T Angle<T>::asRadians() const {
    return _radians;
}

template <typename T>
T Angle<T>::asDegrees() const {
    return _radians * 180.0 / PI;
}

template <typename T>
T Angle<T>::asRevolutions() const {
    return _radians / (2 * PI);
}

//////////////////////////////////////////////////////////////////////////////////////////
//                                     Operators                                        //
//////////////////////////////////////////////////////////////////////////////////////////

template <typename T>
Angle<T> Angle<T>::operator+(const Angle<T>& rhs) const{
    return Angle<T>(_radians + rhs._radians);
}

template <typename T>
Angle<T> Angle<T>::operator-(const Angle<T>& rhs) const{
    return Angle<T>(_radians - rhs._radians);
}

template <typename T>
Angle<T> Angle<T>::operator*(T multiplier) const{
    return Angle<T>(_radians * multiplier);
}

template <typename T>
Angle<T> Angle<T>::operator/(T divisor) const{
    return Angle<T>(_radians / divisor);
}

template <typename T>
Angle<T> Angle<T>::operator-() const {
    return Angle<T>(-_radians);
}

template <typename T>
void Angle<T>::operator+=(const Angle<T>& rhs){
    _radians += rhs._radians;
}

template <typename T>
void Angle<T>::operator-=(const Angle<T>& rhs){
    _radians -= rhs._radians;
}

template <typename T>
void Angle<T>::operator*=(T multiplier){
    _radians *= multiplier;
}

template <typename T>
void Angle<T>::operator/=(T divisor){
    _radians /= divisor;
}

template <typename T>
bool Angle<T>::operator<(const Angle<T>& rhs) const{
    return _radians < rhs._radians;
}

template <typename T>
bool Angle<T>::operator<=(const Angle<T>& rhs) const{
    return _radians <= rhs._radians;
}

template <typename T>
bool Angle<T>::operator>(const Angle<T>& rhs) const{
    return _radians > rhs._radians;
}

template <typename T>
bool Angle<T>::operator>=(const Angle<T>& rhs) const{
    return _radians >= rhs._radians;
}

template <typename T>
bool Angle<T>::operator==(const Angle<T>& rhs) const{
    return _radians == rhs._radians;
}

template <typename T>
bool Angle<T>::operator!=(const Angle<T>& rhs) const{
    return _radians != rhs._radians;
}

//////////////////////////////////////////////////////////////////////////////////////////
//                            Chainable Relative Mutators                               //
//////////////////////////////////////////////////////////////////////////////////////////

template <typename T>
Angle<T>& Angle<T>::normalize() {
    // this will cause _radians to be in value range ]-2pi, 2pi[
    _radians = fmod(_radians, 2*PI);

    // ensure _radians are positive, ie in value range [0, 2pi[
    if (_radians < 0.0){
        _radians += 2 * PI;
    }

    return *this;
}

template <typename T>
Angle<T>& Angle<T>::normalizeAround(const Angle<T>& center) {
    _radians -= center._radians + PI;
    normalize();
    _radians += center._radians - PI;
    return *this;
}

template <typename T>
Angle<T>& Angle<T>::clamp(const Angle<T>& min, const Angle<T>& max) {
    _radians = _radians < min._radians ? min._radians
        : _radians > max._radians ? max._radians
        : _radians;
    return *this;
}


template <typename T>
Angle<T>& Angle<T>::abs(){
    _radians = glm::abs(_radians);
    return *this;
}

//////////////////////////////////////////////////////////////////////////////////////////
//                         Chainable Relative Factory Methods                           //
//////////////////////////////////////////////////////////////////////////////////////////

template <typename T>
Angle<T> Angle<T>::getNormalized() const {
    return Angle<T>(*this).normalize();
}

template <typename T>
Angle<T> Angle<T>::getNormalizedAround(const Angle<T>& center) const {
    return Angle<T>(*this).normalizeAround(center);
}

template <typename T>
Angle<T> Angle<T>::getClamped(const Angle<T>& min, const Angle<T>& max) const {
    return Angle<T>(*this).clamp(min, max);
}

template <typename T>
Angle<T> Angle<T>::getAbs() const {
    return Angle<T>(*this).abs();
}

} // namespace globebrowsing
} // namespace openspace