// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0.If a copy of the MPL was not distributed with this
// file, You can obtain one at https ://mozilla.org/MPL/2.0/.

#ifndef ANGLE_H
#define ANGLE_H

namespace Passer {
namespace LinearAlgebra {

static float pi = 3.1415927410125732421875F;

static float Rad2Deg = 360.0f / (pi * 2);
static float Deg2Rad = (pi * 2) / 360.0f;

template <typename T> class AngleOf {
public:
  AngleOf<T>();

  static AngleOf<T> Degrees(float f);
  static AngleOf<T> Radians(float f);
  static AngleOf<T> Binary(T x);

  // const static AngleOf<T> zero;
  // const static AngleOf<T> deg90;
  // const static AngleOf<T> deg180;

  float InDegrees() const;
  float InRadians() const;

  inline T GetBinary() const { return this->value; }
  inline void SetBinary(T x) { this->value = x; }

  bool operator==(const AngleOf<T> a) const;
  bool operator>(AngleOf<T> a) const;
  bool operator>=(AngleOf<T> a) const;
  bool operator<(AngleOf<T> a) const;
  bool operator<=(AngleOf<T> a) const;

  static signed int Sign(AngleOf<T> a);
  static AngleOf<T> Abs(AngleOf<T> a);

  AngleOf<T> operator-() const;
  AngleOf<T> operator-(const AngleOf<T> &a) const;
  AngleOf<T> operator+(const AngleOf<T> &a) const;
  AngleOf<T> operator+=(const AngleOf<T> &a);

  friend AngleOf<T> operator*(const AngleOf<T> &a, float f) {
    return AngleOf::Degrees((float)a.InDegrees() * f);
  }
  friend AngleOf<T> operator*(float f, const AngleOf<T> &a) {
    return AngleOf::Degrees((float)f * a.InDegrees());
  }

  void Normalize();
  static AngleOf<T> Normalize(AngleOf<T> a);
  static AngleOf<T> Clamp(AngleOf<T> a, AngleOf<T> min, AngleOf<T> max);
  // static AngleOf<T> Difference(AngleOf<T> a, AngleOf<T> b) {
  //   AngleOf<T> r = Normalize(b.InDegrees() - a.InDegrees());
  //   return r;
  // };
  static AngleOf<T> MoveTowards(AngleOf<T> fromAngle, AngleOf<T> toAngle,
                                float maxAngle);

  static float Cos(AngleOf<T> a);
  static float Sin(AngleOf<T> a);
  static float Tan(AngleOf<T> a);

  static AngleOf<T> Acos(float f);
  static AngleOf<T> Asin(float f);
  static AngleOf<T> Atan(float f);
  static AngleOf<T> Atan2(float f1, float f2);

  static float CosineRuleSide(float a, float b, AngleOf<T> gamma);
  static AngleOf<T> CosineRuleAngle(float a, float b, float c);

  static AngleOf<T> SineRuleAngle(float a, AngleOf<T> beta, float c);

private:
  T value;

  AngleOf<T>(T value);
  // These are deprecated, will move to private.
  // Use Degrees/Radians instead
  // AngleOf(signed int f);
  // AngleOf(float f);
};

using Angle = AngleOf<float>;
using AngleSingle = AngleOf<float>;
using Angle16 = AngleOf<signed short>;
using Angle8 = AngleOf<signed char>;

} // namespace LinearAlgebra
} // namespace Passer
using namespace Passer::LinearAlgebra;

#endif