/****************************************************************************************
 * \file      SHMathHelpers.h
 * \author    Diren D Bharwani, diren.dbharwani, 390002520
 * \brief     Interface for various mathematical helper functions.
 *
 * \copyright Copyright (C) 2022 DigiPen Institute of Technology. Reproduction or
 *            disclosure of this file or its contents without the prior written consent
 *            of DigiPen Institute of Technology is prohibited.
****************************************************************************************/

#pragma once

#include <type_traits>
#include <numeric>
#include <numbers>
#include <random>


namespace SHADE
{
  /*-----------------------------------------------------------------------------------*/
  /* Concepts                                                                          */
  /*-----------------------------------------------------------------------------------*/

  template <typename T>
  concept IsArithmetic                = std::is_arithmetic_v<T>;

  template <typename T>
  concept IsIntegral                  = std::is_integral_v<T>;

  template <typename T>
  concept IsFloatingPoint             = std::is_floating_point_v<T>;

  /*-----------------------------------------------------------------------------------*/
  /* Type Definitions                                                                  */
  /*-----------------------------------------------------------------------------------*/

  class SHMath
  {
  public:
    /*---------------------------------------------------------------------------------*/
    /* Static Data Members                                                             */
    /*---------------------------------------------------------------------------------*/

    /** Standard Epsilon value for comparing Single-Precision Floating-Point values. */
    static constexpr float EPSILON    = 0.001f;
    
    /** Single-Precision Floating-Point value of infinity */ 
    static constexpr float INF        = std::numeric_limits<float>::infinity();

    static constexpr float PI         = std::numbers::pi_v<float>;
    static constexpr float HALF_PI    = PI * 0.5f;
    static constexpr float TWO_PI     = 2.0f * PI;

    /*---------------------------------------------------------------------------------*/
    /* Static Function Members                                                         */
    /*---------------------------------------------------------------------------------*/

    static void                       Initialise            ();

    template <IsArithmetic T>
    [[nodiscard]] static constexpr T  DegreesToRadians      (T angleInDeg);

    template <IsArithmetic T>
    [[nodiscard]] static constexpr T  RadiansToDegrees      (T angleInRad);

    template <IsArithmetic T>
    [[nodiscard]] static T            Lerp                  (T a, T b, T alpha);

    template <IsArithmetic T>
    [[nodiscard]] static T            ClampedLerp           (T a, T b, T alpha, T alphaMin, T alphaMax);

    template <IsArithmetic T>
    [[nodiscard]] static T            Wrap                  (T value, T min, T max);

    template <IsArithmetic T = float>
    [[nodiscard]] static T            GenerateRandomNumber  (T lowerBound = 0, T upperBound = 1);

    /**
     * @brief   Compares two floating-point values for equality within given tolerances.
     * @tparam  T             A floating-point type
     * @param   lhs           A floating-point value.
     * @param   rhs           A floating-point value.
     * @param   absTolerance  The absolute tolerance to compare the values for equality.
     * @param   relTolerance  The relative tolerance for comparing large values for equality.
     * @returns True if the values are equal within the specified tolerances.
     */
    template <IsFloatingPoint T = float>
    [[nodiscard]] static bool       CompareFloat            (T lhs, T rhs, T absTolerance = EPSILON, T relTolerance = EPSILON);

  private:
    /*---------------------------------------------------------------------------------*/
    /* Static Data Members                                                             */
    /*---------------------------------------------------------------------------------*/
    static std::default_random_engine rng;
  };

} // namespace SHADE

#include "SHMathHelpers.hpp"