/************************************************************************************//*!
\file           Math.hxx
\author         Tng Kah Wei, kahwei.tng, 390009620
\par            email: kahwei.tng\@digipen.edu
\date           Nov 11, 2021
\brief          Contains the definition of the managed Math static class.
 
                Note: This file is written in C++17/CLI.

Copyright (C) 2021 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

namespace SHADE
{
    /// <summary>
    /// Contains utility Math functions.
    /// </summary>
    public ref class Math abstract sealed
    {
      public:
        /*-----------------------------------------------------------------------------*/
        /* Static Constants                                                            */
        /*-----------------------------------------------------------------------------*/
        /// <summary>
        /// Degrees-to-radians conversion constant
        /// </summary>
        static constexpr float Deg2Rad = System::Math::PI / 180.0f;
        /// <summary>
        /// Radians-to-degrees conversion constant
        /// </summary>
        static constexpr float Rad2Deg = 180.0f / System::Math::PI;
        /// <summary>
        /// Small value used for single precision floating point comparisons.
        /// </summary>
        static constexpr float Epsilon = 0.001f;

        /*-----------------------------------------------------------------------------*/
        /* Utility Functions                                                           */
        /*-----------------------------------------------------------------------------*/
        /// <summary>
        /// Wraps a value if they get to low or too high. 
        /// </summary>
        /// <param name="value">Value to wrap.</param>
        /// <param name="min">Minimum value to wrap at.</param>
        /// <param name="max">Maximum value to wrap at.</param>
        /// <returns>Wrapped value.</returns>
        static float Wrap(float value, float min, float max);
        /// <summary>
        /// Converts an angle from degree representation to radian representation.
        /// </summary>
        /// <param name="degrees">Degree-based angle to convert.</param>
        /// <returns>The specified angle in radians.</returns>
        static float DegreesToRadians(float degrees);
        /// <summary>
        /// Converts an angle from radian representation to degree representation.
        /// </summary>
        /// <param name="radians">Radian-based angle to convert.</param>
        /// <returns>The specified angle in degrees.</returns>
        static float RadiansToDegrees(float radians);
        /// <summary>
        /// Linearly interpolates between a and b by t. 
        /// The parameter t is clamped to the range [0, 1].
        /// </summary>
        /// <param name="a">The start value.</param>
        /// <param name="b">The end value.</param>
        /// <param name="t">The interpolation value between the two float.</param>
        /// <returns>The interpolated float result between the two float values.</returns>
        static float Lerp(float a, float b, float t);
        /// <summary>
        /// Linearly interpolates between a and b by t. 
        /// The parameter t is not clamped and a value based on a and b is supported. 
        /// If t is less than zero, or greater than one, then LerpUnclamped will result 
        /// in a return value outside the range a to b.
        /// </summary>
        /// <param name="a">The start value.</param>
        /// <param name="b">The end value.</param>
        /// <param name="t">The interpolation value between the two float.</param>
        /// <returns>The interpolated float result between the two float values.</returns>
        static float LerpUnclamped(float a, float b, float t);
        /// <summary>
        /// Calculates the linear parameter t that produces the interpolant value within the range [a, b].
        /// </summary>
        /// <param name="a">Start value.</param>
        /// <param name="b">End value.</param>
        /// <param name="value">Value between start and end.</param>
        /// <returns>Percentage of value between start and end.</returns>
        static float InverseLerp(float a, float b, float value);
    };
}