using DecimalMath;
using InnovEnergy.Lib.Utils;

namespace InnovEnergy.Lib.Units;

using T = Angle;

public readonly struct Angle
{


    public static String Unit   => "rad"; 
    public static String Symbol => "∠"; 

    public static readonly Angle Pi = new Angle(DecimalEx.Pi);
    
    public Decimal Value { get; }

    public Angle(Decimal value)
    {
        var modulo = value.Modulo(DecimalEx.TwoPi);
        
        Value = modulo > DecimalEx.Pi 
              ? modulo - DecimalEx.TwoPi 
              : modulo;
    }

    public override String ToString() => Value + Unit;


    #region scalar multiplication

    public static Angle operator *(Decimal scalar, Angle   angle ) => new Angle(scalar * angle.Value);
    public static Angle operator *(Angle   angle , Decimal scalar) => new Angle(scalar * angle.Value);
    public static Angle operator /(Angle   angle , Decimal scalar) => new Angle(angle.Value / scalar);

    #endregion

    #region addition

    public static T operator +(T left, T right) => new T(left.Value + right.Value);
    public static T operator -(T left, T right) => new T(left.Value - right.Value);
    public static T operator -(T t) => new T(-t.Value);

    #endregion
    
    #region compare

    public static Boolean operator ==(T left, T right) => left.Value == right.Value;
    public static Boolean operator !=(T left, T right) => left.Value != right.Value;
    public static Boolean operator > (T left, T right) => left.Value > right.Value;
    public static Boolean operator < (T left, T right) => left.Value < right.Value;
    public static Boolean operator >=(T left, T right) => left.Value >= right.Value;
    public static Boolean operator <=(T left, T right) => left.Value <= right.Value;

    #endregion

    #region conversion

    public static implicit operator T(Decimal d) => new T(d);
    public static implicit operator T(Double d)  => new T((Decimal)d);
    public static implicit operator T(Int32 i)   => new T(i);
    public static implicit operator Decimal(T t) => t.Value;

    #endregion

    #region equality

    public override Boolean Equals(Object? obj) => obj is T other && Equals(other);
    public override Int32 GetHashCode() => Value.GetHashCode();

    #endregion
}