// <copyright file="Complex32.cs" company="Math.NET">
// Math.NET Numerics, part of the Math.NET Project
// http://numerics.mathdotnet.com
// http://github.com/mathnet/mathnet-numerics
//
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using System;
using System.Collections.Generic;
using System.Globalization;
using System.Runtime.InteropServices;
using System.Runtime.Serialization;
using Complex = System.Numerics.Complex;
using BigInteger = System.Numerics.BigInteger;

#if !NETSTANDARD1_3
using System.Runtime;
#endif

namespace IStation.Numerics
{
    /// <summary>
    /// 32-bit single precision complex numbers class.
    /// </summary>
    /// <remarks>
    /// <para>
    /// The class <c>Complex32</c> provides all elementary operations
    /// on complex numbers. All the operators <c>+</c>, <c>-</c>,
    /// <c>*</c>, <c>/</c>, <c>==</c>, <c>!=</c> are defined in the
    /// canonical way. Additional complex trigonometric functions
    /// are also provided. Note that the <c>Complex32</c> structures
    /// has two special constant values <see cref="Complex32.NaN"/> and
    /// <see cref="Complex32.PositiveInfinity"/>.
    /// </para>
    /// <para>
    /// <code>
    /// Complex32 x = new Complex32(1f,2f);
    /// Complex32 y = Complex32.FromPolarCoordinates(1f, Math.Pi);
    /// Complex32 z = (x + y) / (x - y);
    /// </code>
    /// </para>
    /// <para>
    /// For mathematical details about complex numbers, please
    /// have a look at the <a href="http://en.wikipedia.org/wiki/Complex_number">
    /// Wikipedia</a>
    /// </para>
    /// </remarks>
    [Serializable]
    [StructLayout(LayoutKind.Sequential)]
    [DataContract(Namespace = "urn:IStation/Numerics")]
    public readonly struct Complex32 : IFormattable, IEquatable<Complex32>
    {
        /// <summary>
        /// The real component of the complex number.
        /// </summary>
        [DataMember(Order = 1)]
        private readonly float _real;

        /// <summary>
        /// The imaginary component of the complex number.
        /// </summary>
        [DataMember(Order = 2)]
        private readonly float _imag;

        /// <summary>
        /// Initializes a new instance of the Complex32 structure with the given real
        /// and imaginary parts.
        /// </summary>
        /// <param name="real">The value for the real component.</param>
        /// <param name="imaginary">The value for the imaginary component.</param>
        [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
        public Complex32(float real, float imaginary)
        {
            _real = real;
            _imag = imaginary;
        }

        /// <summary>
        /// Creates a complex number from a point's polar coordinates.
        /// </summary>
        /// <returns>A complex number.</returns>
        /// <param name="magnitude">The magnitude, which is the distance from the origin (the intersection of the x-axis and the y-axis) to the number.</param>
        /// <param name="phase">The phase, which is the angle from the line to the horizontal axis, measured in radians.</param>
        public static Complex32 FromPolarCoordinates(float magnitude, float phase)
        {
            return new Complex32(magnitude * (float)Math.Cos(phase), magnitude * (float)Math.Sin(phase));
        }

        /// <summary>
        /// Returns a new <see cref="T:IStation.Numerics.Complex32" /> instance
        /// with a real number equal to zero and an imaginary number equal to zero.
        /// </summary>
        public static readonly Complex32 Zero = new Complex32(0.0f, 0.0f);

        /// <summary>
        /// Returns a new <see cref="T:IStation.Numerics.Complex32" /> instance
        /// with a real number equal to one and an imaginary number equal to zero.
        /// </summary>
        public static readonly Complex32 One = new Complex32(1.0f, 0.0f);

        /// <summary>
        /// Returns a new <see cref="T:IStation.Numerics.Complex32" /> instance
        /// with a real number equal to zero and an imaginary number equal to one.
        /// </summary>
        public static readonly Complex32 ImaginaryOne = new Complex32(0, 1);

        /// <summary>
        /// Returns a new <see cref="T:IStation.Numerics.Complex32" /> instance
        /// with real and imaginary numbers positive infinite.
        /// </summary>
        public static readonly Complex32 PositiveInfinity = new Complex32(float.PositiveInfinity, float.PositiveInfinity);

        /// <summary>
        /// Returns a new <see cref="T:IStation.Numerics.Complex32" /> instance
        /// with real and imaginary numbers not a number.
        /// </summary>
        public static readonly Complex32 NaN = new Complex32(float.NaN, float.NaN);

        /// <summary>
        /// Gets the real component of the complex number.
        /// </summary>
        /// <value>The real component of the complex number.</value>
        public float Real
        {
            [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
            get => _real;
        }

        /// <summary>
        /// Gets the real imaginary component of the complex number.
        /// </summary>
        /// <value>The real imaginary component of the complex number.</value>
        public float Imaginary
        {
            [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
            get => _imag;
        }

        /// <summary>
        /// Gets the phase or argument of this <c>Complex32</c>.
        /// </summary>
        /// <remarks>
        /// Phase always returns a value bigger than negative Pi and
        /// smaller or equal to Pi. If this <c>Complex32</c> is zero, the Complex32
        /// is assumed to be positive real with an argument of zero.
        /// </remarks>
        /// <returns>The phase or argument of this <c>Complex32</c></returns>
        public float Phase
        {
            // NOTE: the special case for negative real numbers fixes negative-zero value behavior. Do not remove.
            [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
            get => _imag == 0f && _real < 0f ? (float)Constants.Pi : (float)Math.Atan2(_imag, _real);
        }

        /// <summary>
        /// Gets the magnitude (or absolute value) of a complex number.
        /// </summary>
        /// <remarks>Assuming that magnitude of (inf,a) and (a,inf) and (inf,inf) is inf and (NaN,a), (a,NaN) and (NaN,NaN) is NaN</remarks>
        /// <returns>The magnitude of the current instance.</returns>
        public float Magnitude
        {
            [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
            get
            {
                if (float.IsNaN(_real) || float.IsNaN(_imag))
                    return float.NaN;
                if (float.IsInfinity(_real) || float.IsInfinity(_imag))
                    return float.PositiveInfinity;
                float a = Math.Abs(_real);
                float b = Math.Abs(_imag);
                if (a > b)
                {
                    double tmp = b / a;
                    return a * (float)Math.Sqrt(1.0f + tmp * tmp);

                }
                if (a == 0.0f) // one can write a >= float.Epsilon here
                {
                    return b;
                }
                else
                {
                    double tmp = a / b;
                    return b * (float)Math.Sqrt(1.0f + tmp * tmp);
                }
            }
        }

        /// <summary>
        /// Gets the squared magnitude (or squared absolute value) of a complex number.
        /// </summary>
        /// <returns>The squared magnitude of the current instance.</returns>
        public float MagnitudeSquared => _real * _real + _imag * _imag;

        /// <summary>
        /// Gets the unity of this complex (same argument, but on the unit circle; exp(I*arg))
        /// </summary>
        /// <returns>The unity of this <c>Complex32</c>.</returns>
        public Complex32 Sign
        {
            get
            {
                if (float.IsPositiveInfinity(_real) && float.IsPositiveInfinity(_imag))
                {
                    return new Complex32((float)Constants.Sqrt1Over2, (float)Constants.Sqrt1Over2);
                }

                if (float.IsPositiveInfinity(_real) && float.IsNegativeInfinity(_imag))
                {
                    return new Complex32((float)Constants.Sqrt1Over2, -(float)Constants.Sqrt1Over2);
                }

                if (float.IsNegativeInfinity(_real) && float.IsPositiveInfinity(_imag))
                {
                    return new Complex32(-(float)Constants.Sqrt1Over2, -(float)Constants.Sqrt1Over2);
                }

                if (float.IsNegativeInfinity(_real) && float.IsNegativeInfinity(_imag))
                {
                    return new Complex32(-(float)Constants.Sqrt1Over2, (float)Constants.Sqrt1Over2);
                }

                // don't replace this with "Magnitude"!
                var mod = SpecialFunctions.Hypotenuse(_real, _imag);
                if (mod == 0.0f)
                {
                    return Zero;
                }

                return new Complex32(_real / mod, _imag / mod);
            }
        }

        /// <summary>
        /// Gets a value indicating whether the <c>Complex32</c> is zero.
        /// </summary>
        /// <returns><c>true</c> if this instance is zero; otherwise, <c>false</c>.</returns>
        public bool IsZero()
        {
            return _real == 0.0f && _imag == 0.0f;
        }

        /// <summary>
        /// Gets a value indicating whether the <c>Complex32</c> is one.
        /// </summary>
        /// <returns><c>true</c> if this instance is one; otherwise, <c>false</c>.</returns>
        public bool IsOne()
        {
            return _real == 1.0f && _imag == 0.0f;
        }

        /// <summary>
        /// Gets a value indicating whether the <c>Complex32</c> is the imaginary unit.
        /// </summary>
        /// <returns><c>true</c> if this instance is ImaginaryOne; otherwise, <c>false</c>.</returns>
        public bool IsImaginaryOne()
        {
            return _real == 0.0f && _imag == 1.0f;
        }

        /// <summary>
        /// Gets a value indicating whether the provided <c>Complex32</c>evaluates
        /// to a value that is not a number.
        /// </summary>
        /// <returns>
        /// <c>true</c> if this instance is <see cref="NaN"/>; otherwise,
        /// <c>false</c>.
        /// </returns>
        public bool IsNaN()
        {
            return float.IsNaN(_real) || float.IsNaN(_imag);
        }

        /// <summary>
        /// Gets a value indicating whether the provided <c>Complex32</c> evaluates to an
        /// infinite value.
        /// </summary>
        /// <returns>
        ///     <c>true</c> if this instance is infinite; otherwise, <c>false</c>.
        /// </returns>
        /// <remarks>
        /// True if it either evaluates to a complex infinity
        /// or to a directed infinity.
        /// </remarks>
        public bool IsInfinity()
        {
            return float.IsInfinity(_real) || float.IsInfinity(_imag);
        }

        /// <summary>
        /// Gets a value indicating whether the provided <c>Complex32</c> is real.
        /// </summary>
        /// <returns><c>true</c> if this instance is a real number; otherwise, <c>false</c>.</returns>
        public bool IsReal()
        {
            return _imag == 0.0f;
        }

        /// <summary>
        /// Gets a value indicating whether the provided <c>Complex32</c> is real and not negative, that is &gt;= 0.
        /// </summary>
        /// <returns>
        ///     <c>true</c> if this instance is real nonnegative number; otherwise, <c>false</c>.
        /// </returns>
        public bool IsRealNonNegative()
        {
            return _imag == 0.0f && _real >= 0;
        }

        /// <summary>
        /// Exponential of this <c>Complex32</c> (exp(x), E^x).
        /// </summary>
        /// <returns>
        /// The exponential of this complex number.
        /// </returns>
        public Complex32 Exponential()
        {
            var exp = (float)Math.Exp(_real);
            if (IsReal())
            {
                return new Complex32(exp, 0.0f);
            }

            return new Complex32(exp * (float)Math.Cos(_imag), exp * (float)Math.Sin(_imag));
        }

        /// <summary>
        /// Natural Logarithm of this <c>Complex32</c> (Base E).
        /// </summary>
        /// <returns>The natural logarithm of this complex number.</returns>
        public Complex32 NaturalLogarithm()
        {
            if (IsRealNonNegative())
            {
                return new Complex32((float)Math.Log(_real), 0.0f);
            }

            return new Complex32(0.5f * (float)Math.Log(MagnitudeSquared), Phase);
        }

        /// <summary>
        /// Common Logarithm of this <c>Complex32</c> (Base 10).
        /// </summary>
        /// <returns>The common logarithm of this complex number.</returns>
        public Complex32 CommonLogarithm()
        {
            return NaturalLogarithm() / (float)Constants.Ln10;
        }

        /// <summary>
        /// Logarithm of this <c>Complex32</c> with custom base.
        /// </summary>
        /// <returns>The logarithm of this complex number.</returns>
        public Complex32 Logarithm(float baseValue)
        {
            return NaturalLogarithm() / (float)Math.Log(baseValue);
        }

        /// <summary>
        /// Raise this <c>Complex32</c> to the given value.
        /// </summary>
        /// <param name="exponent">
        /// The exponent.
        /// </param>
        /// <returns>
        /// The complex number raised to the given exponent.
        /// </returns>
        public Complex32 Power(Complex32 exponent)
        {
            if (IsZero())
            {
                if (exponent.IsZero())
                {
                    return One;
                }

                if (exponent.Real > 0f)
                {
                    return Zero;
                }

                if (exponent.Real < 0f)
                {
                    return exponent.Imaginary == 0f
                        ? new Complex32(float.PositiveInfinity, 0f)
                        : new Complex32(float.PositiveInfinity, float.PositiveInfinity);
                }

                return NaN;
            }

            return (exponent * NaturalLogarithm()).Exponential();
        }

        /// <summary>
        /// Raise this <c>Complex32</c> to the inverse of the given value.
        /// </summary>
        /// <param name="rootExponent">
        /// The root exponent.
        /// </param>
        /// <returns>
        /// The complex raised to the inverse of the given exponent.
        /// </returns>
        public Complex32 Root(Complex32 rootExponent)
        {
            return Power(1 / rootExponent);
        }

        /// <summary>
        /// The Square (power 2) of this <c>Complex32</c>
        /// </summary>
        /// <returns>
        /// The square of this complex number.
        /// </returns>
        public Complex32 Square()
        {
            if (IsReal())
            {
                return new Complex32(_real * _real, 0.0f);
            }

            return new Complex32((_real * _real) - (_imag * _imag), 2 * _real * _imag);
        }

        /// <summary>
        /// The Square Root (power 1/2) of this <c>Complex32</c>
        /// </summary>
        /// <returns>
        /// The square root of this complex number.
        /// </returns>
        public Complex32 SquareRoot()
        {
            if (IsRealNonNegative())
            {
                return new Complex32((float)Math.Sqrt(_real), 0.0f);
            }

            Complex32 result;

            var absReal = Math.Abs(Real);
            var absImag = Math.Abs(Imaginary);
            double w;
            if (absReal >= absImag)
            {
                var ratio = Imaginary / Real;
                w = Math.Sqrt(absReal) * Math.Sqrt(0.5 * (1.0f + Math.Sqrt(1.0f + (ratio * ratio))));
            }
            else
            {
                var ratio = Real / Imaginary;
                w = Math.Sqrt(absImag) * Math.Sqrt(0.5 * (Math.Abs(ratio) + Math.Sqrt(1.0f + (ratio * ratio))));
            }

            if (Real >= 0.0f)
            {
                result = new Complex32((float)w, (float)(Imaginary / (2.0f * w)));
            }
            else if (Imaginary >= 0.0f)
            {
                result = new Complex32((float)(absImag / (2.0 * w)), (float)w);
            }
            else
            {
                result = new Complex32((float)(absImag / (2.0 * w)), (float)-w);
            }

            return result;
        }

        /// <summary>
        /// Evaluate all square roots of this <c>Complex32</c>.
        /// </summary>
        public Tuple<Complex32, Complex32> SquareRoots()
        {
            var principal = SquareRoot();
            return new Tuple<Complex32, Complex32>(principal, -principal);
        }

        /// <summary>
        /// Evaluate all cubic roots of this <c>Complex32</c>.
        /// </summary>
        public Tuple<Complex32, Complex32, Complex32> CubicRoots()
        {
            float r = (float)Math.Pow(Magnitude, 1d / 3d);
            float theta = Phase / 3;
            const float shift = (float)Constants.Pi2 / 3;
            return new Tuple<Complex32, Complex32, Complex32>(
                FromPolarCoordinates(r, theta),
                FromPolarCoordinates(r, theta + shift),
                FromPolarCoordinates(r, theta - shift));
        }

        /// <summary>
        /// Equality test.
        /// </summary>
        /// <param name="complex1">One of complex numbers to compare.</param>
        /// <param name="complex2">The other complex numbers to compare.</param>
        /// <returns><c>true</c> if the real and imaginary components of the two complex numbers are equal; <c>false</c> otherwise.</returns>
        public static bool operator ==(Complex32 complex1, Complex32 complex2)
        {
            return complex1.Equals(complex2);
        }

        /// <summary>
        /// Inequality test.
        /// </summary>
        /// <param name="complex1">One of complex numbers to compare.</param>
        /// <param name="complex2">The other complex numbers to compare.</param>
        /// <returns><c>true</c> if the real or imaginary components of the two complex numbers are not equal; <c>false</c> otherwise.</returns>
        public static bool operator !=(Complex32 complex1, Complex32 complex2)
        {
            return !complex1.Equals(complex2);
        }

        /// <summary>
        /// Unary addition.
        /// </summary>
        /// <param name="summand">The complex number to operate on.</param>
        /// <returns>Returns the same complex number.</returns>
        public static Complex32 operator +(Complex32 summand)
        {
            return summand;
        }

        /// <summary>
        /// Unary minus.
        /// </summary>
        /// <param name="subtrahend">The complex number to operate on.</param>
        /// <returns>The negated value of the <paramref name="subtrahend"/>.</returns>
        public static Complex32 operator -(Complex32 subtrahend)
        {
            return new Complex32(-subtrahend._real, -subtrahend._imag);
        }

        /// <summary>Addition operator. Adds two complex numbers together.</summary>
        /// <returns>The result of the addition.</returns>
        /// <param name="summand1">One of the complex numbers to add.</param>
        /// <param name="summand2">The other complex numbers to add.</param>
        public static Complex32 operator +(Complex32 summand1, Complex32 summand2)
        {
            return new Complex32(summand1._real + summand2._real, summand1._imag + summand2._imag);
        }

        /// <summary>Subtraction operator. Subtracts two complex numbers.</summary>
        /// <returns>The result of the subtraction.</returns>
        /// <param name="minuend">The complex number to subtract from.</param>
        /// <param name="subtrahend">The complex number to subtract.</param>
        public static Complex32 operator -(Complex32 minuend, Complex32 subtrahend)
        {
            return new Complex32(minuend._real - subtrahend._real, minuend._imag - subtrahend._imag);
        }

        /// <summary>Addition operator. Adds a complex number and float together.</summary>
        /// <returns>The result of the addition.</returns>
        /// <param name="summand1">The complex numbers to add.</param>
        /// <param name="summand2">The float value to add.</param>
        public static Complex32 operator +(Complex32 summand1, float summand2)
        {
            return new Complex32(summand1._real + summand2, summand1._imag);
        }

        /// <summary>Subtraction operator. Subtracts float value from a complex value.</summary>
        /// <returns>The result of the subtraction.</returns>
        /// <param name="minuend">The complex number to subtract from.</param>
        /// <param name="subtrahend">The float value to subtract.</param>
        public static Complex32 operator -(Complex32 minuend, float subtrahend)
        {
            return new Complex32(minuend._real - subtrahend, minuend._imag);
        }

        /// <summary>Addition operator. Adds a complex number and float together.</summary>
        /// <returns>The result of the addition.</returns>
        /// <param name="summand1">The float value to add.</param>
        /// <param name="summand2">The complex numbers to add.</param>
        public static Complex32 operator +(float summand1, Complex32 summand2)
        {
            return new Complex32(summand2._real + summand1, summand2._imag);
        }

        /// <summary>Subtraction operator. Subtracts complex value from a float value.</summary>
        /// <returns>The result of the subtraction.</returns>
        /// <param name="minuend">The float vale to subtract from.</param>
        /// <param name="subtrahend">The complex value to subtract.</param>
        public static Complex32 operator -(float minuend, Complex32 subtrahend)
        {
            return new Complex32(minuend - subtrahend._real, -subtrahend._imag);
        }

        /// <summary>Multiplication operator. Multiplies two complex numbers.</summary>
        /// <returns>The result of the multiplication.</returns>
        /// <param name="multiplicand">One of the complex numbers to multiply.</param>
        /// <param name="multiplier">The other complex number to multiply.</param>
        public static Complex32 operator *(Complex32 multiplicand, Complex32 multiplier)
        {
            return new Complex32(
                (multiplicand._real * multiplier._real) - (multiplicand._imag * multiplier._imag),
                (multiplicand._real * multiplier._imag) + (multiplicand._imag * multiplier._real));
        }

        /// <summary>Multiplication operator. Multiplies a complex number with a float value.</summary>
        /// <returns>The result of the multiplication.</returns>
        /// <param name="multiplicand">The float value to multiply.</param>
        /// <param name="multiplier">The complex number to multiply.</param>
        public static Complex32 operator *(float multiplicand, Complex32 multiplier)
        {
            return new Complex32(multiplier._real * multiplicand, multiplier._imag * multiplicand);
        }

        /// <summary>Multiplication operator. Multiplies a complex number with a float value.</summary>
        /// <returns>The result of the multiplication.</returns>
        /// <param name="multiplicand">The complex number to multiply.</param>
        /// <param name="multiplier">The float value to multiply.</param>
        public static Complex32 operator *(Complex32 multiplicand, float multiplier)
        {
            return new Complex32(multiplicand._real * multiplier, multiplicand._imag * multiplier);
        }

        /// <summary>Division operator. Divides a complex number by another.</summary>
        /// <remarks>Enhanced Smith's algorithm for dividing two complex numbers </remarks>
        /// <see cref="InternalDiv(float, float, float, float, bool)"/>
        /// <returns>The result of the division.</returns>
        /// <param name="dividend">The dividend.</param>
        /// <param name="divisor">The divisor.</param>
        public static Complex32 operator /(Complex32 dividend, Complex32 divisor)
        {
            if (dividend.IsZero() && divisor.IsZero())
            {
                return NaN;
            }

            if (divisor.IsZero())
            {
                return PositiveInfinity;
            }
            float a = dividend.Real;
            float b = dividend.Imaginary;
            float c = divisor.Real;
            float d = divisor.Imaginary;
            if (Math.Abs(d) <= Math.Abs(c))
                return InternalDiv(a, b, c, d, false);
            return InternalDiv(b, a, d, c, true);
        }
        /// <summary>
        ///  Helper method for dividing.
        /// </summary>
        /// <param name="a">Re first</param>
        /// <param name="b">Im first</param>
        /// <param name="c">Re second</param>
        /// <param name="d">Im second</param>
        /// <param name="swapped"></param>
        /// <returns></returns>
        private static Complex32 InternalDiv(float a, float b, float c, float d, bool swapped)
        {
            float r = d / c;
            float t = 1 / (c + d * r);
            float e, f;
            if (r != 0.0f) // one can use r >= float.Epsilon || r <= float.Epsilon instead
            {
                e = (a + b * r) * t;
                f = (b - a * r) * t;
            }
            else
            {
                e = (a + d * (b / c)) * t;
                f = (b - d * (a / c)) * t;
            }
            if (swapped)
                f = -f;
            return new Complex32(e, f);
        }

        /// <summary>Division operator. Divides a float value by a complex number.</summary>
        /// <remarks>Algorithm based on Smith's algorithm</remarks>
        /// <see cref="InternalDiv(float, float, float, float, bool)"/>
        /// <returns>The result of the division.</returns>
        /// <param name="dividend">The dividend.</param>
        /// <param name="divisor">The divisor.</param>
        public static Complex32 operator /(float dividend, Complex32 divisor)
        {
            if (dividend == 0.0f && divisor.IsZero())
            {
                return NaN;
            }

            if (divisor.IsZero())
            {
                return PositiveInfinity;
            }
            float c = divisor.Real;
            float d = divisor.Imaginary;
            if (Math.Abs(d) <= Math.Abs(c))
                return InternalDiv(dividend, 0, c, d, false);
            return InternalDiv(0, dividend, d, c, true);
        }

        /// <summary>Division operator. Divides a complex number by a float value.</summary>
        /// <returns>The result of the division.</returns>
        /// <param name="dividend">The dividend.</param>
        /// <param name="divisor">The divisor.</param>
        public static Complex32 operator /(Complex32 dividend, float divisor)
        {
            if (dividend.IsZero() && divisor == 0.0f)
            {
                return NaN;
            }

            if (divisor == 0.0f)
            {
                return PositiveInfinity;
            }

            return new Complex32(dividend._real / divisor, dividend._imag / divisor);
        }

        /// <summary>
        /// Computes the conjugate of a complex number and returns the result.
        /// </summary>
        public Complex32 Conjugate()
        {
            return new Complex32(_real, -_imag);
        }

        /// <summary>
        /// Returns the multiplicative inverse of a complex number.
        /// </summary>
        public Complex32 Reciprocal()
        {
            if (IsZero())
            {
                return Zero;
            }

            return 1.0f / this;
        }

        #region IFormattable Members

        /// <summary>
        /// Converts the value of the current complex number to its equivalent string representation in Cartesian form.
        /// </summary>
        /// <returns>The string representation of the current instance in Cartesian form.</returns>
        public override string ToString()
        {
            return string.Format(CultureInfo.CurrentCulture, "({0}, {1})", _real, _imag);
        }

        /// <summary>
        /// Converts the value of the current complex number to its equivalent string representation
        /// in Cartesian form by using the specified format for its real and imaginary parts.
        /// </summary>
        /// <returns>The string representation of the current instance in Cartesian form.</returns>
        /// <param name="format">A standard or custom numeric format string.</param>
        /// <exception cref="T:System.FormatException">
        ///   <paramref name="format" /> is not a valid format string.</exception>
        public string ToString(string format)
        {
            return string.Format(CultureInfo.CurrentCulture, "({0}, {1})",
                _real.ToString(format, CultureInfo.CurrentCulture),
                _imag.ToString(format, CultureInfo.CurrentCulture));
        }

        /// <summary>
        /// Converts the value of the current complex number to its equivalent string representation
        /// in Cartesian form by using the specified culture-specific formatting information.
        /// </summary>
        /// <returns>The string representation of the current instance in Cartesian form, as specified by <paramref name="provider" />.</returns>
        /// <param name="provider">An object that supplies culture-specific formatting information.</param>
        public string ToString(IFormatProvider provider)
        {
            return string.Format(provider, "({0}, {1})", _real, _imag);
        }

        /// <summary>Converts the value of the current complex number to its equivalent string representation
        /// in Cartesian form by using the specified format and culture-specific format information for its real and imaginary parts.</summary>
        /// <returns>The string representation of the current instance in Cartesian form, as specified by <paramref name="format" /> and <paramref name="provider" />.</returns>
        /// <param name="format">A standard or custom numeric format string.</param>
        /// <param name="provider">An object that supplies culture-specific formatting information.</param>
        /// <exception cref="T:System.FormatException">
        ///   <paramref name="format" /> is not a valid format string.</exception>
        public string ToString(string format, IFormatProvider provider)
        {
            return string.Format(provider, "({0}, {1})",
                _real.ToString(format, provider),
                _imag.ToString(format, provider));
        }

        #endregion

        #region IEquatable<Complex32> Members

        /// <summary>
        /// Checks if two complex numbers are equal. Two complex numbers are equal if their
        /// corresponding real and imaginary components are equal.
        /// </summary>
        /// <returns>
        /// Returns <c>true</c> if the two objects are the same object, or if their corresponding
        /// real and imaginary components are equal, <c>false</c> otherwise.
        /// </returns>
        /// <param name="other">
        /// The complex number to compare to with.
        /// </param>
        public bool Equals(Complex32 other)
        {
            if (IsNaN() || other.IsNaN())
            {
                return false;
            }

            if (IsInfinity() && other.IsInfinity())
            {
                return true;
            }

            return _real.AlmostEqual(other._real) && _imag.AlmostEqual(other._imag);
        }

        /// <summary>
        /// The hash code for the complex number.
        /// </summary>
        /// <returns>
        /// The hash code of the complex number.
        /// </returns>
        /// <remarks>
        /// The hash code is calculated as
        /// System.Math.Exp(ComplexMath.Absolute(complexNumber)).
        /// </remarks>
        public override int GetHashCode()
        {
            int hash = 27;
            hash = (13 * hash) + _real.GetHashCode();
            hash = (13 * hash) + _imag.GetHashCode();
            return hash;
        }

        /// <summary>
        /// Checks if two complex numbers are equal. Two complex numbers are equal if their
        /// corresponding real and imaginary components are equal.
        /// </summary>
        /// <returns>
        /// Returns <c>true</c> if the two objects are the same object, or if their corresponding
        /// real and imaginary components are equal, <c>false</c> otherwise.
        /// </returns>
        /// <param name="obj">
        /// The complex number to compare to with.
        /// </param>
        public override bool Equals(object obj)
        {
            return (obj is Complex32) && Equals((Complex32)obj);
        }

        #endregion

        #region Parse Functions

        /// <summary>
        /// Creates a complex number based on a string. The string can be in the
        /// following formats (without the quotes): 'n', 'ni', 'n +/- ni',
        /// 'ni +/- n', 'n,n', 'n,ni,' '(n,n)', or '(n,ni)', where n is a float.
        /// </summary>
        /// <returns>
        /// A complex number containing the value specified by the given string.
        /// </returns>
        /// <param name="value">
        /// the string to parse.
        /// </param>
        /// <param name="formatProvider">
        /// An <see cref="IFormatProvider"/> that supplies culture-specific
        /// formatting information.
        /// </param>
        public static Complex32 Parse(string value, IFormatProvider formatProvider = null)
        {
            if (value == null)
            {
                throw new ArgumentNullException(nameof(value));
            }

            value = value.Trim();
            if (value.Length == 0)
            {
                throw new FormatException();
            }

            // strip out parens
            if (value.StartsWith("(", StringComparison.Ordinal))
            {
                if (!value.EndsWith(")", StringComparison.Ordinal))
                {
                    throw new FormatException();
                }

                value = value.Substring(1, value.Length - 2).Trim();
            }

            // keywords
            var numberFormatInfo = formatProvider.GetNumberFormatInfo();
            var textInfo = formatProvider.GetTextInfo();
            var keywords =
                new[]
                {
                    textInfo.ListSeparator, numberFormatInfo.NaNSymbol,
                    numberFormatInfo.NegativeInfinitySymbol, numberFormatInfo.PositiveInfinitySymbol,
                    "+", "-", "i", "j"
                };

            // lexing
            var tokens = new LinkedList<string>();
            GlobalizationHelper.Tokenize(tokens.AddFirst(value), keywords, 0);
            var token = tokens.First;

            // parse the left part
            bool isLeftPartImaginary;
            var leftPart = ParsePart(ref token, out isLeftPartImaginary, formatProvider);
            if (token == null)
            {
                return isLeftPartImaginary ? new Complex32(0, leftPart) : new Complex32(leftPart, 0);
            }

            // parse the right part
            if (token.Value == textInfo.ListSeparator)
            {
                // format: real,imag
                token = token.Next;

                if (isLeftPartImaginary)
                {
                    // left must not contain 'i', right doesn't matter.
                    throw new FormatException();
                }

                bool isRightPartImaginary;
                var rightPart = ParsePart(ref token, out isRightPartImaginary, formatProvider);

                return new Complex32(leftPart, rightPart);
            }
            else
            {
                // format: real + imag
                bool isRightPartImaginary;
                var rightPart = ParsePart(ref token, out isRightPartImaginary, formatProvider);

                if (!(isLeftPartImaginary ^ isRightPartImaginary))
                {
                    // either left or right part must contain 'i', but not both.
                    throw new FormatException();
                }

                return isLeftPartImaginary ? new Complex32(rightPart, leftPart) : new Complex32(leftPart, rightPart);
            }
        }

        /// <summary>
        /// Parse a part (real or complex) from a complex number.
        /// </summary>
        /// <param name="token">Start Token.</param>
        /// <param name="imaginary">Is set to <c>true</c> if the part identified itself as being imaginary.</param>
        /// <param name="format">
        /// An <see cref="IFormatProvider"/> that supplies culture-specific
        /// formatting information.
        /// </param>
        /// <returns>Resulting part as float.</returns>
        /// <exception cref="FormatException"/>
        private static float ParsePart(ref LinkedListNode<string> token, out bool imaginary, IFormatProvider format)
        {
            imaginary = false;
            if (token == null)
            {
                throw new FormatException();
            }

            // handle prefix modifiers
            if (token.Value == "+")
            {
                token = token.Next;

                if (token == null)
                {
                    throw new FormatException();
                }
            }

            var negative = false;
            if (token.Value == "-")
            {
                negative = true;
                token = token.Next;

                if (token == null)
                {
                    throw new FormatException();
                }
            }

            // handle prefix imaginary symbol
            if (String.Compare(token.Value, "i", StringComparison.OrdinalIgnoreCase) == 0
                || String.Compare(token.Value, "j", StringComparison.OrdinalIgnoreCase) == 0)
            {
                imaginary = true;
                token = token.Next;

                if (token == null)
                {
                    return negative ? -1 : 1;
                }
            }

#if NETSTANDARD1_3
            var value = GlobalizationHelper.ParseSingle(ref token);
#else
            var value = GlobalizationHelper.ParseSingle(ref token, format.GetCultureInfo());
#endif

            // handle suffix imaginary symbol
            if (token != null && (String.Compare(token.Value, "i", StringComparison.OrdinalIgnoreCase) == 0
                                  || String.Compare(token.Value, "j", StringComparison.OrdinalIgnoreCase) == 0))
            {
                if (imaginary)
                {
                    // only one time allowed: either prefix or suffix, or neither.
                    throw new FormatException();
                }

                imaginary = true;
                token = token.Next;
            }

            return negative ? -value : value;
        }

        /// <summary>
        /// Converts the string representation of a complex number to a single-precision complex number equivalent.
        /// A return value indicates whether the conversion succeeded or failed.
        /// </summary>
        /// <param name="value">
        /// A string containing a complex number to convert.
        /// </param>
        /// <param name="result">
        /// The parsed value.
        /// </param>
        /// <returns>
        /// If the conversion succeeds, the result will contain a complex number equivalent to value.
        /// Otherwise the result will contain complex32.Zero.  This parameter is passed uninitialized
        /// </returns>
        public static bool TryParse(string value, out Complex32 result)
        {
            return TryParse(value, null, out result);
        }

        /// <summary>
        /// Converts the string representation of a complex number to single-precision complex number equivalent.
        /// A return value indicates whether the conversion succeeded or failed.
        /// </summary>
        /// <param name="value">
        /// A string containing a complex number to convert.
        /// </param>
        /// <param name="formatProvider">
        /// An <see cref="IFormatProvider"/> that supplies culture-specific formatting information about value.
        /// </param>
        /// <param name="result">
        /// The parsed value.
        /// </param>
        /// <returns>
        /// If the conversion succeeds, the result will contain a complex number equivalent to value.
        /// Otherwise the result will contain complex32.Zero.  This parameter is passed uninitialized
        /// </returns>
        public static bool TryParse(string value, IFormatProvider formatProvider, out Complex32 result)
        {
            bool ret;
            try
            {
                result = Parse(value, formatProvider);
                ret = true;
            }
            catch (ArgumentNullException)
            {
                result = Zero;
                ret = false;
            }
            catch (FormatException)
            {
                result = Zero;
                ret = false;
            }

            return ret;
        }

        #endregion

        #region Conversion

        /// <summary>
        /// Explicit conversion of a real decimal to a <c>Complex32</c>.
        /// </summary>
        /// <param name="value">The decimal value to convert.</param>
        /// <returns>The result of the conversion.</returns>
        public static explicit operator Complex32(decimal value)
        {
            return new Complex32((float)value, 0.0f);
        }

        /// <summary>
        /// Explicit conversion of a <c>Complex</c> to a <c>Complex32</c>.
        /// </summary>
        /// <param name="value">The decimal value to convert.</param>
        /// <returns>The result of the conversion.</returns>
        public static explicit operator Complex32(Complex value)
        {
            return new Complex32((float)value.Real, (float)value.Imaginary);
        }

        /// <summary>
        /// Implicit conversion of a real byte to a <c>Complex32</c>.
        /// </summary>
        /// <param name="value">The byte value to convert.</param>
        /// <returns>The result of the conversion.</returns>
        public static implicit operator Complex32(byte value)
        {
            return new Complex32(value, 0.0f);
        }

        /// <summary>
        /// Implicit conversion of a real short to a <c>Complex32</c>.
        /// </summary>
        /// <param name="value">The short value to convert.</param>
        /// <returns>The result of the conversion.</returns>
        public static implicit operator Complex32(short value)
        {
            return new Complex32(value, 0.0f);
        }

        /// <summary>
        /// Implicit conversion of a signed byte to a <c>Complex32</c>.
        /// </summary>
        /// <param name="value">The signed byte value to convert.</param>
        /// <returns>The result of the conversion.</returns>
        [CLSCompliant(false)]
        public static implicit operator Complex32(sbyte value)
        {
            return new Complex32(value, 0.0f);
        }

        /// <summary>
        /// Implicit conversion of a unsigned real short to a <c>Complex32</c>.
        /// </summary>
        /// <param name="value">The unsigned short value to convert.</param>
        /// <returns>The result of the conversion.</returns>
        [CLSCompliant(false)]
        public static implicit operator Complex32(ushort value)
        {
            return new Complex32(value, 0.0f);
        }

        /// <summary>
        /// Implicit conversion of a real int to a <c>Complex32</c>.
        /// </summary>
        /// <param name="value">The int value to convert.</param>
        /// <returns>The result of the conversion.</returns>
        public static implicit operator Complex32(int value)
        {
            return new Complex32(value, 0.0f);
        }

        /// <summary>
        /// Implicit conversion of a BigInteger int to a <c>Complex32</c>.
        /// </summary>
        /// <param name="value">The BigInteger value to convert.</param>
        /// <returns>The result of the conversion.</returns>
        public static implicit operator Complex32(BigInteger value)
        {
            return new Complex32((long)value, 0.0f);
        }

        /// <summary>
        /// Implicit conversion of a real long to a <c>Complex32</c>.
        /// </summary>
        /// <param name="value">The long value to convert.</param>
        /// <returns>The result of the conversion.</returns>
        public static implicit operator Complex32(long value)
        {
            return new Complex32(value, 0.0f);
        }

        /// <summary>
        /// Implicit conversion of a real uint to a <c>Complex32</c>.
        /// </summary>
        /// <param name="value">The uint value to convert.</param>
        /// <returns>The result of the conversion.</returns>
        [CLSCompliant(false)]
        public static implicit operator Complex32(uint value)
        {
            return new Complex32(value, 0.0f);
        }

        /// <summary>
        /// Implicit conversion of a real ulong to a <c>Complex32</c>.
        /// </summary>
        /// <param name="value">The ulong value to convert.</param>
        /// <returns>The result of the conversion.</returns>
        [CLSCompliant(false)]
        public static implicit operator Complex32(ulong value)
        {
            return new Complex32(value, 0.0f);
        }

        /// <summary>
        /// Implicit conversion of a real float to a <c>Complex32</c>.
        /// </summary>
        /// <param name="value">The float value to convert.</param>
        /// <returns>The result of the conversion.</returns>
        public static implicit operator Complex32(float value)
        {
            return new Complex32(value, 0.0f);
        }

        /// <summary>
        /// Implicit conversion of a real double to a <c>Complex32</c>.
        /// </summary>
        /// <param name="value">The double value to convert.</param>
        /// <returns>The result of the conversion.</returns>
        public static explicit operator Complex32(double value)
        {
            return new Complex32((float)value, 0.0f);
        }

        /// <summary>
        /// Converts this <c>Complex32</c> to a <see cref="Complex"/>.
        /// </summary>
        /// <returns>A <see cref="Complex"/> with the same values as this <c>Complex32</c>.</returns>
        public Complex ToComplex()
        {
            return new Complex(_real, _imag);
        }

        #endregion

        /// <summary>
        /// Returns the additive inverse of a specified complex number.
        /// </summary>
        /// <returns>The result of the real and imaginary components of the value parameter multiplied by -1.</returns>
        /// <param name="value">A complex number.</param>
        [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
        public static Complex32 Negate(Complex32 value)
        {
            return -value;
        }

        /// <summary>
        /// Computes the conjugate of a complex number and returns the result.
        /// </summary>
        /// <returns>The conjugate of <paramref name="value" />.</returns>
        /// <param name="value">A complex number.</param>
        [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
        public static Complex32 Conjugate(Complex32 value)
        {
            return value.Conjugate();
        }

        /// <summary>
        /// Adds two complex numbers and returns the result.
        /// </summary>
        /// <returns>The sum of <paramref name="left" /> and <paramref name="right" />.</returns>
        /// <param name="left">The first complex number to add.</param>
        /// <param name="right">The second complex number to add.</param>
        [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
        public static Complex32 Add(Complex32 left, Complex32 right)
        {
            return left + right;
        }

        /// <summary>
        /// Subtracts one complex number from another and returns the result.
        /// </summary>
        /// <returns>The result of subtracting <paramref name="right" /> from <paramref name="left" />.</returns>
        /// <param name="left">The value to subtract from (the minuend).</param>
        /// <param name="right">The value to subtract (the subtrahend).</param>
        [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
        public static Complex32 Subtract(Complex32 left, Complex32 right)
        {
            return left - right;
        }

        /// <summary>
        /// Returns the product of two complex numbers.
        /// </summary>
        /// <returns>The product of the <paramref name="left" /> and <paramref name="right" /> parameters.</returns>
        /// <param name="left">The first complex number to multiply.</param>
        /// <param name="right">The second complex number to multiply.</param>
        [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
        public static Complex32 Multiply(Complex32 left, Complex32 right)
        {
            return left * right;
        }

        /// <summary>
        /// Divides one complex number by another and returns the result.
        /// </summary>
        /// <returns>The quotient of the division.</returns>
        /// <param name="dividend">The complex number to be divided.</param>
        /// <param name="divisor">The complex number to divide by.</param>
        [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
        public static Complex32 Divide(Complex32 dividend, Complex32 divisor)
        {
            return dividend / divisor;
        }
        /// <summary>
        /// Returns the multiplicative inverse of a complex number.
        /// </summary>
        /// <returns>The reciprocal of <paramref name="value" />.</returns>
        /// <param name="value">A complex number.</param>
        [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
        public static Complex32 Reciprocal(Complex32 value)
        {
            return value.Reciprocal();
        }

        /// <summary>
        /// Returns the square root of a specified complex number.
        /// </summary>
        /// <returns>The square root of <paramref name="value" />.</returns>
        /// <param name="value">A complex number.</param>
        [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
        public static Complex32 Sqrt(Complex32 value)
        {
            return value.SquareRoot();
        }

        /// <summary>
        /// Gets the absolute value (or magnitude) of a complex number.
        /// </summary>
        /// <returns>The absolute value of <paramref name="value" />.</returns>
        /// <param name="value">A complex number.</param>
        [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
        public static double Abs(Complex32 value)
        {
            return value.Magnitude;
        }

        /// <summary>
        /// Returns e raised to the power specified by a complex number.
        /// </summary>
        /// <returns>The number e raised to the power <paramref name="value" />.</returns>
        /// <param name="value">A complex number that specifies a power.</param>
        [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
        public static Complex32 Exp(Complex32 value)
        {
            return value.Exponential();
        }

        /// <summary>
        /// Returns a specified complex number raised to a power specified by a complex number.
        /// </summary>
        /// <returns>The complex number <paramref name="value" /> raised to the power <paramref name="power" />.</returns>
        /// <param name="value">A complex number to be raised to a power.</param>
        /// <param name="power">A complex number that specifies a power.</param>
        [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
        public static Complex32 Pow(Complex32 value, Complex32 power)
        {
            return value.Power(power);
        }

        /// <summary>
        /// Returns a specified complex number raised to a power specified by a single-precision floating-point number.
        /// </summary>
        /// <returns>The complex number <paramref name="value" /> raised to the power <paramref name="power" />.</returns>
        /// <param name="value">A complex number to be raised to a power.</param>
        /// <param name="power">A single-precision floating-point number that specifies a power.</param>
        [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
        public static Complex32 Pow(Complex32 value, float power)
        {
            return value.Power(power);
        }

        /// <summary>
        /// Returns the natural (base e) logarithm of a specified complex number.
        /// </summary>
        /// <returns>The natural (base e) logarithm of <paramref name="value" />.</returns>
        /// <param name="value">A complex number.</param>
        [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
        public static Complex32 Log(Complex32 value)
        {
            return value.NaturalLogarithm();
        }

        /// <summary>
        /// Returns the logarithm of a specified complex number in a specified base.
        /// </summary>
        /// <returns>The logarithm of <paramref name="value" /> in base <paramref name="baseValue" />.</returns>
        /// <param name="value">A complex number.</param>
        /// <param name="baseValue">The base of the logarithm.</param>
        [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
        public static Complex32 Log(Complex32 value, float baseValue)
        {
            return value.Logarithm(baseValue);
        }

        /// <summary>
        /// Returns the base-10 logarithm of a specified complex number.
        /// </summary>
        /// <returns>The base-10 logarithm of <paramref name="value" />.</returns>
        /// <param name="value">A complex number.</param>
        [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
        public static Complex32 Log10(Complex32 value)
        {
            return value.CommonLogarithm();
        }

        /// <summary>
        /// Returns the sine of the specified complex number.
        /// </summary>
        /// <returns>The sine of <paramref name="value" />.</returns>
        /// <param name="value">A complex number.</param>
        public static Complex32 Sin(Complex32 value)
        {
            return (Complex32)Trig.Sin(value.ToComplex());
        }

        /// <summary>
        /// Returns the cosine of the specified complex number.
        /// </summary>
        /// <returns>The cosine of <paramref name="value" />.</returns>
        /// <param name="value">A complex number.</param>
        public static Complex32 Cos(Complex32 value)
        {
            return (Complex32)Trig.Cos(value.ToComplex());
        }

        /// <summary>
        /// Returns the tangent of the specified complex number.
        /// </summary>
        /// <returns>The tangent of <paramref name="value" />.</returns>
        /// <param name="value">A complex number.</param>
        public static Complex32 Tan(Complex32 value)
        {
            return (Complex32)Trig.Tan(value.ToComplex());
        }

        /// <summary>
        /// Returns the angle that is the arc sine of the specified complex number.
        /// </summary>
        /// <returns>The angle which is the arc sine of <paramref name="value" />.</returns>
        /// <param name="value">A complex number.</param>
        public static Complex32 Asin(Complex32 value)
        {
            return (Complex32)Trig.Asin(value.ToComplex());
        }

        /// <summary>
        /// Returns the angle that is the arc cosine of the specified complex number.
        /// </summary>
        /// <returns>The angle, measured in radians, which is the arc cosine of <paramref name="value" />.</returns>
        /// <param name="value">A complex number that represents a cosine.</param>
        public static Complex32 Acos(Complex32 value)
        {
            return (Complex32)Trig.Acos(value.ToComplex());
        }

        /// <summary>
        /// Returns the angle that is the arc tangent of the specified complex number.
        /// </summary>
        /// <returns>The angle that is the arc tangent of <paramref name="value" />.</returns>
        /// <param name="value">A complex number.</param>
        public static Complex32 Atan(Complex32 value)
        {
            return (Complex32)Trig.Atan(value.ToComplex());
        }

        /// <summary>
        /// Returns the hyperbolic sine of the specified complex number.
        /// </summary>
        /// <returns>The hyperbolic sine of <paramref name="value" />.</returns>
        /// <param name="value">A complex number.</param>
        public static Complex32 Sinh(Complex32 value)
        {
            return (Complex32)Trig.Sinh(value.ToComplex());
        }

        /// <summary>
        /// Returns the hyperbolic cosine of the specified complex number.
        /// </summary>
        /// <returns>The hyperbolic cosine of <paramref name="value" />.</returns>
        /// <param name="value">A complex number.</param>
        public static Complex32 Cosh(Complex32 value)
        {
            return (Complex32)Trig.Cosh(value.ToComplex());
        }

        /// <summary>
        /// Returns the hyperbolic tangent of the specified complex number.
        /// </summary>
        /// <returns>The hyperbolic tangent of <paramref name="value" />.</returns>
        /// <param name="value">A complex number.</param>
        public static Complex32 Tanh(Complex32 value)
        {
            return (Complex32)Trig.Tanh(value.ToComplex());
        }
    }
}