using System;
using System.Runtime.Serialization;
using System.Text.RegularExpressions;

namespace AForge.Math;

public struct Complex : ICloneable, ISerializable
{
	public double Re;

	public double Im;

	public static readonly Complex Zero = new Complex(0.0, 0.0);

	public static readonly Complex One = new Complex(1.0, 0.0);

	public static readonly Complex I = new Complex(0.0, 1.0);

	public double Magnitude => System.Math.Sqrt(Re * Re + Im * Im);

	public double Phase => System.Math.Atan2(Im, Re);

	public double SquaredMagnitude => Re * Re + Im * Im;

	public Complex(double re, double im)
	{
		Re = re;
		Im = im;
	}

	public Complex(Complex c)
	{
		Re = c.Re;
		Im = c.Im;
	}

	public static Complex Add(Complex a, Complex b)
	{
		return new Complex(a.Re + b.Re, a.Im + b.Im);
	}

	public static Complex Add(Complex a, double s)
	{
		return new Complex(a.Re + s, a.Im);
	}

	public static void Add(Complex a, Complex b, ref Complex result)
	{
		result.Re = a.Re + b.Re;
		result.Im = a.Im + b.Im;
	}

	public static void Add(Complex a, double s, ref Complex result)
	{
		result.Re = a.Re + s;
		result.Im = a.Im;
	}

	public static Complex Subtract(Complex a, Complex b)
	{
		return new Complex(a.Re - b.Re, a.Im - b.Im);
	}

	public static Complex Subtract(Complex a, double s)
	{
		return new Complex(a.Re - s, a.Im);
	}

	public static Complex Subtract(double s, Complex a)
	{
		return new Complex(s - a.Re, a.Im);
	}

	public static void Subtract(Complex a, Complex b, ref Complex result)
	{
		result.Re = a.Re - b.Re;
		result.Im = a.Im - b.Im;
	}

	public static void Subtract(Complex a, double s, ref Complex result)
	{
		result.Re = a.Re - s;
		result.Im = a.Im;
	}

	public static void Subtract(double s, Complex a, ref Complex result)
	{
		result.Re = s - a.Re;
		result.Im = a.Im;
	}

	public static Complex Multiply(Complex a, Complex b)
	{
		double re = a.Re;
		double im = a.Im;
		double re2 = b.Re;
		double im2 = b.Im;
		return new Complex(re * re2 - im * im2, re * im2 + im * re2);
	}

	public static Complex Multiply(Complex a, double s)
	{
		return new Complex(a.Re * s, a.Im * s);
	}

	public static void Multiply(Complex a, Complex b, ref Complex result)
	{
		double re = a.Re;
		double im = a.Im;
		double re2 = b.Re;
		double im2 = b.Im;
		result.Re = re * re2 - im * im2;
		result.Im = re * im2 + im * re2;
	}

	public static void Multiply(Complex a, double s, ref Complex result)
	{
		result.Re = a.Re * s;
		result.Im = a.Im * s;
	}

	public static Complex Divide(Complex a, Complex b)
	{
		double re = a.Re;
		double im = a.Im;
		double re2 = b.Re;
		double im2 = b.Im;
		double num = re2 * re2 + im2 * im2;
		if (num == 0.0)
		{
			throw new DivideByZeroException("Can not divide by zero.");
		}
		double num2 = 1.0 / num;
		return new Complex((re * re2 + im * im2) * num2, (im * re2 - re * im2) * num2);
	}

	public static Complex Divide(Complex a, double s)
	{
		if (s == 0.0)
		{
			throw new DivideByZeroException("Can not divide by zero.");
		}
		return new Complex(a.Re / s, a.Im / s);
	}

	public static Complex Divide(double s, Complex a)
	{
		if (a.Re == 0.0 || a.Im == 0.0)
		{
			throw new DivideByZeroException("Can not divide by zero.");
		}
		return new Complex(s / a.Re, s / a.Im);
	}

	public static void Divide(Complex a, Complex b, ref Complex result)
	{
		double re = a.Re;
		double im = a.Im;
		double re2 = b.Re;
		double im2 = b.Im;
		double num = re2 * re2 + im2 * im2;
		if (num == 0.0)
		{
			throw new DivideByZeroException("Can not divide by zero.");
		}
		double num2 = 1.0 / num;
		result.Re = (re * re2 + im * im2) * num2;
		result.Im = (im * re2 - re * im2) * num2;
	}

	public static void Divide(Complex a, double s, ref Complex result)
	{
		if (s == 0.0)
		{
			throw new DivideByZeroException("Can not divide by zero.");
		}
		result.Re = a.Re / s;
		result.Im = a.Im / s;
	}

	public static void Divide(double s, Complex a, ref Complex result)
	{
		if (a.Re == 0.0 || a.Im == 0.0)
		{
			throw new DivideByZeroException("Can not divide by zero.");
		}
		result.Re = s / a.Re;
		result.Im = s / a.Im;
	}

	public static Complex Negate(Complex a)
	{
		return new Complex(0.0 - a.Re, 0.0 - a.Im);
	}

	public static bool ApproxEqual(Complex a, Complex b)
	{
		return ApproxEqual(a, b, 8.881784197001252E-16);
	}

	public static bool ApproxEqual(Complex a, Complex b, double tolerance)
	{
		if (System.Math.Abs(a.Re - b.Re) <= tolerance)
		{
			return System.Math.Abs(a.Im - b.Im) <= tolerance;
		}
		return false;
	}

	public static Complex Parse(string s)
	{
		Regex regex = new Regex("\\((?<real>.*),(?<imaginary>.*)\\)", RegexOptions.None);
		Match match = regex.Match(s);
		if (match.Success)
		{
			return new Complex(double.Parse(match.Result("${real}")), double.Parse(match.Result("${imaginary}")));
		}
		throw new FormatException("String representation of the complex number is not correctly formatted.");
	}

	public static bool TryParse(string s, out Complex result)
	{
		try
		{
			Complex complex = Parse(s);
			result = complex;
			return true;
		}
		catch (FormatException)
		{
			result = default(Complex);
			return false;
		}
	}

	public static Complex Sqrt(Complex a)
	{
		Complex zero = Zero;
		if (a.Re == 0.0 && a.Im == 0.0)
		{
			return zero;
		}
		if (a.Im == 0.0)
		{
			zero.Re = ((a.Re > 0.0) ? System.Math.Sqrt(a.Re) : System.Math.Sqrt(0.0 - a.Re));
			zero.Im = 0.0;
		}
		else
		{
			double magnitude = a.Magnitude;
			zero.Re = System.Math.Sqrt(0.5 * (magnitude + a.Re));
			zero.Im = System.Math.Sqrt(0.5 * (magnitude - a.Re));
			if (a.Im < 0.0)
			{
				zero.Im = 0.0 - zero.Im;
			}
		}
		return zero;
	}

	public static Complex Log(Complex a)
	{
		Complex zero = Zero;
		if (a.Re > 0.0 && a.Im == 0.0)
		{
			zero.Re = System.Math.Log(a.Re);
			zero.Im = 0.0;
		}
		else if (a.Re == 0.0)
		{
			if (a.Im > 0.0)
			{
				zero.Re = System.Math.Log(a.Im);
				zero.Im = System.Math.PI / 2.0;
			}
			else
			{
				zero.Re = System.Math.Log(0.0 - a.Im);
				zero.Im = -System.Math.PI / 2.0;
			}
		}
		else
		{
			zero.Re = System.Math.Log(a.Magnitude);
			zero.Im = System.Math.Atan2(a.Im, a.Re);
		}
		return zero;
	}

	public static Complex Exp(Complex a)
	{
		Complex zero = Zero;
		double num = System.Math.Exp(a.Re);
		zero.Re = num * System.Math.Cos(a.Im);
		zero.Im = num * System.Math.Sin(a.Im);
		return zero;
	}

	public static Complex Sin(Complex a)
	{
		Complex zero = Zero;
		if (a.Im == 0.0)
		{
			zero.Re = System.Math.Sin(a.Re);
			zero.Im = 0.0;
		}
		else
		{
			zero.Re = System.Math.Sin(a.Re) * System.Math.Cosh(a.Im);
			zero.Im = System.Math.Cos(a.Re) * System.Math.Sinh(a.Im);
		}
		return zero;
	}

	public static Complex Cos(Complex a)
	{
		Complex zero = Zero;
		if (a.Im == 0.0)
		{
			zero.Re = System.Math.Cos(a.Re);
			zero.Im = 0.0;
		}
		else
		{
			zero.Re = System.Math.Cos(a.Re) * System.Math.Cosh(a.Im);
			zero.Im = (0.0 - System.Math.Sin(a.Re)) * System.Math.Sinh(a.Im);
		}
		return zero;
	}

	public static Complex Tan(Complex a)
	{
		Complex zero = Zero;
		if (a.Im == 0.0)
		{
			zero.Re = System.Math.Tan(a.Re);
			zero.Im = 0.0;
		}
		else
		{
			double num = 2.0 * a.Re;
			double value = 2.0 * a.Im;
			double num2 = System.Math.Cos(num) + System.Math.Cosh(num);
			zero.Re = System.Math.Sin(num) / num2;
			zero.Im = System.Math.Sinh(value) / num2;
		}
		return zero;
	}

	public override int GetHashCode()
	{
		return Re.GetHashCode() ^ Im.GetHashCode();
	}

	public override bool Equals(object obj)
	{
		if (!(obj is Complex))
		{
			return false;
		}
		return this == (Complex)obj;
	}

	public override string ToString()
	{
		return $"({Re}, {Im})";
	}

	public static bool operator ==(Complex u, Complex v)
	{
		if (u.Re == v.Re)
		{
			return u.Im == v.Im;
		}
		return false;
	}

	public static bool operator !=(Complex u, Complex v)
	{
		return !(u == v);
	}

	public static Complex operator -(Complex a)
	{
		return Negate(a);
	}

	public static Complex operator +(Complex a, Complex b)
	{
		return Add(a, b);
	}

	public static Complex operator +(Complex a, double s)
	{
		return Add(a, s);
	}

	public static Complex operator +(double s, Complex a)
	{
		return Add(a, s);
	}

	public static Complex operator -(Complex a, Complex b)
	{
		return Subtract(a, b);
	}

	public static Complex operator -(Complex a, double s)
	{
		return Subtract(a, s);
	}

	public static Complex operator -(double s, Complex a)
	{
		return Subtract(s, a);
	}

	public static Complex operator *(Complex a, Complex b)
	{
		return Multiply(a, b);
	}

	public static Complex operator *(double s, Complex a)
	{
		return Multiply(a, s);
	}

	public static Complex operator *(Complex a, double s)
	{
		return Multiply(a, s);
	}

	public static Complex operator /(Complex a, Complex b)
	{
		return Divide(a, b);
	}

	public static Complex operator /(Complex a, double s)
	{
		return Divide(a, s);
	}

	public static Complex operator /(double s, Complex a)
	{
		return Divide(s, a);
	}

	public static explicit operator Complex(float value)
	{
		return new Complex(value, 0.0);
	}

	public static explicit operator Complex(double value)
	{
		return new Complex(value, 0.0);
	}

	object ICloneable.Clone()
	{
		return new Complex(this);
	}

	public Complex Clone()
	{
		return new Complex(this);
	}

	public void GetObjectData(SerializationInfo info, StreamingContext context)
	{
		info.AddValue("Real", Re);
		info.AddValue("Imaginary", Im);
	}
}