using System;
using System.Numerics;
using Z.Expressions;

namespace MathShit
{
    class Program
    {
        public static string FormatComplex(Complex num)
        {
            var res = "";
            var real = (int)Math.Round(num.Real);
            var im = (int)Math.Round(num.Imaginary);
            if (im == 0)
            {
                return real.ToString();
            }
            if (real == 0)
            {
                if (im == 1)
                {
                    return "i";
                }
                else if (im == -1)
                {
                    return "-i";
                }
                else
                {
                    return im.ToString() + "i";
                }
            }
            res += real;
            if (im == 1)
            {
                return res + "+i";
            }
            else if (im == -1)
            {
                return res + "-i";
            }
            else if (im > 0)
            {
                return res + "+" + im.ToString() + "i";
            }
            else
            {
                return res + im.ToString() + "i";
            }
        }
        public static string SolveMath(string expression)
        {
            expression.Replace("/", "//");
            while (expression.IndexOf('i') != -1)
            {
                var ind = expression.IndexOf('i');
                if (expression.IndexOf('i') > 0 && char.IsDigit(expression[expression.IndexOf('i') - 1]))
                {
                    expression = expression.Remove(ind, 1);
                    expression = expression.Insert(ind, "*(new Complex(0.0, 1.0))");
                }
                else
                {
                    expression = expression.Remove(ind, 1);
                    expression = expression.Insert(ind, "(new Complex(0.0, 1.0))");
                }
            }
            Console.WriteLine(expression);
            var context = new EvalContext();
            var c = new Complex(0, 0);
            context.RegisterType(c.GetType());

            var res = context.Execute(expression);
            if (expression.IndexOf('m') > 0)
                return (FormatComplex((Complex)res));
            return (res.ToString());
        }
    }
}