using System;

using System.Text;

​

public static class FieldLength

{

    public static  int FirstName {get;  set;} = 15;

    public static int LastName {get; set;} = 15;

}

​

enum LengthStatus

        {

            BOTH_OK,

            BOTH_TOO_LONG,

            FirstName_TOO_LONG,

            LastName_TOO_LONG,

        }

​

public class Program

{

    public static void Main()

    {

        string imie = "andrzejus waldemar bąk";

        string nazw = null;

        //var aa= SqueezeFirstAndLastName(imie, nazw);

        var bb = SplitByFullWordsIntoFirstAndLastName(imie);

        Console.WriteLine(bb.firstNameSqueezed);

        Console.WriteLine(bb.lastNameSqueezed);

    }

     public static (string firstNameSqueezed, string lastNameSqueezed) SqueezeFirstAndLastName(string firstName, string lastName)

        {

            if (firstName == null && lastName == null)

            {

                return (null, null);

            }

            if (firstName == null)

            {

                firstName = string.Empty;

            }

            if (lastName == null)

            {

                lastName = string.Empty;

            }

            LengthStatus status = SetLengthStatus(firstName, lastName);

            Console.WriteLine(status.ToString());

​

            switch (status)

            {

                case LengthStatus.BOTH_OK:

                    return (firstName, lastName);

​

                case LengthStatus.FirstName_TOO_LONG:

                    {

                        int toCopy = FieldLength.LastName - lastName.Length - 1;

                        Console.WriteLine($"toCopy {toCopy}");

                        int toCut = firstName.Length - FieldLength.FirstName > toCopy ? toCopy : firstName.Length - FieldLength.FirstName;

                        Console.WriteLine($"toCut {toCut}");

                        string firstNamePart = firstName.Substring(FieldLength.FirstName, toCut );

                        Console.WriteLine($"firstNamePart {firstNamePart}");

​

                        string resultLastName = $"{firstNamePart} {lastName}";

                        string resultFirstName = firstName.Substring(0, FieldLength.FirstName);

​

                        return (resultFirstName, resultLastName);

                    }

​

                case LengthStatus.LastName_TOO_LONG:

                    {

                        int toCopy = FieldLength.FirstName - firstName.Length - 1;

                        string lastNamePart = lastName.Substring(0, toCopy);

​

                        string resultFirstName = $"{firstName} {lastNamePart}";

​

                        int toCut = lastName.Length - toCopy > FieldLength.LastName ? FieldLength.LastName : lastName.Length - toCopy;

                        string resultLastName = lastName.Substring(lastNamePart.Length, toCut);

​

                        return (resultFirstName, resultLastName);

                    }

​

                case LengthStatus.BOTH_TOO_LONG:

                default:

                    return (firstName.Substring(0,FieldLength.FirstName), lastName.Substring(0,FieldLength.LastName));

            }

        }

    public static (string firstNameSqueezed, string lastNameSqueezed) SplitIntoFirstAndLastName(string input)

        {

            if (input.Length <= FieldLength.FirstName)

            {

                return (input, string.Empty);

            }

            else

            {

                string firstPart = input.Substring(0, FieldLength.FirstName);

                Console.WriteLine($"firstPart {firstPart}");

                int toCut = input.Length - firstPart.Length >= FieldLength.LastName ? FieldLength.FirstName : input.Length - firstPart.Length;

                Console.WriteLine($"toCut {toCut}");

                string secoundPart = input.Substring(FieldLength.FirstName, toCut);

​

                return (firstPart, secoundPart);

            }

        }

    public static (string firstNameSqueezed, string lastNameSqueezed) SplitByFullWordsIntoFirstAndLastName(string input)

        {

            if (input == null)

            {

                return (null, null);

            }

​

            if (input.Length <= FieldLength.FirstName)

            {

                return (input, string.Empty);

            }

            else

            {

                string[] words = input.Split(' ');

​

​

                StringBuilder first = new StringBuilder();

                StringBuilder last = new StringBuilder();

                    Console.WriteLine(first);

                bool firstNameFull = false;

                foreach (var word in words)

                {

                    if (word.Length <= FieldLength.FirstName - first.Length && !firstNameFull)

                    {

                        first.Append(word);

                        if (first.Length <= FieldLength.FirstName - 1)

                        {

                            first.Append(" ");

                        }

                    }

                    else

                    {

                        firstNameFull = true;

                        last.Append(word);

                        if (last.Length <= FieldLength.LastName - 1)

                        {

                            last.Append(" ");

                        }

                    }

                }

                return (first.ToString(), last.ToString().Substring(0, last.Length >= FieldLength.LastName ? FieldLength.LastName : last.Length));

​

                //string firstPart = input.Truncate(FieldLength.FirstName);

                //int toCut = input.Length - firstPart.Length >= FieldLength.LastName ? FieldLength.FirstName : input.Length - firstPart.Length;

                //string secoundPart = input.Substring(FieldLength.FirstName, toCut);

​

                //return (firstPart, secoundPart);

            }

        }

    private static LengthStatus SetLengthStatus(string firstName, string lastName)

        {

            if (firstName.Length <= FieldLength.FirstName && lastName.Length <= FieldLength.LastName)

            {

                return LengthStatus.BOTH_OK;

            }

​

            if ((firstName.Length > FieldLength.FirstName && lastName.Length >= FieldLength.LastName) ||

                (firstName.Length >= FieldLength.FirstName && lastName.Length > FieldLength.LastName))

            {

                return LengthStatus.BOTH_TOO_LONG;

            }

​

            if (firstName.Length > FieldLength.FirstName)

            {

                return LengthStatus.FirstName_TOO_LONG;

            }

            else

            {

                return LengthStatus.LastName_TOO_LONG;

            }

        }

}