using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace OOP_example
{

    class Student
    {
        private string firstName; // fields , pazqt vremennite danni za class-a
        private string lastName;  // Access modifiers = private , za da mogat da se dostupvat samo ot tozi class
        private string fullName;
        readonly string number; // readOnly , za da moje ID nomera da se suzdava unikalen pri suzdavaneto na obekt ot constr i da ne se promenq

        public Student()  // constructor -- ako suzdadem student bez vhodni parametri
        {
            fullName = "<Anonymous>";
            number = Guid.NewGuid().ToString(); // davam unikalen nomer ID za vseki nov student
        }
        public Student(string firstName, string lastName) // constructor -- ako ima FN i LN
        {
            if (firstName.Length < 3 || firstName == null || firstName.Length > 15) // validation
            {
                throw new ArgumentException("Please, enter valid first name! (between 3 and 15 symbols ) ");
            }
            if (lastName.Length < 3 || lastName == null || lastName.Length > 15)
            {
                throw new ArgumentException("Please, enter valid last name! (between 3 and 15 symbols ) ");
            }

            fullName = firstName + " " + lastName;
            number = Guid.NewGuid().ToString();
        }

        public string FirstName  // Property za FName --> tuk pravq validaciq za da setna stoinost , ima getter za da moje da se polzva stoinostta
        {
            get
            {
                return this.firstName;
            }
            set
            {
                if (value.Length < 3 || value == null || value.Length > 15)
                {
                    throw new ArgumentException("Please, enter valid first name! (between 3 and 15 symbols ) ");
                }
                else
                {
                    this.firstName = value;
                }
            }
        }
        public string LastName // prop za last name , validation
        {
            get
            {
                return this.lastName;
            }
            set
            {
                if (value.Length < 3 || value == null || value.Length > 15)
                {
                    throw new ArgumentException("Please, enter valid last name! (between 3 and 15 symbols ) ");
                }
                else
                {
                    this.lastName = value;
                }
            }
        }
        public string FullName
        {
            get
            {
                return this.fullName;
            }
            set
            {
                if (value.Length < 3 || value == null || value.Length > 30)
                {
                    throw new ArgumentException("Please, enter valid Full name! (between 3 and 15 symbols ) ");
                }

                else
                {
                    fullName = value;
                }

            }
        } // Ne e nujna validaciq , tui kato sum checknal first i last name po otdelno


        public void GoToExam()    // method
        {
            if (firstName != null && lastName != null) // imam IF ako purvona4alno obekta e suzdaden bez parametri, no v posledstvie
                                                       // e populnil first i last name , PODOZIRAM che ima po inteligenten na4in !
            {
                fullName = firstName + " " + lastName;
            }
            Console.WriteLine(@"The student {0} with student's ID = ""{1}"" go to SoftSkills exam", fullName, number);
        }
    }


    class Program
    {
        static void Main(string[] args)
        {
            // obekt bez parametri, v posledstvie zadavame stoinost na property-to FullName, trqbva da mine validaciq
            Student Ivan = new Student();
            Ivan.FullName = "Stoyan Rusev";
            Ivan.GoToExam();
            Console.WriteLine();

            // obekt sus 2 vhodni parametera FN i LN , vseki trqbva da mine validaciq
            Student T = new Student("Todor", "Karamfilov");
            T.GoToExam();
            Console.WriteLine();

            // obekt s prazen konstruktor, na koito v posledstvie zadavam stoinost na FN i LN
            var student3 = new Student();
            student3.FirstName = "Dimitar";
            student3.LastName = "Petrov";
            student3.GoToExam();
            Console.WriteLine();

            // otnovo prazen ctor, v posledstvie zadavame samo FN.
            var student4 = new Student(); // v tozi slu4ai studenta trqbva da e Unknown tui kato e dal samo first name
            student4.FirstName = "Rosen";
            student4.GoToExam();
            Console.WriteLine();

            //// Exeption :
            //var exeption = new Student("TTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTT", "");

            //// Exeption2 :
            //var exeption2 = new Student();
            //exeption2.FirstName = "";

            //// Exeption3 :
            //var exeption3 = new Student();
            //exeption3.LastName = "ssssssssssssssssssssssssssssssssssssssssssssssssssss";
        }
    }
}