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

namespace ConsoleApplication35
{
        public class User
        {
            public string name;
            public string surname;
            public string country;
            public string sex;
            public int age;
            public string mail;
            public string login;
            public string password;
            public User(string name, string surname, string country, string sex, int age, string mail, string login, string password)
            {
                this.name = name;
                this.surname = surname;
                this.country = country;
                this.sex = sex;
                this.age = age;
                this.mail = mail;
                this.login = login;
                this.password = password;
            }
        List<User> m_userList;
        public void database()
        {
            m_userList = new List<User>();
        }
        public void Register(string name, string surname, string country, string sex, int age, string mail, string login, string password)
        {
            m_userList.Add(new User(name, surname, country, sex, age, mail, login, password));
        }

        public void listOfUser()
        {
            foreach (User i in m_userList)
            {
                Console.WriteLine(i.name + " " + i.surname + " " + i.country + " " + i.sex + " " + i.age + i.mail + " " + i.login + " " + i.password);
            }
        }
        public bool changePasswordByLogin(string login, string oldPassword, string newPassword)
        {
            User foundUser = findUserByLogin(login);
            if (foundUser == null)
            {
                return false;
            }
            if (!foundUser.checkPassword(oldPassword))
            {
                return false;
            }
            foundUser.password = newPassword;
            return true;
        }

        private User findUserByLogin(string login)
        {
            foreach (User user in m_userList)
            {
                if (user.login == login)
                {
                    return user;
                }
            }
            return null;
        }
        public bool checkPassword(string checkPassword)
        {

            return checkPassword == password;
        }


    }


    }
        public class server
        {
            public string name;
            public string ip;
            public string coutry;
            public List<string> Servers = new List<string>();

        }
    class Program
    {


        static void Main(string[] args)
        {
            User database = new User();
            database.Register("|Vlad|", "|Seleznev|", "|Ukraine|", "|Male|", 17, "|Seleznev@gmail.com|", "|Seleznev12|", "12345");
            database.Register("|Ruslan|", "|Molchanuk|", "|Ukraine|", "|Male|", 18, "|risegaming.com|", "rise12", "123456");
            database.Register("|Alexander|", "|Aprelenko|", "|Ukraine|", "|Male|", 17, "|qwerty.com|", "|apr12|", "1234567");

            Console.WriteLine("Enter you login");
            string login = Console.ReadLine();
            string oldPassword = Console.ReadLine();
            string newPassword = Console.ReadLine();
            if(!database.changePasswordByLogin(login, oldPassword, newPassword))
            {
                Console.WriteLine("Parol ne vernui");
            }
            //string name = Console.ReadLine();
            //database.register(name, .....)
            database.listOfUser();
            //changePassword();
        }
    }

}