message

namespace _06.Messages
{
    using System;
    using System.Collections.Generic;
    using System.Linq;

    public class User
    {
        public string Name { get; set; }

        public List<Message> ReceivedMessages { get; set; }
    }

    public class Message
    {
        public string Content { get; set; }

        public string Sender { get; set; }
    }

    public class Messages
    {
        public static void Main()
        {

            // 60/100 judge

            List<User> registeredUsers = new List<User>();
            List<Message> registeretdMeseges = new List<Message>();

            string[] input = Console.ReadLine()
                .Split(new char[] { ' ' },
                StringSplitOptions.RemoveEmptyEntries);


            while (input[0] != "exit")
            {
                #region Register the usersrs and take the messeges
                if (input[0] == "register")
                {
                    User newUser = new User()
                    {
                        Name = input[1],
                        ReceivedMessages = new List<Message>()
                    };
                    registeredUsers.Add(newUser);
                }
                else
                {
                    //Chek did we have the recipient for the messeges
                    for (int i = 0; i < registeredUsers.Count; i++)
                    {
                        if (registeredUsers[i].Name.Contains(input[2]))
                        {
                            Message newMessage = new Message()
                            {
                                Sender = input[0],

                                Content = input[3]
                            };
                            registeretdMeseges.Add(newMessage);
                        }
                    }
                }
                #endregion

                input = Console.ReadLine()
                .Split(new char[] { ' ' },
                StringSplitOptions.RemoveEmptyEntries);
            }
            #region Add the sender and the message
            //Add the Sender and the message send to the registeredUser.ReceivedMessages
            foreach (var user in registeredUsers)
            {
                foreach (var msg in registeretdMeseges)
                {
                    if (user.Name.Contains(msg.Sender))
                    {
                        user.ReceivedMessages.Add(msg);
                    }
                }
            }
            #endregion

            input = Console.ReadLine()
               .Split(new char[] { ' ' },
               StringSplitOptions.RemoveEmptyEntries);

            string firstUserName = input[0];
            string secondUserName = input[1];

            //List<string> names = new List<string>();

            //bool areUsersRegistered = false;

            //#region Get the registeret name and find if we have machest with the input
            ////Get all names that we have in list
            //foreach (var user in registeredUsers)
            //{
            //    names.Add(user.Name);
            //}

            ////if (input.Length >= 1)
            ////{
            //    //Chek if we have the name to start the chat
            //    if (names.Contains(firstUserName) && names.Contains(secondUserName))
            //    {
            //        areUsersRegistered = true;
            //    }
            //}

            //#endregion



            //if (areUsersRegistered)
            //{

            //    //Find if there are messeges between the both of them
            //    bool haveMeseges = false;

            //    if (registeredUsers.Find(u => u.Name == firstUserName)
            //        .ReceivedMessages.Count() > 0 &&
            //        registeredUsers.Find(u => u.Name == secondUserName)
            //        .ReceivedMessages.Count() > 0)
            //    {
            //        haveMeseges = true;
            //    }

                //if (haveMeseges)
                //{


                    List<Message> nameOneChat = registeredUsers
                        .Find(u => u.Name == firstUserName)
                        .ReceivedMessages
                        .Where(m => m.Sender == firstUserName)
                        .ToList();
                    List<Message> nameTwoChat = registeredUsers
                        .Find(u => u.Name == secondUserName)
                        .ReceivedMessages
                        .Where(m => m.Sender == secondUserName)
                        .ToList();

            if (nameOneChat.Count == 0 && nameTwoChat.Count == 0)
            {
                Console.WriteLine("No messages"); return;
            }


            ////Get the chat in separeted lists
            //foreach (var person in registeredUsers)
            //{
            //    if(person.Name == firstUserName)
            //    {
            //        nameOneChat = person.ReceivedMessages;
            //    }

            //    if(person.Name == secondUserName)
            //    {
            //        nameTwoChat = person.ReceivedMessages;
            //    }
            //}

            ////Get the max lenght and print all messeges in order
            int lenghtOfTheChat = Math.Max(nameOneChat.Count, nameTwoChat.Count);

                    for (int i = 0; i < lenghtOfTheChat; i++)
                    {
                        if (i < nameOneChat.Count)
                        {
                            Console.WriteLine($"{firstUserName}: {nameOneChat[i].Content}");
                        }
                        if (i < nameTwoChat.Count)
                        {
                            Console.WriteLine($"{nameTwoChat[i].Content} :{secondUserName}");
                        }
                    }

                //}
                //else
                //{
                //    Console.WriteLine("No messages");
                //}

            }
            //else
            //{
            //    return;
            //}
        }
    }