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

namespace pomosh_antony
{
    public class PhoneEventArgs : EventArgs
    {
        public int CallerNumber { get; set; }

        public PhoneEventArgs(int callerNumber)
        {
            CallerNumber = callerNumber;
        }
    }

    public delegate void PhoneEventHandler(object sender, PhoneEventArgs args);

    class Phone
    {
        private Dictionary<int, Phone> phones = new Dictionary<int, Phone>();
        public event PhoneEventHandler OnCall;
        public int Number { get; private set; }

        public Phone(int number)
        {
            Number = number;
        }


        public void AddPhoneToBook(Phone phone)
        {
            if (phones.ContainsKey(phone.Number))
            {
                Console.WriteLine($"Number {phone} have already existed.");
                return;
            }

            phones.Add(phone.Number, phone);
        }

        public bool Call(int number)
        {
            if (phones.ContainsKey(number))
            {
                phones[number].OnCall.Invoke(this, new PhoneEventArgs(number));
                return true;
            }
            return false;
        }
    }



}