class Contact
# add setters with validation
  attr_reader :phone, :telegram, :email

  def initialize(args = {})
    phone = args[:phone]
    telegram = args[:telegram]
    email = args[:email]

    raise ArgumentError, "Недопустимый номер телефона: #{phone}" if phone && !valid_phone_number?(phone)
    raise ArgumentError, "Некорректный Telegram: #{telegram}" if telegram && !valid_telegram?(telegram)
    raise ArgumentError, "Некорректный email: #{email}" if email && !valid_email?(email)
    raise ArgumentError, "Необходимо указать хотя бы один контакт (телефон, Telegram или email)" unless phone || telegram || email

    @phone = phone
    @telegram = telegram
    @email = email
  end

  def present?
    @phone || @telegram || @email
  end

  def get_single_contact
    return "Phone: #{@phone}" if @phone
    return "Telegram: #{@telegram}" if @telegram
    return "Email: #{@email}" if @email

    'No contact available'
  end

  def self.valid_phone_number?(phone)
    /\A\+?[0-9]{9,15}\z/.match?(phone)
  end

  def self.valid_telegram?(telegram)
    /\A@[A-Za-z0-9_]{5,32}\z/.match?(telegram)
  end

  def self.valid_email?(email)
    /\A[^@\s]+@[^@\s]+\.[^@\s]+\z/.match?(email)
  end

  def self.new_from_info(info_string)
    info_string = info_string.sub(/^Contact: /, '').strip

    case info_string
    when /\APhone: (.+)\z/i
      new(phone: Regexp.last_match(1).strip)
    when /\ATelegram: (.+)\z/i
      new(telegram: Regexp.last_match(1).strip)
    when /\AEmail: (.+)\z/i
      new(email: Regexp.last_match(1).strip)
    else
      raise ArgumentError, "Некорректный формат строки контакта: #{info_string}"
    end
  end
end