module Nickserver
  class Nickname

    EmailAddress = begin
                     qtext = '[^\\x0d\\x22\\x5c\\x80-\\xff]'
                     dtext = '[^\\x0d\\x5b-\\x5d\\x80-\\xff]'
                     atom = '[^\\x00-\\x20\\x22\\x28\\x29\\x2c\\x2e\\x3a-\\x3c\\x3e\\x40\\x5b-\\x5d\\x7f-\\xff]+'
                     quoted_pair = '\\x5c[\\x00-\\x7f]'
                     domain_literal = "\\x5b(?:#{dtext}|#{quoted_pair})*\\x5d"
                     quoted_string = "\\x22(?:#{qtext}|#{quoted_pair})*\\x22"
                     domain_ref = atom
                     sub_domain = "(?:#{domain_ref}|#{domain_literal})"
                     word = "(?:#{atom}|#{quoted_string})"
                     domain = "#{sub_domain}(?:\\x2e#{sub_domain})*"
                     local_part = "#{word}(?:\\x2e#{word})*"
                     addr_spec = "#{local_part}\\x40#{domain}"
                     /\A#{addr_spec}\z/n
                   end

    LOCAL_DOMAIN = 'test.me'

    def initialize(address)
      @address = address.to_s
    end

    def valid?
      address =~ EmailAddress
    end

    def invalid?
      !valid?
    end

    def local?
      address.end_with? LOCAL_DOMAIN
    end

    def remote?
      !local?
    end

    def to_s
      address
    end

    protected

    attr_reader :address

  end
end