class Br_phone

# File lib/br-phone.rb, line 6
def self.generate_cell_phone
  "+55#{'%07d' % rand(10**7)}#{'%04d' % rand(10**4)}"
end

# File lib/br-phone.rb, line 2
def initialize(phone)
  @phone = phone
end

# File lib/br-phone.rb, line 10
def return_valid
  return nil if @phone.nil?
  result = (is_valid? @phone) ? @phone.gsub(/\D+/, "") : '-'

  case (result.size || 0)
    when 13
      '+' << result
    when 12
      '+55' << result
    else
      nil
  end
end

# File lib/br-phone.rb, line 26
def is_valid?(phone)
  result = phone =~ /\A[+]?[0-9]*\.?[0-9]+\Z/
  return false if result.nil?

  result = phone.gsub(/\D+/, "")
  return result.size == 13 || result.size == 12
end