module FreeEmailChecker

# File lib/free_email_checker.rb, line 5
def self.check(email)
  check = { free: false, domain: false, status: ""}
  if (email =~ /\A[\w+\-.]+@[a-z\d\-.]+\.[a-z]+\z/i) == 0
    w = email.split("@").last
    domains_path = File.join( File.dirname(__FILE__), 'email_provider_domains.txt' )
    file = File.readlines( domains_path )
    if file.grep(/#{w}/).size > 0
      check[:free] = true
      check[:status] = "#{email} found in free email provider list."
    else
      require 'resolv-ipv6favor'
      mx = Resolv::DNS::Resource::IN::MX
      response = Resolv::DNS.new.getresources(w, mx)
      if response.size > 0
        check[:domain] = true
        t = "Found mx record(s) for #{w}; "
        response.each do |r|
          t = t.concat(r.exchange.to_s + ", ")
        end
        check[:status] = t
      else
        check[:status] = "Most propably #{w} does not exist."
      end
    end
  else
    check[:status] = "#{email} is not a valid email address"
  end
  return check
end