# frozen_string_literal: true
require 'mail/check_delivery_params'

module Mail
  # == Sending Email with SMTP
  # 
  # Mail allows you to send emails using an open SMTP connection.  This is done by
  # passing a created Net::SMTP object.  This way we can get better performance to
  # our local mail server by reducing the number of connections at any one time.
  #
  # === Sending via SMTP server on Localhost
  # 
  # To send mail open a connection with Net::Smtp using any options you like
  # === Delivering the email
  # 
  # Once you have the settings right, sending the email is done by:
  #
  #   smtp_conn = Net::SMTP.start(settings[:address], settings[:port])
  #   Mail.defaults do
  #     delivery_method :smtp_connection, { :connection => smtp_conn }
  #   end
  # 
  #   Mail.deliver do
  #     to 'mikel@test.lindsaar.net'
  #     from 'ada@test.lindsaar.net'
  #     subject 'testing sendmail'
  #     body 'testing sendmail'
  #   end
  # 
  # Or by calling deliver on a Mail message
  # 
  #   mail = Mail.new do
  #     to 'mikel@test.lindsaar.net'
  #     from 'ada@test.lindsaar.net'
  #     subject 'testing sendmail'
  #     body 'testing sendmail'
  #   end
  # 
  #   mail.deliver!
  class SMTPConnection
    attr_accessor :smtp, :settings

    def initialize(values)
      raise ArgumentError.new('A Net::SMTP object is required for this delivery method') if values[:connection].nil?
      self.smtp = values[:connection]
      self.settings = values
    end

    # Send the message via SMTP.
    # The from and to attributes are optional. If not set, they are retrieve from the Message.
    def deliver!(mail)
      smtp_from, smtp_to, message = Mail::CheckDeliveryParams.check(mail)

      response = smtp.sendmail(dot_stuff(message), smtp_from, smtp_to)

      settings[:return_response] ? response : self
    end

    private
      # This is Net::SMTP's job, but before Ruby 2.x it does not dot-stuff
      # an unterminated last line: https://bugs.ruby-lang.org/issues/9627
      def dot_stuff(message)
        message.gsub(/(\r\n\.)(\r\n|$)/, '\1.\2')
      end
  end
end