module Mailkick
  class Processor
    attr_reader :message

    def initialize(message)
      @message = message
    end

    def process
      email = message.to.first
      user = Mailkick.user_method.call(email) if Mailkick.user_method

      verifier = ActiveSupport::MessageVerifier.new(Mailkick.secret_token)
      token = verifier.generate([email, user.try(:id), user.try(:class).try(:name)])

      parts = message.parts.any? ? message.parts : [message]
      parts.each do |part|
        part.body.raw_source.gsub!(/%7B%7BMAILKICK_TOKEN%7D%7D/, token)
      end
    end

  end
end