incoming_mail_handler.rb

require 'mms2r'

class IncomingMailHandler < ActionMailer::Base

  # Receive and process emails
  def receive(email)
    mms = MMS2R::Media.new(email)
    photos = get_images_from_email(mms)
    pemail = PhotoEmail.create_from_mail_handler(email, mms)
    logit "Processing email from #{pemail.sender} with subject #{pemail.subject} "
    pemail.determine_and_save_kase_and_doc
    logit(pemail.matched_by ? "Subject was matched via #{matched_by}" : "Subject could not be matched.")
    if photos.length > 0
      logit "Photos are attached to this email. Beginning to process."
      if attachments = Photo.save_from_email(photos, pemail)
        logit "Email has #{attachments} valid photos attached. Successfully saved."
        status = pemail.doctor_id ? 2 : 1
        pemail.update_attributes(:attachments => attachments,
                                 :photo_email_status_id => status)
      else
        logit "Email has failed while processing. Returned as bad photo format."
        pemail.update_attributes(:photo_email_status_id => 3)
      end
    else
      logit "Email has no photos attached. Email sent to sender to notify."
      pemail.update_attributes(:photo_email_status_id => 4)
    end
    logit "Email has been processed."
    send_mail_notification(pemail)
    mms.purge
  end

  protected

  # Extracts images (photos and pdfs) from an email (mms2r object)
  def get_images_from_email mms
    images = mms.media.select{|k,v| k[0..4] == "image" || k.include?('pdf')}
    images.collect{|a|a[1]}.flatten
  end

  # Invokes the correct notifier according to pemail status
  def send_mail_notification pemail
    case pemail.photo_email_status_id
      when 1 : Notifier.deliver_photos_via_email(pemail.doctor, pemail.kase_id, pemail)
      when 2 : Notifier.deliver_unknown_photos_via_email(pemail)
      when 3 : Notifier.deliver_wrong_photo_format(pemail.sender)
      when 4 : Notifier.deliver_no_photos_attached(pemail.sender)
    end
  end

  # Simple logger
  def logit message
    puts "#{Time.now.strftime('%x %X')}: " + message
  end

end