module MailSpy
  module Manager

    # ------------------------------------------- ADD_TEMPLATE
    # Programmatically add email templates with a schema of search and
    # replaceable text
    #
    def add_template(name, html_erb, text_erb, template_values_definition)
      MailSpy::EmailTemplate.create!(
        {
          :name => name,
          :html_erb => html_erb,
          :text_erb => text_erb,
          :template_values_definition => template_values_definition
        })
    end

    # ------------------------------------------- ADD INSTANCE
    # Adds a instance of a email template to the queue to send
    #
    def add_instance(options)
      options.to_options!

      required_options = [
        :template_name, :campaign, :stream, :component, :schedule_at, :subject,
        :template_values, :from, :reply_to]
      to_options = [:to, :cc, :bcc]

      # Ensure that we have the required options
      required_options.each { |ro| raise "add_instance call missing #{ro}" unless options.include? ro }

      # Make sure we have someone to send to
      has_sender = options.keys.select { |option| to_options.include? option.intern }.present?
      raise "Email instance has no sender (to,cc,bcc were all blank)" unless has_sender

      # Make sure we have a template
      options[:template_name]
      template = MailSpy::EmailTemplate.first(conditions: {name: options[:template_name]})
      raise "No template: #{options[:template_name]} found, try add_template first" unless template


      # Make sure that
      (required_options + to_options).each do |option|
        unless MailSpy::Email.method_defined? "#{option}=".intern
          raise "MailSpy::Email doesn't have #{option} as a setter '"
        end
      end


      email = MailSpy::Email.create!(options)
      email.email_template = template
      email.save!
      email
    end

    # ------------------------------------------- SEND OUTSTANDING EMAILS
    # Batches through all the emails that were scheduled and have come due
    # sends them out (step many at a time)
    def send_outstanding_emails(step=100)
      raise "No Email service providers installed" unless MailSpy.esps.present?

      offset = 0
      sent = 0

      # Helper function for setting present values
      def set_if_present(email, pony_hash, pony_key, email_key=nil)
        email_key = pony_key if email_key.nil?
        value = email.send("#{email_key}")
        pony_hash[pony_key] = value if value.present?
      end

      while (true)
        mails = MailSpy::Email.
          limit(step).offset(offset).
          where(:schedule_at.lte => DateTime.now, :sent => false).all
        break if mails.blank?
        mails.each do |email|
          MailSpy::CoreMailer.template(email).deliver
          email.update_attribute(:sent, true)
          sent += 1
        end
        offset += step
      end

      sent
    end


    # ------------------------------------------- TRACKING
    #

    def track_other_action

    end

  end
end