# Added to effective email templates mailers

module EffectiveEmailTemplatesMailer
  extend ActiveSupport::Concern

  def mail(headers = {}, &block)
    email_template = Effective::EmailTemplate.where(template_name: action_name).first
    return super() if email_template.blank?

    assigns = (@assigns || {})

    # Parse assigns. Special keys for body and subject.
    body = assigns.delete(:body) || headers[:body] || headers['body']
    email_template.body = body if body.present?

    # Ignore the subject when passed in via mail method subject: key.
    subject = assigns.delete(:subject)
    email_template.subject = subject if subject.present?

    # Add any _url helpers
    assigns = route_url_assigns(email_template).merge(assigns)

    # Render from the template, possibly with updated body
    rendered = email_template.render(assigns)

    super(rendered.merge(headers.except(:body, :subject, 'body', 'subject')))
  end

  private

  def route_url_assigns(email_template)
    email_template.template_variables.select { |name| name.ends_with?('_url') }.inject({}) do |h, name|
      h[name] = public_send(name) if respond_to?(name); h
    end
  end

end