dynamic_mail_templates_controller.rb

class Developers::Api::DynamicMailTemplatesController < Developers::Api::BaseController
  model_class DynamicMailTemplate

  before_filter :find_email_context, only: [:preview, :send_email]

  # GET /developers/dynamic_mail_templates
  # GET /developers/dynamic_mail_templates.json
  def index
    render json: DynamicMailTemplate.all.map { |d| api_serialize(d) }
  end

  # GET /developers/dynamic_mail_templates/preview
  def preview
    render json: { count: @users.length }
  end

  # POST /developers/dynamic_mail_templates/send
  def send_email
    DynamicMailerWorker::add_to_queue_sliced(@template.slug, @users, idempotent: false)
    render json: { count: @users.length }
  end

  protected
  def find_email_context
    return if find_channel.blank? or find_template.blank?

    target = params[:target]

    @users = user_ids_for_target(target)
    if @users.nil?
      render json: { error: "Invalid target" } and return
    end
  end

  def find_channel
    channel_slug = params[:channel]
    @channel = Channel.find_by_module_name(channel_slug)
    if @channel.blank?
      render json: { error: "Channel #{channel_slug} missing" } and return
    end
    @channel
  end

  def find_template
    template_slug = params[:slug]
    @template = DynamicMailTemplate.find_by_slug(template_slug)
    if @template.blank?
      render json: { error: "Template #{template_slug} missing" } and return
    end
    @template
  end

  def user_ids_for_target(target)
    case @target
    when "admins"
      @channel.admin_ids
    when "users"
      @channel.live_channels.map(&:user_id)
    else
      nil
    end
  end

end