$(document).on 'ready', ->
  Dropzone.autoDiscover = false;

  $("#new_attachment").dropzone(
    maxFilesize: 15
    addRemoveLinks: true
    paramName: "attachment[doc]"
    success: (file, response) ->
      response        = JSON.parse(file.xhr.response)
      showDocTemplate = HandlebarsTemplates['show_doc_links'](attachments: [response.attachment])

      $('.show-doc__message').replaceWith('<div class="show-doc__link-group"></div>')
      $('.show-doc__link-group').append(showDocTemplate)
  )

= form_for [@shipment, Attachment.new], html: { multipart: true, class: 'dropzone' } do |f|
  .fallback
    = f.file_field :doc

class AttachmentsController < ApplicationController
  before_action :set_attachment, only: :create

  load_and_authorize_resource

  respond_to :js, except: :create
  respond_to :json, only: :create

  def show
    send_file @attachment.doc.path, disposition: 'inline'
  end

  def create
    @attachment.save
    respond_with @attachment
  end

  def destroy
    respond_with @attachment.destroy, location: location
  end

  private

  def location
    if @attachment.attachable.is_a?(Flight)
      admin_flights_url(@attachment.attachable)
    else
      @attachment.attachable
    end
  end

  def attachment_params
    params.require(:attachment).permit(:doc, :doc_type)
  end

  def set_attachment
    attachable_id = params.keys.detect { |k| k =~ /(shipment|flight)_id/ }
    attachable    = $1.classify.constantize.find(params[attachable_id])
    @attachment   = attachable.attachments.build(attachment_params)
  end
end