order_assets_download_creator.rb

class OrderAssetsZipDownloadCreator

  def self.build(order)
    @order = order

    unless @order.download_zip_url.present? #prevent duplicate images from being added to zip.
      reupload_assets_with_tag
      create_zip
    end
  end

  def self.build_and_assign_to(order)
    order.update_attributes(download_zip_url: build(order),
                            download_zip_created_at: Time.now)
  end

  private

  def self.reupload_assets_with_tag
    @order.line_items.each do |item|
      if item.job
        upload_job_assets(item)
      else
        upload_product_assets(item)
      end
    end
    upload_order_pdf
    upload_order_packing_slip
  end

  def self.create_zip
    begin
      zip = Cloudinary::Uploader.multi(order_tag, :format => 'zip')
      zip['url']
    rescue CloudinaryException
      return false
      # no images with tag are found by Cloudinary, but let code continue to execute.
    end
  end

  def self.upload_order_pdf
    begin
      Cloudinary::Uploader.upload(order_pdf_url, tags: [order_tag], public_id: "#{@order.number}_order_pdf_#{@order.id}")
    rescue CloudinaryException
      return false
    end
  end

  def self.order_pdf_url
    if Rails.env.development? || Rails.env.test?
      "http://res.cloudinary.com/decosites/image/upload/v1415549444/Test_pdf_cfp8z8.pdf"
    else
      "http://#{@order.website.subdomain_in_hostname}/site_manager/orders/#{@order.id}/edit.pdf"
    end
  end

  def self.upload_order_packing_slip
    begin
      Cloudinary::Uploader.upload(order_packing_slip_url, tags: [order_tag], public_id: "#{@order.number}_order_ps_#{@order.id}")
    rescue CloudinaryException
      return false
    end
  end

  def self.order_packing_slip_url
    if Rails.env.development? || Rails.env.test?
      "http://res.cloudinary.com/decosites/image/upload/v1415549444/Test_pdf_cfp8z8.pdf"
    else
      "http://#{@order.website.subdomain_in_hostname}/site_manager/orders/#{@order.id}/edit.pdf?packing_slip=true"
    end
  end

  def self.upload_product_assets(item)
    url = download_url(item)
    unless url =~ /fallback/
      begin
        Cloudinary::Uploader.upload(url, tags: [order_tag], public_id: product_asset_public_id(item))
      rescue CloudinaryException
        return false
      end
    end
  end

  def self.upload_job_assets(item)
    item.job.jobable.job_items.each do |job_item|
      url = download_url(job_item)
      unless url =~ /fallback/
        begin
          Cloudinary::Uploader.upload(url, tags: [order_tag], public_id: job_asset_public_id(item, job_item))
        rescue CloudinaryException
          return false
        end
      end
    end
  end

  def self.download_url(asset)
    if asset.class == LineItem
      asset.download_link
    else
      asset.cropped? ? CropPresenter.url(asset, true) : asset.picture_url
    end
  end

  def self.item_count(item)
    @order.line_items.index(item) + 1
  end

  def self.job_item_count(item, job_item)
    item.job.jobable.job_items.index(job_item) + 1
  end

  def self.order_tag
    "asf_order_#{@order.number}_#{@order.id}"
  end

  def self.product_asset_public_id(item)
    "#{@order.number}-#{item_count(item)}_#{item.product.name.parameterize}_#{item.quantity}_#{item.attrs['size']}_#{item.medium_name.try(:parameterize)}_#{item.id}"
  end

  def self.job_asset_public_id(item, job_item)
    "#{@order.number}-#{item_count(item)}-#{job_item_count(item, job_item)}_#{job_item.picture.my_public_id}_#{job_item.size}_#{job_item.id}"
  end

end