Refactor: Introduce PdfServiceBase for shared PDF fetching functionality and update Invoice/Estimate controllers to utilize new services

app/services/invoice_pdf_service.rb

@@ -7,54 +7,10 @@
 #The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
 #
 #THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-class InvoicePdfService
-  
-  require 'combine_pdf'
+class InvoicePdfService < PdfServiceBase
 
-  def initialize(qbo:)
-    @qbo = qbo
+  def self.model_class
+    Invoice
   end
 
-  # Fetches the PDF for the given invoice IDs. If multiple IDs are provided, their PDFs are combined into a single document.
-  def fetch_pdf(invoice_ids:)
-    log "Fetching PDFs for invoice IDs: #{invoice_ids.join(', ')}"
-    @qbo.perform_authenticated_request do |access_token|
-      service = Quickbooks::Service::Invoice.new(
-        company_id: @qbo.realm_id,
-        access_token: access_token
-      )
-
-      return single_pdf(service, invoice_ids.first) if invoice_ids.size == 1
-
-      combined_pdf(service, invoice_ids)
-    end
-  end
-
-  private
-
-  # Fetches a single PDF for the given invoice ID.
-  def single_pdf(service, id)
-    log "Fetching PDF for invoice ID: #{id}"
-    invoice = service.fetch_by_id(id)
-    [service.pdf(invoice), invoice.doc_number]
-  end
-
-  # Combines PDFs for multiple invoice IDs into a single PDF document and returns it along with a reference string.
-  def combined_pdf(service, ids)
-    log "Combining PDFs for invoice IDs: #{ids.join(', ')}"
-    pdf = CombinePDF.new
-    ref = []
-
-    ids.each do |id|
-      invoice = service.fetch_by_id(id)
-      ref << invoice.doc_number
-      pdf << CombinePDF.parse(service.pdf(invoice))
-    end
-
-    [pdf.to_pdf, ref.join(" ")]
-  end
-
-  def log(msg)
-    Rails.logger.info "[InvoicePdfService] #{msg}"
-  end
 end