detect fields

app/controllers/templates_debug_controller.rb

@@ -6,12 +6,18 @@ class TemplatesDebugController < ApplicationController
   DEBUG_FILE = ''
 
   def show
-    attachment = @template.documents.first
+    schema_uuids = @template.schema.index_by { |e| e['attachment_uuid'] }
+    attachment = @template.documents.find { |a| schema_uuids[a.uuid] }
 
     data = attachment.download
-    pdf = HexaPDF::Document.new(io: StringIO.new(data))
 
-    fields = Templates::FindAcroFields.call(pdf, attachment, data)
+    unless attachment.image?
+      pdf = HexaPDF::Document.new(io: StringIO.new(data))
+
+      fields = Templates::FindAcroFields.call(pdf, attachment, data)
+    end
+
+    fields = Templates::DetectFields.call(StringIO.new(data), attachment:) if fields.blank?
 
     attachment.metadata['pdf'] ||= {}
     attachment.metadata['pdf']['fields'] = fields

app/controllers/templates_detect_fields_controller.rb

@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+class TemplatesDetectFieldsController < ApplicationController
+  include ActionController::Live
+
+  load_and_authorize_resource :template
+
+  def create
+    response.headers['Content-Type'] = 'text/event-stream'
+
+    sse = SSE.new(response.stream)
+
+    documents = @template.schema_documents.preload(:blob)
+
+    documents.each do |document|
+      io = StringIO.new(document.download)
+
+      Templates::DetectFields.call(io, attachment: document) do |(attachment_uuid, page, fields)|
+        sse.write({ attachment_uuid:, page:, fields: })
+      end
+    end
+
+    sse.write({ completed: true })
+  ensure
+    response.stream.close
+  end
+end