From 44cd3993ac94e887d193a796e82036df93ad93fa Mon Sep 17 00:00:00 2001
From: Dmitry <ada.dmitry@gmail.com>
Date: Mon, 20 Apr 2026 18:45:52 +0000
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---
 app/services/report_parser.rb                | 33 ++++++++++++++++++--
 app/services/report_parsers/form12_parser.rb |  1 -
 2 files changed, 30 insertions(+), 4 deletions(-)

diff --git a/app/services/report_parser.rb b/app/services/report_parser.rb
index 62f48a1..fe233f2 100644
--- a/app/services/report_parser.rb
+++ b/app/services/report_parser.rb
@@ -64,10 +64,12 @@ class ReportParser
     target_years.each do |year|
       statement = find_or_build_statement(year)
       if should_update_statement?(statement)
+        previous_data = statement.data.deep_dup if statement.persisted?
+
         statement.assign_attributes(
           yearly_file: @yearly_file,
           sheet_number: year,
-          data: build_payload_for_year(year, parsed_forms, codes)
+          data: build_payload_for_year(year, parsed_forms, codes, previous_data: previous_data)
         )
         statement.save!
       end
@@ -82,9 +84,19 @@ class ReportParser
     years.sort.reverse
   end
 
-  def build_payload_for_year(year, parsed_forms, codes)
+  def build_payload_for_year(year, parsed_forms, codes, previous_data: nil)
     forms_payload = FORM_DEFINITIONS.each_with_object({}) do |(form_code, config), hash|
-      form_data = parsed_forms.fetch(form_code, {})[year] || {}
+      form_present, form_data = parsed_form_for_year(parsed_forms, form_code, year)
+      form_data ||= {}
+
+      unless form_present
+        previous_payload = previous_form_payload(previous_data, form_code)
+        if previous_payload.present?
+          hash[form_code] = previous_payload
+          next
+        end
+      end
+
       source_rows = form_data[:rows] || form_data['rows'] || []
       rows_by_code = index_rows_by_code(source_rows)
       form_codes = report_codes_for_form(form_code, codes)
@@ -111,6 +123,21 @@ class ReportParser
     }
   end
 
+  def parsed_form_for_year(parsed_forms, form_code, year)
+    form_results = parsed_forms.fetch(form_code, {})
+    return [true, form_results[year]] if form_results.key?(year)
+    return [true, form_results[year.to_s]] if form_results.key?(year.to_s)
+
+    [false, {}]
+  end
+
+  def previous_form_payload(previous_data, form_code)
+    forms = previous_data && (previous_data[:forms] || previous_data['forms'])
+    return unless forms.is_a?(Hash)
+
+    forms[form_code] || forms[form_code.to_sym]
+  end
+
   def index_rows_by_code(rows)
     rows.each_with_object({}) do |row, hash|
       normalized_code = normalize_code(row[:line_code] || row['line_code'])
diff --git a/app/services/report_parsers/form12_parser.rb b/app/services/report_parsers/form12_parser.rb
index 12df2d8..80ac29b 100644
--- a/app/services/report_parsers/form12_parser.rb
+++ b/app/services/report_parsers/form12_parser.rb
@@ -83,7 +83,6 @@ module ReportParsers
         has_code = normalized_cells.any? { |text| text == 'код' || text.start_with?('код ') || text.start_with?('код:') }
         return row if has_name && has_code
       end
-
       1
     end