handle arbitrary number of header rows

app/services/bulk_upload/lettings/year2023/csv_parser.rb

@@ -10,7 +10,11 @@ class BulkUpload::Lettings::Year2023::CsvParser
   end
 
   def row_offset
-    with_headers? ? 7 : 0
+    if with_headers?
+      rows.find_index { |row| row[0].match(/field number/i) } + 1
+    else
+      0
+    end
   end
 
   def col_offset
@@ -57,7 +61,7 @@ private
   end
 
   def with_headers?
-    rows[0][0]&.match?(/Question/)
+    rows.map { |r| r[0] }.any? { |cell| cell&.match?(/field number/i) }
   end
 
   def row_sep

spec/services/bulk_upload/lettings/year2023/csv_parser_spec.rb

@@ -30,6 +30,30 @@ RSpec.describe BulkUpload::Lettings::Year2023::CsvParser do
     end
   end
 
+  context "when parsing csv with headers with extra rows" do
+    before do
+      file.write("Section\n")
+      file.write("Question\n")
+      file.write("Additional info\n")
+      file.write("Values\n")
+      file.write("Can be empty?\n")
+      file.write("Type of letting the question applies to\n")
+      file.write("Duplicate check field?\n")
+      file.write(BulkUpload::LogToCsv.new(log:).default_2023_field_numbers_row)
+      file.write(BulkUpload::LogToCsv.new(log:).to_2023_csv_row)
+      file.rewind
+    end
+
+    it "returns correct offsets" do
+      expect(service.row_offset).to eq(8)
+      expect(service.col_offset).to eq(1)
+    end
+
+    it "parses csv correctly" do
+      expect(service.row_parsers[0].field_13).to eql(log.tenancycode)
+    end
+  end
+
   context "when parsing csv with headers in arbitrary order" do
     let(:seed) { rand }