Check correct template for lettings

app/services/bulk_upload/lettings/validator.rb

@@ -8,6 +8,7 @@ class BulkUpload::Lettings::Validator
   validate :validate_file_not_empty
   validate :validate_field_numbers_count
   validate :validate_max_columns_count_if_no_headers
+  validate :validate_correct_template
 
   def initialize(bulk_upload:, path:)
     @bulk_upload = bulk_upload
@@ -158,6 +159,12 @@ private
     errors.add(:base, :over_max_column_count) if csv_parser.too_many_columns?
   end
 
+  def validate_correct_template
+    return if halt_validations?
+
+    errors.add(:base, :wrong_template) unless csv_parser.correct_template_for_year?
+  end
+
   def halt_validations!
     @halt_validations = true
   end

app/services/bulk_upload/lettings/year2022/csv_parser.rb

@@ -61,6 +61,10 @@ class BulkUpload::Lettings::Year2022::CsvParser
     max_columns_count > MAX_COLUMNS
   end
 
+  def correct_template_for_year?
+    true
+  end
+
 private
 
   def default_field_numbers

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

@@ -1,6 +1,8 @@
 require "csv"
 
 class BulkUpload::Lettings::Year2023::CsvParser
+  include CollectionTimeHelper
+
   FIELDS = 134
   MAX_COLUMNS = 142
 
@@ -61,6 +63,12 @@ class BulkUpload::Lettings::Year2023::CsvParser
     max_columns_count > MAX_COLUMNS
   end
 
+  def correct_template_for_year?
+    collection_start_year_for_date(first_record_start_date) == 2023
+  rescue Date::Error
+    true
+  end
+
 private
 
   def default_field_numbers
@@ -92,4 +100,16 @@ private
 
     @normalised_string
   end
+
+  def has_field_in_header?(field)
+    rows[rows.find_index { |row| row[0].match(/field number/i) }].any? { |cell| cell&.match?(/#{field}/i) }
+  end
+
+  def first_record_start_date
+    if with_headers?
+      Date.new(row_parsers.first.field_98.to_i + 2000, row_parsers.first.field_97.to_i, row_parsers.first.field_96.to_i)
+    else
+      Date.new(rows.first[97].to_i + 2000, rows.first[96].to_i, rows.first[95].to_i)
+    end
+  end
 end

config/locales/en.yml

@@ -50,12 +50,13 @@ en:
             base:
               wrong_field_numbers_count: "Incorrect number of fields, please ensure you have used the correct template"
               over_max_column_count: "Too many columns, please ensure you have used the correct template"
+              wrong_template: "Incorrect start dates, please ensure you have used the correct template"
         bulk_upload/sales/validator:
           attributes:
             base:
               wrong_field_numbers_count: "Incorrect number of fields, please ensure you have used the correct template"
               over_max_column_count: "Too many columns, please ensure you have used the correct template"
-              wrong_template: "Incorrect fields, please ensure you have used the correct template"
+              wrong_template: "Incorrect sale dates, please ensure you have used the correct template"
         forms/bulk_upload_lettings/year:
           attributes:
             year:

spec/services/bulk_upload/lettings/validator_spec.rb

@@ -191,6 +191,39 @@ RSpec.describe BulkUpload::Lettings::Validator do
           end
         end
       end
+
+      context "when uploading a 2022 template for 2023 bulk upload" do
+        let(:bulk_upload) { create(:bulk_upload, user:, year: 2023) }
+        let(:log) { build(:lettings_log, :completed, startdate: Time.zone.local(2022, 5, 6)) }
+
+        context "with no headers" do
+          before do
+            file.write(BulkUpload::LettingsLogToCsv.new(log:, line_ending: "\r\n", col_offset: 0).to_2022_csv_row)
+            file.close
+          end
+
+          it "is not valid" do
+            expect(validator).not_to be_valid
+          end
+        end
+
+        context "with headers" do
+          let(:seed) { rand }
+          let(:log_to_csv) { BulkUpload::LettingsLogToCsv.new(log:) }
+          let(:field_numbers) { log_to_csv.default_2022_field_numbers + %w[invalid_field_number] }
+          let(:field_values) { log_to_csv.to_2022_row + %w[value_for_invalid_field_number] }
+
+          before do
+            file.write(log_to_csv.custom_field_numbers_row(seed:, field_numbers:))
+            file.write(log_to_csv.to_custom_csv_row(seed:, field_values:))
+            file.rewind
+          end
+
+          it "is not valid" do
+            expect(validator).not_to be_valid
+          end
+        end
+      end
     end
   end