Add out of range validation

app/controllers/locations_controller.rb

@@ -172,23 +172,28 @@ private
     month = params[:location]["deactivation_date(2i)"]
     year = params[:location]["deactivation_date(1i)"]
 
+    collection_start_date = FormHandler.instance.current_collection_start_date
 
-    if [day, month, year].any?(&:blank?) || !Date.valid_date?(year.to_i, month.to_i, day.to_i) || !year.to_i.between?(2000, 2200)
+    if !deactivation_date_valid?(day, month, year, collection_start_date)
-      set_deactivation_date_errors(day, month, year)
+      set_deactivation_date_errors(day, month, year, collection_start_date)
     else
       Date.new(year.to_i, month.to_i, day.to_i)
     end
   end
 
-  def set_deactivation_date_errors(day, month, year)
+  def deactivation_date_valid?(day, month, year, collection_start_date)
+    [day, month, year].all?(&:present?) && Date.valid_date?(year.to_i, month.to_i, day.to_i) && Date.new(year.to_i, month.to_i, day.to_i).between?(collection_start_date, Time.new(2200,1,1))
+  end
+
+  def set_deactivation_date_errors(day, month, year, collection_start_date)
     if [day, month, year].any?(&:blank?)
       {day:, month:, year:}.each do |period, value| 
         @location.errors.add(:deactivation_date, message: I18n.t("validations.location.deactivation_date.not_entered", period: period.to_s )) if value.blank?
       end
     elsif !Date.valid_date?(year.to_i, month.to_i, day.to_i)
       @location.errors.add(:deactivation_date, message: I18n.t("validations.location.deactivation_date.invalid"))
-    elsif !year.to_i.between?(2000, 2200)
+    elsif !Date.new(year.to_i, month.to_i, day.to_i).between?(collection_start_date, Time.new(2200,1,1))
-      @location.errors.add(:deactivation_date, message: I18n.t("validations.location.deactivation_date.invalid"))
+      @location.errors.add(:deactivation_date, message: I18n.t("validations.location.deactivation_date.out_of_range", date: collection_start_date.to_formatted_s(:govuk_date)))
     end
   end
 end

config/locales/en.yml

@@ -317,6 +317,7 @@ en:
         not_selected: "Select one of the options"
         not_entered: "Enter a %{period}"
         invalid: "Enter a valid date"
+        out_of_range: "The date must be on or after the %{date}"
 
   soft_validations:
     net_income:

spec/requests/locations_controller_spec.rb

@@ -1296,6 +1296,15 @@ RSpec.describe LocationsController, type: :request do
         end
       end
 
+      context "when the date is entered is before the beginning of current collection window" do
+        let(:params) { { location: { "deactivation_date": "other", "deactivation_date(3i)": "10", "deactivation_date(2i)": "4", "deactivation_date(1i)": "2020"} }}
+
+        it "displays the new page with an error message" do
+          expect(response).to have_http_status(:unprocessable_entity)
+          expect(page).to have_content(I18n.t("validations.location.deactivation_date.out_of_range", date: "5 April 2022"))
+        end
+      end
+
       context "when the day is not entered" do
         let(:params) { { location: { "deactivation_date": "other", "deactivation_date(3i)": "", "deactivation_date(2i)": "2", "deactivation_date(1i)": "2022"} }}