Prevent deactivations during deactivated periods

app/models/location.rb

@@ -424,6 +424,8 @@ class Location < ApplicationRecord
       elsif deactivation_date_type == "other"
         errors.add(:deactivation_date, message: I18n.t("validations.location.toggle_date.invalid"))
       end
+    elsif location_deactivation_periods.any? { |period| deactivation_date.between?(period.deactivation_date, period.reactivation_date) }
+      errors.add(:deactivation_date, message: I18n.t("validations.location.deactivation.during_deactivated_period"))
     else
       unless deactivation_date.between?(available_from, Time.zone.local(2200, 1, 1))
         errors.add(:deactivation_date, message: I18n.t("validations.location.toggle_date.out_of_range", date: available_from.to_formatted_s(:govuk_date)))

config/locales/en.yml

@@ -325,6 +325,8 @@ en:
         out_of_range: "The date must be on or after the %{date}"
       reactivation:
         before_deactivation: "This location was deactivated on %{date}\nThe reactivation date must be on or after deactivation date"
+      deactivation: 
+        during_deactivated_period: "The location is already deactivated during this date, please enter a different date"
 
   soft_validations:
     net_income:

spec/requests/locations_controller_spec.rb

@@ -1242,10 +1242,13 @@ RSpec.describe LocationsController, type: :request do
       let(:deactivation_date) { Time.utc(2022, 10, 10) }
       let!(:lettings_log) { FactoryBot.create(:lettings_log, :sh, location:, scheme:, startdate:, owning_organisation: user.organisation) }
       let(:startdate) {  Time.utc(2022, 10, 11) }
+      let(:add_deactivations) { nil }
 
       before do
         Timecop.freeze(Time.utc(2022, 10, 10))
         sign_in user
+        add_deactivations
+        location.save
         patch "/schemes/#{scheme.id}/locations/#{location.id}/new-deactivation", params:
       end
 
@@ -1371,6 +1374,17 @@ RSpec.describe LocationsController, type: :request do
           expect(page).to have_content(I18n.t("validations.location.toggle_date.invalid"))
         end
       end
+
+      context "when deactivation date is during a deactivated period" do
+        let(:deactivation_date) { Time.zone.local(2022, 10, 10) }
+        let(:params) { { location: { deactivation_date_type: "other", "deactivation_date(3i)": "8", "deactivation_date(2i)": "9", "deactivation_date(1i)": "2022" } } }
+        let(:add_deactivations) { location.location_deactivation_periods << FactoryBot.create(:location_deactivation_period, deactivation_date: Time.zone.local(2022, 5, 5), reactivation_date: Time.zone.local(2022, 10, 12)) }
+
+        it "displays page with an error message" do
+          expect(response).to have_http_status(:unprocessable_entity)
+          expect(page).to have_content(I18n.t("validations.location.deactivation.during_deactivated_period"))
+        end
+      end
     end
   end