Add base errors for start date

app/models/location.rb

@@ -393,6 +393,13 @@ class Location < ApplicationRecord
     status == :reactivating_soon
   end
 
+  def status_during(date)
+    return :reactivating_soon if location_deactivation_periods.any? { |period| period.reactivation_date.present? && date.between?(period.deactivation_date, period.reactivation_date) } || available_from > date
+
+    open_deactivation = location_deactivation_periods.deactivations_without_reactivation.first
+    return :deactivated if open_deactivation.present? && open_deactivation.deactivation_date < date
+  end
+
 private
 
   PIO = PostcodeService.new

app/models/validations/date_validations.rb

@@ -59,6 +59,14 @@ module Validations::DateValidations
     if record["mrcdate"].present? && record.startdate < record["mrcdate"]
       record.errors.add :startdate, I18n.t("validations.setup.startdate.after_major_repair_date")
     end
+
+    if record.location&.status_during(record.startdate) == :deactivated
+      record.errors.add :startdate, I18n.t("validations.setup.startdate.during_deactivated_location")
+    end
+
+    if record.location&.status_during(record.startdate) == :reactivating_soon
+      record.errors.add :startdate, I18n.t("validations.setup.startdate.location_reactivating_soon")
+    end
   end
 
 private

spec/models/validations/date_validations_spec.rb

@@ -83,6 +83,76 @@ RSpec.describe Validations::DateValidations do
       date_validator.validate_startdate(record)
       expect(record.errors["startdate"]).to be_empty
     end
+
+    context "with a deactivated location" do
+      let(:scheme) { create(:scheme) }
+      let(:location) { create(:location, scheme:, startdate: nil) }
+
+      before do
+        create(:location_deactivation_period, deactivation_date: Time.zone.local(2022, 6, 4), location:)
+        location.reload
+      end
+
+      it "produces error when tenancy start date is during deactivated location period" do
+        record.startdate = Time.zone.local(2022, 7, 5)
+        record.location = location
+        date_validator.validate_startdate(record)
+        expect(record.errors["startdate"])
+        .to include(match I18n.t("validations.setup.startdate.during_deactivated_location"))
+      end
+
+      it "produces no error when tenancy start date is during an active location period" do
+        record.startdate = Time.zone.local(2022, 6, 1)
+        record.location = location
+        date_validator.validate_startdate(record)
+        expect(record.errors["startdate"]).to be_empty
+      end
+    end
+
+    context "with a location that is reactivating soon" do
+      let(:scheme) { create(:scheme) }
+      let(:location) { create(:location, scheme:, startdate: nil) }
+
+      before do
+        create(:location_deactivation_period, deactivation_date: Time.zone.local(2022, 6, 4), reactivation_date: Time.zone.local(2022, 8, 4), location:)
+        location.reload
+      end
+
+      it "produces error when tenancy start date is during deactivated location period" do
+        record.startdate = Time.zone.local(2022, 7, 5)
+        record.location = location
+        date_validator.validate_startdate(record)
+        expect(record.errors["startdate"])
+        .to include(match I18n.t("validations.setup.startdate.location_reactivating_soon"))
+      end
+
+      it "produces no error when tenancy start date is during an active location period" do
+        record.startdate = Time.zone.local(2022, 9, 1)
+        record.location = location
+        date_validator.validate_startdate(record)
+        expect(record.errors["startdate"]).to be_empty
+      end
+    end
+
+    context "with a location with no deactivation periods" do
+      let(:scheme) { create(:scheme) }
+      let(:location) { create(:location, scheme:, startdate: Time.zone.local(2022, 9, 15)) }
+
+      it "produces no error" do
+        record.startdate = Time.zone.local(2022, 10, 15)
+        record.location = location
+        date_validator.validate_startdate(record)
+        expect(record.errors["startdate"]).to be_empty
+      end
+
+      it "produces an error when the date is before available_from date" do
+        record.startdate = Time.zone.local(2022, 8, 15)
+        record.location = location
+        date_validator.validate_startdate(record)
+        expect(record.errors["startdate"])
+        .to include(match I18n.t("validations.setup.startdate.location_reactivating_soon"))
+      end
+    end
   end
 
   describe "major repairs date" do