Validate tenancy start date against location availability

app/models/location.rb

@@ -180,6 +180,11 @@ class Location < ApplicationRecord
     status_at(6.months.from_now) == :deactivating_soon
   end
 
+  def active_on_date?(date)
+    status = status_at(date)
+    %i[active deactivating_soon].include?(status)
+  end
+
   def validate_postcode
     if !postcode&.match(POSTCODE_REGEXP)
       error_message = I18n.t("validations.postcode")

app/models/scheme.rb

@@ -298,6 +298,13 @@ class Scheme < ApplicationRecord
   def all_locations_inactive?
     active? && locations.all? { |location| !location.active? }
   end
+
+  def any_location_active_on_date?(date)
+    return false unless date
+
+    locations.any? { |location| date && location.active_on_date?(date) }
+  end
+
   def reactivating_soon?
     status == :reactivating_soon
   end

app/models/validations/setup_validations.rb

@@ -93,6 +93,10 @@ module Validations::SetupValidations
     scheme_during_startdate_validation(record)
   end
 
+  def validate_tenancy(record)
+    tenancy_during_startdate_validation(record)
+  end
+
   def validate_managing_organisation_data_sharing_agremeent_signed(record)
     return if record.skip_dpo_validation
 

app/models/validations/shared_validations.rb

@@ -84,6 +84,17 @@ module Validations::SharedValidations
     end
   end
 
+  def tenancy_during_startdate_validation(record)
+    return if record.startdate.blank?
+
+    if record.scheme.present? && !record.scheme.any_location_active_on_date?(record.startdate)
+      record.errors.add :startdate, I18n.t("validations.setup.startdate.scheme.locations_inactive.startdate", name: record.scheme.service_name, date: record.startdate)
+    end
+    if record.location.present? && !record.location.active_on_date?(record.startdate)
+      record.errors.add :startdate, I18n.t("validations.setup.startdate.location.deactivated.startdate", postcode: record.location.postcode)
+    end
+  end
+
   def inactive_status(date, resource)
     return if date.blank? || resource.blank?