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# frozen_string_literal: true
require 'singleton'
# RelationshipManager class to manage relationships between people.
# This class follows the Singleton pattern to ensure there is only one instance
# of the relationship manager throughout the application.
class RelationshipManager
include Singleton
# Links two people as spouses.
#
# @param person1 [Person] The first person to link.
# @param person2 [Person] The second person to link.
# @raise [RuntimeError] if either person is already linked to someone else.
# @return [void]
def link_spouses(person1, person2)
# Check if either person is already linked to someone else
if person1.spouse != NilPerson.new && person1.spouse != person2
raise "Cannot link #{person1.name} and #{person2.name}: #{person1.name} is already linked to #{person1.spouse.name}."
end
if person2.spouse != NilPerson.new && person2.spouse != person1
raise "Cannot link #{person1.name} and #{person2.name}: #{person2.name} is already linked to #{person2.spouse.name}."
end
# Link the spouses
person1.spouse = person2
person2.spouse = person1 unless person2.is_a?(NilPerson)
end
end
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