Implement key data model

- Added classes for Person, Gender, Family, FamilyTree
- Replaced FamilyTreeManager with FamilyTree
- Add FamilyFactory for seeding the initial FamilyTree for King Arthur and Queen Margaret
- Added a RelationshipManager for linking spouses correctly
- Refactored ActionFileExecutor for readability
- More test coverage

1 files changed, 66 insertions, 2 deletions

diff --git a/lib/family_tree.rb b/lib/family_tree.rb
index 934d32e..ebb2955 100644
--- a/lib/family_tree.rb
+++ b/lib/family_tree.rb
@@ -1,15 +1,79 @@
 # frozen_string_literal: true
 
+require 'singleton'
+
+require_relative 'person'
+require_relative 'family_factory'
+
 class FamilyTree
+  include Singleton
+
+  attr_accessor :families, :people
+
   def initialize
+    @families = FamilyFactory.new.create_families
     @people = []
   end
 
+  def add_family(family)
+    @families << family unless @families.include?(family)
+  end
+
   def add_child(*params)
     puts "Adding Child with params: #{params.join(', ')}"
   end
 
-  def query_hierarchy(*params)
-    puts "Querying Hierarcy with params: #{params.join(', ')}"
+  def get_relationship(name, relationship)
+    family = find_family(name)
+
+    return [] if family.nil?
+
+    if child_of_family?(family, name)
+      case relationship.downcase
+      when 'mother'
+        mother = find_mother(family)
+        return mother.is_a?(NilPerson) ? [] : [mother]
+      when 'father'
+        father = find_father(family)
+        return father.is_a?(NilPerson) ? [] : [father]
+      when 'siblings'
+        return find_siblings(family, name)
+      else
+        return []
+      end
+    end
+
+    []
+  end
+
+  def find_family(name)
+    families.each do |family|
+      family.children.each do |child|
+        return family if child.name.casecmp(name).zero?
+      end
+    end
+    nil
+  end
+
+  def find_mother(family)
+    mother = family.mother
+    mother || NilPerson.new
+  end
+
+  def find_father(family)
+    father = family.father
+    father || NilPerson.new
+  end
+
+  def find_siblings(family, name)
+    family.children.reject { |child| child.name.casecmp(name).zero? }
+  end
+
+  def child_of_family?(family, name)
+    return false unless family.is_a?(Family)
+
+    family.children.any? do |child|
+      child.name.casecmp(name).zero?
+    end
   end
 end