Add previous, current and next forms to form handler

app/models/form_handler.rb

@@ -24,7 +24,15 @@ class FormHandler
     directories.each do |directory|
       Dir.glob("#{directory}/*.json").each do |form_path|
         form_name = File.basename(form_path, ".json")
-        forms[form_name] = Form.new(form_path, form_name)
+        form = Form.new(form_path, form_name)
+        forms[form_name] = form
+        if form.start_date.year + 1 == current_collection_start_year && forms["previous_lettings"].blank?
+          forms["previous_lettings"] = form
+        elsif form.start_date.year == current_collection_start_year && forms["current_lettings"].blank?
+          forms["current_lettings"] = form
+        elsif form.start_date.year - 1 == current_collection_start_year && forms["next_lettings"].blank?
+          forms["next_lettings"] = form
+        end
       end
     end
     forms
@@ -32,6 +40,12 @@ class FormHandler
 
 private
 
+  def current_collection_start_year
+    today = Time.zone.now
+    window_end_date = Time.zone.local(today.year, 4, 1)
+    today < window_end_date ? today.year - 1 : today.year
+  end
+
   def get_all_forms
     lettings_forms.merge(sales_forms)
   end

spec/models/form_handler_spec.rb

@@ -3,6 +3,32 @@ require "rails_helper"
 RSpec.describe FormHandler do
   let(:test_form_name) { "2021_2022" }
 
+  before { Singleton.__init__(described_class) }
+
+  context "when accessing a form in a different year" do
+    before do
+      Timecop.freeze(Time.utc(2021, 8, 3))
+    end
+
+    after do
+      Timecop.unfreeze
+    end
+
+    it "is able to load a current lettings form" do
+      form_handler = described_class.instance
+      form = form_handler.get_form("current_lettings")
+      expect(form).to be_a(Form)
+      expect(form.pages.count).to eq(45)
+    end
+
+    it "is able to load a next lettings form" do
+      form_handler = described_class.instance
+      form = form_handler.get_form("next_lettings")
+      expect(form).to be_a(Form)
+      expect(form.pages.count).to eq(12)
+    end
+  end
+
   describe "Get all forms" do
     it "is able to load all the forms" do
       form_handler = described_class.instance
@@ -19,6 +45,20 @@ RSpec.describe FormHandler do
       expect(form).to be_a(Form)
       expect(form.pages.count).to eq(45)
     end
+
+    it "is able to load a current lettings form" do
+      form_handler = described_class.instance
+      form = form_handler.get_form("current_lettings")
+      expect(form).to be_a(Form)
+      expect(form.pages.count).to eq(12)
+    end
+
+    it "is able to load a previous lettings form" do
+      form_handler = described_class.instance
+      form = form_handler.get_form("previous_lettings")
+      expect(form).to be_a(Form)
+      expect(form.pages.count).to eq(45)
+    end
   end
 
   describe "Current form" do