require "rails_helper"

RSpec.describe FormHandler do
  let(:form_handler) { described_class.instance }

  before do
    Timecop.freeze(Time.utc(2022, 9, 20))
    Singleton.__init__(described_class)
  end

  after do
    Timecop.unfreeze
    Singleton.__init__(described_class)
  end

  context "when accessing a form in a different year" do
    before do
      Timecop.freeze(Time.utc(2021, 8, 3))
      Singleton.__init__(described_class)
    end

    after do
      Timecop.unfreeze
      Singleton.__init__(described_class) # reload FormHandler Instance to update form definitions between runs
    end

    it "is able to load a current lettings form" do
      form = form_handler.get_form("current_lettings")
      expect(form).to be_a(Form)
      expect(form.pages.count).to eq(46)
    end

    it "is able to load a next lettings form" do
      form = form_handler.get_form("next_lettings")
      expect(form).to be_a(Form)
      expect(form.pages.count).to eq(13)
    end
  end

  describe "Get all forms" do
    it "is able to load all the forms" do
      all_forms = form_handler.forms
      expect(all_forms.count).to be >= 1
      expect(all_forms["current_sales"]).to be_a(Form)
    end
  end

  describe "Get specific form" do
    it "is able to load a current lettings form" do
      form = form_handler.get_form("current_lettings")
      expect(form).to be_a(Form)
      expect(form.pages.count).to eq(13)
    end

    it "is able to load a previous lettings form" do
      form = form_handler.get_form("previous_lettings")
      expect(form).to be_a(Form)
      expect(form.pages.count).to eq(46)
    end

    it "is able to load a current sales form" do
      form = form_handler.get_form("current_sales")
      expect(form).to be_a(Form)
      expect(form.pages.count).to eq(44)
      expect(form.name).to eq("2022_2023_sales")
    end

    it "is able to load a previous sales form" do
      form = form_handler.get_form("previous_sales")
      expect(form).to be_a(Form)
      expect(form.pages.count).to eq(44)
      expect(form.name).to eq("2021_2022_sales")
    end
  end

  describe "Current form" do
    it "returns the latest form by date" do
      form = form_handler.current_lettings_form
      expect(form).to be_a(Form)
      expect(form.start_date.year).to eq(2022)
    end
  end

  describe "Current collection start year" do
    context "when the date is after 1st of April" do
      before do
        Timecop.freeze(Time.utc(2022, 8, 3))
      end

      after do
        Timecop.unfreeze
      end

      it "returns the same year as the current start year" do
        expect(form_handler.current_collection_start_year).to eq(2022)
      end

      it "returns the correct current lettings form name" do
        expect(form_handler.form_name_from_start_year(2022, "lettings")).to eq("current_lettings")
      end

      it "returns the correct previous lettings form name" do
        expect(form_handler.form_name_from_start_year(2021, "lettings")).to eq("previous_lettings")
      end

      it "returns the correct next lettings form name" do
        expect(form_handler.form_name_from_start_year(2023, "lettings")).to eq("next_lettings")
      end

      it "returns the correct current sales form name" do
        expect(form_handler.form_name_from_start_year(2022, "sales")).to eq("current_sales")
      end

      it "returns the correct previous sales form name" do
        expect(form_handler.form_name_from_start_year(2021, "sales")).to eq("previous_sales")
      end

      it "returns the correct next sales form name" do
        expect(form_handler.form_name_from_start_year(2023, "sales")).to eq("next_sales")
      end

      it "returns the correct current start date" do
        expect(form_handler.current_collection_start_date).to eq(Time.utc(2022, 4, 1))
      end
    end

    context "with the date before 1st of April" do
      before do
        Timecop.freeze(Time.utc(2022, 2, 3))
      end

      after do
        Timecop.unfreeze
      end

      it "returns the previous year as the current start year" do
        expect(form_handler.current_collection_start_year).to eq(2021)
      end

      it "returns the correct current lettings form name" do
        expect(form_handler.form_name_from_start_year(2021, "lettings")).to eq("current_lettings")
      end

      it "returns the correct previous lettings form name" do
        expect(form_handler.form_name_from_start_year(2020, "lettings")).to eq("previous_lettings")
      end

      it "returns the correct next lettings form name" do
        expect(form_handler.form_name_from_start_year(2022, "lettings")).to eq("next_lettings")
      end

      it "returns the correct current sales form name" do
        expect(form_handler.form_name_from_start_year(2021, "sales")).to eq("current_sales")
      end

      it "returns the correct previous sales form name" do
        expect(form_handler.form_name_from_start_year(2020, "sales")).to eq("previous_sales")
      end

      it "returns the correct next sales form name" do
        expect(form_handler.form_name_from_start_year(2022, "sales")).to eq("next_sales")
      end
    end
  end

  it "loads the form once at boot time" do
    form_handler = described_class.instance
    expect(Form).not_to receive(:new).with(:any, "current_sales")
    expect(form_handler.get_form("current_sales")).to be_a(Form)
  end

  it "correctly sets form type and start year" do
    form = form_handler.forms["current_lettings"]
    expect(form.type).to eq("lettings")
    expect(form.start_date.year).to eq(2022)
  end
end