require "spec_helper"

RSpec.describe MerchCalendar::FiscalYearCalendar do
  context "the default fy_offset - 2 quarters earlier" do
    describe "#weeks_in_year" do
      it "returns 53 for a leap year - 2013" do
        expect(subject.weeks_in_year(2013)).to eq 53
      end

      it "returns 52 for a normal year" do
        expect(subject.weeks_in_year(2014)).to eq 52
      end

      it "returns 52 for a normal year" do
        expect(subject.weeks_in_year(2015)).to eq 52
      end

      it "returns 52 for a normal year" do
        expect(subject.weeks_in_year(2016)).to eq 52
      end

      it "returns 52 for a normal year" do
        expect(subject.weeks_in_year(2017)).to eq 52
      end

      it "returns 53 for a leap year - 2018" do
        expect(subject.weeks_in_year(2018)).to eq 53
      end

      it "returns 52 for a normal year" do
        expect(subject.weeks_in_year(2019)).to eq 52
      end
    end

    describe "#start_of_week" do
      it "returns the correct date for 2017-1-1 (2017-Aug-wk1)" do
        expect(subject.start_of_week(2017, 1, 1)).to eq Date.new(2016, 7, 31)
      end

      it "returns the correct Date for 2018-1-1 (2018-Aug-wk1)" do
        expect(subject.start_of_week(2018, 1, 1)).to eq Date.new(2017, 7, 30)
      end

      it "returns the correct Date for 2019-1-1 (2019-Aug-wk1)" do
        expect(subject.start_of_week(2019, 1, 1)).to eq Date.new(2018, 8, 5)
      end
    end

    describe "#end_of_week" do
      it "returns the correct date for 2017-6-1 (2017-Jan-wk1)" do
        expect(subject.end_of_week(2017, 6, 1)).to eq Date.new(2017, 1, 7)
      end

      it "returns the correct Date for 2018-6-5 (2018-Jan-wk5)" do
        expect(subject.end_of_week(2018, 6, 5)).to eq Date.new(2018, 2, 3)
      end

      it "returns the correct Date for 2019-10-3 (2019-May-wk3)" do
        expect(subject.end_of_week(2019, 10, 3)).to eq Date.new(2019, 5, 25)
      end
    end

    describe "#start_of_month" do
      it "returns the correct date for 2018-1 AKA 2018-Aug" do
        expect(subject.start_of_month(2018, 1)).to eq Date.new(2017, 7, 30)
      end

      it "returns the correct date for 2019-1 AKA 2019-Aug" do
        expect(subject.start_of_month(2019, 1)).to eq Date.new(2018, 8, 5)
      end
    end

    describe "#end_of_month" do
      it "returns the correct date for 2018-1 AKA 2018-Aug" do
        expect(subject.end_of_month(2018, 1)).to eq Date.new(2017, 8, 26)
      end

      it "returns the correct date for 2019-1 AKA 2019-Aug" do
        expect(subject.end_of_month(2019, 1)).to eq Date.new(2018, 9, 1)
      end
    end

    describe "#start_of_quarter" do
      it "returns the correct date for 2018-Q1" do
        expect(subject.start_of_quarter(2018, 1)).to eq Date.new(2017, 7, 30)
      end

      it "returns the correct date for 2018-Q4" do
        expect(subject.start_of_quarter(2018, 4)).to eq Date.new(2018, 5, 6)
      end

      it "returns the correct date for 2019-Q1" do
        expect(subject.start_of_quarter(2019, 1)).to eq Date.new(2018, 8, 5)
      end
    end

    describe "#end_of_quarter" do
      it "returns the correct date for 2018-Q1" do
        expect(subject.end_of_quarter(2018, 1)).to eq Date.new(2017, 10, 28)
      end

      it "returns the correct date for 2018-Q4" do
        expect(subject.end_of_quarter(2018, 4)).to eq Date.new(2018, 8, 4)
      end

      it "returns the correct date for 2019-Q1" do
        expect(subject.end_of_quarter(2019, 1)).to eq Date.new(2018, 11, 3)
      end
    end

    describe "#start_of_year" do
      it "returns the correct date for 2018" do
        expect(subject.start_of_year(2018)).to eq Date.new(2017, 7, 30)
      end

      it "returns the correct date for 2019" do
        expect(subject.start_of_year(2019)).to eq Date.new(2018, 8, 5)
      end
    end

    describe "#end_of_year" do
      it "returns the correct date for 2017" do
        expect(subject.end_of_year(2017)).to eq Date.new(2017, 7, 29)
      end

      it "returns the correct date for 2018" do
        expect(subject.end_of_year(2018)).to eq Date.new(2018, 8, 4)
      end

      it "returns the correct date for 2019" do
        expect(subject.end_of_year(2019)).to eq Date.new(2019, 8, 3)
      end
    end
  end

  context "an alternative offset - 2 quarters after" do
    subject { described_class.new(2) }

    it "raises a NotImplementedError - this is still TODO" do
      expect {
        subject
      }.to raise_error(NotImplementedError)
    end
  end
end