require "rails_helper"

RSpec.describe Csv::LettingsLogCsvService do
  before do
    Timecop.freeze(now)
    Singleton.__init__(FormHandler)
    FormHandler.instance.use_real_forms!
    log.irproduct = 1
    log.save!(validate: false)
  end

  after do
    Timecop.return
  end

  context "when downloading a csv" do
    let(:form_handler_mock) { instance_double(FormHandler) }
    let(:organisation) { create(:organisation) }
    let(:fixed_time) { Time.zone.local(2023, 11, 26) }
    let(:now) { Time.zone.now }
    let(:log) do
      create(
        :lettings_log,
        :completed,
        startdate: fixed_time,
        created_at: fixed_time,
        updated_at: now,
        mrcdate: fixed_time - 1.day,
        voiddate: fixed_time - 2.days,
        propcode: "ABCDEFG",
        tenancycode: "HIJKLMN",
        postcode_full: "NW9 5LL",
        ppostcode_full: "TN23 6LZ",
        created_by: user,
        managing_organisation: organisation,
        hhmemb: 4,
        details_known_3: 1,
        details_known_4: 0,
        sex4: "R",
        ecstat4: 10,
        relat4: "R",
        age4_known: 1,
        incref: 0,
        address_line1_as_entered: "address line 1 as entered",
        address_line2_as_entered: "address line 2 as entered",
        town_or_city_as_entered: "town or city as entered",
        county_as_entered: "county as entered",
        postcode_full_as_entered: "AB1 2CD",
        la_as_entered: "la as entered",
      )
    end
    let(:user) { create(:user, :support, email: "s.port@jeemayle.com") }
    let(:service) { described_class.new(user:, export_type:) }
    let(:export_type) { "labels" }
    let(:csv) { CSV.parse(service.prepare_csv(LettingsLog.where(id: logs.map(&:id)))) }
    let(:logs) { [log] }
    let(:headers) { csv.first }

    it "calls the form handler to get all questions in order when initialized" do
      allow(FormHandler).to receive(:instance).and_return(form_handler_mock)
      allow(form_handler_mock).to receive(:ordered_lettings_questions_for_all_years).and_return([])
      service
      expect(form_handler_mock).to have_received(:ordered_lettings_questions_for_all_years)
    end

    it "returns a string" do
      result = service.prepare_csv(LettingsLog.all)
      expect(result).to be_a String
    end

    it "returns a csv with headers" do
      expect(csv.first.first).to eq "id"
    end

    context "when stubbing :ordered_lettings_questions_for_all_years" do
      let(:lettings_form) do
        FormFactory.new(year: 2050, type: "lettings")
                  .with_sections([build(:section, :with_questions, question_ids:, questions:)])
                  .build
      end
      let(:question_ids) { nil }
      let(:questions) { nil }

      before do
        allow(FormHandler).to receive(:instance).and_return(form_handler_mock)
        allow(form_handler_mock).to receive(:form_name_from_start_year)
        allow(form_handler_mock).to receive(:get_form).and_return(lettings_form)
        allow(form_handler_mock).to receive(:ordered_lettings_questions_for_all_years).and_return(lettings_form.questions)
        allow(form_handler_mock).to receive(:lettings_in_crossover_period?).and_return false
      end

      context "when it returns questions with particular ids" do
        let(:question_ids) { %w[prevten startdate brent rent_type] }

        it "includes log attributes related to questions to the headers" do
          expect(headers).to include(*question_ids.first(3))
        end

        it "removes some log attributes related to questions from the headers and replaces them with their derived values in the correct order" do
          expect(headers).not_to include "rent_type"
          expect(headers).to include(*%w[wrent renttype renttype_detail])
          expect(headers).not_to include("rent_type_detail")
        end
      end

      context "when it returns checkbox questions" do
        let(:questions) do
          [
            build(:question, id: "condition_effects", type: "checkbox", answer_options: { "illness_type_1" => {}, "illness_type_2" => {}, "illness_type_3" => {} }),
            build(:question, id: "letting_allocation", type: "checkbox", answer_options: { "cbl" => {}, "cap" => {}, "chr" => {}, "accessible_register" => {} }),
          ]
        end

        it "does not add the id of the checkbox question to the headers" do
          question_ids = questions.map(&:id)
          expect(headers).not_to include(*question_ids)
        end

        it "adds the related log attributes from the answer options to the headers" do
          log_attributes = questions.flat_map { |q| q.answer_options.keys }
          expect(headers).to include(*log_attributes)
        end
      end
    end

    it "adds log attributes not related to questions to the headers" do
      expect(headers.first(5)).to eq %w[id status duplicate_set_id created_by is_dpo]
    end

    it "adds attributes related to associated schemes and locations to the headers" do
      expect(headers).to include(*%w[scheme_service_name scheme_sensitive SCHTYPE scheme_registered_under_care_act])
      expect(headers.last(5)).to eq %w[location_units location_type_of_unit location_mobility_type location_local_authority location_startdate]
    end

    context "when there are many logs" do
      let(:logs) { create_list(:lettings_log, log_count) }
      let(:log_count) { 30 }

      it "creates a CSV with the correct number of logs" do
        expected_row_count_with_headers = log_count + 1
        expect(csv.size).to be expected_row_count_with_headers
      end
    end

    context "when exporting with human readable labels" do
      let(:export_type) { "labels" }

      it "gives answer to radio questions as labels" do
        relat2_column_index = csv.first.index("relat2")
        relat2_value = csv.second[relat2_column_index]
        expect(relat2_value).to eq "Partner"
      end

      it "gives answers to free input questions as the user input" do
        age1_column_index = csv.first.index("age1")
        age1_value = csv.second[age1_column_index]
        expect(age1_value).to eq 35.to_s
      end

      it "exports the code for the local authority under the heading 'la'" do
        la_column_index = csv.first.index("la")
        la_value = csv.second[la_column_index]
        expect(la_value).to eq "E09000003"
      end

      it "exports the label for the local authority under the heading 'la_label'" do
        la_label_column_index = csv.first.index("la_label")
        la_label_value = csv.second[la_label_column_index]
        expect(la_label_value).to eq "Barnet"
      end

      context "when the current form is 2024" do
        let(:now) { Time.zone.local(2024, 4, 1) }

        context "and the log is for 2024 collection period" do
          let(:fixed_time) { Time.zone.local(2024, 4, 1) }

          before do
            log.update!(national: nil)
            log.update!(nationality_all: 36)
          end

          it "exports the CSV with 2024 ordering and all values correct" do
            expected_content = CSV.read("spec/fixtures/files/lettings_log_csv_export_labels_24.csv")
            values_to_delete = %w[id vacdays]
            values_to_delete.each do |attribute|
              index = csv.first.index(attribute)
              csv.second[index] = nil
            end
            expect(csv).to eq expected_content
          end
        end

        context "and the log is for 2023 collection period" do
          it "exports the CSV with 2024 ordering and all values correct" do
            expected_content = CSV.read("spec/fixtures/files/lettings_log_csv_export_labels_23_during_24_period.csv")
            values_to_delete = %w[id vacdays]
            values_to_delete.each do |attribute|
              index = csv.first.index(attribute)
              csv.second[index] = nil
            end
            expect(csv).to eq expected_content
          end
        end
      end

      context "when the current form is 2023" do
        let(:now) { Time.zone.local(2023, 11, 26) }

        it "exports the CSV with 2023 ordering and all values correct" do
          expected_content = CSV.read("spec/fixtures/files/lettings_log_csv_export_labels_23.csv")
          values_to_delete = %w[id vacdays]
          values_to_delete.each do |attribute|
            index = csv.first.index(attribute)
            csv.second[index] = nil
          end
          expect(csv).to eq expected_content
        end
      end

      context "when the log has a duplicate log reference" do
        before do
          log.update!(duplicate_set_id: 12_312)
        end

        it "exports the id for under the heading 'duplicate_set_id'" do
          duplicate_set_id_column_index = csv.first.index("duplicate_set_id")
          duplicate_set_id_value = csv.second[duplicate_set_id_column_index]
          expect(duplicate_set_id_value).to eq "12312"
        end
      end
    end

    context "when exporting as codes" do
      let(:export_type) { "codes" }

      it "gives answer to radio questions as labels" do
        relat2_column_index = csv.first.index("relat2")
        relat2_value = csv.second[relat2_column_index]
        expect(relat2_value).to eq "P"
      end

      it "gives answers to free input questions as the user input" do
        age1_column_index = csv.first.index("age1")
        age1_value = csv.second[age1_column_index]
        expect(age1_value).to eq 35.to_s
      end

      it "exports the code for the local authority under the heading 'la'" do
        la_column_index = csv.first.index("la")
        la_value = csv.second[la_column_index]
        expect(la_value).to eq "E09000003"
      end

      it "exports the label for the local authority under the heading 'la_label'" do
        la_label_column_index = csv.first.index("la_label")
        la_label_value = csv.second[la_label_column_index]
        expect(la_label_value).to eq "Barnet"
      end

      context "when the current form is 2024" do
        let(:now) { Time.zone.local(2024, 4, 1) }

        it "exports the CSV with all values correct" do
          expected_content = CSV.read("spec/fixtures/files/lettings_log_csv_export_codes_24.csv")
          values_to_delete = %w[id vacdays]
          values_to_delete.each do |attribute|
            index = csv.first.index(attribute)
            csv.second[index] = nil
          end
          expect(csv).to eq expected_content
        end
      end

      context "when the current form is 2023" do
        let(:now) { Time.zone.local(2023, 11, 26) }

        it "exports the CSV with all values correct" do
          expected_content = CSV.read("spec/fixtures/files/lettings_log_csv_export_codes_23.csv")
          values_to_delete = %w[id vacdays]
          values_to_delete.each do |attribute|
            index = csv.first.index(attribute)
            csv.second[index] = nil
          end
          expect(csv).to eq expected_content
        end
      end

      context "when the log has a duplicate log reference" do
        before do
          log.update!(duplicate_set_id: 12_312)
        end

        it "exports the id for under the heading 'duplicate_set_id'" do
          duplicate_set_id_column_index = csv.first.index("duplicate_set_id")
          duplicate_set_id_value = csv.second[duplicate_set_id_column_index]
          expect(duplicate_set_id_value).to eq "12312"
        end
      end
    end

    context "when the user is not a support user" do
      let(:user) { create(:user, email: "choreographer@owtluk.com") }

      it "does not include certain attributes in the headers" do
        expect(headers).not_to include(*%w[wrent wscharge wpschrge wsupchrg wtcharge])
      end

      context "and the current form is 2024" do
        let(:now) { Time.zone.local(2024, 4, 1) }

        context "and exporting with labels" do
          let(:export_type) { "labels" }

          it "exports the CSV with all values correct" do
            expected_content = CSV.read("spec/fixtures/files/lettings_log_csv_export_non_support_labels_24.csv")
            values_to_delete = %w[id]
            values_to_delete.each do |attribute|
              index = csv.first.index(attribute)
              csv.second[index] = nil
            end
            expect(csv).to eq expected_content
          end
        end

        context "and exporting values as codes" do
          let(:export_type) { "codes" }

          it "exports the CSV with all values correct" do
            expected_content = CSV.read("spec/fixtures/files/lettings_log_csv_export_non_support_codes_24.csv")
            values_to_delete = %w[id]
            values_to_delete.each do |attribute|
              index = csv.first.index(attribute)
              csv.second[index] = nil
            end
            expect(csv).to eq expected_content
          end
        end
      end

      context "and the current form is 2023" do
        let(:now) { Time.zone.local(2023, 11, 26) }

        context "and exporting with labels" do
          let(:export_type) { "labels" }

          it "exports the CSV with all values correct" do
            expected_content = CSV.read("spec/fixtures/files/lettings_log_csv_export_non_support_labels_23.csv")
            values_to_delete = %w[id]
            values_to_delete.each do |attribute|
              index = csv.first.index(attribute)
              csv.second[index] = nil
            end
            expect(csv).to eq expected_content
          end
        end

        context "and exporting values as codes" do
          let(:export_type) { "codes" }

          it "exports the CSV with all values correct" do
            expected_content = CSV.read("spec/fixtures/files/lettings_log_csv_export_non_support_codes_23.csv")
            values_to_delete = %w[id]
            values_to_delete.each do |attribute|
              index = csv.first.index(attribute)
              csv.second[index] = nil
            end
            expect(csv).to eq expected_content
          end
        end
      end
    end
  end
end