sqm-dashboards/app/presenters/subcategory_presenter.rb

class SubcategoryPresenter
  def initialize(subcategory:, academic_year:, school:)
    @subcategory = subcategory
    @academic_year = academic_year
    @school = school
  end

  def id
    @subcategory.subcategory_id
  end

  def name
    @subcategory.name
  end

  def description
    @subcategory.description
  end

  def gauge_presenter
    GaugePresenter.new(scale: scale, score: average_score)
  end

  def subcategory_card_presenter
    SubcategoryCardPresenter.new(name: @subcategory.name, scale: scale, score: average_score)
  end

  def average_score
    @average_score ||= SurveyItemResponse.score_for_subcategory(subcategory: @subcategory, school: @school,
                                                                academic_year: @academic_year)
  end

  def student_response_rate
    @student_response_rate ||= response_rate(type: :total_students) do
      SurveyItemResponse.average_number_of_student_respondents(subcategory: @subcategory, school: @school,
                                                               academic_year: @academic_year)
    end
  end

  def measure_presenters
    @subcategory.measures.includes([:admin_data_items]).sort_by(&:measure_id).map do |measure|
      MeasurePresenter.new(measure: measure, academic_year: @academic_year, school: @school)
    end
  end

  private

  def scale
    Scale.new(
      watch_low_benchmark: measures.map(&:watch_low_benchmark).average,
      growth_low_benchmark: measures.map(&:growth_low_benchmark).average,
      approval_low_benchmark: measures.map(&:approval_low_benchmark).average,
      ideal_low_benchmark: measures.map(&:ideal_low_benchmark).average
    )
  end

  def measures
    @measures ||= @subcategory.measures.includes([:admin_data_items]).order(:measure_id)
  end

  def response_rate(type:)
    number_of_responses = yield
    total_responses = Respondent.where(school: @school, academic_year: @academic_year).first
    return 0 unless total_responses.present?

    total_possible_responses = total_responses.send(type)

    return 0 if number_of_responses.nil? || total_possible_responses == 0

    (number_of_responses / total_possible_responses * 100).round
  end
end