module Dese
  class Loader
    @memo = Hash.new
    @hits = 0
    @misses = 0
    def self.load_data(filepath:)
      admin_data_values = []
      CSV.parse(File.read(filepath), headers: true) do |row|
        score = likert_score(row:)
        next unless valid_likert_score(likert_score: score)

        admin_data_values << create_admin_data_value(row:, score:)
      end

      AdminDataValue.import(admin_data_values.flatten.compact, batch_size: 1_000, on_duplicate_key_update: :all)
      # puts "Cache Hits: #{@hits}\nCache Misses: #{@misses}\n"
    end

    private

    def self.valid_likert_score(likert_score:)
      likert_score >= 1 && likert_score <= 5
    end

    def self.likert_score(row:)
      likert_score = (row["Likert Score"] || row["LikertScore"] || row["Likert_Score"]).to_f
      likert_score.round_up_to_one.round_down_to_five
    end

    def self.ay(row:)
      row["Academic Year"] || row["AcademicYear"]
    end

    def self.dese_id(row:)
      row["DESE ID"] || row["Dese ID"] || row["Dese Id"] || row["School ID"]
    end

    def self.admin_data_item(row:)
      row["Admin Data Item"] || row["Item ID"] || row["Item Id"] || row["Item  ID"]
    end

    def self.create_admin_data_value(row:, score:)
      # get school from @memo, if not then add it to @memo
      @memo["school"+dese_id(row:)] ||= School.find_by_dese_id(dese_id(row:).to_i)
      school = @memo["school"+dese_id(row:)]
      # the same stuff again for admin data item
      admin_data_item_id = admin_data_item(row:)
      @memo["admin"+admin_data_item_id] ||= AdminDataItem.find_by_admin_data_item_id(admin_data_item_id)
      admin_data_item = @memo["admin"+admin_data_item_id]
      # get academic year from @memo, if not add it to @memo
      @memo["year"+ay(row:)] ||= AcademicYear.find_by_range(ay(row:))
      academic_year = @memo["year"+ay(row:)]

      return if school.nil?
      return if admin_data_item_id.nil? || admin_data_item_id.blank?

      admin_data_value = AdminDataValue.find_by(academic_year:, school:, admin_data_item:)

      if admin_data_value.present?
        admin_data_value.likert_score = score
        admin_data_value.save
        nil
      else
        AdminDataValue.new(
          likert_score: score,
          academic_year:,
          school:,
          admin_data_item:,
        )
      end
    end

    private_class_method :valid_likert_score
    private_class_method :likert_score
    private_class_method :ay
    private_class_method :dese_id
    private_class_method :admin_data_item
    private_class_method :create_admin_data_value
  end
end