BathHacked/energy-sparks

module Schools
  module Advice
    class BaseloadController < AdviceBaseController
      before_action :load_dashboard_alerts, only: [:insights, :analysis]

      def insights
        @analysis_dates = analysis_dates
        @current_baseload = current_baseload
        @benchmarked_baseload = baseload_service.benchmark_baseload
        @saving_through_1_kw_reduction_in_baseload = baseload_service.saving_through_1_kw_reduction_in_baseload
      end

      def analysis
        @meters = options_for_meter_select
        @analysis_dates = analysis_dates

        @multiple_meters = baseload_service.multiple_electricity_meters?
        @average_baseload_kw = baseload_service.average_baseload_kw
        @average_baseload_kw_benchmark = baseload_service.average_baseload_kw_benchmark
        @baseload_usage = baseload_service.annual_baseload_usage
        @benchmark_usage = baseload_service.baseload_usage_benchmark
        @estimated_savings_vs_benchmark = baseload_service.estimated_savings(versus: :benchmark_school)
        @estimated_savings_vs_exemplar = baseload_service.estimated_savings(versus: :exemplar_school)
        @annual_average_baseloads = baseload_service.annual_average_baseloads
        if @multiple_meters
          @baseload_meter_breakdown = baseload_service.baseload_meter_breakdown
          @baseload_meter_breakdown_total = baseload_service.meter_breakdown_table_total
          @date_ranges_by_meter = baseload_service.date_ranges_by_meter
        end

        # need at least a years worth of data for this analysis
        if @analysis_dates.one_years_data?
          @seasonal_variation = baseload_service.seasonal_variation
          @seasonal_variation_by_meter = baseload_service.seasonal_variation_by_meter
          @intraweek_variation = baseload_service.intraweek_variation
          @intraweek_variation_by_meter = baseload_service.intraweek_variation_by_meter
        end
      end

      private

      def aggregate_meter
        @aggregate_meter ||= aggregate_school.aggregated_electricity_meters
      end

      def aggregate_meter_adapter
        OpenStruct.new(
          mpan_mprn: aggregate_meter.mpan_mprn.to_s,
          display_name: I18n.t("advice_pages.#{advice_page_key}.analysis.meter_breakdown.whole_school")
        )
      end

      def options_for_meter_select
        [aggregate_meter_adapter] + @school.meters.active.electricity.sort_by(&:mpan_mprn)
      end

      def set_economic_tariffs_change_caveats
        @economic_tariffs_change_caveats = build_economic_tariffs_change_caveats
      end

      def build_economic_tariffs_change_caveats
        Costs::EconomicTariffsChangeCaveatsService.new(
          meter_collection: aggregate_school, fuel_type: @advice_page.fuel_type.to_sym
        ).calculate_economic_tariff_changed
      end

      def create_analysable
        baseload_service
      end

      def current_baseload
        average_baseload_kw_last_year = baseload_service.average_baseload_kw(period: :year)
        average_baseload_kw_last_week = baseload_service.average_baseload_kw(period: :week)

        previous_year_average_baseload_kw = baseload_service.previous_period_average_baseload_kw(period: :year)

        previous_week_average_baseload_kw = baseload_service.previous_period_average_baseload_kw(period: :week)

        OpenStruct.new(
          average_baseload_kw_last_week: average_baseload_kw_last_week,
          average_baseload_kw_last_year: average_baseload_kw_last_year,
          percentage_change_year: relative_percent(previous_year_average_baseload_kw, average_baseload_kw_last_year),
          percentage_change_week: relative_percent(previous_week_average_baseload_kw, average_baseload_kw_last_week)
        )
      end

      def baseload_service
        @baseload_service ||= Schools::Advice::BaseloadService.new(@school, aggregate_school)
      end

      def advice_page_key
        :baseload
      end
    end
  end
end