BathHacked/energy-sparks

module Schools
  class MetersController < ApplicationController
    include CsvDownloader

    load_and_authorize_resource :school
    load_and_authorize_resource through: :school

    before_action :set_breadcrumbs

    def index
      load_meters
      @meter = @school.meters.new
      @pending_reviews = meters_need_review?
      @enough_data_for_targets = enough_data_for_targets?

      respond_to do |format|
        format.html
        format.csv { send_data readings_to_csv(AmrValidatedReading.download_query_for_school(@school), AmrValidatedReading::CSV_HEADER_FOR_SCHOOL), filename: "school-amr-readings-#{@school.name.parameterize}.csv" }
      end
    end

    def show
      set_n3rgy_status
      respond_to do |format|
        format.html
        format.csv { send_data readings_to_csv(AmrValidatedReading.download_query_for_meter(@meter), AmrValidatedReading::CSV_HEADER_FOR_METER), filename: "meter-amr-readings-#{@meter.mpan_mprn}.csv" }
      end
    end

    def create
      manager = MeterManagement.new(@meter)
      if @meter.save
        manager.process_creation!
        redirect_to school_meters_path(@school)
      else
        load_meters
        render :index
      end
    end

    def edit
    end

    def update
      @meter.attributes = meter_params
      manager = MeterManagement.new(@meter)
      if @meter.save
        if @meter.mpan_mprn_previously_changed?
          manager.process_mpan_mpnr_change!
        end
        redirect_to school_meters_path(@school), notice: 'Meter updated'
      else
        render :edit
      end
    end

    def inventory
      @inventory = Meters::N3rgyMeteringService.new(@meter).inventory
      render :inventory
    rescue => e
      flash[:error] = e
      render :inventory
    end

    def deactivate
      MeterManagement.new(@meter).deactivate_meter!
      redirect_to school_meters_path(@school), notice: 'Meter deactivated'
    end

    def activate
      MeterManagement.new(@meter).activate_meter!
      redirect_to school_meters_path(@school), notice: 'Meter activated'
    end

    def destroy
      MeterManagement.new(@meter).delete_meter!
      redirect_to school_meters_path(@school)
    end

  private

    def set_n3rgy_status
      return unless can?(:view_dcc_data, @school)
      service = Meters::N3rgyMeteringService.new(@meter)
      @known_to_n3rgy = service.available?
      if @known_to_n3rgy && @meter.dcc_meter
        @n3rgy_status = service.status
        @n3rgy_consent_confirmed = service.consented?
        @available_cache_range = service.available_data if @n3rgy_consent_confirmed
      end
    end

    def set_breadcrumbs
      @breadcrumbs = [{ name: I18n.t('manage_school_menu.manage_meters') }]
    end

    def enough_data_for_targets?
      return nil unless can?(:view_target_data, @school)
      Targets::SchoolTargetService.new(@school).enough_data?
    end

    def meters_need_review?
      @school.meters.unreviewed_dcc_meter.any?
    end

    def load_meters
      @meters ||= @school.meters
      @active_meters = @meters.active.real.order(:mpan_mprn)
      @inactive_meters = @meters.inactive.real.order(:mpan_mprn)
      @active_pseudo_meters = @meters.active.pseudo.order(:mpan_mprn)
      @inactive_pseudo_meters = @meters.inactive.pseudo.order(:mpan_mprn)
      @invalid_mpan = @active_meters.select(&:electricity?).reject(&:correct_mpan_check_digit?)
    end

    def meter_params
      params.require(:meter).permit(:mpan_mprn, :meter_type, :name, :meter_serial_number, :dcc_meter, :data_source_id, :procurement_route_id, :admin_meter_statuses_id, :meter_system)
    end
  end
end