dirty commit: can't get references to work correctly between any tables

app/presenters/dashboard/variance_chart_row_presenter.rb

@@ -0,0 +1,118 @@
+# frozen_string_literal: true
+
+module Dashboard
+  class VarianceChartRowPresenter
+    include Comparable
+
+    attr_reader :score, :measure_name, :measure_id, :category
+
+    def initialize(measure:, score:)
+      @measure = measure
+      @score = score.average
+      @meets_teacher_threshold = score.meets_teacher_threshold?
+      @meets_student_threshold = score.meets_student_threshold?
+      @measure_name = @measure.name
+      @measure_id = @measure.measure_id
+      @category = @measure.subcategory.category
+    end
+
+    def sufficient_data?
+      @score != nil
+    end
+
+    def bar_color
+      "fill-#{zone.type}"
+    end
+
+    def bar_width
+      "#{(bar_width_percentage * 100).round(2)}%"
+    end
+
+    def x_offset
+      case zone.type
+      when :ideal, :approval
+        "60%"
+      else
+        "#{((0.6 - bar_width_percentage) * 100).abs.round(2)}%"
+      end
+    end
+
+    def order
+      case zone.type
+      when :ideal, :approval
+        bar_width_percentage
+      when :warning, :watch, :growth
+        -bar_width_percentage
+      when :insufficient_data
+        -100
+      end
+    end
+
+    def <=>(other)
+      other.order <=> order
+    end
+
+    def show_partial_data_indicator?
+      partial_data_sources.present?
+    end
+
+    def partial_data_sources
+      [].tap do |sources|
+        sources << "teacher survey results" if @measure.includes_teacher_survey_items? && !@meets_teacher_threshold
+        sources << "student survey results" if @measure.includes_student_survey_items? && !@meets_student_threshold
+        sources << "administrative data" if @measure.includes_admin_data_items?
+      end
+    end
+
+    private
+
+    IDEAL_ZONE_WIDTH_PERCENTAGE = 0.2
+    APPROVAL_ZONE_WIDTH_PERCENTAGE = 0.2
+    GROWTH_ZONE_WIDTH_PERCENTAGE = 0.2
+    WATCH_ZONE_WIDTH_PERCENTAGE = 0.2
+    WARNING_ZONE_WIDTH_PERCENTAGE = 0.2
+
+    def bar_width_percentage
+      send("#{zone.type}_bar_width_percentage")
+    end
+
+    def ideal_bar_width_percentage
+      percentage * IDEAL_ZONE_WIDTH_PERCENTAGE + APPROVAL_ZONE_WIDTH_PERCENTAGE
+    end
+
+    def approval_bar_width_percentage
+      percentage * APPROVAL_ZONE_WIDTH_PERCENTAGE
+    end
+
+    def growth_bar_width_percentage
+      (1 - percentage) * GROWTH_ZONE_WIDTH_PERCENTAGE
+    end
+
+    def watch_bar_width_percentage
+      (1 - percentage) * WATCH_ZONE_WIDTH_PERCENTAGE + GROWTH_ZONE_WIDTH_PERCENTAGE
+    end
+
+    def warning_bar_width_percentage
+      (1 - percentage) * WARNING_ZONE_WIDTH_PERCENTAGE + WATCH_ZONE_WIDTH_PERCENTAGE + GROWTH_ZONE_WIDTH_PERCENTAGE
+    end
+
+    def insufficient_data_bar_width_percentage
+      0
+    end
+
+    def percentage
+      low_benchmark = zone.low_benchmark
+      (@score - low_benchmark) / (zone.high_benchmark - low_benchmark)
+    end
+
+    def zone
+      zones = Zones.new(
+        watch_low_benchmark: @measure.watch_low_benchmark,
+        growth_low_benchmark: @measure.growth_low_benchmark,
+        approval_low_benchmark: @measure.approval_low_benchmark,
+        ideal_low_benchmark: @measure.ideal_low_benchmark
+      )
+      zones.zone_for_score(@score)
+    end
+  end
+end