feat: Dr. Rai Statins Indicator (#5644)

**Story card:**
[sc-16076](https://app.shortcut.com/simpledotorg/story/16076/dr-rai-statins-indicator)

## Because

Statins Indicator is the final indicator of the set we choose to launch
with. This indicator has SQL as its datasource — as opposed to the data
in the Dashboard.

## This addresses

- Leveraging the mechanism to use SQL queries as a datasource (from
#5643); upgrading assumptions where necessary
- Creating the Statins Indicator (alongside its query)
- Adding the Statins Indicator to the Dr. Rai component
- Smoothening out component decisions

## Test instructions

suite tests

Author: igbanam

.github/CODEOWNERS

@@ -6,6 +6,9 @@
 
 /config/data/medications.yml @harimohanraj89
 
+# Igbanam's
+*dr_rai* @igbanam
+
 # See docs and examples for this file at
 
 # https://docs.github.com/en/github/creating-cloning-and-archiving-repositories/about-code-owners

app/assets/stylesheets/dr_rai.scss

@@ -314,15 +314,27 @@ $font-condensed: "Roboto Condensed", sans-serif;
   .link-button {
     background-color: transparent;
     border: none;
-    color: #007eff;
-    cursor: pointer;
     font-size: 16px;
     padding: 5px 0px;
     text-align: left;
 
-    &:hover {
-      text-decoration: underline;
-      text-underline-offset: 3px;
+    &-active {
+      cursor: pointer;
+      color: #007eff;
+
+      &:hover {
+        text-decoration: underline;
+        text-underline-offset: 3px;
+      }
+    }
+
+    &-inactive {
+      color: #8cc5ff;
+      cursor: not-allowed;
+
+      &:hover {
+        text-decoration: none;
+      }
     }
   }
 

app/components/dashboard/dr_rai_report.html.erb

@@ -74,7 +74,7 @@
           <%# <button class="link-button edit">Edit</button> %>
           <ul>
             <% indicators.each do |indicator| %>
-              <li><button class="link-button advancer" data-target-type="<%= indicator.target_type %>" data-target-ui="<%= indicator.target_type_frontend %>" data-indicator-id=<%= indicator.id %> data-indicator-denominator="<%= indicator_denominator(indicator) %>" data-indicator-previous-numerator="<%= indicator_previous_numerator(indicator) %>" data-indicator-action="<%= indicator.action %>" data-indicator-action-active="<%= indicator.action_active %>" data-indicator-action-passive="<%= indicator.action_passive %>" data-indicator-unit="<%= indicator.unit %>"><%= indicator.display_name %></button></li>
+              <li><button role="button" class="link-button advancer <%= indicator.has_action_plans? ? "link-button-inactive" : "link-button-active" %>" <%= "disabled" if indicator.has_action_plans? %> data-target-type="<%= indicator.target_type %>" data-target-ui="<%= indicator.target_type_frontend %>" data-indicator-id=<%= indicator.id %> data-indicator-denominator="<%= indicator_denominator(indicator) %>" data-indicator-previous-numerator="<%= indicator_previous_numerator(indicator) %>" data-indicator-action="<%= indicator.action %>" data-indicator-action-active="<%= indicator.action_active %>" data-indicator-action-passive="<%= indicator.action_passive %>" data-indicator-unit="<%= indicator.unit %>"><%= indicator.display_name %></button></li>
             <% end %>
           </ul>
         </div>

app/components/dashboard/dr_rai_report.rb

@@ -1,6 +1,6 @@
 # Root component for Dr. Rai Reports
 class Dashboard::DrRaiReport < ApplicationComponent
-  attr_reader :quarterlies, :indicators, :region, :action_plans
+  attr_reader :quarterlies, :region
   attr_accessor :selected_period
 
   def initialize(quarterlies, region_slug, selected_quarter = nil, lite = false)
@@ -12,21 +12,31 @@ def initialize(quarterlies, region_slug, selected_quarter = nil, lite = false)
     else
       Period.new(type: :quarter, value: selected_quarter)
     end
-    @action_plans = DrRai::ActionPlan
+  end
+
+  def indicators
+    @indicators ||= custom_indicators
+  end
+
+  def action_plans
+    @action_plans ||= DrRai::ActionPlan
       .includes(:dr_rai_target)
       .where(
         region: @region,
         dr_rai_target: {period: @selected_period.value.to_s}
       )
-    @indicators = custom_indicators
+  end
+
+  def existing_indicators
+    action_plans.map { |ap| ap.indicator.type }
   end
 
   def custom_indicators
     return nil if @lite
     return [] unless region.source_type == "Facility"
-    DrRai::Indicator.all.filter do |indicator|
-      indicator.is_supported?(region)
-    end
+    DrRai::Indicator
+      .all
+      .filter { |indicator| indicator.is_supported?(region) }
   end
 
   def indicator_previous_numerator(indicator)

app/models/dr_rai/data/statin.rb

@@ -0,0 +1,9 @@
+class DrRai::Data::Statin < ApplicationRecord
+  include DrRai::Chartable
+
+  default_scope { where(month_date: 1.year.ago..Date.today) }
+
+  chartable_internal_keys :eligible_patients, :patients_prescribed_statins
+  chartable_period_key :month_date
+  chartable_outer_grouping :aggregate_root
+end

app/models/dr_rai/indicator.rb

@@ -29,25 +29,36 @@ def period
     Period.new(type: :quarter, value: target.period)
   end
 
+  def has_action_plans?
+    @region_exists ||= DrRai::ActionPlan
+      .joins(:dr_rai_indicator)
+      .where(dr_rai_indicator: {type: type})
+      .exists?
+  end
+
   def target_type
     DrRai::Target::TYPES[target_type_frontend]
   end
 
   def numerator(region, the_period = period)
+    0 unless is_supported?(region)
     numerators(region)[the_period]
   end
 
   def denominator(region, the_period = period)
+    0 unless is_supported?(region)
     denominators(region)[the_period]
   end
 
   def numerators(region)
+    [] unless is_supported?(region)
     datasource(region).map do |t, data|
       [t, data[numerator_key]]
     end.to_h
   end
 
   def denominators(region)
+    [] unless is_supported?(region)
     datasource(region).map do |t, data|
       [t, data[denominator_key]]
     end.to_h

app/models/dr_rai/statins_indicator.rb

@@ -0,0 +1,51 @@
+module DrRai
+  class StatinsIndicator < Indicator
+    attr_reader :region
+
+    def datasource(region)
+      @region = region
+      @query ||= DrRai::Data::Statin.chartable
+      if @query.key? region.name
+        @query[region.name]
+      else
+        @query[region.slug]
+      end
+    end
+
+    def display_name
+      "Statins"
+    end
+
+    def target_type_frontend
+      "percent"
+    end
+
+    def numerator_key
+      :patients_prescribed_statins
+    end
+
+    def denominator_key
+      :eligible_patients
+    end
+
+    def unit
+      "patients"
+    end
+
+    def action_passive
+      "prescribed statins"
+    end
+
+    def action_active
+      "Prescribe statins for"
+    end
+
+    def percentage
+      raise "Unimplemented"
+    end
+
+    def is_supported?(region)
+      @is_supported ||= (datasource(region).present? && true)
+    end
+  end
+end

app/models/dr_rai/titration_indicator.rb

@@ -37,7 +37,7 @@ def unit
     end
 
     def is_supported?(region)
-      case CountryConfig.current[:name]
+      @is_supported ||= case CountryConfig.current[:name]
       when "Bangladesh"
         region.path.split(".").include?("nhf")
       when "Ethiopia"

app/queries/dr_rai/indicator_function.rb

@@ -17,6 +17,8 @@ def for klazz, from: nil, to: nil
 
         if klazz <= Data::Titration
           instance = DrRai::TitrationQueryFactory.new(from, to)
+        elsif klazz <= Data::Statin
+          instance = DrRai::StatinsQueryFactory.new(from, to)
         else
           raise "Unsupported"
         end
@@ -51,6 +53,10 @@ def updater
       raise "Unimplemented"
     end
 
+    def months_between
+      (@to_date.year * 12 + @to_date.month) - (@from_date.year * 12 + @from_date.month)
+    end
+
     private
 
     def set_date_boundaries!