Route, action, policy, and view for lottery calculations

app/controllers/lotteries_controller.rb

@@ -63,6 +63,11 @@ def destroy
     end
   end
 
+  # GET /organizations/:organization_id/lotteries/:id/calculations
+  def calculations
+    @presenter = LotteryCalculationsPresenter.new(@lottery, view_context)
+  end
+
   # GET /organizations/:organization_id/lotteries/:id/draw_tickets
   def draw_tickets
     @presenter = LotteryPresenter.new(@lottery, view_context)

app/models/lotteries/calculations/hardrock_2025.rb

@@ -3,6 +3,12 @@
 class Lotteries::Calculations::Hardrock2025 < ApplicationRecord
   self.table_name = :lotteries_calculations_hardrock_2025s
 
+  enum gender: {
+    male: 0,
+    female: 1,
+    nonbinary: 2,
+  }
+
   belongs_to :organization
   belongs_to :person
 end

app/policies/lottery_policy.rb

@@ -57,6 +57,10 @@ def export_entrants?
     user.authorized_for_lotteries?(organization)
   end
 
+  def calculations?
+    user.authorized_for_lotteries?(organization)
+  end
+
   def draw?
     user.authorized_for_lotteries?(organization)
   end

app/presenters/lottery_calculations_presenter.rb

@@ -0,0 +1,61 @@
+# frozen_string_literal: true
+
+class LotteryCalculationsPresenter < LotteryPresenter
+  CalculatedGroup = Struct.new(:name, :entrants_count, :tickets_count)
+
+  delegate :calculation_class, to: :lottery
+
+  def initialize(lottery, view_context)
+    super
+    validate_setup
+  end
+
+  def division_calculations
+    @division_calculations ||=
+      lottery_calculation.group(:division).pluck(Arel.sql("division, count(*), sum(ticket_count)")).map do |row|
+        CalculatedGroup.new(*row)
+      end
+  end
+
+  def division_entrants_count
+    division_calculations.sum(&:entrants_count)
+  end
+
+  def division_tickets_count
+    division_calculations.sum(&:tickets_count)
+  end
+
+  def gender_calculations
+    @gender_calculations ||=
+      lottery_calculation.group(:gender).pluck(Arel.sql("gender, count(*), sum(ticket_count)")).map do |row|
+        CalculatedGroup.new(*row)
+      end
+  end
+
+  def gender_entrants_count
+    gender_calculations.sum(&:entrants_count)
+  end
+
+  def gender_tickets_count
+    gender_calculations.sum(&:tickets_count)
+  end
+
+  private
+
+  def calculated_division_names
+    @calculated_divisions ||= lottery_calculation.group(:division).pluck(:division)
+  end
+
+  def lottery_calculation
+    @lottery_calculation ||= lottery_calculation_class.where(organization: organization)
+  end
+
+  def lottery_calculation_class
+    "Lotteries::Calculations::#{calculation_class}".safe_constantize
+  end
+
+  def validate_setup
+    raise "Lottery must have an assigned calculation_class" unless calculation_class.present?
+    raise "Lottery calculation class does not exist" unless lottery_calculation_class.present?
+  end
+end

app/views/lotteries/_admin_tabs.html.erb

@@ -1,3 +1,5 @@
+<%# locals: (presenter:) %>
+
 <ul class="nav nav-tabs nav-tabs-ost" data-turbo="false">
   <%= content_tag :li, class: "nav-item #{'active' if presenter.action_name == 'setup'}" do %>
     <%= link_to "Setup", setup_organization_lottery_path(presenter.organization, presenter.lottery) %>
@@ -11,4 +13,9 @@
   <%= content_tag :li, class: "nav-item #{'active' if presenter.controller_name == 'partners'}" do %>
     <%= link_to "Partners", organization_lottery_partners_path(presenter.organization, presenter.lottery) %>
   <% end %>
+  <% if presenter.lottery.calculation_class? %>
+    <%= content_tag :li, class: "nav-item #{'active' if presenter.action_name == 'calculations'}" do %>
+      <%= link_to "Preview Calculations", calculations_organization_lottery_path(presenter.organization, presenter.lottery) %>
+    <% end %>
+  <% end %>
 </ul>

app/views/lotteries/calculations.html.erb

@@ -0,0 +1,124 @@
+<% content_for :title do %>
+  <% "OpenSplitTime: Lottery Calculations - #{@presenter.name}" %>
+<% end %>
+
+<%= render "lotteries/header", presenter: @presenter, breadcrumbs: ["Calculations"] %>
+
+<aside class="ost-toolbar">
+  <div class="container">
+    <%= render partial: "shared/callout_with_link",
+               locals: {
+                 callout_color: :info,
+                 icon_color: :info,
+                 icon_name: "info-circle",
+                 main_text: "This is the Lottery Calculations Preview Page",
+                 detail_paragraphs: [
+                   "Information shown here is based on Historical Facts that have been entered or imported for your organization, which are used as inputs for the query set up for this Lottery (Query class name: #{@presenter.calculation_class}).",
+                   "To view Historical Facts, click the button to the right.",
+                   "This page shows a summary of tickets and divisions that are currently being calculated for this Lottery, together with a detailed list view showing calculations for each applicant.",
+                 ],
+                 link: (button_to "Historical facts", organization_historical_facts_path(@presenter.organization), class: "btn btn-outline-secondary")
+               } %>
+    <%= render partial: "shared/callout_with_link",
+               locals: {
+                 callout_color: :warning,
+                 icon_color: :warning,
+                 icon_name: "exclamation-circle",
+                 main_text: "Note: These are not the actual Divisions and ticket counts for your Lottery",
+                 detail_paragraphs: [
+                   "Click on the Setup tab to see the Divisions and Tickets that have been set up for your Lottery. To transfer the Divisions and tickets from this Preview page to your lottery, click the button to the right.",
+                 ],
+                 link: (button_to "Accept calculations", setup_organization_lottery_path(@presenter.organization, @presenter.lottery), class: "btn btn-outline-danger")
+               } %>
+  </div>
+</aside>
+
+<article class="ost-article container">
+  <div class="row">
+    <div class="col">
+      <div class="card mt-4">
+        <div class="card-header">
+          <div class="row">
+            <div class="col">
+              <h2 class="fw-bold">By Division</h2>
+            </div>
+          </div>
+        </div>
+        <div class="card-body table-responsive">
+          <table class="table">
+            <thead>
+            <tr>
+              <th>Name</th>
+              <th class="text-center">Entrants</th>
+              <th class="text-center">%</th>
+              <th class="text-center">Tickets</th>
+              <th class="text-center">%</th>
+            </tr>
+            </thead>
+            <tbody>
+            <% @presenter.division_calculations.each do |calc| %>
+              <tr>
+                <td><%= calc.name %></td>
+                <td class="text-center"><%= calc.entrants_count %></td>
+                <th class="text-center"><%= "#{(calc.entrants_count / @presenter.division_entrants_count.to_f * 100).round(1)}%" %></th>
+                <td class="text-center"><%= calc.tickets_count %></td>
+                <th class="text-center"><%= "#{(calc.tickets_count / @presenter.division_tickets_count.to_f * 100).round(1)}%" %></th>
+              </tr>
+            <% end %>
+            <tr class="fw-bold bg-light">
+              <td>Totals</td>
+              <td class="text-center"><%= @presenter.division_entrants_count %></td>
+              <th class="text-center">100.0%</th>
+              <td class="text-center"><%= @presenter.division_tickets_count %></td>
+              <th class="text-center">100.0%</th>
+            </tr>
+            </tbody>
+          </table>
+        </div>
+      </div>
+    </div>
+
+    <div class="col">
+      <div class="card mt-4">
+        <div class="card-header">
+          <div class="row">
+            <div class="col">
+              <h2 class="fw-bold">By Gender</h2>
+            </div>
+          </div>
+        </div>
+        <div class="card-body table-responsive">
+          <table class="table">
+            <thead>
+            <tr>
+              <th>Name</th>
+              <th class="text-center">Entrants</th>
+              <th class="text-center">%</th>
+              <th class="text-center">Tickets</th>
+              <th class="text-center">%</th>
+            </tr>
+            </thead>
+            <tbody>
+            <% @presenter.gender_calculations.each do |calc| %>
+              <tr>
+                <td><%= calc.name.titleize %></td>
+                <td class="text-center"><%= calc.entrants_count %></td>
+                <th class="text-center"><%= "#{(calc.entrants_count / @presenter.gender_entrants_count.to_f * 100).round(1)}%" %></th>
+                <td class="text-center"><%= calc.tickets_count %></td>
+                <th class="text-center"><%= "#{(calc.tickets_count / @presenter.gender_tickets_count.to_f * 100).round(1)}%" %></th>
+              </tr>
+            <% end %>
+            <tr class="fw-bold bg-light">
+              <td>Totals</td>
+              <td class="text-center"><%= @presenter.gender_entrants_count %></td>
+              <th class="text-center">100.0%</th>
+              <td class="text-center"><%= @presenter.gender_tickets_count %></td>
+              <th class="text-center">100.0%</th>
+            </tr>
+            </tbody>
+          </table>
+        </div>
+      </div>
+    </div>
+  </div>
+</article>

config/routes.rb

@@ -223,6 +223,7 @@
     end
 
     resources :lotteries do
+      member { get :calculations }
       member { get :draw_tickets }
       member { get :setup }
       member { get :withdraw_entrants }