stats!

app/assets/stylesheets/application.tailwind.css

@@ -78,3 +78,11 @@ select {
     @apply block;
   }
 }
+.conference-stats {
+  ul {
+    @apply list-disc list-inside;
+    li {
+      @apply ml-6;
+    }
+  }
+}
\ No newline at end of file

app/controllers/conferences_controller.rb

@@ -19,4 +19,25 @@ class ConferencesController < ApplicationController
 
   def update
   end
+
+  def stats
+    @conference = Conference.find_by(slug: params[:slug])
+    @relevant_stages = @conference.relevant_stages
+    @relevant_sessions = @conference.sessions.includes(:stage, :assignments, :speakers, assignments: :user).where(stage: @conference.relevant_stages).order(:starts_at)
+    @assignees = @relevant_sessions.map(&:assignments).flatten.map(&:user).uniq
+    @language_stats = @relevant_sessions.group_by { |s| s.language }.transform_values(&:count)
+    @speakers = @relevant_sessions.map(&:speakers)
+    @unique_speakers = @speakers.flatten.uniq.count
+    @speakers_per_session = @speakers.map(&:count).sum.to_f / @speakers.size.to_f
+    @day_stats = @relevant_sessions.group_by { |s| s.starts_at.to_date }.transform_values do |se|
+      {
+        starts_at: se.first.starts_at,
+        ends_at: se.last.ends_at,
+        sessions_count: se.count,
+        wall_clock_time_min: (se.last.ends_at - se.first.starts_at) / 60.0,
+        scheduled_time_min: se.map { |x| (x.ends_at - x.starts_at) / 60.0 }.sum
+      }
+    end
+    @total_stats = @day_stats.values.inject { |m, x| m.merge(x) { |k, o, n| o + n } }.slice(:sessions_count, :wall_clock_time_min, :scheduled_time_min)
+  end
 end

app/views/conferences/stats.html.erb

+<div>
+  <h1>Statistics for <%= @conference.name %></h1>
+  <div class="conference-stats">
+    <ul>
+      <li><%= @assignees.count %> interpreters
+        <ul>
+          <% @assignees.each do |u| %>
+            <li><%= u.name %></li>
+          <% end %>
+        </ul>
+      </li>
+      <li><%= @relevant_stages.count %> stages</li>
+      <li><%= @day_stats.keys.count %> days
+        <ul>
+          <% @day_stats.each do |day, stats| %>
+            <li><%= day.strftime('%a %b, %Y') %>:
+              <%= stats[:starts_at].strftime('%H:%M') %>&ndash;<%= stats[:ends_at].strftime('%H:%M') %>,
+              <%= stats[:wall_clock_time_min].round %> minutes wall clock time (<%= (stats[:wall_clock_time_min] / 60.0).round(2) %> hours),
+              <%= stats[:scheduled_time_min].round %> minutes scheduled (<%= (stats[:scheduled_time_min] / 60.0).round(2) %> hours) in <%= stats[:sessions_count] %> sessions
+            </li>
+          <% end %>
+        </ul>
+      </li>
+      <li><%= @relevant_sessions.count %> sessions
+        <ul>
+          <% @language_stats.each do |language, cnt| %>
+            <li><%= cnt %> with language <%= language %></li>
+          <% end %>
+        </ul>
+      </li>
+      <li><%= @unique_speakers %> unique speakers
+        <ul>
+          <li>ø <%= @speakers_per_session %> speakers per session</li>
+        </ul>
+      </li>
+      <li><%= @total_stats[:scheduled_time_min] %> minutes of sessions (<%= (@total_stats[:scheduled_time_min] / 60.0).round(2) %> hours) scheduled total</li>
+    </ul>
+  </div>
+</div>

config/routes.rb

@@ -21,7 +21,8 @@ Rails.application.routes.draw do
   root "conferences#index"
 
   resources :conferences, param: :slug do
-    get ':date', action: :show, on: :member, as: :date
+    get 'stats', on: :member
+    get ':date', action: :show, on: :member, as: :date, date: /\d{4}-\d{2}-\d{2}/
     resources :sessions, param: :ref_id do
       resources :assignments, only: [:create, :destroy]
     end