Add usage summary for each device

app/admin/app_usage.rb

@@ -28,8 +28,6 @@ ActiveAdmin.register_page "App Usage" do
           app_usage[:package_name]
         end
         column "Total Usage" do |app_usage|
-          #usage_in_minutes = app_usage[:usage]/60
-          #(usage_in_minutes > 0) ? usage_in_minutes :"Less than a minute"
           distance_of_time_in_words (app_usage[:usage])
         end
       end

app/admin/device.rb

@@ -56,6 +56,27 @@ ActiveAdmin.register Device do
       row :heartbeats_count
       row :created_at
       row :updated_at
+      total_usage = 0
+
+      panel "App Usage Details" do
+        table_for device.app_usage_summary do
+          column "Used On" do |app_usage|
+            app_usage[:used_on]
+          end
+          column "App Name" do |app_usage|
+            app_usage[:package_name]
+          end
+          column "Total Usage" do |app_usage|
+            total_usage += app_usage[:usage]
+            distance_of_time_in_words app_usage[:usage]
+          end
+        end
+      end
+      
+      row "Total Usage" do 
+        distance_of_time_in_words total_usage
+      end
+
       panel "APP INSTALL DETAILS" do
         table_for device.installations.order('updated_at desc') do
           column "App Name" do |installation|

app/models/device.rb

@@ -40,4 +40,15 @@ class Device < ActiveRecord::Base
       self.status = Device.statuses.keys[2]
     end
   end
+
+  def app_usage_summary
+    app_usage_data = []
+    self.app_usages.app_usages_per_device_app_day.each do |key,value|
+      app_usage_data << {device_id: key[0],
+                       package_name: key[1],
+                       used_on: key[2],
+                       usage: value} 
+    end
+    app_usage_data
+  end
 end