Display info about unavailable fields while editing report

Fixes https://bugzilla.redhat.com/show_bug.cgi?id=1581817

app/helpers/report_helper.rb

@@ -100,4 +100,16 @@ def filter_performance_end_options
   def chart_mode_values_allowed?
     @edit[:new][:group] != 'Counts'
   end
+
+  # Get string with unavailable fields while adding/editing report
+  def unavailable_fields_for_model(model)
+    case model
+    when 'ChargebackVm'
+      _('Cpu Cores Allocated Metric, Cpu Cores Used Metric, Fixed Compute Metric, Fixed Storage Metric')
+    when 'ChargebackContainerImage'
+      _('CPU Allocated Metric, CPU Used Metric, Disk I/O Used Metric, Fixed Compute Metric, Fixed Storage Metric, Storage Allocated Metric, Storage Used Metric')
+    when 'ChargebackContainerProject'
+      _('CPU Allocated Metric, CPU Used Metric, CPU Cores Allocated Metric, Disk I/O Used Metric, Fixed Compute Metric, Memory Allocated Metric, Fixed Storage Metric, Storage Allocated Metric, Storage Used Metric')
+    end
+  end
 end

app/views/report/_form_columns.html.haml

@@ -26,6 +26,13 @@
       = render :partial => "column_lists"
     %strong
       = _('* Caution: Changing these fields will clear all selected values below them!')
+    - unavailable_fields = unavailable_fields_for_model(@edit[:new][:model])
+    - if unavailable_fields
+      %br
+      %p{:style => "max-width: 850px;"}
+        %strong
+          = _("* Caution: %{unav_fields} are not supported for %{rep_base}.") % {:unav_fields => unavailable_fields, :rep_base => Dictionary.gettext(@edit[:new][:model], :type => :model, :notfound => :titleize, :plural => true)}
+
     %hr
       %h3
         = _('Report Creation Timeout')