Show all system emails in Admin section

app/controllers/admin/system_emails_controller.rb

@@ -5,14 +5,35 @@ class Admin::SystemEmailsController < Admin::BaseController
   def index
     @system_emails = {
       proposal_notification_digest: %w[view preview_pending],
+      budget_investment_created:    %w[view edit_info],
+      budget_investment_selected:   %w[view edit_info],
+      budget_investment_unfeasible: %w[view edit_info],
+      budget_investment_unselected: %w[view edit_info],
+      comment:                      %w[view edit_info],
+      reply:                        %w[view edit_info],
+      direct_message_for_receiver:  %w[view edit_info],
+      direct_message_for_sender:    %w[view edit_info],
+      email_verification:           %w[view edit_info],
+      user_invite:                  %w[view edit_info]
     }
   end
 
   def view
     case @system_email
     when "proposal_notification_digest"
-      @notifications = Notification.where(notifiable_type: "ProposalNotification").limit(2)
-      @subject = t('mailers.proposal_notification_digest.title', org_name: Setting['org_name'])
+      load_sample_proposal_notifications
+    when /\Abudget_investment/
+      load_sample_investment
+    when /\Adirect_message/
+      load_sample_direct_message
+    when "comment"
+      load_sample_comment
+    when "reply"
+      load_sample_reply
+    when "email_verification"
+      load_sample_user
+    when "user_invite"
+      @subject = t("mailers.user_invite.subject", org_name: Setting["org_name"])
     end
   end
 
@@ -39,12 +60,62 @@ class Admin::SystemEmailsController < Admin::BaseController
 
   private
 
-  def load_system_email
-    @system_email = params[:system_email_id]
-  end
+    def load_system_email
+      @system_email = params[:system_email_id]
+    end
 
-  def unsent_proposal_notifications_ids
-    Notification.where(notifiable_type: "ProposalNotification", emailed_at: nil)
-                .group(:notifiable_id).count.keys
-  end
+    def load_sample_proposal_notifications
+      @notifications = Notification.where(notifiable_type: "ProposalNotification").limit(2)
+      @subject = t("mailers.proposal_notification_digest.title", org_name: Setting["org_name"])
+    end
+
+    def load_sample_investment
+      if Budget::Investment.any?
+        @investment = Budget::Investment.last
+        @subject = t("mailers.#{@system_email}.subject", code: @investment.code)
+      else
+        redirect_to admin_system_emails_path, alert: t("admin.system_emails.alert.no_investments")
+      end
+    end
+
+    def load_sample_comment
+      @comment = Comment.where(commentable_type: %w[Debate Proposal Budget::Investment]).last
+      if @comment
+        @commentable = @comment.commentable
+        @subject = t("mailers.comment.subject", commentable: commentable_name)
+      else
+        redirect_to admin_system_emails_path, alert: t("admin.system_emails.alert.no_comments")
+      end
+    end
+
+    def load_sample_reply
+      reply = Comment.select { |comment| comment.reply? }.last
+      if reply
+        @email = ReplyEmail.new(reply)
+      else
+        redirect_to admin_system_emails_path, alert: t("admin.system_emails.alert.no_replies")
+      end
+    end
+
+    def load_sample_user
+      @user = User.last
+      @token = @user.email_verification_token || SecureRandom.hex
+      @subject = t("mailers.email_verification.subject")
+    end
+
+    def load_sample_direct_message
+      @direct_message = DirectMessage.new(sender: current_user, receiver: current_user,
+                                          title: t("admin.system_emails.message_title"),
+                                          body: t("admin.system_emails.message_body"))
+      @subject = t("mailers.#{@system_email}.subject")
+    end
+
+    def commentable_name
+      t("activerecord.models.#{@commentable.class.name.underscore}", count: 1)
+    end
+
+    def unsent_proposal_notifications_ids
+      Notification.where(notifiable_type: "ProposalNotification", emailed_at: nil)
+                  .group(:notifiable_id).count.keys
+    end
 end