PromoteLinkForm: Display a summary of the promotion.

r2/r2/lib/pages/pages.py

@@ -3413,7 +3413,7 @@ class PromoteLinkForm(Templated):
 
         self.link = link
         self.listing = listing
-        campaigns = PromoCampaign._by_link(link._id)
+        campaigns = list(PromoCampaign._by_link(link._id))
         self.campaigns = RenderableCampaign.from_campaigns(link, campaigns)
         self.promotion_log = PromotionLog.get(link)
 
@@ -3475,6 +3475,32 @@ class PromoteLinkForm(Templated):
         message %= {'link': 'http://www.slideshare.net/MikeCole1/brands-that-were-awesome-on-reddit-2013-30801823'}
         self.infobar = InfoBar(message=message)
 
+        if campaigns:
+            subreddits = set()
+            budget = 0.
+            impressions = 0
+
+            for campaign in campaigns:
+                subreddits.add(campaign.sr_name)
+                budget += campaign.bid
+                if hasattr(campaign, 'cpm') and campaign.priority.cpm:
+                    impressions += campaign.impressions
+
+            num_srs = len(subreddits)
+            summary = ungettext("this promotion has a total budget of "
+                                "%(budget)s for %(impressions)s impressions in "
+                                "%(num)s subreddit",
+                                "this promotion has a total budget of "
+                                "%(budget)s for %(impressions)s impressions in "
+                                "%(num)s subreddits",
+                                num_srs)
+            self.summary = summary % {
+                'budget': format_currency(budget, 'USD', locale=c.locale),
+                'impressions': format_number(impressions),
+                'num': num_srs,
+            }
+        else:
+            self.summary = None
 
 class RenderableCampaign(Templated):
     def __init__(self, link, campaign, transaction, is_pending, is_live,

r2/r2/templates/promotelinkform.html

@@ -530,6 +530,17 @@ ${self.javascript_setup()}
           ${_("You don't have any campaigns for this link yet.  You should add one.")}
         </p>
       </div>
+
+      %if thing.summary:
+      <div class="help">
+        <div class="infotext rounded">
+          <p>
+            ${thing.summary}
+          </p>
+        </div>
+      </div>
+      %endif
+
       <span class="freebie error"></span>
     </%utils:line_field>
   </div>