Add sent notifications page for caseworkers

The other task that caseworkers have to do (much less often than sending
messages) is look at the messages which they’ve sent. The reason for
doing this is usually to find a specific message which someone has
complained about.

This commit adds:
- a page where they can do that
- a navigation item so they can get to that page

We reckon that because this is about finding specific messages, not
reporting that it’s fine to mush all the channels (email, text, letter)
into one table.

app/main/views/jobs.py

@@ -164,10 +164,11 @@ def view_job_updates(service_id, job_id):
     ))
 
 
+@main.route('/services/<service_id>/notifications', methods=['GET', 'POST'])
 @main.route('/services/<service_id>/notifications/<message_type>', methods=['GET', 'POST'])
 @login_required
-@user_has_permissions('view_activity')
-def view_notifications(service_id, message_type):
+@user_has_permissions('view_activity', 'send_messages')
+def view_notifications(service_id, message_type=None):
     return render_template(
         'views/notifications.html',
         partials=get_notifications(service_id, message_type),
@@ -185,22 +186,23 @@ def view_notifications(service_id, message_type):
     )
 
 
+@main.route('/services/<service_id>/notifications.json', methods=['GET', 'POST'])
 @main.route('/services/<service_id>/notifications/<message_type>.json', methods=['GET', 'POST'])
-@user_has_permissions('view_activity')
-def get_notifications_as_json(service_id, message_type):
+@user_has_permissions('view_activity', 'send_messages')
+def get_notifications_as_json(service_id, message_type=None):
     return jsonify(get_notifications(
         service_id, message_type, status_override=request.args.get('status')
     ))
 
 
 @main.route('/services/<service_id>/notifications/<message_type>.csv', endpoint="view_notifications_csv")
-@user_has_permissions('view_activity')
+@user_has_permissions('view_activity', 'send_messages')
 def get_notifications(service_id, message_type, status_override=None):
     # TODO get the api to return count of pages as well.
     page = get_page_from_request()
     if page is None:
         abort(404, "Invalid page argument ({}).".format(request.args.get('page')))
-    if message_type not in ['email', 'sms', 'letter']:
+    if message_type not in ['email', 'sms', 'letter', None]:
         abort(404)
     filter_args = parse_filter_args(request.args)
     filter_args['status'] = set_status_filters(filter_args)
@@ -221,7 +223,7 @@ def get_notifications(service_id, message_type, status_override=None):
     notifications = notification_api_client.get_notifications_for_service(
         service_id=service_id,
         page=page,
-        template_type=[message_type],
+        template_type=[message_type] if message_type else [],
         status=filter_args.get('status'),
         limit_days=current_app.config['ACTIVITY_STATS_LIMIT_DAYS'],
         to=request.form.get('to', ''),
@@ -239,6 +241,16 @@ def get_notifications(service_id, message_type, status_override=None):
     if 'links' in notifications and notifications['links'].get('next', None):
         next_page = generate_next_dict('main.view_notifications', service_id, page, url_args)
 
+    if message_type:
+        download_link = url_for(
+            '.view_notifications_csv',
+            service_id=current_service['id'],
+            message_type=message_type,
+            status=request.args.get('status')
+        )
+    else:
+        download_link = None
+
     return {
         'counts': render_template(
             'views/activity/counts.html',
@@ -259,18 +271,22 @@ def get_notifications(service_id, message_type, status_override=None):
             next_page=next_page,
             status=request.args.get('status'),
             message_type=message_type,
-            download_link=url_for(
-                '.view_notifications_csv',
-                service_id=current_service['id'],
-                message_type=message_type,
-                status=request.args.get('status')
-            )
+            download_link=download_link,
         ),
     }
 
 
 def get_status_filters(service, message_type, statistics):
-    stats = statistics[message_type]
+    if message_type is None:
+        stats = {
+            key: sum(
+                statistics[message_type][key]
+                for message_type in {'email', 'sms', 'letter'}
+            )
+            for key in {'requested', 'delivered', 'failed'}
+        }
+    else:
+        stats = statistics[message_type]
     stats['sending'] = stats['requested'] - stats['delivered'] - stats['failed']
 
     filters = [