start stubbing out endpoints

app/routes/topics.py

@@ -1,6 +1,7 @@
-from flask import Blueprint, redirect, url_for, render_template
+from flask import Blueprint, redirect, url_for, render_template, request, session
 
-from ..models import Topics
+from ..models import Topics, Threads
+import math
 
 bp = Blueprint('topics', __name__, url_prefix = '/topics/')
 
@@ -12,6 +13,15 @@ def all_topics():
 @bp.get('/<slug>')
 def topic(slug):
     t = Topics.find({'slug': slug})
-    if t:
-        return 'yes'
-    return 'no'
+    if not t:
+        return 'stub'
+    sort_by = request.args.get('sort_by', default=session.get('sort_by', default='activity'))
+    PER_PAGE = 10
+    threads_count = Threads.count({'topic_id': t.id})
+    page_count = max(1, math.ceil(threads_count / PER_PAGE))
+    page = max(1, min(int(request.args.get('page', default=1)), page_count))
+    return render_template('topics/topic.html', topic=t, threads=t.get_threads(PER_PAGE, page, sort_by), sort_by=sort_by, page=page, page_count=page_count)
+
+@bp.get('/<slug>/feed.atom')
+def feed(slug):
+    return 'stub'