join sifrovacka only when it is active

sifrovacka/templates/sifrovacka.html

@@ -39,20 +39,26 @@
   <hr>
   {% if request.user.is_authenticated %}
    {% if not sifrovacka_stage_count == 0 %}
-    {% if not sifrovacka_current_stage_urlhash %}
-      <form action="{% url 'home' %}" method="post">
-      {% csrf_token %}
-      <button class="btn btn--autowidth btn--hoveractive btn--to-grey-500" type="submit" value={{ sifrovacka_id }} name='signupsif'>
-      <div class="btn__body ">Přihlásit se k šifrovačce</div>
-     </button>
-      </form>
+    {% if not is_archived_sifrovacka %}
+     {% if not sifrovacka_current_stage_urlhash %}
+       <form action="{% url 'home' %}" method="post">
+       {% csrf_token %}
+       <button class="btn btn--autowidth btn--hoveractive btn--to-grey-500" type="submit" value={{ sifrovacka_id }} name='signupsif'>
+       <div class="btn__body ">Přihlásit se k šifrovačce</div>
+      </button>
+       </form>
+     {% else %}
+       <h1 class="head-alt-sm">Vaše Aktuální úroveň</h1>
+       {% for stage in sifrovacka_stages %}
+           {% if sifrovacka_current_stage_urlhash.at_stage == stage.stage_urlhash %}
+            <li><a href={% url 'stage' stage.sifrovacka_id stage.stage_urlhash %}>{{ stage }}</a></li>
+           {% endif %}
+       {% endfor %}
+     {% endif %}
     {% else %}
-      <h1 class="head-alt-sm">Vaše Aktuální úroveň</h1>
-      {% for stage in sifrovacka_stages %}
-          {% if sifrovacka_current_stage_urlhash.at_stage == stage.stage_urlhash %}
-           <li><a href={% url 'stage' stage.sifrovacka_id stage.stage_urlhash %}>{{ stage }}</a></li>
-          {% endif %}
-      {% endfor %}
+     <div class="alert alert--grey-125">
+      <span> Šifrovačka skončila a není možné se k ní přihlásit.</span>
+     </div>
     {% endif %}
    {% else %}
     <div class="alert alert--grey-125">