Only let you add vaccinations once vaccines added (#512)

Fixes a bug if you try to add vaccinations before setting up vaccine
batches.

Author: frankieroberto

app/routes/helpers.js

@@ -67,6 +67,16 @@ module.exports = router => {
     res.redirect('/vaccines')
   });
 
+  router.get('/prototype-setup/add-vaccinations', (req, res) => {
+    const data = req.session.data
+
+    const vaccinesAddedCount = data.vaccineStock.length
+
+
+    res.render('prototype-setup/add-vaccinations', {
+      vaccinesAddedCount
+    })
+  })
 
   router.post('/prototype-setup/add-vaccinations', (req, res) => {
     const data = req.session.data

app/views/prototype-setup.html

@@ -17,7 +17,7 @@ <h1 class="nhsuk-heading-l">Prototype data setup</h1>
       <ul class="nhsuk-list">
         <li><a href="/prototype-setup/setup-batches">Add batches for all vaccines</a></li>
         <li><a href="/prototype-setup/add-users">Add users</a></li>
-        <li><a href="/prototype-setup/add-vaccinations">Record some vaccinations</a></li>
+        <li><a href="/prototype-setup/add-vaccinations">Add vaccinations</a></li>
       </ul>
 
     </div>

app/views/prototype-setup/add-vaccinations.html

@@ -17,24 +17,34 @@
   <div class="nhsuk-grid-row">
     <div class="nhsuk-grid-column-two-thirds">
 
-      <form action="/prototype-setup/add-vaccinations" method="post" novalidate>
-
-        {{ input({
-          name: "numberOfVaccinationsToAdd",
-          label: {
-            text: "How many vaccinations would you like to add?",
-            isPageHeading: true,
-            classes: "nhsuk-label--l"
-          },
-          classes: "nhsuk-input--width-5",
-          inputmode: "numeric"
-        }) }}
-
-        {{ button({
-          text: "Add vaccinations"
-        }) }}
-
-      </form>
+      <h1 class="nhsuk-heading-l">Add vaccinations</h1>
+
+      {% if vaccinesAddedCount > 0 %}
+
+        <p>This adds random vaccinations, distributed across the current vaccines and batches set up, in order to test the <a href="/records">Records</a> section.</p>
+
+        <form action="/prototype-setup/add-vaccinations" method="post" novalidate>
+
+          {{ input({
+            name: "numberOfVaccinationsToAdd",
+            label: {
+              text: "How many would you like to add?",
+              isPageHeading: true,
+              classes: "nhsuk-label--m"
+            },
+            classes: "nhsuk-input--width-5",
+            inputmode: "numeric"
+          }) }}
+
+          {{ button({
+            text: "Add vaccinations"
+          }) }}
+
+        </form>
+
+      {% else %}
+        <p>You need to add or setup some batches before vaccinations can be added.</p>
+      {% endif %}
 
     </div>
   </div>