Add bulk update functionality for trainees from spreadsheet input

generic/templates/generic/trainees.html

@@ -11,6 +11,7 @@
     {% endfor %}
     (<a href="{% url 'create_trainee' %}" title="Click to add a trainee to the platform, creating an account for them.">Add trainee</a>)
     (<a href="{% url 'accounts_bulk_create' %}" title="Click to create multiple trainees at once.">Bulk create</a>)
+    (<a href="{% url 'trainees_bulk_update_from_spreadsheet' %}" title="Click to update multiple trainees at once.">Bulk update</a>)
 
     <h2>
         {% if grade %}

generic/templates/generic/trainees_bulk_update.html

@@ -0,0 +1,50 @@
+{% extends 'generic/base.html' %}
+
+{% block content %}
+<h2>Bulk update trainees (paste spreadsheet text)</h2>
+
+<p>Paste the spreadsheet rows below. Headings like "Year 1 - Group 1" are used to set the grade (Year N -> STN). Rows should contain "Name <tab or 2+spaces> Supervisor".</p>
+
+<form method="post">
+    {% csrf_token %}
+    <textarea name="data" rows="18" style="width:100%">{% if request.POST.data %}{{ request.POST.data }}{% endif %}</textarea>
+    <div style="margin-top:8px">
+        <button type="submit" name="action" value="preview" class="btn btn-primary">Preview</button>
+        <button type="submit" name="action" value="apply" class="btn btn-danger" onclick="return confirm('This will apply updates to matched trainee profiles. Are you sure?')">Apply updates</button>
+    </div>
+</form>
+
+{% if preview %}
+    <h3>Preview ({{ preview|length }} rows)</h3>
+    <table class="table table-sm">
+        <thead>
+            <tr>
+                <th>Raw</th>
+                <th>Name</th>
+                <th>Grade</th>
+                <th>Matched user</th>
+                <th>Supervisor text</th>
+                <th>Matched supervisor</th>
+            </tr>
+        </thead>
+        <tbody>
+            {% for r in preview %}
+                <tr>
+                    <td><pre style="margin:0">{{ r.raw }}</pre></td>
+                    <td>{{ r.norm_name }}</td>
+                    <td>{{ r.grade }}</td>
+                    <td>{% if r.matched_user %}<a href="{% url 'account_profile' r.matched_user.username %}">{{ r.matched_user.first_name }} {{ r.matched_user.last_name }}</a>{% else %}<span style="color:red">No match</span>{% endif %}</td>
+                    <td>{{ r.supervisor_text }}</td>
+                    <td>{% if r.matched_supervisor %}<a href="{% url 'generic:supervisor_detail' r.matched_supervisor.pk %}">{{ r.matched_supervisor.name }}</a>{% else %}<span style="color:red">No match</span>{% endif %}</td>
+                </tr>
+            {% endfor %}
+        </tbody>
+    </table>
+{% endif %}
+
+{% if report %}
+    <h3>Apply report</h3>
+    <p>Updated: {{ report.updated }}; Skipped (no user matched): {{ report.skipped }}</p>
+{% endif %}
+
+{% endblock %}