Auto populate the phone number when replying

Currently the only way of ‘replying’ to an inbound message is by
copy/pasting the phone number from the inbound page into the send one
off page. Rather than making people copy/paste, this commit puts the
phone number in the session, if the user is going through the new reply
flow.

app/main/views/conversation.py

@@ -1,5 +1,7 @@
 from flask import (
     jsonify,
+    session,
+    redirect,
     render_template,
     url_for,
 )
@@ -60,9 +62,30 @@ def conversation_reply(
         show_search_box=(len(templates) > 7),
         template_type='sms',
         search_form=SearchTemplatesForm(),
+        notification_id=notification_id,
     )
 
 
+@main.route("/services/<service_id>/conversation/<notification_id>/reply-with/<template_id>")
+@login_required
+@user_has_permissions('send_texts', admin_override=True)
+def conversation_reply_with_template(
+    service_id,
+    notification_id,
+    template_id,
+):
+
+    session['recipient'] = get_user_number(service_id, notification_id)
+    session['placeholders'] = {'phone number': session['recipient']}
+
+    return redirect(url_for(
+        'main.send_one_off_step',
+        service_id=service_id,
+        template_id=template_id,
+        step_index=1,
+    ))
+
+
 def get_conversation_partials(service_id, user_number):
 
     return {

app/templates/views/templates/choose-reply.html

@@ -43,7 +43,7 @@
       {% for template in templates %}
         <div class="column-whole">
           <h2 class="message-name">
-            <a href="{{ url_for('.view_template', service_id=current_service.id, template_id=template.id) }}">{{ template.name }}</a>
+            <a href="{{ url_for('.conversation_reply_with_template', service_id=current_service.id, template_id=template.id, notification_id=notification_id) }}">{{ template.name }}</a>
           </h2>
           <p class="message-type">
             {{ message_count_label(1, template.template_type, suffix='')|capitalize }} template

tests/app/main/views/test_conversation.py

@@ -257,8 +257,32 @@ def test_conversation_reply_shows_templates(
         assert normalize_spaces(link.text) == expected
         assert link.select_one('a')['href'].startswith(
             url_for(
-                'main.view_template',
+                'main.conversation_reply_with_template',
                 service_id=SERVICE_ONE_ID,
+                notification_id=fake_uuid,
                 template_id='',
             )
         )
+
+
+def test_conversation_reply_redirects_with_phone_number_from_notification(
+    client_request,
+    fake_uuid,
+    mock_get_notification,
+    mock_get_service_template,
+):
+
+    page = client_request.get(
+        'main.conversation_reply_with_template',
+        service_id=SERVICE_ONE_ID,
+        notification_id=fake_uuid,
+        template_id=fake_uuid,
+        _follow_redirects=True,
+    )
+
+    for element, expected_text in [
+        ('h1', 'Preview of Two week reminder'),
+        ('.sms-message-recipient', 'To: 07123 456789'),
+        ('.sms-message-wrapper', 'service one: Template <em>content</em> with & entity'),
+    ]:
+        assert normalize_spaces(page.select_one(element).text) == expected_text