Remove letters from caseworking view

Because one-off letters aren’t a thing yet there’s no way for
caseworkers to send letters. So showing them letter templates will just
confuse them.

app/main/views/templates.py

@@ -102,6 +102,22 @@ def start_tour(service_id, template_id):
 def choose_template(service_id, template_type='all'):
     templates = service_api_client.get_service_templates(service_id)['data']
 
+    letters_available = (
+        'letter' in current_service['permissions'] and
+        current_user.has_permissions('view_activity')
+    )
+
+    available_template_types = list(filter(None, (
+        'email',
+        'sms',
+        'letter' if letters_available else None,
+    )))
+
+    templates = [
+        template for template in templates
+        if template['template_type'] in available_template_types
+    ]
+
     has_multiple_template_types = len({
         template['template_type'] for template in templates
     }) > 1
@@ -112,13 +128,16 @@ def choose_template(service_id, template_type='all'):
             ('All', 'all'),
             ('Text message', 'sms'),
             ('Email', 'email'),
-            ('Letter', 'letter') if 'letter' in current_service['permissions'] else None,
+            ('Letter', 'letter') if letters_available else None,
         ])
     ]
 
     templates_on_page = [
         template for template in templates
-        if template_type in ['all', template['template_type']]
+        if (
+            template_type in ['all', template['template_type']] and
+            template['template_type'] in available_template_types
+        )
     ]
 
     if current_user.has_permissions('view_activity'):

tests/app/main/views/test_templates.py

@@ -19,6 +19,7 @@ from tests import (
 from tests.conftest import (
     SERVICE_ONE_ID,
     active_caseworking_user,
+    active_user_view_permissions,
     mock_get_service_email_template,
     mock_get_service_letter_template,
     mock_get_service_template,
@@ -29,30 +30,79 @@ from tests.conftest import service_one as create_sample_service
 from tests.conftest import single_letter_contact_block
 
 
-@pytest.mark.parametrize('extra_args, expected_nav_links, expected_templates', [
+@pytest.mark.parametrize(
+    'user, expected_page_title, extra_args, expected_nav_links, expected_templates',
+    [
         (
+            active_user_view_permissions,
+            'Templates',
             {},
-        ['Text message', 'Email'],
+            ['Text message', 'Email', 'Letter'],
-        ['sms_template_one', 'sms_template_two', 'email_template_one', 'email_template_two']
+            [
+                'sms_template_one',
+                'sms_template_two',
+                'email_template_one',
+                'email_template_two',
+                'letter_template_one',
+                'letter_template_two',
+            ]
         ),
         (
+            active_user_view_permissions,
+            'Templates',
             {'template_type': 'sms'},
-        ['All', 'Email'],
+            ['All', 'Email', 'Letter'],
             ['sms_template_one', 'sms_template_two'],
         ),
         (
+            active_user_view_permissions,
+            'Templates',
+            {'template_type': 'email'},
+            ['All', 'Text message', 'Letter'],
+            ['email_template_one', 'email_template_two'],
+        ),
+        (
+            active_user_view_permissions,
+            'Templates',
+            {'template_type': 'letter'},
+            ['All', 'Text message', 'Email'],
+            ['letter_template_one', 'letter_template_two'],
+        ),
+        (
+            active_caseworking_user,
+            'Choose a template',
+            {},
+            ['Text message', 'Email'],
+            [
+                'sms_template_one',
+                'sms_template_two',
+                'email_template_one',
+                'email_template_two',
+            ],
+        ),
+        (
+            active_caseworking_user,
+            'Choose a template',
             {'template_type': 'email'},
             ['All', 'Text message'],
             ['email_template_one', 'email_template_two'],
         ),
-])
+    ]
+)
 def test_should_show_page_for_choosing_a_template(
     client_request,
     mock_get_service_templates,
     extra_args,
     expected_nav_links,
     expected_templates,
+    service_one,
+    mocker,
+    fake_uuid,
+    user,
+    expected_page_title,
 ):
+    mocker.patch('app.user_api_client.get_user', return_value=user(fake_uuid))
+    service_one['permissions'].append('letter')
 
     page = client_request.get(
         'main.choose_template',
@@ -60,7 +110,7 @@ def test_should_show_page_for_choosing_a_template(
         **extra_args
     )
 
-    assert normalize_spaces(page.select('h1')[0].text) == 'Templates'
+    assert normalize_spaces(page.select_one('h1').text) == expected_page_title
 
     links_in_page = page.select('.pill a')
 

tests/conftest.py

@@ -953,6 +953,8 @@ def mock_get_service_templates(mocker):
     uuid2 = str(generate_uuid())
     uuid3 = str(generate_uuid())
     uuid4 = str(generate_uuid())
+    uuid5 = str(generate_uuid())
+    uuid6 = str(generate_uuid())
 
     def _create(service_id):
         return {'data': [
@@ -969,7 +971,15 @@ def mock_get_service_templates(mocker):
             template_json(
                 service_id, uuid4, "email_template_two", "email", "email template two content",
                 subject='email template two subject',
-            )
+            ),
+            template_json(
+                service_id, uuid5, "letter_template_one", "letter", "letter template one content",
+                subject='letter template one subject',
+            ),
+            template_json(
+                service_id, uuid6, "letter_template_two", "letter", "letter template two content",
+                subject='letter template two subject',
+            ),
         ]}
 
     return mocker.patch(