Add option to copy existing template when adding

Sometimes when setting up a service you might have a few very similar
templates, in which only a small amount of content. Or you might even
have a few of services, which are used by different teams but have
similar templates.

Copy and pasting, especially from one service to another, is a pain.
This commit makes it easier by allowing users to copy an existing
template when choosing to add a new one, instead of starting from
scratch.

tests/app/main/views/test_letters.py

@@ -56,17 +56,19 @@ def test_letters_lets_in_without_permission(
 @pytest.mark.parametrize('permissions, choices', [
     (
         ['email', 'sms', 'letter'],
-        ['Email', 'Text message', 'Letter']
+        ['Email', 'Text message', 'Letter', 'Copy of an existing template']
     ),
     (
         ['email', 'sms'],
-        ['Email', 'Text message']
+        ['Email', 'Text message', 'Copy of an existing template']
     ),
 ])
 def test_given_option_to_add_letters_if_allowed(
     logged_in_client,
     service_one,
     mocker,
+    mock_get_service_templates,
+    mock_get_organisations_and_services_for_user,
     permissions,
     choices,
 ):

tests/app/main/views/test_templates.py

@@ -18,6 +18,8 @@ from tests import (
 )
 from tests.conftest import (
     SERVICE_ONE_ID,
+    SERVICE_TWO_ID,
+    TEMPLATE_ONE_ID,
     active_caseworking_user,
     active_user_view_permissions,
     mock_get_service_email_template,
@@ -394,11 +396,127 @@ def test_dont_show_preview_letter_templates_for_bad_filetype(
     assert mock_get_service_template.called is False
 
 
+def test_choosing_to_copy_redirects(
+    client_request,
+    mock_get_service_templates,
+    mock_get_organisations_and_services_for_user,
+):
+    client_request.post(
+        'main.add_template_by_type',
+        service_id=SERVICE_ONE_ID,
+        _data={'template_type': 'copy-existing'}
+    )
+
+
+def test_choose_a_template_to_copy(
+    client_request,
+    mock_get_service_templates,
+    mock_get_non_empty_organisations_and_services_for_user,
+):
+    page = client_request.get(
+        'main.choose_template_to_copy',
+        service_id=SERVICE_ONE_ID,
+    )
+
+    assert normalize_spaces(
+        page.select_one('main nav').text
+    ) == normalize_spaces(
+        'Service 1 '
+        '    sms_template_one '
+        '    Text message template'
+        '    sms_template_two Text message template'
+        '    email_template_one Email template'
+        '    email_template_two Email template '
+        'Service 2 '
+        '    sms_template_one'
+        '    Text message template'
+        '    sms_template_two'
+        '    Text message template'
+        '    email_template_one'
+        '    Email template'
+        '    email_template_two'
+        '    Email template '
+        'Org 1 service 1 '
+        '    sms_template_one'
+        '    Text message template'
+        '    sms_template_two'
+        '    Text message template'
+        '    email_template_one'
+        '    Email template'
+        '    email_template_two'
+        '    Email template '
+        'Org 1 service 2 '
+        '    sms_template_one'
+        '    Text message template'
+        '    sms_template_two'
+        '    Text message template'
+        '    email_template_one'
+        '    Email template'
+        '    email_template_two'
+        '    Email template'
+    )
+
+    assert page.select_one('main nav a')['href'] == url_for(
+        'main.copy_template',
+        service_id=SERVICE_ONE_ID,
+        template_id=TEMPLATE_ONE_ID,
+        from_service=SERVICE_TWO_ID,
+    )
+
+
+def test_load_edit_template_with_copy_of_template(
+    client_request,
+    mock_get_service_email_template,
+    mock_get_non_empty_organisations_and_services_for_user,
+):
+    page = client_request.get(
+        'main.copy_template',
+        service_id=SERVICE_ONE_ID,
+        template_id=TEMPLATE_ONE_ID,
+        from_service=SERVICE_TWO_ID,
+    )
+
+    assert page.select_one('form')['method'] == 'post'
+    assert page.select_one('form')['action'] == url_for(
+        'main.add_service_template',
+        service_id=SERVICE_ONE_ID,
+        template_type='email',
+    )
+
+    assert page.select_one('input')['value'] == (
+        'Copy of ‘Two week reminder’'
+    )
+    assert page.select_one('textarea').text == (
+        'Your ((thing)) is due soon'
+    )
+    mock_get_service_email_template.assert_called_once_with(
+        SERVICE_TWO_ID,
+        TEMPLATE_ONE_ID,
+    )
+
+
+def test_cant_copy_template_from_non_member_service(
+    client_request,
+    mock_get_service_email_template,
+    mock_get_organisations_and_services_for_user,
+):
+    client_request.get(
+        'main.copy_template',
+        service_id=SERVICE_ONE_ID,
+        template_id=TEMPLATE_ONE_ID,
+        from_service=SERVICE_TWO_ID,
+        _expected_status=403,
+    )
+    assert mock_get_service_email_template.call_args_list == []
+
+
 @pytest.mark.parametrize('type_of_template', ['email', 'sms'])
 def test_should_not_allow_creation_of_template_through_form_without_correct_permission(
     logged_in_client,
     service_one,
     mocker,
+    mock_get_service_templates,
+    mock_get_organisations_and_services_for_user,
     type_of_template,
 ):
     service_one['permissions'] = []