Paginate complaints page

The API now returns paginated complaint data, so the
`/platform-admin/complaints` page can now be paginated.

app/main/views/platform_admin.py

@@ -12,7 +12,11 @@ from app import (
 from app.main import main
 from app.main.forms import DateFilterForm
 from app.statistics_utils import get_formatted_percentage
-from app.utils import user_is_platform_admin
+from app.utils import (
+    generate_next_dict,
+    generate_previous_dict,
+    user_is_platform_admin,
+)
 
 COMPLAINT_THRESHOLD = 0.02
 FAILURE_THRESHOLD = 3
@@ -190,11 +194,23 @@ def platform_admin_services():
 @login_required
 @user_is_platform_admin
 def platform_admin_list_complaints():
-    complaints = complaint_api_client.get_all_complaints()
+    page = int(request.args.get('page', 1))
+    response = complaint_api_client.get_all_complaints(page=page)
+
+    prev_page = None
+    if response['links'].get('prev'):
+        prev_page = generate_previous_dict('main.platform_admin_list_complaints', None, page)
+    next_page = None
+    if response['links'].get('next'):
+        next_page = generate_next_dict('main.platform_admin_list_complaints', None, page)
+
     return render_template(
         'views/platform-admin/complaints.html',
-        complaints=complaints,
+        complaints=response['complaints'],
         page_title='All Complaints',
+        page=page,
+        prev_page=prev_page,
+        next_page=next_page,
     )
 
 

app/notify_client/complaint_api_client.py

@@ -7,8 +7,9 @@ class ComplaintApiClient(NotifyAdminAPIClient):
     def __init__(self):
         super().__init__("a" * 73, "b")
 
-    def get_all_complaints(self):
-        return self.get('/complaint')
+    def get_all_complaints(self, page=1):
+        params = {'page': page}
+        return self.get('/complaint', params=params)
 
     def get_complaint_count(self, params_dict=None):
         return self.get('/complaint/count-by-date-range', params=params_dict)

app/templates/views/platform-admin/complaints.html

@@ -1,5 +1,6 @@
 {% extends "views/platform-admin/_base_template.html" %}
 {% from "components/page-footer.html" import page_footer %}
+{% from "components/previous-next-navigation.html" import previous_next_navigation %}
 {% from "components/table.html" import list_table, field, text_field, link_field, right_aligned_field_heading, hidden_field_heading %}
 
 {% block per_page_title %}
@@ -28,9 +29,10 @@
 
       {{ text_field(item.complaint_type) }}
 
-      {{ text_field(item.complaint_date|format_datetime_short) }}
+      {{ text_field(item.complaint_date|format_datetime_short if item.complaint_date else None) }}
 
   {% endcall %}
 
+  {{ previous_next_navigation(prev_page, next_page) }}
 
 {% endblock %}

tests/app/main/views/test_platform_admin.py

@@ -662,7 +662,7 @@ def test_platform_admin_list_complaints(
         'created_at': '2018-06-05T13:50:30.012354',
     }
     mock = mocker.patch('app.complaint_api_client.get_all_complaints',
-                        return_value=[complaint])
+                        return_value={'complaints': [complaint], 'links': {}})
 
     client.login(platform_admin_user)
     response = client.get(url_for('main.platform_admin_list_complaints'))
@@ -673,6 +673,39 @@ def test_platform_admin_list_complaints(
     assert mock.called
 
 
+def test_should_show_complaints_with_next_previous(mocker, client, platform_admin_user, service_one, fake_uuid):
+    mock_get_user(mocker, user=platform_admin_user)
+    client.login(platform_admin_user)
+
+    api_response = {
+        'complaints': [{'complaint_date': None,
+                        'complaint_type': None,
+                        'created_at': '2017-12-18T05:00:00.000000Z',
+                        'id': fake_uuid,
+                        'notification_id': fake_uuid,
+                        'service_id': service_one['id'],
+                        'service_name': service_one['name'],
+                        'ses_feedback_id': 'None'}],
+        'links': {'last': '/complaint?page=3', 'next': '/complaint?page=3', 'prev': '/complaint?page=1'}
+    }
+
+    mocker.patch('app.complaint_api_client.get_all_complaints', return_value=api_response)
+
+    response = client.get(url_for('main.platform_admin_list_complaints', page=2))
+
+    assert response.status_code == 200
+    page = BeautifulSoup(response.data.decode('utf-8'), 'html.parser')
+
+    next_page_link = page.find('a', {'rel': 'next'})
+    prev_page_link = page.find('a', {'rel': 'previous'})
+    assert (url_for('main.platform_admin_list_complaints', page=3) in next_page_link['href'])
+    assert 'Next page' in next_page_link.text.strip()
+    assert 'page 3' in next_page_link.text.strip()
+    assert (url_for('main.platform_admin_list_complaints', page=1) in prev_page_link['href'])
+    assert 'Previous page' in prev_page_link.text.strip()
+    assert 'page 1' in prev_page_link.text.strip()
+
+
 @pytest.mark.parametrize('number, total, threshold, result', [
     (0, 0, 0, False),
     (1, 1, 0, True),

tests/app/notify_client/test_compliant_client.py

@@ -7,7 +7,16 @@ def test_get_all_complaints(mocker):
     mock = mocker.patch('app.notify_client.complaint_api_client.ComplaintApiClient.get')
 
     client.get_all_complaints()
-    mock.assert_called_once_with('/complaint')
+    mock.assert_called_once_with('/complaint', params={'page': 1})
+
+
+def test_get_all_complaints_with_a_page_number_specified(mocker):
+    client = ComplaintApiClient()
+
+    mock = mocker.patch('app.notify_client.complaint_api_client.ComplaintApiClient.get')
+
+    client.get_all_complaints(page=3)
+    mock.assert_called_once_with('/complaint', params={'page': 3})
 
 
 def test_get_complaint_count(mocker):