rewrite weekly aggregate function to honor week boundaries

(and not use the stats table, and also be easier to read)

tests/app/dao/test_services_dao.py

@@ -1,6 +1,8 @@
+from datetime import datetime
 import uuid
-import pytest
+import functools
 
+import pytest
 from sqlalchemy.orm.exc import FlushError, NoResultFound
 from sqlalchemy.exc import IntegrityError
 from freezegun import freeze_time
@@ -16,7 +18,8 @@ from app.dao.services_dao import (
     dao_update_service,
     delete_service_and_all_associated_db_objects,
     dao_fetch_stats_for_service,
-    dao_fetch_todays_stats_for_service
+    dao_fetch_todays_stats_for_service,
+    dao_fetch_weekly_historical_stats_for_service
 )
 from app.dao.users_dao import save_model_user
 from app.models import (
@@ -36,7 +39,8 @@ from app.models import (
 )
 
 from tests.app.conftest import (
-    sample_notification as create_notification
+    sample_notification as create_notification,
+    sample_notification_history as create_notification_history
 )
 
 
@@ -407,7 +411,7 @@ def test_fetch_stats_counts_correctly(notify_db, notify_db_session, sample_templ
     create_notification(notify_db, notify_db_session, template=sample_email_template, status='technical-failure')
     create_notification(notify_db, notify_db_session, template=sample_template, status='created')
 
-    stats = dao_fetch_stats_for_service(sample_template.service.id)
+    stats = dao_fetch_stats_for_service(sample_template.service_id)
     stats = sorted(stats, key=lambda x: (x.notification_type, x.status))
     assert len(stats) == 3
 
@@ -435,9 +439,83 @@ def test_fetch_stats_for_today_only_includes_today(notify_db, notify_db_session,
     with freeze_time('2001-01-02T12:00:00'):
         right_now = create_notification(notify_db, None, to_field='3', status='created')
 
-        stats = dao_fetch_todays_stats_for_service(sample_template.service.id)
+        stats = dao_fetch_todays_stats_for_service(sample_template.service_id)
 
     stats = {row.status: row.count for row in stats}
     assert 'delivered' not in stats
     assert stats['failed'] == 1
     assert stats['created'] == 1
+
+
+def test_fetch_weekly_historical_stats_separates_weeks(notify_db, notify_db_session, sample_template):
+    notification_history = functools.partial(
+        create_notification_history,
+        notify_db,
+        notify_db_session,
+        sample_template
+    )
+    week_53_last_yr = notification_history(created_at=datetime(2016, 1, 1))
+    week_1_last_yr = notification_history(created_at=datetime(2016, 1, 5))
+    last_sunday = notification_history(created_at=datetime(2016, 7, 24, 23, 59))
+    last_monday_morning = notification_history(created_at=datetime(2016, 7, 25, 0, 0))
+    last_monday_evening = notification_history(created_at=datetime(2016, 7, 25, 23, 59))
+    today = notification_history(created_at=datetime.now(), status='delivered')
+
+    with freeze_time('Wed 27th July 2016'):
+        ret = dao_fetch_weekly_historical_stats_for_service(sample_template.service_id)
+
+    assert [(row.week_start, row.status) for row in ret] == [
+        (datetime(2015, 12, 28), 'created'),
+        (datetime(2016, 1, 4), 'created'),
+        (datetime(2016, 7, 18), 'created'),
+        (datetime(2016, 7, 25), 'created'),
+        (datetime(2016, 7, 25), 'delivered')
+    ]
+    assert ret[-2].count == 2
+    assert ret[-1].count == 1
+
+
+def test_fetch_weekly_historical_stats_ignores_second_service(notify_db, notify_db_session, service_factory):
+    template_1 = service_factory.get('1').templates[0]
+    template_2 = service_factory.get('2').templates[0]
+
+    notification_history = functools.partial(
+        create_notification_history,
+        notify_db,
+        notify_db_session
+    )
+    last_sunday = notification_history(template_1, created_at=datetime(2016, 7, 24, 23, 59))
+    last_monday_morning = notification_history(template_2, created_at=datetime(2016, 7, 25, 0, 0))
+
+    with freeze_time('Wed 27th July 2016'):
+        ret = dao_fetch_weekly_historical_stats_for_service(template_1.service_id)
+
+    assert len(ret) == 1
+    assert ret[0].week_start == datetime(2016, 7, 18)
+    assert ret[0].count == 1
+
+
+def test_fetch_weekly_historical_stats_separates_types(notify_db,
+                                                       notify_db_session,
+                                                       sample_template,
+                                                       sample_email_template):
+    notification_history = functools.partial(
+        create_notification_history,
+        notify_db,
+        notify_db_session,
+        created_at=datetime(2016, 7, 25)
+    )
+
+    notification_history(sample_template)
+    notification_history(sample_email_template)
+
+    with freeze_time('Wed 27th July 2016'):
+        ret = dao_fetch_weekly_historical_stats_for_service(sample_template.service_id)
+
+    assert len(ret) == 2
+    assert ret[0].week_start == datetime(2016, 7, 25)
+    assert ret[0].count == 1
+    assert ret[0].notification_type == 'email'
+    assert ret[1].week_start == datetime(2016, 7, 25)
+    assert ret[1].count == 1
+    assert ret[1].notification_type == 'sms'