add add one-off notification status

completely mimicks the job status page, and as such, all the code and
templates have been taken from the job page. This page performs
exactly the same as the job page for now

* total, sending, delivered, failed blue boxes (though they'll just
  read 0/1 for now.
* download report button (same as with job download, except without job
  or row number in file)
* removed references to scheduled
* kept references to help (aka tour/tutorial) as that'll eventually
  change over from a job to a one-off too

app/main/__init__.py

@@ -29,4 +29,5 @@ from app.main.views import (
     platform_admin,
     letter_jobs,
     conversation,
+    notifications
 )

app/main/views/jobs.py

@@ -1,8 +1,5 @@
 # -*- coding: utf-8 -*-
-import ago
-import dateutil
 from orderedset import OrderedSet
-from datetime import datetime, timedelta, timezone
 from itertools import chain
 
 from flask import (
@@ -35,6 +32,7 @@ from app.utils import (
     generate_notifications_csv,
     get_help_argument,
     get_template,
+    get_time_left,
     REQUESTED_STATUSES,
     FAILURE_STATUSES,
     SENDING_STATUSES,
@@ -364,7 +362,7 @@ def get_job_partials(job):
     )
     return {
         'counts': render_template(
-            'partials/jobs/count.html',
+            'partials/count.html',
             counts=_get_job_counts(job, request.args.get('help', 0)),
             status=filter_args['status']
         ),
@@ -388,16 +386,3 @@ def get_job_partials(job):
             job=job
         ),
     }
-
-
-def get_time_left(job_created_at):
-    return ago.human(
-        (
-            datetime.now(timezone.utc).replace(hour=23, minute=59, second=59)
-        ) - (
-            dateutil.parser.parse(job_created_at) + timedelta(days=8)
-        ),
-        future_tense='Data available for {}',
-        past_tense='Data no longer available',  # No-one should ever see this
-        precision=1
-    )

app/main/views/notifications.py

@@ -0,0 +1,137 @@
+# -*- coding: utf-8 -*-
+from flask import (
+    render_template,
+    jsonify,
+    request,
+    url_for,
+    current_app
+)
+from flask_login import login_required
+
+from app import (
+    notification_api_client,
+    current_service
+)
+from app.main import main
+from app.utils import (
+    user_has_permissions,
+    get_help_argument,
+    get_template,
+    get_time_left,
+    REQUESTED_STATUSES,
+    FAILURE_STATUSES,
+    SENDING_STATUSES,
+    DELIVERED_STATUSES,
+)
+
+
+def get_status_arg(filter_args):
+    if 'status' not in filter_args or not filter_args['status']:
+        return REQUESTED_STATUSES
+    elif filter_args['status'] == 'sending':
+        return SENDING_STATUSES
+    elif filter_args['status'] == 'delivered':
+        return DELIVERED_STATUSES
+    elif filter_args['status'] == 'failed':
+        return FAILURE_STATUSES
+    else:
+        current_app.logger.info('Unrecognised status filter: {}'.format(filter_args['status']))
+        return REQUESTED_STATUSES
+
+
+@main.route("/services/<service_id>/one-off-notification/<notification_id>")
+@login_required
+@user_has_permissions('view_activity', admin_override=True)
+def view_notification(service_id, notification_id):
+    notification = notification_api_client.get_notification(service_id, notification_id)
+    return render_template(
+        'views/notifications/notification.html',
+        finished=(notification['status'] in (DELIVERED_STATUSES + FAILURE_STATUSES)),
+        uploaded_file_name='Report',
+        template=get_template(
+            notification['template'],
+            current_service,
+            letter_preview_url=url_for(
+                '.view_template_version_preview',
+                service_id=service_id,
+                template_id=notification['template']['id'],
+                version=notification['template_version'],
+                filetype='png',
+            ),
+        ),
+        status=request.args.get('status'),
+        updates_url=url_for(
+            ".view_notification_updates",
+            service_id=service_id,
+            notification_id=notification['id'],
+            status=request.args.get('status'),
+            help=get_help_argument()
+        ),
+        partials=get_single_notification_partials(notification),
+        help=get_help_argument()
+    )
+
+
+@main.route("/services/<service_id>/one-off-notification/<notification_id>.json")
+@user_has_permissions('view_activity', admin_override=True)
+def view_notification_updates(service_id, notification_id):
+    return jsonify(**get_single_notification_partials(
+        notification_api_client.get_notification(service_id, notification_id)
+    ))
+
+
+def _get_single_notification_counts(notification, help_argument):
+    return [
+        (
+            label,
+            query_param,
+            url_for(
+                ".view_notification",
+                service_id=notification['service'],
+                notification_id=notification['id'],
+                status=query_param,
+                help=help_argument
+            ),
+            count
+        ) for label, query_param, count in [
+            [
+                'total', '',
+                1
+            ],
+            [
+                'sending', 'sending',
+                int(notification['status'] in SENDING_STATUSES)
+            ],
+            [
+                'delivered', 'delivered',
+                int(notification['status'] in DELIVERED_STATUSES)
+            ],
+            [
+                'failed', 'failed',
+                int(notification['status'] in FAILURE_STATUSES)
+            ]
+        ]
+    ]
+
+
+def get_single_notification_partials(notification):
+    status_args = get_status_arg(request.args)
+
+    return {
+        'counts': render_template(
+            'partials/count.html',
+            counts=_get_single_notification_counts(notification, request.args.get('help', 0)),
+            status=status_args
+        ),
+        'notifications': render_template(
+            'partials/notifications/notifications.html',
+            notification=notification,
+            more_than_one_page=False,
+            percentage_complete=100,
+            time_left=get_time_left(notification['created_at']),
+        ),
+        'status': render_template(
+            'partials/notifications/status.html',
+            notification=notification
+        ),
+    }