Add page to show all uploaded letters

Because we won’t be showing uploaded letters individually on the uploads
page any more we need a way of listing them. This should be by printing
day, to match how we’re grouping them on the uploads page.

This code reuses the notifications.html template, but flips the
precedence of the filename and recipient because I reckon when you’re
looking at uploads you’re thinking filename-first.

app/main/views/uploads.py

@@ -25,7 +25,12 @@ from requests import RequestException
 from xlrd.biffh import XLRDError
 from xlrd.xldate import XLDateError
 
-from app import current_service, notification_api_client, service_api_client
+from app import (
+    current_service,
+    notification_api_client,
+    service_api_client,
+    upload_api_client,
+)
 from app.extensions import antivirus_client
 from app.main import main
 from app.main.forms import CsvUploadForm, LetterUploadPostageForm, PDFUploadForm
@@ -42,7 +47,9 @@ from app.utils import (
     generate_next_dict,
     generate_previous_dict,
     get_errors_for_csv,
+    get_letter_printing_statement,
     get_letter_validation_error,
+    get_page_from_request,
     get_sample_template,
     get_template,
     unicode_truncate,
@@ -83,6 +90,53 @@ def uploads(service_id):
     )
 
 
+@main.route("/services/<uuid:service_id>/uploaded-letters/<simple_date:letter_print_day>")
+@user_has_permissions()
+def uploaded_letters(service_id, letter_print_day):
+    page = get_page_from_request()
+    if page is None:
+        abort(404, "Invalid page argument ({}).".format(request.args.get('page')))
+    uploaded_letters = upload_api_client.get_letters_by_service_and_print_day(
+        current_service.id, letter_print_day=letter_print_day, page=page,
+    )
+
+    prev_page = None
+    if uploaded_letters['links'].get('prev'):
+        prev_page = generate_previous_dict('.uploaded_letters', service_id, page, url_args={
+            'letter_print_day': letter_print_day
+        })
+    next_page = None
+    if uploaded_letters['links'].get('next'):
+        next_page = generate_next_dict('.uploaded_letters', service_id, page, url_args={
+            'letter_print_day': letter_print_day
+        })
+    return render_template(
+        'views/uploads/uploaded-letters.html',
+        notifications=add_preview_of_content_uploaded_letters(
+            uploaded_letters['notifications']
+        ),
+        prev_page=prev_page,
+        next_page=next_page,
+        show_pagination=True,
+        total=uploaded_letters['total'],
+        letter_printing_statement=get_letter_printing_statement(
+            'created',
+            letter_print_day,
+        ),
+        letter_print_day=letter_print_day,
+    )
+
+
+def add_preview_of_content_uploaded_letters(notifications):
+
+    for notification in notifications:
+        yield(dict(
+            preview_of_content=', '.join(notification.pop('to').splitlines()),
+            to=notification['client_reference'],
+            **notification
+        ))
+
+
 @main.route("/services/<uuid:service_id>/upload-letter", methods=['GET', 'POST'])
 @user_has_permissions('send_messages')
 def upload_letter(service_id):