remove dupe of get_letter_timings

it was moved from admin to utils a while ago

app/main/views/jobs.py

@@ -12,6 +12,7 @@ from flask import (
     url_for,
 )
 from flask_login import current_user, login_required
+from notifications_utils.letter_timings import get_letter_timings
 from notifications_utils.template import Template, WithSubjectTemplate
 
 from app import (
@@ -28,7 +29,6 @@ from app.utils import (
     generate_next_dict,
     generate_notifications_csv,
     generate_previous_dict,
-    get_letter_timings,
     get_page_from_request,
     get_time_left,
     parse_filter_args,

app/main/views/notifications.py

@@ -16,6 +16,7 @@ from flask import (
 )
 from flask_login import login_required
 from notifications_python_client.errors import APIError
+from notifications_utils.letter_timings import get_letter_timings
 from notifications_utils.pdf import pdf_page_count
 
 from app import (
@@ -33,7 +34,6 @@ from app.utils import (
     FAILURE_STATUSES,
     generate_notifications_csv,
     get_help_argument,
-    get_letter_timings,
     get_template,
     parse_filter_args,
     set_status_filters,

app/utils.py

@@ -2,7 +2,6 @@ import csv
 import os
 import re
 import unicodedata
-from collections import namedtuple
 from datetime import datetime, timedelta, timezone
 from functools import wraps
 from io import StringIO
@@ -356,37 +355,6 @@ def email_or_sms_not_enabled(template_type, permissions):
     return (template_type in ['email', 'sms']) and (template_type not in permissions)
 
 
-def get_letter_timings(upload_time):
-
-    LetterTimings = namedtuple(
-        'LetterTimings',
-        'printed_by, is_printed, earliest_delivery, latest_delivery'
-    )
-
-    # shift anything after 5pm to the next day
-    processing_day = gmt_timezones(upload_time) + timedelta(hours=(7))
-
-    print_day, earliest_delivery, latest_delivery = (
-        processing_day + timedelta(days=days)
-        for days in {
-            'Wednesday': (1, 3, 5),
-            'Thursday': (1, 4, 5),
-            'Friday': (3, 5, 6),
-            'Saturday': (2, 4, 5),
-        }.get(processing_day.strftime('%A'), (1, 3, 4))
-    )
-
-    printed_by = print_day.astimezone(pytz.timezone('Europe/London')).replace(hour=15, minute=0)
-    now = datetime.utcnow().replace(tzinfo=pytz.timezone('Europe/London'))
-
-    return LetterTimings(
-        printed_by=printed_by,
-        is_printed=(now > printed_by),
-        earliest_delivery=earliest_delivery,
-        latest_delivery=latest_delivery,
-    )
-
-
 def gmt_timezones(date):
     date = dateutil.parser.parse(date)
     forced_utc = date.replace(tzinfo=pytz.utc)