wip reporting

order-events/app/utils.py

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+import calendar
+from datetime import date
+
+from layercake.dateutils import now
+
+
+def get_billing_period(
+    billing_day: int,
+    year: int | None = None,
+    month: int | None = None,
+) -> tuple[date, date]:
+    today = now()
+    year_ = year or today.year
+    month_ = month or today.month
+
+    _, last_day = calendar.monthrange(year_, month_)
+    start_day = min(billing_day, last_day)
+    start_date = date(year_, month_, start_day)
+
+    if month_ == 12:
+        next_month = 1
+        next_year = year_ + 1
+    else:
+        next_month = month_ + 1
+        next_year = year_
+
+    _, last_day_next_month = calendar.monthrange(next_year, next_month)
+    end_day = min(billing_day, last_day_next_month) - 1
+
+    if end_day == 0:
+        end_date = date(year_, month_, last_day)
+    else:
+        end_date = date(next_year, next_month, end_day)
+
+    return start_date, end_date