feat: add per-member payment frequencies

src/ccma/rules/scripts/contribution_claims.py

@@ -9,6 +9,21 @@ from ccma.rules.scripts._shared import CONTRIBUTION_STATUSES
 RULE_ID = "contribution-claims"
 ORDER = 40
 CENT = Decimal("0.01")
+MONTH_NAMES = (
+    "",
+    "Januar",
+    "Februar",
+    "März",
+    "April",
+    "Mai",
+    "Juni",
+    "Juli",
+    "August",
+    "September",
+    "Oktober",
+    "November",
+    "Dezember",
+)
 
 
 def evaluate(context: RuleContext):
@@ -85,6 +100,26 @@ def _membership_claims(
             ("first-half", 1, 6, _due_date(year, configured_due_dates[0], "01-31")),
             ("second-half", 7, 12, _due_date(year, configured_due_dates[1], "07-31")),
         ]
+    elif member.payment_frequency == "quarterly":
+        periods = [
+            (
+                f"quarter-{quarter}",
+                first_month,
+                first_month + 2,
+                _recurring_due_date(year, first_month, rule.get("annual_due"), "01-31"),
+            )
+            for quarter, first_month in enumerate((1, 4, 7, 10), start=1)
+        ]
+    elif member.payment_frequency == "monthly":
+        periods = [
+            (
+                f"month-{month:02d}",
+                month,
+                month,
+                _recurring_due_date(year, month, rule.get("annual_due"), "01-31"),
+            )
+            for month in range(1, 13)
+        ]
     else:
         periods = [("annual", 1, 12, _due_date(year, rule.get("annual_due"), "01-31"))]
 
@@ -168,7 +203,21 @@ def _due_date(year: int, value, fallback: str) -> date:
         return date(year, month, day)
 
 
+def _recurring_due_date(year: int, month: int, value, fallback: str) -> date:
+    try:
+        _configured_month, day = (int(part) for part in str(value or fallback).split("-", 1))
+    except (TypeError, ValueError):
+        day = int(fallback.split("-", 1)[1])
+    return date(year, month, min(day, calendar.monthrange(year, month)[1]))
+
+
 def _title(year: int, suffix: str) -> str:
+    if suffix.startswith("month-"):
+        month = int(suffix.removeprefix("month-"))
+        return f"Mitgliedsbeitrag {MONTH_NAMES[month]} {year}"
+    if suffix.startswith("quarter-"):
+        quarter = int(suffix.removeprefix("quarter-"))
+        return f"Mitgliedsbeitrag {quarter}. Quartal {year}"
     if suffix == "first-half":
         return f"Mitgliedsbeitrag 1. Halbjahr {year}"
     if suffix == "second-half":