feat: add scriptable housekeeper rule engine

src/ccma/rules/scripts/__init__.py

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+"""Built-in housekeeper rules. Store rules can override these files by name."""

src/ccma/rules/scripts/_shared.py

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+from __future__ import annotations
+
+import calendar
+from datetime import date
+
+CONTRIBUTION_STATUSES = {
+    "accepted_pending_payment",
+    "active",
+    "suspended_contribution",
+    "resigned_end_of_year",
+}
+
+
+def date_in_year(source: date, year: int) -> date:
+    return date(year, source.month, min(source.day, calendar.monthrange(year, source.month)[1]))
+
+
+def relative_title(name: str, delta: int, occasion: str) -> str:
+    if delta == 0:
+        return f"{name} hat heute {occasion}"
+    unit = "Tag" if abs(delta) == 1 else "Tagen"
+    if delta > 0:
+        return f"{name} hat in {delta} {unit} {occasion}"
+    return f"{name} hatte vor {-delta} {unit} {occasion}"

src/ccma/rules/scripts/birthdate_check.py

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+from ccma.domain.dates import DateValidationError, validate_member_dates
+from ccma.rules.api import RuleContext, task
+
+RULE_ID = "birthdate-check"
+ORDER = 10
+
+
+def evaluate(context: RuleContext):
+    member = context.member
+    if not member.birth_date.strip():
+        return [
+            task(
+                rule_id=RULE_ID,
+                member=member,
+                key_suffix="missing",
+                severity="warning",
+                title=f"{member.display_name}: Geburtsdatum fehlt",
+                detail="Das Geburtsdatum muss in der Mitgliederakte ergänzt werden.",
+                code="missing_birth_date",
+            )
+        ]
+    try:
+        validate_member_dates(
+            birth_date=member.birth_date,
+            accepted_at=member.accepted_at,
+            membership_started_at=member.membership_started_at,
+            today=context.today,
+        )
+    except DateValidationError as exc:
+        return [
+            task(
+                rule_id=RULE_ID,
+                member=member,
+                key_suffix="invalid",
+                severity="error",
+                title=f"{member.display_name}: Ungültige Datumsangabe",
+                detail=str(exc),
+                code="invalid_member_dates",
+            )
+        ]
+    return []

src/ccma/rules/scripts/birthday.py

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+from ccma.domain.dates import DateValidationError, validate_birth_date
+from ccma.rules.api import RuleContext, task
+from ccma.rules.scripts._shared import date_in_year, relative_title
+
+RULE_ID = "birthday"
+ORDER = 20
+
+
+def evaluate(context: RuleContext):
+    member = context.member
+    try:
+        birth_date = validate_birth_date(member.birth_date, today=context.today)
+    except DateValidationError:
+        return []
+    if not birth_date:
+        return []
+    occurrences = [
+        date_in_year(birth_date, year) for year in range(context.today.year - 1, context.today.year + 2)
+    ]
+    occurrence = min(occurrences, key=lambda value: abs((value - context.today).days))
+    delta = (occurrence - context.today).days
+    if delta > context.settings.birthday_days_before or delta < -context.settings.birthday_days_after:
+        return []
+    age = occurrence.year - birth_date.year
+    detail = f"Wird {age} Jahre alt." if delta >= 0 else f"Ist {age} Jahre alt geworden."
+    return [
+        task(
+            rule_id=RULE_ID,
+            member=member,
+            key_suffix=str(occurrence.year),
+            severity="info",
+            title=relative_title(member.display_name, delta, "Geburtstag"),
+            detail=detail,
+            due_date=occurrence,
+        )
+    ]

src/ccma/rules/scripts/claim_status.py

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+from datetime import date
+
+from ccma.rules.api import RuleContext, task
+
+RULE_ID = "claim-status"
+ORDER = 50
+
+
+def evaluate(context: RuleContext):
+    actions = []
+    for claim in context.contributions.claims:
+        if str(claim.get("status", "open")) not in {"open", "partially_paid"}:
+            continue
+        try:
+            due = date.fromisoformat(str(claim.get("due_date", "")))
+        except ValueError:
+            continue
+        delta = (due - context.today).days
+        claim_key = str(claim.get("claim_key") or claim.get("claim_id") or "unknown")
+        title = str(claim.get("title") or "Beitragsforderung")
+        claim_type = str(claim.get("type", ""))
+        if delta < 0:
+            actions.append(
+                task(
+                    rule_id=RULE_ID,
+                    member=context.member,
+                    key_suffix=f"overdue:{claim_key}",
+                    severity="error",
+                    title=f"{context.member.display_name}: {title} überfällig",
+                    detail=f"Fälligkeit war vor {-delta} Tagen.",
+                    due_date=due,
+                    code="initial_payment_overdue" if claim_type == "admission_fee" else "claim_overdue",
+                )
+            )
+        elif delta <= 14:
+            actions.append(
+                task(
+                    rule_id=RULE_ID,
+                    member=context.member,
+                    key_suffix=f"due-soon:{claim_key}",
+                    severity="info",
+                    title=f"{context.member.display_name}: {title} bald fällig",
+                    detail=f"Fälligkeit in {delta} Tagen.",
+                    due_date=due,
+                    code="initial_payment_due_soon" if claim_type == "admission_fee" else "claim_due_soon",
+                )
+            )
+    return actions

src/ccma/rules/scripts/contribution_claims.py

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+import calendar
+from datetime import date, timedelta
+from decimal import ROUND_HALF_UP, Decimal
+
+from ccma.domain.dates import DateValidationError, parse_iso_date
+from ccma.rules.api import RuleContext, create_claim
+from ccma.rules.scripts._shared import CONTRIBUTION_STATUSES
+
+RULE_ID = "contribution-claims"
+ORDER = 40
+CENT = Decimal("0.01")
+
+
+def evaluate(context: RuleContext):
+    member = context.member
+    if member.honorary or member.status not in CONTRIBUTION_STATUSES:
+        return []
+    try:
+        accepted_at = parse_iso_date(member.accepted_at, "Aufnahmebeschluss")
+        started_at = parse_iso_date(member.membership_started_at, "Mitglied seit") or accepted_at
+    except DateValidationError:
+        return []
+    if not accepted_at or not started_at:
+        return []
+
+    actions = []
+    admission_rule = _rule_for(context.repository_config, accepted_at)
+    if admission_rule:
+        admission_fee = Decimal(str(admission_rule.get("admission_fee", "0")))
+        if admission_fee > 0:
+            due_days = int(admission_rule.get("first_payment_due_days_after_acceptance", 28))
+            actions.append(
+                create_claim(
+                    rule_id=RULE_ID,
+                    member=member,
+                    claim_key="admission-fee",
+                    payload={
+                        "type": "admission_fee",
+                        "title": "Aufnahmegebühr",
+                        "amount": _money(admission_fee),
+                        "due_date": (accepted_at + timedelta(days=due_days)).isoformat(),
+                        "calculation": {"rule_id": admission_rule.get("rule_id", "")},
+                    },
+                )
+            )
+
+    for year in (context.today.year, context.today.year + 1):
+        actions.extend(_membership_claims(context, started_at, accepted_at, year))
+    return actions
+
+
+def _membership_claims(context: RuleContext, started_at: date, accepted_at: date, year: int):
+    member = context.member
+    period_start = max(started_at, date(year, 1, 1))
+    if period_start.year > year:
+        return []
+    rule = _rule_for(context.repository_config, period_start)
+    if not rule:
+        return []
+    annual_amount = Decimal(str(rule.get("annual_amount", "0")))
+    issue_days = int(rule.get("issue_days_before_due", 30))
+    due_days_after_entry = int(rule.get("first_payment_due_days_after_acceptance", 28))
+    if annual_amount <= 0:
+        return []
+
+    if member.payment_frequency == "semiannual":
+        configured_due_dates = list(rule.get("semiannual_due") or ["01-31", "07-31"])
+        while len(configured_due_dates) < 2:
+            configured_due_dates.append(("01-31", "07-31")[len(configured_due_dates)])
+        periods = [
+            ("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")),
+        ]
+    else:
+        periods = [("annual", 1, 12, _due_date(year, rule.get("annual_due"), "01-31"))]
+
+    actions = []
+    monthly_amount = annual_amount / Decimal(12)
+    for suffix, first_month, last_month, regular_due in periods:
+        charged_from = max(first_month, period_start.month)
+        months = max(0, last_month - charged_from + 1)
+        if months == 0:
+            continue
+        amount = (monthly_amount * months).quantize(CENT, rounding=ROUND_HALF_UP)
+        entry_year = started_at.year == year
+        issue_date = regular_due - timedelta(days=issue_days)
+        if not entry_year and context.today < issue_date:
+            continue
+        due_date = regular_due
+        if entry_year and regular_due < accepted_at + timedelta(days=due_days_after_entry):
+            due_date = accepted_at + timedelta(days=due_days_after_entry)
+        claim_key = f"membership-fee:{year}:{suffix}"
+        actions.append(
+            create_claim(
+                rule_id=RULE_ID,
+                member=member,
+                claim_key=claim_key,
+                payload={
+                    "type": "membership_fee",
+                    "title": _title(year, suffix),
+                    "amount": _money(amount),
+                    "due_date": due_date.isoformat(),
+                    "service_period": {
+                        "from": date(year, charged_from, 1).isoformat(),
+                        "until": date(year, last_month, calendar.monthrange(year, last_month)[1]).isoformat(),
+                    },
+                    "calculation": {
+                        "rule_id": rule.get("rule_id", ""),
+                        "annual_amount": _money(annual_amount),
+                        "months": months,
+                        "formula": "annual_amount * months / 12",
+                    },
+                },
+            )
+        )
+    return actions
+
+
+def _rule_for(config, target: date):
+    selected = None
+    for rule in config.get("contribution_rules", []):
+        try:
+            valid_from = date.fromisoformat(str(rule.get("valid_from", "")))
+            valid_until_raw = rule.get("valid_until")
+            valid_until = date.fromisoformat(str(valid_until_raw)) if valid_until_raw else None
+        except ValueError:
+            continue
+        if valid_from <= target and (not valid_until or target <= valid_until):
+            if selected is None or valid_from > selected[0]:
+                selected = (valid_from, rule)
+    return selected[1] if selected else None
+
+
+def _money(value: Decimal) -> str:
+    return str(value.quantize(CENT, rounding=ROUND_HALF_UP))
+
+
+def _due_date(year: int, value, fallback: str) -> date:
+    try:
+        month, day = (int(part) for part in str(value or fallback).split("-", 1))
+        return date(year, month, day)
+    except (TypeError, ValueError):
+        month, day = (int(part) for part in fallback.split("-", 1))
+        return date(year, month, day)
+
+
+def _title(year: int, suffix: str) -> str:
+    if suffix == "first-half":
+        return f"Mitgliedsbeitrag 1. Halbjahr {year}"
+    if suffix == "second-half":
+        return f"Mitgliedsbeitrag 2. Halbjahr {year}"
+    return f"Mitgliedsbeitrag {year}"

src/ccma/rules/scripts/membership_anniversary.py

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+from ccma.domain.dates import DateValidationError, parse_iso_date
+from ccma.rules.api import RuleContext, task
+from ccma.rules.scripts._shared import relative_title
+
+RULE_ID = "membership-anniversary"
+ORDER = 30
+
+
+def evaluate(context: RuleContext):
+    member = context.member
+    try:
+        started_at = parse_iso_date(member.membership_started_at, "Mitglied seit")
+    except DateValidationError:
+        return []
+    if not started_at:
+        return []
+    actions = []
+    for interval in context.settings.anniversary_intervals:
+        try:
+            target = interval.target_date(started_at)
+        except (OverflowError, ValueError):
+            continue
+        delta = (target - context.today).days
+        if (
+            delta > context.settings.anniversary_days_before
+            or delta < -context.settings.anniversary_days_after
+        ):
+            continue
+        occasion = _anniversary_name(interval)
+        actions.append(
+            task(
+                rule_id=RULE_ID,
+                member=member,
+                key_suffix=f"{interval.value}{interval.unit}",
+                severity="info",
+                title=relative_title(member.display_name, delta, occasion),
+                detail=f"Mitglied seit {started_at:%d.%m.%Y}.",
+                due_date=target,
+                code="membership_anniversary",
+            )
+        )
+    return actions
+
+
+def _anniversary_name(interval):
+    if interval.unit == "D":
+        return f"{interval.value}-Tage-Mitgliedsjubiläum"
+    if interval.unit == "M":
+        return f"{interval.value}-Monats-Mitgliedsjubiläum"
+    return f"{interval.value}-jähriges Mitgliedsjubiläum"