{"files": {"main.py": "from core import run\nfrom policy import POLICY\ndef evaluate(payload):\n    return run(payload, POLICY)\n", "policy.py": "POLICY = {\n    'duplicate_event': 'last',\n    'inclusive_limit': False,\n    'max_refund_age_days': 45,\n    'rounding': 'invoice',\n    'order': 'created',\n    'refund_overflow': 'reject',\n    'refunds_first': False,\n    'void_is_tombstone': False,\n    'min_invoice_cents': 25,\n    'status_case': 'upper',\n    'currency': 'CAD',\n    'fee_refundable': False,\n}\n", "helpers.py": "from decimal import Decimal, ROUND_HALF_UP\n\ndef to_cents(d):\n    return int((d * 100).quantize(Decimal('1'), rounding=ROUND_HALF_UP))\n\ndef charge_cents(lines, fee, rounding):\n    ds = [Decimal(str(x)) for x in lines]\n    if rounding == 'per_line':\n        total = sum((to_cents(d) for d in ds), 0)\n    else:\n        total = to_cents(sum(ds, Decimal(0)))\n    return total + int(fee)\n", "core.py": "from helpers import charge_cents\n\ndef _events(evs, policy):\n    d = {}\n    for e in evs or []:\n        k = e['eid']\n        if k in d:\n            if policy['duplicate_event'] == 'last':\n                d[k] = e\n        else:\n            d[k] = e\n    out = list(d.values())\n    if policy['refunds_first']:\n        out = [e for e in out if e['kind'] == 'refund'] + [e for e in out if e['kind'] != 'refund']\n    return out\n\ndef run(payload, policy):\n    if isinstance(payload, dict):\n        invs = payload.get('invoices') or []\n    else:\n        invs = payload or []\n    res = []\n    for inv in invs:\n        if inv.get('currency') != policy['currency']:\n            continue\n        fee = int(inv.get('fee_cents', 0))\n        charge = charge_cents(inv.get('lines', []), fee, policy['rounding'])\n        if charge < policy['min_invoice_cents']:\n            continue\n        created = inv['created']\n        ceiling = charge if policy['fee_refundable'] else charge - fee\n        active = True\n        tomb = False\n        refunded = 0\n        for e in _events(inv.get('events'), policy):\n            k = e['kind']\n            if k == 'void':\n                active = False\n                if policy['void_is_tombstone']:\n                    tomb = True\n            elif k == 'restore':\n                if not active and not tomb:\n                    active = True\n            elif k == 'refund':\n                if not active:\n                    continue\n                age = e['day'] - created\n                lim = policy['max_refund_age_days']\n                ok = age >= 0 and (age <= lim if policy['inclusive_limit'] else age < lim)\n                if not ok:\n                    continue\n                c = int(e['cents'])\n                room = ceiling - refunded\n                if c > room:\n                    if policy['refund_overflow'] == 'cap':\n                        c = max(room, 0)\n                    else:\n                        continue\n                refunded += c\n        if not active:\n            st = 'void'\n        elif refunded == charge:\n            st = 'refunded'\n        else:\n            st = 'open'\n        st = st.upper() if policy['status_case'] == 'upper' else st.lower()\n        res.append({'id': inv['id'], 'charge': charge, 'refunded': refunded,\n                    'balance': charge - refunded, 'status': st, '_c': created})\n    if policy['order'] == 'created':\n        res.sort(key=lambda r: (r['_c'], r['id']))\n    else:\n        res.sort(key=lambda r: r['id'])\n    for r in res:\n        del r['_c']\n    return {'invoices': res}\n"}}