{"files":{"main.py":"from core import run\nfrom policy import POLICY\ndef evaluate(payload):\n    return run(payload, POLICY)\n","policy.py":"POLICY = {\n    'currency': 'USD',\n    'rounding': 'per_line',\n    'min_invoice_cents': 10,\n    'duplicate_event': 'first',\n    'refunds_first': True,\n    'void_is_tombstone': True,\n    'max_refund_age_days': 30,\n    'inclusive_limit': True,\n    'fee_refundable': True,\n    'refund_overflow': 'cap',\n    'status_case': 'lower',\n    'order': 'id',\n}\n","helpers.py":"from decimal import Decimal, ROUND_HALF_UP\n\ndef to_cents(d):\n    return int((Decimal(d) * 100).quantize(Decimal(1), rounding=ROUND_HALF_UP))\n\ndef line_cents(lines, rounding):\n    if rounding == 'per_line':\n        return sum(to_cents(str(x)) for x in lines)\n    total = sum((Decimal(str(x)) for x in lines), Decimal(0))\n    return to_cents(total)\n","core.py":"from helpers import line_cents\n\ndef run(payload, policy):\n    if isinstance(payload, dict):\n        invs = payload.get('invoices') or []\n    else:\n        invs = payload or []\n    out = []\n    for inv in invs:\n        if inv.get('currency') != policy['currency']:\n            continue\n        fee = int(inv.get('fee_cents', 0))\n        principal = line_cents(inv.get('lines', []), policy['rounding'])\n        charge = principal + fee\n        if charge < policy['min_invoice_cents']:\n            continue\n        ded = {}\n        for ev in inv.get('events', []) or []:\n            k = ev['eid']\n            if k in ded:\n                if policy['duplicate_event'] == 'last':\n                    ded[k] = ev\n            else:\n                ded[k] = ev\n        evs = list(ded.values())\n        if policy['refunds_first']:\n            evs = [e for e in evs if e['kind'] == 'refund'] + [e for e in evs if e['kind'] != 'refund']\n        active = True\n        voided = False\n        refunded = 0\n        ceiling = principal + fee if policy['fee_refundable'] else principal\n        created = inv['created']\n        for e in evs:\n            kind = e['kind']\n            if kind == 'void':\n                active = False\n                voided = True\n            elif kind == 'restore':\n                if voided and policy['void_is_tombstone']:\n                    continue\n                active = True\n            elif kind == 'refund':\n                if not active:\n                    continue\n                age = e['day'] - created\n                lim = policy['max_refund_age_days']\n                if age < 0:\n                    continue\n                if not (age < lim or (policy['inclusive_limit'] and age == lim)):\n                    continue\n                amt = int(e['cents'])\n                rem = ceiling - refunded\n                if amt > rem:\n                    if policy['refund_overflow'] == 'cap':\n                        amt = rem\n                    else:\n                        continue\n                refunded += amt\n        if not active:\n            st = 'void'\n        elif refunded == charge:\n            st = 'refunded'\n        else:\n            st = 'open'\n        if policy['status_case'] == 'upper':\n            st = st.upper()\n        out.append({'id': inv['id'], 'charge': charge, 'refunded': refunded,\n                    'balance': charge - refunded, 'status': st, '_c': created})\n    if policy['order'] == 'created':\n        out.sort(key=lambda r: (r['_c'], r['id']))\n    else:\n        out.sort(key=lambda r: r['id'])\n    for r in out:\n        del r['_c']\n    return {'invoices': out}\n"}}