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