{"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(d):\n    return int((d * 100).quantize(Decimal(1), rounding=ROUND_HALF_UP))\n\n\ndef _principal(lines, mode):\n    if mode == 'per_line':\n        return sum(_cents(Decimal(str(x))) for x in lines)\n    total = sum((Decimal(str(x)) for x in lines), Decimal(0))\n    return _cents(total)\n\n\ndef _events(events, policy):\n    d = {}\n    for e in events 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    lst = list(d.values())\n    if policy['refunds_first']:\n        lst = [e for e in lst if e['kind'] == 'refund'] + [e for e in lst if e['kind'] != 'refund']\n    return lst\n\n\ndef _one(inv, policy):\n    principal = _principal(inv.get('lines') or [], policy['rounding'])\n    fee = int(inv.get('fee_cents', 0) or 0)\n    charge = principal + fee\n    if charge < policy['min_invoice_cents']:\n        return None\n    ceiling = principal + fee if policy['fee_refundable'] else principal\n    active = True\n    tomb = False\n    refunded = 0\n    created = inv['created']\n    limit = policy['max_refund_age_days']\n    for e in _events(inv.get('events'), policy):\n        kind = e['kind']\n        if kind == 'void':\n            active = False\n            if policy['void_is_tombstone']:\n                tomb = True\n        elif kind == 'restore':\n            if not active and not tomb:\n                active = True\n        elif kind == 'refund':\n            if not active:\n                continue\n            age = e['day'] - created\n            if age < 0:\n                continue\n            if age > limit or (age == limit and not policy['inclusive_limit']):\n                continue\n            amt = int(e['cents'])\n            remaining = ceiling - refunded\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    status = status.upper() if policy['status_case'] == 'upper' else status.lower()\n    return {'id': inv['id'], 'charge': charge, 'refunded': refunded,\n            'balance': charge - refunded, 'status': status}, created\n\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        r = _one(inv, policy)\n        if r is not None:\n            out.append(r)\n    if policy['order'] == 'created':\n        out.sort(key=lambda t: (t[1], t[0]['id']))\n    else:\n        out.sort(key=lambda t: t[0]['id'])\n    return {'invoices': [t[0] for t in out]}\n","policy.py":"POLICY = {\n    'duplicate_event': 'first',\n    'inclusive_limit': True,\n    'max_refund_age_days': 30,\n    'rounding': 'per_line',\n    'order': 'id',\n    'refund_overflow': 'cap',\n    'refunds_first': True,\n    'void_is_tombstone': True,\n    'min_invoice_cents': 10,\n    'status_case': 'lower',\n    'currency': 'USD',\n    'fee_refundable': True,\n}\n","helpers.py":"# Optional pure helper functions.\n"}}