{"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(s):\n    return int((Decimal(str(s).strip()) * 100).quantize(Decimal(1), rounding=ROUND_HALF_UP))\n\n\ndef _principal(lines, mode):\n    if mode == 'per_line':\n        return sum(_cents(x) for x in lines)\n    total = sum((Decimal(str(x).strip()) for x in lines), Decimal(0))\n    return int((total * 100).quantize(Decimal(1), rounding=ROUND_HALF_UP))\n\n\ndef _dedupe(events, mode):\n    d = {}\n    for e in events:\n        k = e['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 _status(s, case):\n    return s.upper() if case == 'upper' else s\n\n\ndef run(payload, policy):\n    out = []\n    invoices = (payload or {}).get('invoices') or []\n    for inv in invoices:\n        if inv['currency'] != policy['currency']:\n            continue\n        principal = _principal(inv['lines'], policy['rounding'])\n        charge = principal + inv['fee_cents']\n        if charge < policy['min_invoice_cents']:\n            continue\n        events = _dedupe(inv.get('events') or [], policy['duplicate_event'])\n        if policy['refunds_first']:\n            events = [e for e in events if e['kind'] == 'refund'] + [e for e in events if e['kind'] != 'refund']\n        active = True\n        tomb = False\n        refunded = 0\n        ceiling = charge if policy['fee_refundable'] else principal\n        for e in events:\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 tomb:\n                    active = True\n            elif k == 'refund':\n                if not active:\n                    continue\n                age = e['day'] - inv['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                remaining = ceiling - refunded\n                amt = e['cents']\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            st = 'void'\n        elif refunded == charge:\n            st = 'refunded'\n        else:\n            st = 'open'\n        out.append({'id': inv['id'], 'charge': charge, 'refunded': refunded,\n                    'balance': charge - refunded, 'status': _status(st, policy['status_case']),\n                    '_c': inv['created']})\n    if policy['order'] == 'created_id':\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","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"}}