{"files":{"main.py":"from core import run\nfrom policy import POLICY\ndef evaluate(payload):\n    return run(payload, POLICY)\n","core.py":"from helpers import to_cents, line_total, fmt_status\n\n\ndef _invoices(payload):\n    if payload is None:\n        return []\n    if isinstance(payload, dict):\n        inv = payload.get('invoices')\n        return list(inv) if inv else []\n    return list(payload)\n\n\ndef _dedup(events, mode):\n    order = []\n    vals = {}\n    for e in events:\n        k = e.get('eid')\n        if k not in vals:\n            order.append(k)\n            vals[k] = e\n        elif mode == 'last':\n            vals[k] = e\n    return [vals[k] for k in order]\n\n\ndef run(payload, policy):\n    out = []\n    for inv in _invoices(payload):\n        if inv.get('currency') != policy['currency']:\n            continue\n        principal = line_total(inv.get('lines', []), policy['rounding'])\n        fee = int(inv.get('fee_cents', 0))\n        charge = principal + fee\n        if charge < policy['min_invoice_cents']:\n            continue\n        events = _dedup(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        ceiling = principal + (fee if policy['fee_refundable'] else 0)\n        created = inv.get('created')\n        active = True\n        tomb = False\n        refunded = 0\n        for e in events:\n            kind = e.get('kind')\n            if kind == 'void':\n                active = False\n                if policy['void_is_tombstone']:\n                    tomb = True\n            elif kind == 'restore':\n                if not tomb:\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                if age < 0 or age > lim or (age == lim and not policy['inclusive_limit']):\n                    continue\n                cents = int(e.get('cents', 0))\n                remaining = ceiling - refunded\n                if cents > remaining:\n                    if policy['refund_overflow'] == 'cap':\n                        cents = remaining\n                    else:\n                        continue\n                refunded += cents\n        if not active:\n            status = 'void'\n        elif refunded == charge:\n            status = 'refunded'\n        else:\n            status = 'open'\n        out.append({'id': inv.get('id'), 'charge': charge, 'refunded': refunded,\n                    'balance': charge - refunded,\n                    'status': fmt_status(status, policy['status_case']),\n                    '_c': 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    'rounding': 'per_line',\n    'min_invoice_cents': 10,\n    'duplicate_event': 'first',\n    'refunds_first': True,\n    'void_is_tombstone': True,\n    'inclusive_limit': True,\n    'max_refund_age_days': 30,\n    'refund_overflow': 'cap',\n    'fee_refundable': True,\n    'order': 'id',\n    'status_case': 'lower',\n}\n","helpers.py":"from decimal import Decimal, ROUND_HALF_UP\n\n\ndef to_cents(d):\n    return int((Decimal(d) * 100).quantize(Decimal(1), rounding=ROUND_HALF_UP))\n\n\ndef line_total(lines, rounding):\n    if rounding == 'per_line':\n        return sum(to_cents(Decimal(str(x))) for x in lines)\n    total = sum((Decimal(str(x)) for x in lines), Decimal(0))\n    return to_cents(total)\n\n\ndef fmt_status(s, case):\n    if case == 'upper':\n        return s.upper()\n    if case == 'title':\n        return s.capitalize()\n    return s.lower()\n"}}