{
  "files": {
    "main.py": "from core import run\nfrom policy import POLICY\n\n\ndef evaluate(payload):\n    return run(payload, POLICY)\n",
    "core.py": "from datetime import datetime, time, timedelta, timezone\nfrom zoneinfo import ZoneInfo\n\nfrom helpers import parse_utc, overlaps\n\n\ndef run(payload, policy):\n    now = parse_utc(payload['now'])\n    earliest = now + timedelta(minutes=policy['lead_minutes'])\n    zone = ZoneInfo(policy['timezone'])\n\n    retained = {}\n    for index, row in enumerate(payload['appointments']):\n        identifier = row['id']\n        if identifier not in retained or policy['duplicate_policy'] == 'last':\n            retained[identifier] = (index, row)\n\n    results = {'selected': [], 'blocked': [], 'rejected': []}\n    candidates = []\n    for identifier, (index, row) in retained.items():\n        try:\n            duration = row['duration']\n            priority = row['priority']\n            cancelled = row['cancelled']\n            if type(duration) is not int or not 0 < duration <= policy['duration_max']:\n                raise ValueError('Invalid duration')\n            if type(priority) is not int or type(cancelled) is not bool:\n                raise ValueError('Invalid priority or cancellation flag')\n            if cancelled and not policy['cancelled_blocks']:\n                raise ValueError('Cancelled appointment')\n\n            start = parse_utc(row['start'])\n            end = start + timedelta(minutes=duration)\n            if start < earliest:\n                raise ValueError('Insufficient lead time')\n            local_start = start.astimezone(zone)\n            if local_start.date().isoformat() == policy['blackout_day']:\n                raise ValueError('Blackout day')\n            cutoff = datetime.combine(\n                local_start.date(), time(policy['cutoff_hour'], 0), tzinfo=zone\n            ).astimezone(timezone.utc)\n            if policy['cutoff_inclusive']:\n                if end > cutoff:\n                    raise ValueError('After cutoff')\n            elif end >= cutoff:\n                raise ValueError('At or after cutoff')\n\n            candidates.append((priority, index, identifier, start, end, cancelled))\n        except (ValueError, TypeError, KeyError, OverflowError):\n            results['rejected'].append((index, identifier))\n\n    candidates.sort(key=lambda item: (\n        -item[0] if policy['priority_high_first'] else item[0], item[1]\n    ))\n    accepted = []\n    for priority, index, identifier, start, end, cancelled in candidates:\n        count = sum(\n            overlaps(start, end, other_start, other_end, policy['adjacency_allowed'])\n            for other_start, other_end in accepted\n        )\n        if count >= policy['capacity']:\n            results['rejected'].append((index, identifier))\n            continue\n        accepted.append((start, end))\n        category = 'blocked' if cancelled else 'selected'\n        results[category].append((index, identifier))\n\n    order_key = (lambda item: item[1]) if policy['report_order'] == 'id' else (lambda item: item[0])\n    return {\n        category: [identifier for index, identifier in sorted(items, key=order_key)]\n        for category, items in results.items()\n    }\n",
    "policy.py": "POLICY = {\n    'adjacency_allowed': True,\n    'blackout_day': '2026-11-01',\n    'cancelled_blocks': True,\n    'capacity': 1,\n    'cutoff_hour': 17,\n    'cutoff_inclusive': True,\n    'duplicate_policy': 'first',\n    'duration_max': 120,\n    'lead_minutes': 30,\n    'priority_high_first': True,\n    'report_order': 'id',\n    'timezone': 'America/New_York',\n}\n",
    "helpers.py": "from datetime import datetime, timezone\n\n\ndef parse_utc(value):\n    if not isinstance(value, str):\n        raise ValueError('Expected ISO datetime string')\n    parsed = datetime.fromisoformat(value[:-1] + '+00:00' if value.endswith('Z') else value)\n    if parsed.tzinfo is None or parsed.utcoffset() is None:\n        raise ValueError('Datetime must be offset-aware')\n    return parsed.astimezone(timezone.utc)\n\n\ndef overlaps(start, end, other_start, other_end, adjacency_allowed):\n    if adjacency_allowed:\n        return start < other_end and other_start < end\n    return start <= other_end and other_start <= end\n"
  }
}