{"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 timedelta\nfrom zoneinfo import ZoneInfo\n\nfrom helpers import parse_instant, prepare_appointment, overlaps\n\n\ndef run(payload, policy):\n    zone = ZoneInfo(policy['timezone'])\n    now = parse_instant(payload['now'])\n    earliest = now + timedelta(minutes=policy['lead_minutes'])\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            start, end, priority, cancelled = prepare_appointment(\n                row, policy, zone, earliest\n            )\n        except (ValueError, TypeError, KeyError, OverflowError):\n            results['rejected'].append((identifier, index))\n            continue\n        candidates.append((priority, index, identifier, start, end, cancelled))\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,\n                     policy['adjacency_allowed'])\n            for other_start, other_end in accepted\n        )\n        if count >= policy['capacity']:\n            results['rejected'].append((identifier, index))\n            continue\n        accepted.append((start, end))\n        category = 'blocked' if cancelled else 'selected'\n        results[category].append((identifier, index))\n\n    order_column = 0 if policy['report_order'] == 'id' else 1\n    return {\n        category: [identifier for identifier, index in sorted(\n            entries, key=lambda entry: entry[order_column]\n        )]\n        for category, entries in results.items()\n    }\n","policy.py":"POLICY = {\n    'cutoff_hour': 17,\n    'cutoff_inclusive': True,\n    'lead_minutes': 30,\n    'timezone': 'America/New_York',\n    'adjacency_allowed': True,\n    'cancelled_blocks': True,\n    'duplicate_policy': 'first',\n    'duration_max': 120,\n    'capacity': 1,\n    'report_order': 'id',\n    'blackout_day': '2026-11-01',\n    'priority_high_first': True,\n}\n","helpers.py":"from datetime import datetime, time, timedelta, timezone\nfrom math import isfinite\n\n\ndef parse_instant(value):\n    if not isinstance(value, str):\n        raise ValueError('Expected an offset-aware ISO datetime')\n    normalized = value[:-1] + '+00:00' if value.endswith('Z') else value\n    instant = datetime.fromisoformat(normalized)\n    if instant.tzinfo is None or instant.utcoffset() is None:\n        raise ValueError('Datetime must include an offset')\n    return instant.astimezone(timezone.utc)\n\n\ndef prepare_appointment(row, policy, zone, earliest):\n    duration = row['duration']\n    if isinstance(duration, bool) or not isinstance(duration, (int, float)):\n        raise ValueError('Invalid duration')\n    if not isfinite(duration) or not 0 < duration <= policy['duration_max']:\n        raise ValueError('Duration outside permitted range')\n\n    priority = row['priority']\n    if isinstance(priority, bool) or not isinstance(priority, int):\n        raise ValueError('Priority must be an integer')\n    cancelled = row['cancelled']\n    if not isinstance(cancelled, bool):\n        raise ValueError('Cancelled must be a boolean')\n    if cancelled and not policy['cancelled_blocks']:\n        raise ValueError('Cancelled appointment cannot reserve capacity')\n\n    start = parse_instant(row['start'])\n    end = start + timedelta(minutes=duration)\n    if start < earliest:\n        raise ValueError('Insufficient lead time')\n\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(hour=policy['cutoff_hour']), tzinfo=zone\n    ).astimezone(timezone.utc)\n    if policy['cutoff_inclusive']:\n        if end > cutoff:\n            raise ValueError('Ends after cutoff')\n    elif end >= cutoff:\n        raise ValueError('Ends at or after cutoff')\n    return start, end, priority, cancelled\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"}}