{"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_interval, overlaps\n\n\ndef run(payload, policy):\n    now = parse_instant(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        appointment_id = row['id']\n        if appointment_id not in retained or policy['duplicate_policy'] == 'last':\n            retained[appointment_id] = (index, row)\n\n    results = {'selected': [], 'blocked': [], 'rejected': []}\n    candidates = []\n    for appointment_id, (index, row) in retained.items():\n        try:\n            interval = prepare_interval(row, earliest, policy, zone)\n        except (KeyError, TypeError, ValueError, OverflowError):\n            interval = None\n        if interval is None:\n            results['rejected'].append((index, appointment_id))\n        else:\n            start, end, priority, cancelled = interval\n            candidates.append((priority, index, appointment_id, start, end, cancelled))\n\n    candidates.sort(key=lambda item: (\n        -item[0] if policy['priority_high_first'] else item[0],\n        item[1],\n    ))\n    accepted = []\n    for priority, index, appointment_id, 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, appointment_id))\n            continue\n        accepted.append((start, end))\n        category = 'blocked' if cancelled else 'selected'\n        results[category].append((index, appointment_id))\n\n    sort_key = (lambda item: item[1]) if policy['report_order'] == 'id' else (lambda item: item[0])\n    return {\n        category: [appointment_id for index, appointment_id in sorted(entries, key=sort_key)]\n        for category, entries in results.items()\n    }\n","policy.py":"POLICY = {\n    'cutoff_hour': 18,\n    'cutoff_inclusive': False,\n    'lead_minutes': 60,\n    'timezone': 'UTC',\n    'adjacency_allowed': False,\n    'cancelled_blocks': False,\n    'duplicate_policy': 'last',\n    'duration_max': 90,\n    'capacity': 2,\n    'report_order': 'input',\n    'blackout_day': '2026-11-02',\n    'priority_high_first': False,\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 TypeError('Datetime must be an offset-aware ISO string')\n    if value.endswith('Z'):\n        value = value[:-1] + '+00:00'\n    parsed = datetime.fromisoformat(value)\n    if parsed.tzinfo is None or parsed.utcoffset() is None:\n        raise ValueError('Datetime must include an offset')\n    return parsed.astimezone(timezone.utc)\n\n\ndef prepare_interval(row, earliest, policy, zone):\n    duration = row['duration']\n    priority = row['priority']\n    cancelled = row['cancelled']\n    if isinstance(duration, bool) or not isinstance(duration, (int, float)):\n        return None\n    if not isfinite(duration) or not 0 < duration <= policy['duration_max']:\n        return None\n    if isinstance(priority, bool) or not isinstance(priority, int):\n        return None\n    if not isinstance(cancelled, bool):\n        return None\n    if cancelled and not policy['cancelled_blocks']:\n        return None\n\n    start = parse_instant(row['start'])\n    if start < earliest:\n        return None\n    end = start + timedelta(minutes=duration)\n    local_start = start.astimezone(zone)\n    if local_start.date().isoformat() == policy['blackout_day']:\n        return None\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            return None\n    elif end >= cutoff:\n        return None\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"}}