"""
告警查询工具：统计、列表、详情
"""

import json
from datetime import timedelta
from typing import Optional
from langchain_core.tools import tool
from langchain_core.runnables import RunnableConfig

from app.utils.logger import logger
from app.utils.timezone import beijing_now


# 告警类型/级别/状态 中文映射
ALARM_TYPE_NAMES = {
    "leave_post": "人员离岗", "intrusion": "周界入侵",
    "illegal_parking": "车辆违停", "vehicle_congestion": "车辆拥堵",
}
ALARM_LEVEL_NAMES = {0: "紧急", 1: "重要", 2: "普通", 3: "轻微"}
ALARM_STATUS_NAMES = {
    "NEW": "待处理", "CONFIRMED": "处理中",
    "FALSE": "误报", "CLOSED": "已关闭",
}


def _parse_time_range(time_range: str):
    """解析时间范围，返回 (start_time, label)"""
    now = beijing_now()
    if time_range == "week":
        start = now - timedelta(days=now.weekday())
        start = start.replace(hour=0, minute=0, second=0, microsecond=0)
        return start, "本周"
    elif time_range == "month":
        start = now.replace(day=1, hour=0, minute=0, second=0, microsecond=0)
        return start, "本月"
    else:
        start = now.replace(hour=0, minute=0, second=0, microsecond=0)
        return start, "今日"


def _get_camera_display_name(device_id: str) -> str:
    """同步获取摄像头显示名称"""
    try:
        import asyncio
        from app.services.camera_name_service import get_camera_name_service
        camera_service = get_camera_name_service()
        loop = asyncio.get_event_loop()
        if loop.is_running():
            import concurrent.futures
            with concurrent.futures.ThreadPoolExecutor() as pool:
                cam_info = pool.submit(
                    asyncio.run, camera_service.get_camera_info(device_id)
                ).result(timeout=5)
        else:
            cam_info = asyncio.run(camera_service.get_camera_info(device_id))
        return camera_service.format_display_name(device_id, cam_info)
    except Exception:
        return device_id


@tool
def query_alarm_stats(time_range: str = "today", alarm_type: str = "all") -> str:
    """查询告警统计数据（总数、按类型分布、按状态分布）

    Args:
        time_range: 时间范围 today=今日 week=本周 month=本月
        alarm_type: 告警类型筛选 leave_post/intrusion/illegal_parking/vehicle_congestion/all
    """
    from app.services.alarm_event_service import get_alarm_event_service
    svc = get_alarm_event_service()

    start, range_label = _parse_time_range(time_range)
    now = beijing_now()

    alarm_type_filter = None if alarm_type == "all" else alarm_type

    alarms, total = svc.get_alarms(
        alarm_type=alarm_type_filter,
        start_time=start,
        end_time=now,
        page=1,
        page_size=10000,
    )

    type_count = {}
    status_count = {"NEW": 0, "CONFIRMED": 0, "FALSE": 0, "CLOSED": 0}
    for a in alarms:
        type_count[a.alarm_type] = type_count.get(a.alarm_type, 0) + 1
        if a.alarm_status in status_count:
            status_count[a.alarm_status] += 1

    result = {
        "range": range_label,
        "total": total,
        "by_type": {ALARM_TYPE_NAMES.get(t, t): c for t, c in type_count.items()},
        "by_status": {ALARM_STATUS_NAMES.get(s, s): c for s, c in status_count.items()},
    }
    return json.dumps(result, ensure_ascii=False)


@tool
def list_alarms(
    time_range: str = "today",
    alarm_type: str = "all",
    alarm_status: str = "",
    limit: int = 10,
) -> str:
    """查询告警列表，返回最近的告警记录（含ID、类型、摄像头、状态、时间）

    Args:
        time_range: 时间范围 today/week/month
        alarm_type: 告警类型筛选 leave_post/intrusion/illegal_parking/vehicle_congestion/all
        alarm_status: 告警状态筛选 NEW=待处理 CONFIRMED=处理中 FALSE=误报 CLOSED=已关闭
        limit: 返回条数，默认10，最多20
    """
    from app.services.alarm_event_service import get_alarm_event_service
    svc = get_alarm_event_service()

    start, range_label = _parse_time_range(time_range)
    now = beijing_now()

    alarm_type_filter = None if alarm_type == "all" else alarm_type
    status_filter = alarm_status if alarm_status else None
    limit = min(limit, 20)

    alarms, total = svc.get_alarms(
        alarm_type=alarm_type_filter,
        alarm_status=status_filter,
        start_time=start,
        end_time=now,
        page=1,
        page_size=limit,
    )

    items = []
    for a in alarms:
        cam_name = _get_camera_display_name(a.device_id)
        event_time = ""
        if a.event_time:
            try:
                event_time = a.event_time.strftime("%m-%d %H:%M")
            except Exception:
                event_time = str(a.event_time)[:16]
        items.append({
            "alarm_id": a.alarm_id,
            "type": ALARM_TYPE_NAMES.get(a.alarm_type, a.alarm_type),
            "camera": cam_name,
            "status": ALARM_STATUS_NAMES.get(a.alarm_status, a.alarm_status),
            "level": ALARM_LEVEL_NAMES.get(a.alarm_level, "普通"),
            "time": event_time,
        })

    result = {"range": range_label, "total": total, "items": items}
    return json.dumps(result, ensure_ascii=False)


@tool
def get_alarm_detail(alarm_id: str, config: RunnableConfig) -> str:
    """查询单条告警的详细信息（含扩展信息和AI分析结果）

    Args:
        alarm_id: 告警ID（如 edge_xxx 或 ALM_xxx）
    """
    from app.services.alarm_event_service import get_alarm_event_service
    svc = get_alarm_event_service()

    detail = svc.get_alarm(alarm_id)
    if not detail:
        return json.dumps({"error": f"未找到告警: {alarm_id}"}, ensure_ascii=False)

    snapshot_url = detail.get("snapshot_url", "")

    result = {
        "alarm_id": detail.get("alarm_id"),
        "alarm_type": ALARM_TYPE_NAMES.get(detail.get("alarm_type", ""), detail.get("alarm_type", "")),
        "device_id": detail.get("device_id"),
        "alarm_status": ALARM_STATUS_NAMES.get(detail.get("alarm_status", ""), detail.get("alarm_status", "")),
        "alarm_level": ALARM_LEVEL_NAMES.get(detail.get("alarm_level"), "普通"),
        "event_time": str(detail.get("event_time", ""))[:19],
        "handle_status": detail.get("handle_status"),
        "handler": detail.get("handler"),
        "has_snapshot": bool(snapshot_url),
        "snapshot_url": snapshot_url,
    }

    # 摄像头名称
    result["camera_name"] = _get_camera_display_name(detail.get("device_id", ""))

    # LLM 分析
    analyses = detail.get("llm_analyses", [])
    if analyses:
        latest = analyses[-1]
        result["ai_analysis"] = latest.get("summary", "")

    return json.dumps(result, ensure_ascii=False)