"""
通知调度服务

告警创建后的异步处理流水线：
1. VLM 复核截图 → 写入 alarm_llm_analysis
2. 查表获取通知人员 (camera → area → person)
3. 推送企微互动卡片

全程异步执行，不阻塞告警接收主流程。
VLM 或企微不可用时自动降级，不影响系统运行。
"""

from datetime import datetime
from typing import Dict, List

from app.models import (
    get_session,
    AlarmEvent, AlarmLlmAnalysis,
    CameraAreaBinding, AreaPersonBinding, NotifyArea,
)
from app.config import settings
from app.services.vlm_service import get_vlm_service
from app.services.wechat_service import get_wechat_service
from app.utils.logger import logger


async def process_alarm_notification(alarm_data: Dict):
    """
    告警通知处理流水线（异步，fire-and-forget）

    Args:
        alarm_data: 告警字典，包含 alarm_id, alarm_type, device_id,
                    snapshot_url, alarm_level, event_time 等字段
    """
    alarm_id = alarm_data.get("alarm_id", "")
    alarm_type = alarm_data.get("alarm_type", "")
    device_id = alarm_data.get("device_id", "")
    snapshot_url = alarm_data.get("snapshot_url", "")
    alarm_level = alarm_data.get("alarm_level", 2)
    event_time = alarm_data.get("event_time", "")

    logger.info(f"开始处理告警通知: {alarm_id}")

    try:
        # ========== 1. VLM 复核 ==========
        vlm_service = get_vlm_service()
        camera_name = alarm_data.get("camera_name", device_id)
        roi_name = alarm_data.get("scene_id", "")

        vlm_result = await vlm_service.verify_alarm(
            snapshot_url=snapshot_url,
            alarm_type=alarm_type,
            camera_name=camera_name,
            roi_name=roi_name,
        )

        # 写入 alarm_llm_analysis 表（复用已有表）
        _save_vlm_result(alarm_id, vlm_result)

        # VLM 判定为误报 → 更新告警状态，不通知
        if not vlm_result.get("confirmed", True):
            _mark_false_alarm(alarm_id)
            logger.info(f"VLM 判定误报，跳过通知: {alarm_id}")
            return

        # ========== 2. 查表获取通知人员 ==========
        description = vlm_result.get("description", "")
        area_name, persons = _get_notify_persons(device_id, alarm_level)

        # 演示模式：数据库无人员时，使用配置的测试 userid
        if not persons and settings.wechat.test_uids:
            test_uids = [uid.strip() for uid in settings.wechat.test_uids.split(",") if uid.strip()]
            if test_uids:
                persons = [{"person_name": "测试用户", "wechat_uid": uid, "role": "TEST"} for uid in test_uids]
                area_name = "演示区域"
                logger.info(f"演示模式: 使用测试用户 {test_uids}")

        if not persons:
            logger.warning(f"未找到通知人员: camera={device_id}, 跳过企微推送")
            return

        # ========== 3. 推送企微通知 ==========
        wechat_service = get_wechat_service()
        if not wechat_service.enabled:
            logger.info("企微未启用，跳过推送")
            return

        user_ids = [p["wechat_uid"] for p in persons]
        event_time_str = (
            event_time.strftime("%Y-%m-%d %H:%M:%S")
            if isinstance(event_time, datetime) else str(event_time or "")
        )

        await wechat_service.send_alarm_card(
            user_ids=user_ids,
            alarm_id=alarm_id,
            alarm_type=alarm_type,
            area_name=area_name,
            camera_name=camera_name,
            description=description,
            snapshot_url=snapshot_url,
            event_time=event_time_str,
            alarm_level=alarm_level,
            service_base_url=settings.wechat.service_base_url or f"http://{settings.app.host}:{settings.app.port}",
        )

        logger.info(f"告警通知完成: {alarm_id} → {len(persons)} 人")

    except Exception as e:
        logger.error(f"告警通知处理失败: {alarm_id}, error={e}", exc_info=True)


def _save_vlm_result(alarm_id: str, vlm_result: Dict):
    """将 VLM 复核结果写入 alarm_llm_analysis 表"""
    db = get_session()
    try:
        analysis = AlarmLlmAnalysis(
            alarm_id=alarm_id,
            llm_model="qwen3-vl-flash",
            analysis_type="REVIEW",
            summary=vlm_result.get("description", ""),
            is_false_alarm=not vlm_result.get("confirmed", True),
            confidence_score=None if vlm_result.get("skipped") else 0.9,
            suggestion="VLM跳过" if vlm_result.get("skipped") else None,
        )
        db.add(analysis)
        db.commit()
    except Exception as e:
        db.rollback()
        logger.error(f"保存 VLM 结果失败: {e}")
    finally:
        db.close()


def _mark_false_alarm(alarm_id: str):
    """将告警标记为误报"""
    db = get_session()
    try:
        alarm = db.query(AlarmEvent).filter(AlarmEvent.alarm_id == alarm_id).first()
        if alarm:
            alarm.alarm_status = "FALSE"
            alarm.handle_status = "DONE"
            alarm.handle_remark = "VLM复核判定误报"
            alarm.handled_at = datetime.now()
            db.commit()
            logger.info(f"告警已标记误报: {alarm_id}")
    except Exception as e:
        db.rollback()
        logger.error(f"标记误报失败: {e}")
    finally:
        db.close()


def _get_notify_persons(camera_id: str, alarm_level: int) -> tuple:
    """
    根据摄像头ID查找通知人员

    Returns:
        (area_name, [{"person_name": ..., "wechat_uid": ..., "role": ...}])
    """
    db = get_session()
    try:
        # camera → area
        binding = db.query(CameraAreaBinding).filter(
            CameraAreaBinding.camera_id == camera_id
        ).first()

        if not binding:
            return ("未知区域", [])

        # area info
        area = db.query(NotifyArea).filter(
            NotifyArea.area_id == binding.area_id,
            NotifyArea.enabled == 1,
        ).first()

        area_name = area.area_name if area else "未知区域"

        # area → persons
        persons = db.query(AreaPersonBinding).filter(
            AreaPersonBinding.area_id == binding.area_id,
            AreaPersonBinding.enabled == 1,
            AreaPersonBinding.notify_level <= alarm_level,
        ).all()

        result = [
            {
                "person_name": p.person_name,
                "wechat_uid": p.wechat_uid,
                "role": p.role,
            }
            for p in persons
        ]

        return (area_name, result)

    except Exception as e:
        logger.error(f"查询通知人员失败: {e}")
        return ("未知区域", [])
    finally:
        db.close()