# =============================================================================
# 企微IT智能服务台 — 阶段5 自动化 员工→终端映射
# =============================================================================
# 说明：把员工（企微 UserID）解析为终端信息，供 virus_dispose 等场景使用。
#   主源：联软（支持 strusername 直接映射）
#   兜底：北森 EHR（仅给资产/部门 hint，无法提供火绒 client_id）
# 结果缓存在 auto_mapping_cache（TTL），降低外部系统压力。
# =============================================================================

from __future__ import annotations

import logging
from datetime import datetime, timedelta, timezone
from typing import Any, Dict, Optional

from sqlalchemy import select

from app.constants import MAPPING_SOURCE_PRIORITY
from app.integrations.factory import build_ehr_client, build_lianruan_client
from app.models.automation import MappingCache

logger = logging.getLogger(__name__)

# 映射缓存 TTL（秒）：联软数据 10 分钟内复用以降低外部压力
MAPPING_CACHE_TTL_SECONDS = 600


class MappingResolver:
    """员工→终端映射解析器。"""

    def __init__(self, db: Any = None, audit: Any = None):
        self.db = db
        self.audit = audit

    async def resolve(self, employee_id: str, scenario_key: str = "") -> Dict[str, Any]:
        """解析员工→终端映射。

        Returns:
            Dict: {
                "employee_id", "source"(lianruan/ehr/None),
                "terminals": [...], "client_ids": [...]（仅联软可给）
            }
        """
        # 1. 查缓存（联软结果优先复用）
        cached = await self._load_cache(employee_id)
        if cached is not None:
            logger.info(f"命中映射缓存 employee={employee_id}, source={cached.get('source')}")
            return cached

        terminals: list = []
        source: Optional[str] = None
        client_ids: list = []

        # 2. 主源：联软（按员工账号直接映射）
        lianruan = None
        try:
            lianruan = await build_lianruan_client(self.db, audit=self.audit)
        except Exception as e:  # noqa: BLE001
            logger.warning(f"构建联软客户端失败: {e}")

        if lianruan is not None:
            try:
                data = await lianruan.query_dev_by_params(strusername=employee_id)
                items = data.get("items", []) if isinstance(data, dict) else []
                if items:
                    terminals = [
                        {
                            "strdevname": getattr(t, "strdevname", ""),
                            "strdevip": getattr(t, "strdevip", ""),
                            "strusername": getattr(t, "strusername", ""),
                            "strdeptname": getattr(t, "strdeptname", ""),
                        }
                        for t in items
                    ]
                    # 火绒隔离以「终端标识」为目标；联软返回的是 hostname/ip，
                    # 真实环境需按 hostname 做跨系统资产对齐（见交付说明假设）。
                    client_ids = [
                        (t.get("strdevname") or t.get("strdevip"))
                        for t in terminals
                        if (t.get("strdevname") or t.get("strdevip"))
                    ]
                    source = "lianruan"
            except Exception as e:  # noqa: BLE001
                logger.warning(f"联软映射失败 employee={employee_id}: {e}")

        # 3. 兜底：北森 EHR（仅 hint，无火绒 client_id）
        if not source:
            ehr = None
            try:
                ehr = await build_ehr_client(audit=self.audit)
            except Exception as e:  # noqa: BLE001
                logger.warning(f"构建 EHR 客户端失败: {e}")
            if ehr is not None:
                try:
                    hint = await ehr.get_terminal_by_employee(employee_id)
                    if hint:
                        terminals = [hint]
                        source = "ehr"
                except Exception as e:  # noqa: BLE001
                    logger.warning(f"EHR 映射兜底失败 employee={employee_id}: {e}")

        result: Dict[str, Any] = {
            "employee_id": employee_id,
            "source": source,
            "terminals": terminals,
            "client_ids": client_ids,
        }

        # 4. 写缓存（仅联软结果值得缓存，EHR hint 不长期缓存）
        if source == "lianruan":
            await self._save_cache(employee_id, result)

        return result

    async def _load_cache(self, employee_id: str) -> Optional[Dict[str, Any]]:
        """读取未过期的映射缓存。"""
        if self.db is None:
            return None
        try:
            stmt = select(MappingCache).where(MappingCache.employee_id == employee_id)
            row = (await self.db.execute(stmt)).scalar_one_or_none()
            if row is None:
                return None
            if row.expires_at is not None and row.expires_at < datetime.now(timezone.utc):
                return None
            return row.mapped_data
        except Exception as e:  # noqa: BLE001
            logger.debug(f"读映射缓存失败: {e}")
            return None

    async def _save_cache(self, employee_id: str, data: Dict[str, Any]) -> None:
        """写入映射缓存。"""
        if self.db is None:
            return
        try:
            stmt = select(MappingCache).where(MappingCache.employee_id == employee_id)
            row = (await self.db.execute(stmt)).scalar_one_or_none()
            now = datetime.now(timezone.utc)
            if row is None:
                row = MappingCache(
                    employee_id=employee_id,
                    source=data.get("source", "lianruan"),
                    mapped_data=data,
                    expires_at=now + timedelta(seconds=MAPPING_CACHE_TTL_SECONDS),
                )
                self.db.add(row)
            else:
                row.mapped_data = data
                row.source = data.get("source", row.source)
                row.expires_at = now + timedelta(seconds=MAPPING_CACHE_TTL_SECONDS)
            await self.db.flush()
        except Exception as e:  # noqa: BLE001
            logger.warning(f"写映射缓存失败: {e}")