# =============================================================================
# 企微IT智能服务台 — 员工 API
# =============================================================================
# 说明：提供员工相关的管理接口
# 接口列表：
#   PUT /api/employees/{employee_id}/it-level — 更新员工IT技能等级
#   POST /api/employees/{employee_id}/avatar/refresh — 手动刷新员工头像
# =============================================================================

from typing import Optional

from fastapi import APIRouter, Depends, HTTPException
from pydantic import BaseModel, Field, field_validator
from sqlalchemy import select
from sqlalchemy.ext.asyncio import AsyncSession
import redis.asyncio as aioredis

from app.utils.response import success_response
from app.schemas.employee import VALID_IT_LEVELS, VALID_LEVEL_SOURCES
from app.database import get_db
from app.core.config import settings
from app.models.employee import Employee
from app.dependencies import dep_redis

# 导入日志
import logging
logger = logging.getLogger(__name__)

# 创建路由器
router = APIRouter(prefix="/employees", tags=["员工管理"])


# --------------------------------------------------------------------------
# 请求 Schema
# --------------------------------------------------------------------------

class ItLevelUpdateRequest(BaseModel):
    """IT技能等级更新请求 Schema。"""

    it_level: str = Field(..., description="IT技能等级: bronze/silver/gold/platinum/diamond/star/king")
    source: str = Field(default="manual", description="等级来源: system/manual/assessment")

    @field_validator("it_level")
    @classmethod
    def validate_it_level(cls, v: str) -> str:
        """校验IT等级值是否合法。"""
        if v not in VALID_IT_LEVELS:
            raise ValueError(f"无效的IT等级: {v}，合法值为: {VALID_IT_LEVELS}")
        return v

    @field_validator("source")
    @classmethod
    def validate_source(cls, v: str) -> str:
        """校验等级来源值是否合法。"""
        if v not in VALID_LEVEL_SOURCES:
            raise ValueError(f"无效的等级来源: {v}，合法值为: {VALID_LEVEL_SOURCES}")
        return v


class ItLevelUpdateResponse(BaseModel):
    """IT技能等级更新响应 Schema。"""

    employee_id: str
    it_level: str
    it_level_source: str
    message: str


# --------------------------------------------------------------------------
# Mock 员工数据存储（IT 等级映射）
# --------------------------------------------------------------------------

# 简单的内存存储，key 为 employee_id，value 为 it_level
MOCK_EMPLOYEE_IT_LEVELS: dict = {
    "emp-001": "silver",
    "emp-002": "gold",
    "emp-003": "bronze",
    "emp-004": "platinum",
    "emp-005": "diamond",
    "emp-006": "silver",
    "emp-007": "star",
    "emp-008": "king",
}


# --------------------------------------------------------------------------
# API 接口
# --------------------------------------------------------------------------

@router.put("/{employee_id}/it-level")
async def update_employee_it_level(
    employee_id: str,
    request: ItLevelUpdateRequest,
):
    """更新员工IT技能等级。

    坐席可以手动调整员工的IT技能等级，等级来源标记为 manual。
    更新后等级立即生效，并记录来源以便追溯。

    Args:
        employee_id: 员工ID
        request: 等级更新请求

    Returns:
        更新结果
    """
    # 更新内存中的等级
    old_level = MOCK_EMPLOYEE_IT_LEVELS.get(employee_id, "silver")
    MOCK_EMPLOYEE_IT_LEVELS[employee_id] = request.it_level

    # 构造等级名称映射
    level_names = {
        "bronze": "青铜",
        "silver": "白银",
        "gold": "黄金",
        "platinum": "铂金",
        "diamond": "钻石",
        "star": "星耀",
        "king": "王者",
    }

    return success_response(data=ItLevelUpdateResponse(
        employee_id=employee_id,
        it_level=request.it_level,
        it_level_source=request.source,
        message=f"IT等级已从 {level_names.get(old_level, old_level)} 调整为 {level_names.get(request.it_level, request.it_level)}",
    ).model_dump())


# --------------------------------------------------------------------------
# 头像刷新 API
# --------------------------------------------------------------------------

class AvatarRefreshResponse(BaseModel):
    """头像刷新响应 Schema。"""

    employee_id: str
    avatar: str
    message: str


async def get_redis() -> aioredis.Redis:
    """获取Redis客户端依赖"""
    redis = await dep_redis()
    if redis is None:
        raise HTTPException(status_code=500, detail="Redis连接不可用")
    return redis


@router.post("/{employee_id}/avatar/refresh", response_model=dict)
async def refresh_employee_avatar(
    employee_id: str,
    db: AsyncSession = Depends(get_db),
    redis: aioredis.Redis = Depends(get_redis),
):
    """手动刷新员工头像。

    调用企微通讯录API获取最新头像URL，更新数据库并刷新Redis缓存。
    支持手动触发头像更新，适用于头像URL过期或需要立即更新的场景。

    Args:
        employee_id: 员工ID

    Returns:
        更新后的头像URL
    """
    from datetime import datetime
    from app.services.session_service import SessionService

    # 1. 查找员工记录
    result = await db.execute(
        select(Employee).where(
            Employee.employee_id == employee_id,
            Employee.corp_id == settings.wecom_corp_id
        )
    )
    employee = result.scalars().first()

    if not employee:
        raise HTTPException(status_code=404, detail=f"员工不存在: {employee_id}")

    # 2. 使用 SessionService 从企微API获取最新头像
    session_service = SessionService(db, redis_client=redis)
    new_avatar = ""

    try:
        # 调用企微API获取最新头像
        from app.services.wecom_service import WeComService
        wecom_service = WeComService()
        user_info = await wecom_service.get_user_info(employee_id)
        new_avatar = user_info.get("avatar", "")

        logger.info(f"企微API返回头像: employee_id={employee_id}, avatar={'有值(' + str(len(new_avatar)) + '字符)' if new_avatar else '空'}")

        # 3. 更新数据库
        employee.avatar = new_avatar
        employee.avatar_updated_at = datetime.utcnow()
        await db.commit()

        # 4. 刷新Redis缓存
        cache_key = f"employee:avatar:{employee_id}"
        if redis:
            try:
                if new_avatar:
                    await redis.setex(cache_key, SessionService.AVATAR_CACHE_TTL, new_avatar)
                else:
                    # 如果头像为空，删除缓存
                    await redis.delete(cache_key)
            except Exception as e:
                logger.warning(f"刷新Redis头像缓存失败: employee_id={employee_id}, error={e}")

        return success_response(data=AvatarRefreshResponse(
            employee_id=employee_id,
            avatar=new_avatar,
            message="头像刷新成功" if new_avatar else "企微API未返回头像，已使用原头像",
        ).model_dump())

    except Exception as e:
        logger.error(f"刷新头像失败: employee_id={employee_id}, error={e}")
        # 返回原头像，不阻塞流程
        return success_response(data=AvatarRefreshResponse(
            employee_id=employee_id,
            avatar=employee.avatar,
            message=f"头像刷新失败，使用原头像: {str(e)}",
        ).model_dump())