from __future__ import annotations

from typing import Annotated

from fastapi import APIRouter, Depends, HTTPException, Query, status
from sqlalchemy.orm import Session

from app.api.deps import get_db
from app.schemas.common import ErrorResponse
from app.schemas.employee import EmployeeCreate, EmployeeMetaRead, EmployeeRead, EmployeeUpdate
from app.services.employee import EmployeeService

router = APIRouter()
DbSession = Annotated[Session, Depends(get_db)]


@router.get(
    "/meta",
    response_model=EmployeeMetaRead,
    summary="读取员工目录元数据",
    description="返回员工总数、状态汇总和可选角色列表，供员工管理页面初始化使用。",
)
def get_employee_meta(db: DbSession) -> EmployeeMetaRead:
    return EmployeeService(db).get_employee_meta()


@router.get(
    "",
    response_model=list[EmployeeRead],
    summary="查询员工列表",
    description="按状态和关键字筛选员工目录。",
)
def list_employees(
    db: DbSession,
    status_filter: Annotated[
        str | None,
        Query(alias="status", description="员工状态筛选值。"),
    ] = None,
    keyword: Annotated[
        str | None,
        Query(description="姓名、工号、邮箱等关键字模糊查询。"),
    ] = None,
) -> list[EmployeeRead]:
    return EmployeeService(db).list_employees(status=status_filter, keyword=keyword)


@router.post(
    "",
    response_model=EmployeeRead,
    status_code=status.HTTP_201_CREATED,
    summary="创建员工",
    description="创建新的员工目录记录，并初始化基础角色与组织归属。",
    responses={
        status.HTTP_400_BAD_REQUEST: {
            "model": ErrorResponse,
            "description": "员工数据校验失败。",
        }
    },
)
def create_employee(payload: EmployeeCreate, db: DbSession) -> EmployeeRead:
    try:
        return EmployeeService(db).create_employee(payload)
    except ValueError as exc:
        raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail=str(exc)) from exc


@router.get(
    "/{employee_id}",
    response_model=EmployeeRead,
    summary="读取员工详情",
    description="根据员工主键读取员工完整档案信息。",
    responses={
        status.HTTP_404_NOT_FOUND: {
            "model": ErrorResponse,
            "description": "员工不存在。",
        }
    },
)
def get_employee(employee_id: str, db: DbSession) -> EmployeeRead:
    employee = EmployeeService(db).get_employee(employee_id)
    if employee is None:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Employee not found")
    return employee


@router.patch(
    "/{employee_id}",
    response_model=EmployeeRead,
    summary="更新员工",
    description="更新员工基础信息、角色、密码等可维护字段。",
    responses={
        status.HTTP_400_BAD_REQUEST: {
            "model": ErrorResponse,
            "description": "请求字段不合法。",
        },
        status.HTTP_404_NOT_FOUND: {
            "model": ErrorResponse,
            "description": "员工不存在。",
        },
    },
)
def update_employee(employee_id: str, payload: EmployeeUpdate, db: DbSession) -> EmployeeRead:
    try:
        return EmployeeService(db).update_employee(employee_id, payload)
    except LookupError as exc:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail=str(exc)) from exc
    except ValueError as exc:
        raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail=str(exc)) from exc


@router.post(
    "/{employee_id}/disable",
    response_model=EmployeeRead,
    summary="停用员工",
    description="将员工状态切换为停用，阻止其继续登录系统。",
    responses={
        status.HTTP_404_NOT_FOUND: {
            "model": ErrorResponse,
            "description": "员工不存在。",
        }
    },
)
def disable_employee(employee_id: str, db: DbSession) -> EmployeeRead:
    try:
        return EmployeeService(db).disable_employee(employee_id)
    except LookupError as exc:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail=str(exc)) from exc


@router.post(
    "/{employee_id}/enable",
    response_model=EmployeeRead,
    summary="启用员工",
    description="将停用员工恢复为在职状态，使其可以重新登录系统。",
    responses={
        status.HTTP_404_NOT_FOUND: {
            "model": ErrorResponse,
            "description": "员工不存在。",
        }
    },
)
def enable_employee(employee_id: str, db: DbSession) -> EmployeeRead:
    try:
        return EmployeeService(db).enable_employee(employee_id)
    except LookupError as exc:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail=str(exc)) from exc