from fastapi import APIRouter, Depends, HTTPException, Query, Path
from sqlalchemy.orm import Session
from typing import List

from database import get_db
from dao.teacher_dao import TeacherDao
from scheme.teacher_scheme import TeacherAdd,TeacherUpdate, TeacherResponse

router = APIRouter()

#  查询所有教师（支持分页）
@router.get("/get_all_teachers", response_model=List[TeacherResponse])
async def get_all_teachers(
    skip: int = Query(0, ge=0, description="跳过的记录数"),
    limit: int = Query(100, ge=1, le=200, description="返回的最大记录数"),
    db: Session = Depends(get_db)   # 依赖注入获得数据库会话
):

    teachers = TeacherDao.get_all(db, skip=skip, limit=limit)
    return teachers   # FastAPI 自动根据 response_model 转换为 JSON

#  根据 ID 和 name 查询单个教师
@router.get("/get_teacher/{teacher_id_name}", response_model=TeacherResponse)
async def get_teacher(
    teacher_id_name: str = Path(..., description="要查询教师的id或姓名"),
    db: Session = Depends(get_db)
):
    teacher = TeacherDao.get_by_id(db, teacher_id_name) or TeacherDao.get_by_name(db, teacher_id_name)
    if not teacher:
        raise HTTPException(status_code=404, detail="用户不存在")
    return teacher

#  根据 ID  查询教师带教的班级的信息
@router.get("/get_class_info/{teacher_id}")
async def get_class_info(
    teacher_id: str = Path(..., description="要查询教师的id"),
    db: Session = Depends(get_db)
):
    teacher = TeacherDao.get_clss_info(db, teacher_id)
    if not teacher:
        raise HTTPException(status_code=404, detail="用户不存在")
    return teacher

# 添加教师信息
@router.post("/add_teacher", response_model=TeacherResponse)
async def add_teacher(
    teacher_data: TeacherAdd,
    db: Session = Depends(get_db)
):
    # 调用 TeacherDao 创建教师信息
    new_teacher = TeacherDao.add(db, teacher_data)
    return new_teacher

#  根据教师id更新教师信息
@router.put("/update_teacher/{teacher_id}", response_model=TeacherResponse)
async def update_teacher(
    teacher_id: str,
    teacher_data: TeacherUpdate,
    db: Session = Depends(get_db)
):
    # 检查传入的id教师是否存在
    existing = TeacherDao.get_by_id(db, teacher_id)
    if not existing:
        raise HTTPException(status_code=404, detail="用户不存在")

    # 执行更新
    updated = TeacherDao.update(db, teacher_id, teacher_data)
    return updated

# 删除教师
@router.delete("/delete_teacher/{teacher_id}")
async def delete_teacher(
    teacher_id: str,
    db: Session = Depends(get_db)
):

    success = TeacherDao.delete(db, teacher_id)
    if not success:
        raise HTTPException(status_code=404, detail="用户不存在")

    return "该教师已删除"