from sqlalchemy.exc import SQLAlchemyError
from fastapi import HTTPException
from model.teaModel import Teacher

def get_teachers_limit_dao(p,n,db):
    if p == 0 and n == 0:
        r = db.query(Teacher).all()
    else:
        if p < 1:
            p = 1
        r = db.query(Teacher).offset((p-1)*n).limit(n).all()
    return [ {'id':i.id,'t_name':i.t_name,'t_sex':i.t_sex,'t_age':i.t_age}  for i in r]


def get_teachers_name_dao(name,db):
    try:
        r = db.query(Teacher).filter(Teacher.t_name==name).all()
    except SQLAlchemyError as e:
        db.rollback()
        raise HTTPException(status_code=500, detail=f'查询失败:{str(e)}')
    else:
        return [ {'id':i.id,'t_name':i.t_name,'t_sex':i.t_sex,'t_age':i.t_age}  for i in r]

def insert_teachers_dao(req,db):
    try:
        exist = db.query(Teacher).filter(Teacher.t_phone==req['t_phone']).first()
        if exist:
            raise HTTPException(status_code=400,detail='该手机号码已存在,不可重复使用')
        t = Teacher(**req)
        db.add(t)
    except SQLAlchemyError as e:
        db.rollback()
        raise HTTPException(status_code=500,detail=f'添加失败:{str(e)}')
    else:
        db.commit()
        return True,'添加成功'

def update_teachers_dao(req,db,t_id):
    try:
        db.query(Teacher).filter(Teacher.id == t_id).update(req)
    except SQLAlchemyError as e:
        db.rollback()
        raise HTTPException(status_code=500,detail=f'更新失败:{str(e)}')
    else:
        db.commit()
        return True,'更新成功'

def delete_teachers_dao(t_id,db):
    try:
        r = db.query(Teacher).filter(Teacher.id == t_id).all()
        if not r:
            raise HTTPException(status_code=404,detail='记录不存在')
        for i in r:
            if i.is_delete == 0:
                db.query(Teacher).filter(Teacher.id == i.id).update({'is_delete':True})
            else:
                raise HTTPException(status_code=400,detail='该记录已删除，不可重复删除')
    except SQLAlchemyError as e:
        db.rollback()
        raise HTTPException(status_code=500,detail=f'删除失败：{str(e)}')
    else:
        db.commit()
        return True,'删除成功'