from fastapi import APIRouter,Depends,HTTPException,Path,Form
from util.database import get_db
from model.all_model import Student_Model
from dao.grade_dao import *
from schema.grade_schema import *
from fastapi import APIRouter, Depends, HTTPException, Body

gradeAPI = APIRouter(tags=['学生考核成绩'])

@gradeAPI.get("/grade/{stu_id}",response_model=list[GradeResponse],summary="根据学生id查询成绩")
def get_grade(stu_id: int,db=Depends(get_db)):
    try:
        res=get_grade_dao(stu_id,db)
        return res
    except Exception as e:
        raise HTTPException(status_code=500,detail=f'数据库查询异常:{str(e)}')

@gradeAPI.post('/grade',response_model=GradeResponse,summary='添加学生成绩')
def post_grade(o:GradeRequest,db=Depends(get_db)):
    d=o.model_dump()
    r=add_grade_dao(g=d,db=db)
    if not r:
        raise HTTPException(status_code=400, detail='学生不存在')
    return o

@gradeAPI.put("/grade/{score_id}", summary="成绩修改")
def put_grade(
    score_id: int,
    exam_order: int | None = Body(default=None),
    score: float | None = Body(default=None),
    db=Depends(get_db)
):
    # 1. 查询这条成绩记录是否存在(未删除)
    old_obj = get_score_by_id_dao(score_id=score_id, db=db)
    if not old_obj:
        raise HTTPException(status_code=404, detail="成绩记录不存在(已删除)")

    # 2. 组装需要更新的字典，只把不为None的字段放进去
    update_data = {}
    if exam_order is not None:
        update_data["exam_order"] = exam_order
    if score is not None:
        update_data["score"] = score

    # 没有传入任何要修改的字段
    if not update_data:
        raise HTTPException(status_code=400, detail="请传入需要修改的字段：exam_order 或 score")

    # 3. 如果要修改考核序次，做重复校验：同一个学生不能重复的exam_order
    if "exam_order" in update_data:
        exist_obj = get_score_by_stu_exam_order_dao(
            stu_id=old_obj.stu_id,
            exam_order=update_data["exam_order"],
            db=db
        )
        # 查询到别的记录占用该学生该考核序次
        if exist_obj and exist_obj.score_id != score_id:
            raise HTTPException(status_code=409, detail="修改后的考核序次，该学生已有成绩！")

    # 4.执行数据库更新
    try:
        rows = update_grade_dao(score_id=score_id, update_data=update_data, db=db)
    except Exception:
        raise HTTPException(status_code=409, detail="数据冲突，重复数据")

    if rows == 0:
        return {"code": 200, "totals": rows, "detail": "数据未发生变化"}

    return {"code": 200, "totals": rows, "detail": "更新成功"}

@gradeAPI.delete('/{score_id}',summary='删除成绩')
def delete_grade(score_id:int,db=Depends(get_db)):
    r = delete_grade_dao(stu_id=score_id,db=db)
    if not r:
        raise HTTPException(status_code=404,detail='删除失败')
    return {'code':200,'totals':r,'detail':'删除成功'}