# dao/score_dao.py
from sqlalchemy.orm import Session
from model.score import Score
from model.student import Student


 # 查
# 查一个学生所有成绩

def get_score(db: Session, student_id: int):
    return db.query(Score).filter(
        Score.student_id == student_id,
        Score.is_deleted == 0,
    ).order_by(Score.exam_seq.asc()).all()



# 查某学生的某次成绩
def get_one_score(db: Session, student_id: int, exam_seq: int):

    return db.query(Score).filter(
        Score.student_id == student_id,
        Score.exam_seq == exam_seq,
        Score.is_deleted == 0,
    ).first()



# 查不及格的
def get_warning(db: Session):
    return db.query(Score).filter(
        Score.is_warning == 1,
        Score.is_deleted == 0,
    ).all()






# 录


# 录信息
def add_score(db: Session, student_id: int, exam_seq: int, score: float):

    stu = db.query(Student).filter(Student.id == student_id).first()
    if not stu:
        return None, "学生不存在"


    exists = get_one_score(db, student_id, exam_seq)
    if exists:
        return None, "该学生这次成绩已录过"



    new_score = Score(
        student_id=student_id,
        exam_seq=exam_seq,
        score=score,
        is_warning=1 if score < 60 else 0,
        is_deleted=0,
    )
    db.add(new_score)
    db.commit()
    db.refresh(new_score)
    return new_score, None





#  改

  # 改成绩

def update_score(db: Session, student_id: int, exam_seq: int, new_score: float):


    obj = get_one_score(db, student_id, exam_seq)
    if not obj:
        return None, "成绩不存在或已删除"

    obj.score = new_score

    # 如果不及格 预警重置
    obj.is_warning = 1 if new_score < 60 else 0

    db.commit()
    db.refresh(obj)
    return obj, None





# 逻辑删除


def delete_score(db: Session, student_id: int, exam_seq: int):
  # 把删除的学生0改成1

    obj = get_one_score(db, student_id, exam_seq)

    if not obj:
        return None, "成绩不存在或已删除"


  # 0 → 1
    obj.is_deleted = 1
    db.commit()
    return obj, None