from sqlalchemy import create_engine
from database import Base, engine

class Teacher(Base):
    __tablename__ = 'wl_teacher'
    t_id = Column(Integer, primary_key=True, autoincrement=True)
    t_no = Column(String(20), unique=True, nullable=False)
    t_name = Column(String(50), nullable=False)
    t_phone = Column(String(20), unique=True, nullable=True)
    t_email = Column(String(20), unique=False)
    class_id = Column(Integer, ForeignKey("wl_class.id"), nullable=False)
    role = Column(String(50), nullable=False)
    is_deleted = Column(Integer, default=0)

    def generate_teacher_no(db: Session, hire_date: date):
        """
        工号规则：T + 入职日期(YYYYMMDD) + 3位当天序号
        例如：T20250912001、T20250912002
        """
        date_str = hire_date.strftime("%Y%m%d")
        prefix = f"T{date_str}"