from typing import Optional
from pydantic import model_validator
from sqlmodel import Field
from typing_extensions import Self

from .person import Person
from utils.enums.major import Major


class Student(Person, table=True):
    """
    Represents a Student, inheriting from Person, with an additional major field.

    Attributes:
        major (str): The major that the student is pursuing.

    Methods:
        set_id() -> Self: An SQLModel model validator that automatically sets the student's ID with a "STU" prefix through handle_id method in the Person class.
    """

    major: str = Field(default=Major.COMPUTER_SCIENCE)

    @model_validator(mode='after')
    def set_id(self) -> Self:
        self.handle_id(prefix="STU")

        return self

    def __str__(self) -> str:
        """
        Returns a string representation of the student.

        Returns:
            str: A description of the student including their name, ID number, and major.
        """

        return f"Student(name: {self.name}, id: {self.id}, major: {self.major})"