from fastapi import HTTPException
from pydantic import BaseModel, Field,field_validator, model_validator
from datetime import date
from typing import Optional

class EmploymentRequest(BaseModel):
    stu_id: int=Field(ge=1)
    email: str|None
    employment_opening_date:date
    offer_issuance_date:date
    company_name:str
    company_address:str|None
    salary:float

    @field_validator('stu_id')
    @classmethod
    def check_stu_id(cls,v):
        if v <= 0:
            raise ValueError('输入有误，学生ID必须大于0')
        return v

    @model_validator(mode='after')
    def check_date(self):
        if self.employment_opening_date > self.offer_issuance_date:
            raise ValueError('offer下发日期不能早于就业开放日期')
        return self

class EmploymentResponse(BaseModel):
    code:int = 200
    detail:str = 'OK'
    emp_id:int
    stu_id: int
    stu_name:Optional[str] = None
    class_id:int
    email: str | None
    employment_opening_date: date
    offer_issuance_date: date
    company_name: str
    company_address: str | None
    salary: float