from pydantic import BaseModel
from typing import Optional
from datetime import datetime

class GoalBase(BaseModel):
    title: str
    description: Optional[str] = ""
    target_date: Optional[datetime] = None

class GoalCreate(GoalBase):
    pass

class GoalUpdate(GoalBase):
    title: Optional[str] = None

class GoalInDB(GoalBase):
    id: str
    user_id: str
    created_at: datetime
    updated_at: datetime

class GoalList(BaseModel):
    goals: list[GoalInDB]