from datetime import datetime
from typing import Optional

from sqlmodel import JSON, Field, SQLModel


class Plan(SQLModel, table=True):
    id: Optional[int] = Field(default=None, primary_key=True)
    user_id: int = Field(foreign_key="user.id")
    goal: str = Field(index=True)  # e.g., "lose weight", "gain muscle"
    content: str = Field(description="The full plan content in markdown or text")
    structured_content: dict = Field(default={}, sa_type=JSON)  # For UI rendering
    created_at: datetime = Field(default_factory=datetime.utcnow)