from sqlmodel import SQLModel, Field
from datetime import datetime, date
from typing import Optional


class Task(SQLModel, table=True):
    """Task entity representing a to-do item."""

    __tablename__ = "tasks"

    id: Optional[int] = Field(default=None, primary_key=True)
    user_id: int = Field(foreign_key="users.id", nullable=False, index=True)
    title: str = Field(max_length=200, nullable=False)
    description: Optional[str] = Field(default=None, max_length=1000)
    completed: bool = Field(default=False, nullable=False, index=True)
    due_date: Optional[date] = Field(default=None)
    priority: str = Field(default="medium", max_length=20)
    created_at: datetime = Field(default_factory=datetime.utcnow, nullable=False, index=True)
    updated_at: datetime = Field(default_factory=datetime.utcnow, nullable=False)