"""
基础模型定义
============
"""

import uuid
from datetime import UTC, datetime

from sqlalchemy import DateTime
from sqlalchemy.dialects.postgresql import UUID
from sqlalchemy.orm import Mapped, mapped_column

from app.db.session import Base


class BaseModel(Base):
    """
    基础模型 - 所有模型继承此类

    提供：
    - UUID 主键（自动生成）
    - 创建时间
    - 更新时间
    """

    __abstract__ = True

    id: Mapped[str] = mapped_column(
        UUID(as_uuid=False),
        primary_key=True,
        default=lambda: str(uuid.uuid4()),
    )

    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        default=lambda: datetime.now(UTC),
        nullable=False,
    )

    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        default=lambda: datetime.now(UTC),
        onupdate=lambda: datetime.now(UTC),
        nullable=False,
    )

    def to_dict(self) -> dict:
        """转换为字典（用于序列化）"""
        return {column.name: getattr(self, column.name) for column in self.__table__.columns}