"""基础模型定义"""
from datetime import datetime
from typing import Optional

from sqlalchemy import Column, DateTime, Integer, Boolean, func
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import Mapped, mapped_column

# 创建基础模型类
Base = declarative_base()


class BaseModel(Base):
    """
    基础模型类，所有模型都应继承此类
    包含通用字段：id, created_at, updated_at
    时区：使用北京时间（Asia/Shanghai, UTC+8）
    """

    __abstract__ = True
    __allow_unmapped__ = True  # SQLAlchemy 2.0 兼容性

    id: Mapped[int] = mapped_column(Integer, primary_key=True, index=True)
    created_at: Mapped[datetime] = mapped_column(
        DateTime, server_default=func.now(), nullable=False, comment="创建时间（北京时间）"
    )
    updated_at: Mapped[datetime] = mapped_column(
        DateTime, server_default=func.now(), onupdate=func.now(), nullable=False, comment="更新时间（北京时间）"
    )


class SoftDeleteMixin:
    """软删除混入类"""

    __allow_unmapped__ = True

    is_deleted: Mapped[bool] = mapped_column(Boolean, default=False, nullable=False)
    deleted_at: Mapped[Optional[datetime]] = mapped_column(DateTime, nullable=True)


class AuditMixin:
    """审计字段混入类"""

    __allow_unmapped__ = True

    created_by: Mapped[Optional[int]] = mapped_column(Integer, nullable=True)
    updated_by: Mapped[Optional[int]] = mapped_column(Integer, nullable=True)