"""育种审计日志 数据模型（§3.10；写操作全程可追溯切面）"""

from sqlalchemy import ForeignKey, Integer, String
from sqlalchemy.orm import Mapped, mapped_column

from app.core.base_model import MappedBase, ModelMixin, UserMixin


class AuditLogModel(ModelMixin, UserMixin, MappedBase):
    """审计日志。

    entity_type=业务表名（__tablename__）；CREATE 记录级 / UPDATE 字段级（每变更字段一行）/
    DELETE 记录级 / IMPORT 汇总级。operator_id→bre_personnel 仅当育种人员姓名与操作用户名
    一致时填充（默认只填 created_id→sys_user）。
    """

    __tablename__ = "bre_audit_log"
    __table_args__ = ()  # 表无 status 列，不生成 ModelMixin 的 status 索引

    entity_type: Mapped[str | None] = mapped_column(
        String(32), index=True, nullable=True, comment="实体类型(业务表名)", default=None
    )
    entity_id: Mapped[int | None] = mapped_column(
        Integer, index=True, nullable=True, comment="实体ID", default=None
    )
    action: Mapped[str | None] = mapped_column(
        String(32), index=True, nullable=True, comment="操作类型(CREATE/UPDATE/DELETE/IMPORT)", default=None
    )
    field_name: Mapped[str | None] = mapped_column(
        String(64), nullable=True, comment="变更字段名(UPDATE 字段级)", default=None
    )
    old_value: Mapped[str | None] = mapped_column(
        String(512), nullable=True, comment="旧值", default=None
    )
    new_value: Mapped[str | None] = mapped_column(
        String(512), nullable=True, comment="新值", default=None
    )
    operator_id: Mapped[int | None] = mapped_column(
        Integer,
        ForeignKey("bre_personnel.id", ondelete="CASCADE"),
        nullable=True,
        comment="操作人(育种人员，命中 personnel.name==username 才填)",
        default=None,
    )