from typing import TYPE_CHECKING

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

from app.common.enums import PermissionFilterStrategy
from app.core.base_model import ModelMixin

if TYPE_CHECKING:
    from app.api.v1.module_system.role.model import RoleModel
    from app.api.v1.module_system.user.model import UserModel


class DeptModel(ModelMixin):
    """
    部门模型
    """

    __tablename__: str = "sys_dept"
    __table_args__: dict[str, str] = {"comment": "部门表"}
    __loader_options__: list[str] = []
    __permission_strategy__: PermissionFilterStrategy = PermissionFilterStrategy.DEPT_BASED

    name: Mapped[str] = mapped_column(String(64), nullable=False, comment="部门名称")
    order: Mapped[int] = mapped_column(Integer, nullable=False, default=999, comment="显示排序")
    code: Mapped[str] = mapped_column(
        String(16), nullable=False, unique=True, comment="部门编码"
    )
    leader: Mapped[str | None] = mapped_column(String(32), default=None, comment="部门负责人")
    phone: Mapped[str | None] = mapped_column(String(11), default=None, comment="手机")
    email: Mapped[str | None] = mapped_column(String(64), default=None, comment="邮箱")

    # 树形结构字段
    parent_id: Mapped[int | None] = mapped_column(
        Integer,
        ForeignKey("sys_dept.id", ondelete="SET NULL", onupdate="CASCADE"),
        default=None,
        index=True,
        comment="父级部门ID",
    )
    # 关联关系
    parent: Mapped["DeptModel | None"] = relationship(
        back_populates="children",
        remote_side="DeptModel.id",
        foreign_keys=[parent_id],
        uselist=False,
    )
    children: Mapped[list["DeptModel"]] = relationship(
        back_populates="parent", foreign_keys=[parent_id], lazy="selectin"
    )
    roles: Mapped[list["RoleModel"]] = relationship(
        secondary="sys_role_depts", back_populates="depts", lazy="selectin"
    )
    users: Mapped[list["UserModel"]] = relationship(
        back_populates="dept",
        foreign_keys="UserModel.dept_id",
        lazy="selectin",
    )