from typing import TYPE_CHECKING

from sqlalchemy import JSON, Boolean, 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


class MenuModel(ModelMixin):
    """
    菜单表 - 用于存储系统菜单信息

    菜单类型说明:
    - 1: 目录(一级菜单)
    - 2: 菜单(二级菜单)
    - 3: 按钮/权限(页面内按钮权限)
    - 4: 外部链接
    """

    __tablename__: str = "sys_menu"
    __table_args__: dict[str, str] = {"comment": "菜单表"}
    __loader_options__: list[str] = ["roles"]
    __permission_strategy__: PermissionFilterStrategy = PermissionFilterStrategy.ROLE_BASED

    name: Mapped[str] = mapped_column(String(50), nullable=False, comment="菜单名称")
    type: Mapped[int] = mapped_column(
        Integer,
        nullable=False,
        default=2,
        comment="菜单类型(1:目录 2:菜单 3:按钮/权限 4:链接)",
    )
    order: Mapped[int] = mapped_column(Integer, nullable=False, default=999, comment="显示排序")
    permission: Mapped[str | None] = mapped_column(
        String(100), comment="权限标识(如:module_system:user:query)"
    )
    icon: Mapped[str | None] = mapped_column(String(50), comment="菜单图标")
    route_name: Mapped[str | None] = mapped_column(String(100), comment="路由名称")
    route_path: Mapped[str | None] = mapped_column(String(200), comment="路由路径")
    component_path: Mapped[str | None] = mapped_column(String(200), comment="组件路径")
    redirect: Mapped[str | None] = mapped_column(String(200), comment="重定向地址")
    hidden: Mapped[bool] = mapped_column(
        Boolean,
        default=False,
        nullable=False,
        comment="是否隐藏(True:隐藏 False:显示)",
    )
    keep_alive: Mapped[bool] = mapped_column(
        Boolean,
        default=True,
        nullable=False,
        comment="是否缓存(True:是 False:否)",
    )
    always_show: Mapped[bool] = mapped_column(
        Boolean,
        default=False,
        nullable=False,
        comment="是否始终显示(True:是 False:否)",
    )
    title: Mapped[str | None] = mapped_column(String(50), comment="菜单标题")
    params: Mapped[list[dict[str, str]] | None] = mapped_column(JSON, comment="路由参数(JSON对象)")
    affix: Mapped[bool] = mapped_column(
        Boolean,
        default=False,
        nullable=False,
        comment="是否固定标签页(True:是 False:否)",
    )

    # 树形结构
    parent_id: Mapped[int | None] = mapped_column(
        Integer,
        ForeignKey("sys_menu.id", ondelete="SET NULL"),
        default=None,
        index=True,
        comment="父菜单ID",
    )

    # 关联关系
    parent: Mapped["MenuModel | None"] = relationship(
        back_populates="children",
        remote_side="MenuModel.id",
        foreign_keys="MenuModel.parent_id",
        uselist=False,
    )
    children: Mapped[list["MenuModel"] | None] = relationship(
        back_populates="parent",
        foreign_keys="MenuModel.parent_id",
        order_by="MenuModel.order",
    )
    roles: Mapped[list["RoleModel"]] = relationship(
        secondary="sys_role_menus", back_populates="menus", lazy="selectin"
    )