"""自定义业务角色模型：角色、权限矩阵。

内置 ADMIN/USER 之外的第三层授权体系：
- Role 本体（含全局唯一默认角色标记）；
- RolePermission 权限矩阵（密级 × 部门范围 × 7 操作，每角色固定 10 行）。
"""

from __future__ import annotations

from sqlalchemy import (
    BigInteger,
    Boolean,
    CheckConstraint,
    Computed,
    ForeignKey,
    Index,
    Integer,
    String,
    UniqueConstraint,
    text,
)
from sqlalchemy.orm import Mapped, mapped_column

from dms.database.base import BusinessTableMixin
from dms.extensions import db


class Role(BusinessTableMixin, db.Model):
    __tablename__ = "sys_role"
    __table_args__ = (
        CheckConstraint(
            "status IN ('ENABLED', 'DISABLED')",
            name="role_status",
        ),
        # 活跃行角色名唯一：软删后可重建同名角色
        UniqueConstraint(
            "role_name",
            "active_marker",
            name="uq_sys_role_role_name_active",
        ),
        # 全局至多一个默认角色：default_marker 虚拟生成列（非默认/已软删 → NULL）
        UniqueConstraint(
            "default_marker",
            name="uq_sys_role_default_active",
        ),
        Index(
            "ix_sys_role_status_active",
            "status",
            "is_deleted",
        ),
    )

    role_name: Mapped[str] = mapped_column(String(64), nullable=False)
    sort_no: Mapped[int] = mapped_column(
        Integer,
        nullable=False,
        server_default=text("0"),
    )
    status: Mapped[str] = mapped_column(
        String(20),
        nullable=False,
        server_default=text("'ENABLED'"),
    )
    remark: Mapped[str | None] = mapped_column(String(255), nullable=True)
    is_default: Mapped[bool] = mapped_column(
        Boolean,
        nullable=False,
        server_default=text("0"),
    )
    active_marker: Mapped[int | None] = mapped_column(
        Integer,
        Computed("IF(is_deleted = 0, 1, NULL)", persisted=False),
        nullable=True,
    )
    default_marker: Mapped[int | None] = mapped_column(
        Integer,
        Computed(
            "IF(is_default = 1 AND is_deleted = 0, 1, NULL)",
            persisted=False,
        ),
        nullable=True,
    )


class RolePermission(BusinessTableMixin, db.Model):
    """角色权限矩阵行：密级 × 部门范围 → 7 个操作布尔位。

    每角色固定 10 行（5 密级 × 2 部门范围），整存整取；
    与文档 ACL 为 OR 叠加，矩阵是主权限源。
    """

    __tablename__ = "sys_role_permission"
    __table_args__ = (
        CheckConstraint(
            "security_level IN "
            "('PUBLIC', 'INTERNAL', 'SECRET', 'CONFIDENTIAL', 'TOP_SECRET')",
            name="role_permission_security_level",
        ),
        CheckConstraint(
            "dept_scope IN ('OWN', 'OTHER')",
            name="dept_scope_v2",
        ),
        UniqueConstraint(
            "role_id",
            "security_level",
            "dept_scope",
            "active_marker",
            name="uq_sys_role_permission_active",
        ),
        Index(
            "ix_sys_role_permission_role_active",
            "role_id",
            "is_deleted",
        ),
    )

    role_id: Mapped[int] = mapped_column(
        BigInteger,
        ForeignKey("sys_role.id", ondelete="RESTRICT"),
        nullable=False,
    )
    security_level: Mapped[str] = mapped_column(String(32), nullable=False)
    dept_scope: Mapped[str] = mapped_column(String(32), nullable=False)
    can_view: Mapped[bool] = mapped_column(
        Boolean,
        nullable=False,
        server_default=text("0"),
    )
    can_download: Mapped[bool] = mapped_column(
        Boolean,
        nullable=False,
        server_default=text("0"),
    )
    can_edit: Mapped[bool] = mapped_column(
        Boolean,
        nullable=False,
        server_default=text("0"),
    )
    can_delete: Mapped[bool] = mapped_column(
        Boolean,
        nullable=False,
        server_default=text("0"),
    )
    can_config_permission: Mapped[bool] = mapped_column(
        Boolean,
        nullable=False,
        server_default=text("0"),
    )
    can_bind_attachment: Mapped[bool] = mapped_column(
        Boolean,
        nullable=False,
        server_default=text("0"),
    )
    can_unbind_attachment: Mapped[bool] = mapped_column(
        Boolean,
        nullable=False,
        server_default=text("0"),
    )
    active_marker: Mapped[int | None] = mapped_column(
        Integer,
        Computed("IF(is_deleted = 0, 1, NULL)", persisted=False),
        nullable=True,
    )