from __future__ import annotations

from datetime import datetime
from typing import TYPE_CHECKING

from sqlalchemy import VARBINARY, Boolean, ForeignKey, String
from sqlalchemy.dialects.postgresql import BYTEA, INTEGER
from sqlalchemy.orm import Mapped, mapped_column, relationship

from backend.app.admin.model.m2m import sys_user_role
from backend.common.model import Base, TimeZone, id_key
from backend.database.db import uuid4_str
from backend.utils.timezone import timezone

if TYPE_CHECKING:
    from backend.app.admin.model import Dept, Role


class User(Base):
    """用户表"""

    __tablename__ = 'sys_user'

    id: Mapped[id_key] = mapped_column(init=False)
    uuid: Mapped[str] = mapped_column(String(50), init=False, default_factory=uuid4_str, unique=True)
    username: Mapped[str] = mapped_column(String(20), unique=True, index=True, comment='用户名')
    nickname: Mapped[str] = mapped_column(String(20), comment='昵称')
    password: Mapped[str | None] = mapped_column(String(255), comment='密码')
    salt: Mapped[bytes | None] = mapped_column(VARBINARY(255).with_variant(BYTEA(255), 'postgresql'), comment='加密盐')
    email: Mapped[str | None] = mapped_column(String(50), default=None, unique=True, index=True, comment='邮箱')
    phone: Mapped[str | None] = mapped_column(String(11), default=None, comment='手机号')
    avatar: Mapped[str | None] = mapped_column(String(255), default=None, comment='头像')
    status: Mapped[int] = mapped_column(default=1, index=True, comment='用户账号状态(0停用 1正常)')
    is_superuser: Mapped[bool] = mapped_column(
        Boolean().with_variant(INTEGER, 'postgresql'),
        default=False,
        comment='超级权限(0否 1是)',
    )
    is_staff: Mapped[bool] = mapped_column(
        Boolean().with_variant(INTEGER, 'postgresql'),
        default=False,
        comment='后台管理登陆(0否 1是)',
    )
    is_multi_login: Mapped[bool] = mapped_column(
        Boolean().with_variant(INTEGER, 'postgresql'),
        default=False,
        comment='是否重复登陆(0否 1是)',
    )
    join_time: Mapped[datetime] = mapped_column(TimeZone, init=False, default_factory=timezone.now, comment='注册时间')
    last_login_time: Mapped[datetime | None] = mapped_column(
        TimeZone,
        init=False,
        onupdate=timezone.now,
        comment='上次登录',
    )

    # 部门用户一对多
    dept_id: Mapped[int | None] = mapped_column(
        ForeignKey('sys_dept.id', ondelete='SET NULL'),
        default=None,
        comment='部门关联ID',
    )
    dept: Mapped[Dept | None] = relationship(init=False, back_populates='users')

    # 用户角色多对多
    roles: Mapped[list[Role]] = relationship(init=False, secondary=sys_user_role, back_populates='users')