"""用户权限 ORM 模型 - User / Session"""

from datetime import datetime

from sqlalchemy import Boolean, DateTime, Integer, String
from sqlalchemy.orm import Mapped, mapped_column

from app.database import Base


class User(Base):
    """用户表。"""

    __tablename__ = "users"

    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
    username: Mapped[str] = mapped_column(String(50), unique=True, nullable=False, index=True)
    password_hash: Mapped[str] = mapped_column(String(255), nullable=False)
    email: Mapped[str | None] = mapped_column(String(100), unique=True, nullable=True)
    role: Mapped[str] = mapped_column(String(20), nullable=False, default="user")
    is_active: Mapped[bool] = mapped_column(Boolean, default=True)
    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)
    last_login: Mapped[datetime | None] = mapped_column(DateTime, nullable=True)

    def __repr__(self) -> str:
        return f"<User(id={self.id}, username='{self.username}', role='{self.role}')>"


class Session(Base):
    """用户会话表。"""

    __tablename__ = "sessions"

    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
    user_id: Mapped[int] = mapped_column(Integer, nullable=False, index=True)
    token: Mapped[str] = mapped_column(String(255), unique=True, nullable=False, index=True)
    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)
    expires_at: Mapped[datetime] = mapped_column(DateTime, nullable=False)
    is_valid: Mapped[bool] = mapped_column(Boolean, default=True)

    def __repr__(self) -> str:
        return f"<Session(id={self.id}, user_id={self.user_id})>"