"""User 用户模型。"""

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

from app.models.base import Base, TimestampMixin, UUIDPrimaryKeyMixin


class User(UUIDPrimaryKeyMixin, TimestampMixin, Base):
    """用户模型。

    技术审查 §2.2：users 表。
    """

    __tablename__ = "users"

    username: Mapped[str] = mapped_column(
        String(64),
        unique=True,
        nullable=False,
        index=True,
        comment="用户名",
    )
    email: Mapped[str] = mapped_column(
        String(255),
        unique=True,
        nullable=False,
        index=True,
        comment="邮箱",
    )
    password_hash: Mapped[str] = mapped_column(
        String(255),
        nullable=False,
        comment="Argon2id 密码哈希",
    )
    status: Mapped[str] = mapped_column(
        String(16),
        default="active",
        nullable=False,
        comment="状态 (active/disabled)",
    )
    plan_id: Mapped[str] = mapped_column(
        String(32),
        ForeignKey("plans.id"),
        nullable=False,
        comment="套餐 ID",
    )
    storage_used: Mapped[int] = mapped_column(
        Integer,
        default=0,
        nullable=False,
        comment="已用存储 (字节)",
    )

    # 关系
    plan = relationship("Plan", back_populates="users", lazy="selectin")
    knowledge_bases = relationship("KnowledgeBase", back_populates="user", lazy="selectin")
    documents = relationship("Document", back_populates="user", lazy="selectin")

    def __repr__(self) -> str:
        return f"<User {self.username!r}>"