from __future__ import annotations
from datetime import datetime
from sqlalchemy import String, Integer, DateTime, ForeignKey, func, Index
from sqlalchemy.orm import Mapped, mapped_column, relationship
from shared.db.base import Base

class MagicLink(Base):
    __tablename__ = "magic_links"

    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
    token: Mapped[str] = mapped_column(String(128), unique=True, index=True, nullable=False)
    user_id: Mapped[int] = mapped_column(ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True)
    purpose: Mapped[str] = mapped_column(String(32), nullable=False, default="signin")
    expires_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False)
    used_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False, server_default=func.now())
    ip: Mapped[str | None] = mapped_column(String(64), nullable=True)
    user_agent: Mapped[str | None] = mapped_column(String(256), nullable=True)

    user = relationship("User", backref="magic_links")

    __table_args__ = (
        Index("ix_magic_link_token", "token", unique=True),
        Index("ix_magic_link_user", "user_id"),
    )
