from __future__ import annotations

import uuid
from datetime import datetime

from sqlalchemy import DateTime, ForeignKey, Text, func
from sqlalchemy.dialects.postgresql import UUID
from sqlalchemy.orm import Mapped, mapped_column

from . import Base


class DeviceToken(Base):
    """A long-lived bearer token a native client (Tauri/Android) uses to authenticate
    sync. Only the token's SHA-256 hash is stored; the plaintext is shown once at
    creation. Owner-scoped and individually revocable."""

    __tablename__ = "device_tokens"

    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    user_id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True), ForeignKey("users.id", ondelete="CASCADE"), nullable=False
    )
    token_hash: Mapped[str] = mapped_column(Text(), nullable=False, unique=True)
    name: Mapped[str] = mapped_column(Text(), nullable=False, server_default="")
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False, server_default=func.now())
    last_used_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)