from __future__ import annotations

import uuid
from datetime import datetime

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

from . import Base


class NoteRevision(Base):
    """A point-in-time snapshot of a note's title+body, written on each edit that
    changes either — so an accidental overwrite can be viewed and restored. Only
    title+body are versioned in v1 (not items/attachments/labels)."""

    __tablename__ = "note_revisions"
    __table_args__ = (Index("ix_note_revisions_note_created", "note_id", "created_at"),)

    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    note_id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True), ForeignKey("notes.id", ondelete="CASCADE"), nullable=False
    )
    title: Mapped[str | None] = mapped_column(Text(), nullable=True)
    body: Mapped[str] = mapped_column(Text(), nullable=False, server_default="")
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False, server_default=func.now())